1
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
SP3070E - SP3078E Family
15kV ESD-Protected, 3.3V, 1/8 Load, Failsafe
RS-485/RS422 Transceivers
DESCRIPTION
FEATURES
15kV ESD protection for RS485 pins
3.3V low-power operation
Advanced receiver-failsafe protection for
open, shorted or terminated lines
Up to 256 Transceivers may share bus
Very low load for 8x greater fanout
Hot Swap glitch protection RE and DE
Thermal shutdown protects against driver
contention
Available in three industry standard foot-
prints
SP3070E, SP3073E and SP3076E in Full-Duplex (14 pin)
SP3071E, SP3074E and SP3077E in Full-Duplex (8 pin)
SP3072E, SP3075E and SP3078E in Half-Duplex (8 pin)
Three applications-optimized speed grades
SP3070-72E: 250kbps fully slew-limited
SP3073-75E: 500kbps slew-limited
SP3076-78E: 16Mbps high speed
Small form factor SO-narrow packages
Industrial (-40 to +85C) and Extended
(-40 to +
125C) temperature grades
Now Available in Lead Free Packaging
1
2
3
4
5
6
7
8
8 PIN NSOIC
SP3071E
SP3074E
SP3077E
Full Duplex
B
R
O
A
DI
I
GND
Z
Y
V
CC
NC
RO
RE
DE
DI
GND
14 Pin NSOIC
SP3070E
SP3073E
SP3076E
Full Duplex
V
CC
NC
A
B
Z
Y
1
2
3
4
5
6
14
13
12
11
10
9
NC
GND 7
8
APPLICATIONS
Industrial Control, Utility Meters Building Automation, Instrumentation, Point of Sale
The SP3070-3078E differential line transceivers are suitable for bidirectional communication
on balanced multipoint bus transmission lines and comply with both RS485 and RS422 EIA
Standards. Each device consists of a differential driver and differential receiver. All devices
operate from a 3.3V power supply.
High receiver input impedance allows a large number of transceivers to share a common data
bus while maintaining signal margin and without excessive loading or use of expensive
repeaters. The high impedance driver output is maintained over the entire common-mode
voltage range from -7 to +12V. Receivers will failsafe to logic 1 output when inputs are open,
shorted or terminated. Drivers include built-in short-circuit protection and a thermal-overload
shutdown to protect against excessive power dissipation from bus contention or cable faults.
All RS485 inputs are ESD protected up to 15kV (Air-Gap and Human Body Model) and up
to 8kV Contact discharge (IEC 1000-4-2).
1
2
3
4
5
6
7
8
8 PIN NSOIC
SP3072E
SP3075E
SP3078E
Half Duplex
B
RO
A
GND
V
CC
DE
DI
RE
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
2
DEVICE ARCHITECTURE AND BLOCK DIAGRAMS
V
CC
D
R
NC
A
B
Z
Y
R
NC
NC
DE
RE
GND
GND
2
1
3
4
5
6
7
8
9
10
11
12
13
14
D
D
R
A
B
Z
Y
R
GND
2
1
3
4
5
6
7
8
D
V
CC
D
R
A
B
RO
GND
2
1
3
4
5
6
7
8
DE
V
CC
RE
DI
14 Pin Full Duplex:
SP3070E, 250kbps slew limited
SP3073E, 500kbps slew limited
SP3076E, 16Mbps
8 Pin Full Duplex:
SP3071E, 250kbps slew limited
SP3074E, 500kbps slew limited
SP3077E, 16Mbps
8 Pin Half Duplex:
SP3072E, 250kbps slew limited
SP3075E, 500kbps slew limited
SP3078E, 16Mbps
Devices are available in three industry standard architectures and footprints. In each footprint
there are three speed grades available.
3
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
These are stress ratings only and functional operation of the device at
these ratings or any other above those indicated in the operation sections
of the specifications below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect reliability.
V
CC
.....................................................................................................+6.0V
Input Voltage at control input pins (RE, DE).........................-0.3V to 6V
Driver Input Voltage (RE, DE)...............................................-0.3V to 6V
Driver Output Voltage (A, B, Y, & Z)....................................-8V to +13V
Receiver Input Voltage (A, B)..............................................-8V to +13V
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Unless otherwise noted V
CC
= +3.3 0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25C. The denotes the specifications which apply over the full operating range
unless otherwise noted.
Continuous Power Dissipation at Ta = 70
o
C
8-pin SO (derate 5.88mW/
o
C above +70
o
C)................................471mW
8-pin PDIP (derate 9.29mW/
o
C above +70
o
C)............................727mW
14-pin SO (derate 8.33mW/
o
C above +70
o
C).............. .............667mW
14-pin PDIP (derate 10mW/
o
C above +70
o
C).................. ..........800mW
Operating Temperature Ranges
SP307_EMN.................................................................-40C to +125C
SP307_EEN ...............................................................-40C to +85C
Junction Temperature............................................................. ..+150C
Storage Temperature Range..........................................-65C to +150 C
Lead Temperature (soldering, 10s) ........................................... +300 C
R
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T
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0
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
4
ELECTRICAL CHARACTERISTICS
Unless otherwise noted V
CC
= +3.3 0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25C. The denotes the specifications which apply over the full operating range
unless otherwise noted.
S
R
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T
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M
A
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f
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5
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D
N
G
=
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V
C
C
6
.
3
r
o
D
N
G
=
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N
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V
2
1
+
=
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1
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N
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5
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
RECEIVER SWITCHING CHARACTERISTICS
DRIVER SWITCHING CHARACTERISTICS
S
C
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T
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T
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A
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Unless otherwise noted V
CC
= +3.3 0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25C.
Unless otherwise noted V
CC
= +3.3 0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25C.
2
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Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
6
RECEIVER SWITCHING CHARACTERISTICS
DRIVER SWITCHING CHARACTERISTICS
Unless otherwise noted V
CC
= +3.3 0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25C.
Unless otherwise noted V
CC
= +3.3 0.3V, ambient temperature T
MIN
< T
A
< T
MAX
. Typical values are at V
CC
= 3.3,
ambient temperature T
A
= +25C.
5
7
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3
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&
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7
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
DRIVER SWITCHING CHARACTERISTICS
Unless otherwise noted Vcc=+3.30.3V, ambient temperature Tmin < Ta < Tmax. Typical values are at Vcc = 3.3,
ambient temperature Ta = +25C
RECEIVER SWITCHING CHARACTERISTICS
Unless otherwise noted Vcc=+3.30.3V, ambient temperature Tmin < Ta < Tmax. Typical values are at Vcc = 3.3,
ambient temperature Ta = +25C
S
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R
E
T
E
M
A
R
A
P
L
O
B
M
Y
S
.
N
I
M
.
P
Y
T
.
X
A
M
S
T
I
N
U
S
N
O
I
T
I
D
N
O
C
y
a
l
e
D
n
o
i
t
a
g
a
p
o
r
P
r
e
v
i
e
c
e
R
t
H
L
P
R
-
0
4
5
7
s
n
C
L
,
7
&
6
e
r
u
g
i
F
,
F
p
5
1
=
C
5
8
+
o
t
0
4
-
t
L
H
P
R
-
0
4
5
7
s
n
t
(
w
e
k
S
t
u
p
t
u
O
r
e
v
i
e
c
e
R
H
L
P
D
t
-
L
H
P
D
)
t
W
E
K
S
R
-
-
8
s
n
C
L
,
7
&
6
e
r
u
g
i
F
,
F
p
5
1
=
e
t
a
R
a
t
a
D
6
1
-
-
s
p
b
M
h
g
i
H
t
u
p
t
u
O
o
t
e
l
b
a
n
E
r
e
v
i
e
c
e
R
t
H
Z
R
-
-
0
6
s
n
C
5
8
+
o
t
0
4
-
,
8
e
r
u
g
i
F
w
o
L
t
u
p
t
u
O
o
t
e
l
b
a
n
E
r
e
v
i
e
c
e
R
t
L
Z
R
-
-
0
6
s
n
C
5
8
+
o
t
0
4
-
,
8
e
r
u
g
i
F
w
o
L
m
o
r
f
e
m
i
T
e
l
b
a
s
i
D
r
e
v
i
e
c
e
R
t
Z
L
R
-
-
0
5
s
n
8
e
r
u
g
i
F
h
g
i
H
m
o
r
f
e
m
i
T
e
l
b
a
s
i
D
r
e
v
i
e
c
e
R
t
Z
H
R
-
-
0
5
s
n
8
e
r
u
g
i
F
o
t
n
w
o
d
t
u
h
S
m
o
r
f
e
l
b
a
n
E
r
e
v
i
e
c
e
R
h
g
i
H
t
u
p
t
u
O
t
)
N
D
H
S
(
H
Z
R
-
-
0
0
8
1
s
n
8
e
r
u
g
i
F
o
t
n
w
o
d
t
u
h
S
m
o
r
f
e
l
b
a
n
E
r
e
v
i
e
c
e
R
w
o
L
t
u
p
t
u
O
t
)
N
D
H
S
(
L
Z
R
-
-
0
0
8
1
s
n
8
e
r
u
g
i
F
n
w
o
d
t
u
h
S
o
t
e
m
i
T
t
N
D
H
S
0
5
0
0
2
0
0
6
s
n
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
8
Y
Z
D
DI
R
L
54
C
L
50pF
3.3V
V
OD
FIGURE 3. DRIVER PROPAGATION DELAY TIME TEST CIRCUIT AND TIMING
DIAGRAM
FIGURE 1. DRIVER DC TEST CIRCUIT
FIGURE 2. RECEIVER DC TEST CIRCUIT
t
PHL
t
PLH
Z
Y
10%
90%
10%
90%
V
SKEW
= t
PLH -
t
PHL
V
DIFF
= V(Y) - V(Z)
V
O
V
CC
V
CC
/2
0
DI
V
DIFF
-V
O
1/2 V
O
t
R
t
F
V
O
1/2 V
O
OUT
R
A
B
V
ID
RE
R/2
R/2
V
OC
D
V
CC
V
OD
D
I
0 or 3V
9
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
FIGURE 4. DRIVER ENABLE & DISABLE TIMES TEST CIRCUIT & TIMING DIAGRAM
GENERATOR
50
S1
R
L
= 500
OUT
C
L
= 50pF
D
0 or V
CC
Z
Y
DI
DE
t
LZ
0.25V
OUT
V
CC
V
OM
= (V
OL
+ V
CC
)/2
t
ZL,
t
ZL(SHDN
V
CC
/2
0
0
A/Y
D
DI = 0 or 3V
B/Z
DE = 0 or 3V
I
OSD
100
-7V to +12V
V
FIGURE 4A. DRIVER CONTENTION TEST
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
10
FIGURE 6. RECEIVER PROPAGATION DELAY TEST CIRCUIT & TIMING DIAGRAM
FIGURE 5. DRIVER ENABLE & DISABLE TIMES TEST CIRCUIT & TIMING DIAGRAM
DE
V
OL
t
LZ
0.25V
V
CC
OUT
V
CC
V
OM
= (V
OL
+ V
CC
)/2
t
ZL,
t
ZL(SHDN
V
CC
/2
0
OUT
R
A
B
V
ID
RE
C
L
15pF
t
PHL
t
PLH
V
OL
1.5V
OUT
V
OH
A
B
+1V
-1V
GENERATOR
50
S1
R
L
= 500
OUT
C
L
= 50pF
D
0 or V
CC
Z
Y
DI
V
CC
11
Date: 03
/31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
FIGURE 8. RECEIVER ENABLE & DISABLE TIMING DIAGRAM
FIGURE 7. RECEIVER ENABLE & DISABLE TIMES TEST CIRCUIT
1.5V
-1.5V
S3
A
GENERATOR
50
C
L
= 15pF
R
1k
S1
S2
V
CC
B
RE
3V
0V
1.5V
V
CC
RE
OUT
S1 is closed, S2 is open, S3 = -1.5V
t
ZL,
t
ZL(SHDN)
V
OL
= V
CC
/2
V
OL
3V
0V
1.5V
V
CC
RE
OUT
S1 is closed, S2 is open, S3 = -1.5V
t
LZ
V
OL
0.25V
3V
1.5V
0V
RE
OUT
S1 is open S2 is closed S3 = 1.5V
V
OH
t
HZ
0.25V
3V
1.5V
0V
RE
OUT
S1 is open S2 is closed S3 = 1.5V
V
OH
t
ZH,
t
ZH(SHDN)
V
OH
/2
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
12
FUNCTION TABLES
)
x
e
l
p
u
D
l
l
u
F
(
E
6
7
0
3
P
S
,
E
3
7
0
3
P
S
,
E
0
7
0
3
P
S
G
N
I
T
T
I
M
S
N
A
R
T
s
t
u
p
n
I
s
t
u
p
t
u
O
E
R
E
D
I
D
Z
Y
X
1
1
0
1
X
1
0
1
0
0
0
X
Z
-
h
g
i
H
1
0
X
n
w
o
d
t
u
h
S
)
x
e
l
p
u
D
l
l
u
F
(
E
6
7
0
3
P
S
,
E
3
7
0
3
P
S
,
E
0
7
0
3
P
S
G
N
I
V
I
E
C
E
R
s
t
u
p
n
I
t
u
p
t
u
O
E
R
E
D
B
,
A
O
R
0
X
V
m
0
5
-
1
0
X
V
m
0
0
2
-
0
0
X
,
n
e
p
O
d
e
t
r
o
h
S
1
1
1
X
Z
-
h
g
i
H
1
0
X
n
w
o
d
t
u
h
S
)
x
e
l
p
u
D
f
l
a
H
(
E
8
7
0
3
P
S
,
E
5
7
0
3
P
S
,
E
2
7
0
3
P
S
G
N
I
T
T
I
M
S
N
A
R
T
s
t
u
p
n
I
s
t
u
p
t
u
O
E
R
E
D
I
D
Z
/
B
Y
/
A
X
1
1
0
1
X
1
0
1
0
0
0
X
Z
-
h
g
i
H
1
0
X
n
w
o
d
t
u
h
S
)
x
e
l
p
u
D
f
l
a
H
(
E
8
7
0
3
P
S
,
E
5
7
0
3
P
S
,
E
2
7
0
3
P
S
G
N
I
V
I
E
C
E
R
s
t
u
p
n
I
t
u
p
t
u
O
E
R
E
D
B
,
A
O
R
0
X
V
m
0
5
-
1
0
X
V
m
0
0
2
-
0
0
X
d
e
t
r
o
h
s
/
n
e
p
O
1
1
1
X
Z
-
h
g
i
H
1
0
X
n
w
o
d
t
u
h
S
)
x
e
l
p
u
D
l
l
u
F
(
E
7
7
0
3
P
S
,
E
4
7
0
3
P
S
,
E
1
7
0
3
P
S
G
N
I
T
T
I
M
S
N
A
R
T
s
t
u
p
n
I
s
t
u
p
t
u
O
I
D
Z
Y
1
0
1
0
1
0
)
x
e
l
p
u
D
l
l
u
F
(
E
7
7
0
3
P
S
,
E
4
7
0
3
P
S
,
E
1
7
0
3
P
S
G
N
I
V
I
E
C
E
R
s
t
u
p
n
I
t
u
p
t
u
O
B
,
A
O
R
V
m
0
5
-
1
V
m
0
0
2
-
0
d
e
t
r
o
h
s
/
n
e
p
O
1
13
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
PIN DESCRIPTION
X
E
L
P
U
D
L
L
U
F
S
E
C
I
V
E
D
F
L
A
H
X
E
L
P
U
D
S
E
C
I
V
E
D
N
I
P
E
M
A
N
N
O
I
T
C
N
U
F
N
I
P
E
0
7
0
3
P
S
E
1
7
0
3
P
S
E
2
7
0
3
P
S
E
3
7
0
3
P
S
E
4
7
0
3
P
S
E
5
7
0
3
P
S
E
6
7
0
3
P
S
E
7
7
0
3
P
S
E
8
7
0
3
P
S
R
E
B
M
U
N
N
I
P
2
2
1
O
R
)
B
A
(
f
i
d
n
a
w
o
l
s
i
E
R
n
e
h
W
.
t
u
p
t
u
O
r
e
v
i
e
c
e
R
.
w
o
l
s
i
O
R
,
V
m
0
0
2
-
)
B
A
(
f
I
.
h
g
i
H
s
i
O
R
,
V
m
0
5
-
3
-
2
E
R
.
d
e
l
b
a
n
e
s
i
O
R
,
w
o
l
s
i
E
R
n
e
h
W
.
e
l
b
a
n
E
t
u
p
t
u
O
r
e
v
i
e
c
e
R
e
b
d
l
u
o
h
s
E
R
.
e
c
n
a
d
e
p
m
i
h
g
i
h
s
i
O
R
,
h
g
i
h
s
i
E
R
n
e
h
W
-
t
o
h
a
s
i
E
R
.
e
d
o
m
n
w
o
d
t
u
h
s
r
e
t
n
e
o
t
w
o
l
E
D
d
n
a
h
g
i
h
.
t
u
p
n
i
p
a
w
s
4
-
3
E
D
e
r
a
s
t
u
p
t
u
o
,
h
g
i
h
s
i
E
D
n
e
h
W
.
e
l
b
a
n
E
t
u
p
t
u
O
r
e
v
i
r
D
E
D
.
e
c
n
a
d
e
p
m
i
h
g
i
h
e
r
a
s
t
u
p
t
u
o
,
w
o
l
s
i
E
D
n
e
h
W
.
d
e
l
b
a
n
e
s
i
E
D
.
e
d
o
m
n
w
o
d
t
u
h
s
r
e
t
n
e
o
t
h
g
i
h
E
R
d
n
a
w
o
l
e
b
d
l
u
o
h
s
.
t
u
p
n
i
p
a
w
s
-
t
o
h
a
5
3
4
I
D
s
e
c
r
o
f
I
D
n
o
l
e
v
e
l
w
o
l
a
,
h
g
i
h
E
D
h
t
i
W
.
t
u
p
n
I
r
e
v
i
r
D
,
y
l
r
a
li
m
i
S
.
h
g
i
h
t
u
p
t
u
o
g
n
i
t
r
e
v
n
i
d
n
a
w
o
l
t
u
p
t
u
o
g
n
i
t
r
e
v
n
i
n
o
n
d
n
a
h
g
i
h
t
u
p
t
u
o
g
n
i
t
r
e
v
n
i
n
o
n
s
e
c
r
o
f
I
D
n
o
l
e
v
e
l
h
g
i
h
a
.
w
o
l
t
u
p
t
u
o
g
n
i
t
r
e
v
n
i
7
,
6
4
5
D
N
G
d
n
u
o
r
G
9
5
-
Y
t
u
p
t
u
O
r
e
v
i
r
D
g
n
i
t
r
e
v
n
i
n
o
N
0
1
6
-
Z
t
u
p
t
u
O
r
e
v
i
r
D
g
n
i
t
r
e
v
n
I
1
1
7
-
B
t
u
p
n
I
r
e
v
i
e
c
e
R
g
n
i
t
r
e
v
n
I
-
-
7
B
t
u
p
t
u
O
r
e
v
i
r
D
g
n
i
t
r
e
v
n
I
d
n
a
t
u
p
n
I
r
e
v
i
e
c
e
R
g
n
i
t
r
e
v
n
I
2
1
8
-
A
t
u
p
n
I
r
e
v
i
e
c
e
R
g
n
i
t
r
e
v
n
i
n
o
N
-
-
6
A
r
e
v
i
r
D
g
n
i
t
r
e
v
n
i
n
o
N
d
n
a
t
u
p
n
I
r
e
v
i
e
c
e
R
g
n
i
t
r
e
v
n
i
n
o
N
t
u
p
t
u
O
4
1
1
8
V
C
C
y
l
p
p
u
S
e
v
i
t
i
s
o
P
V
C
C
s
s
a
p
y
B
.
V
C
C
F
u
1
.
0
a
h
t
i
w
D
N
G
o
t
.
r
o
t
i
c
a
p
a
c
3
1
,
8
,
1
-
-
C
N
t
c
e
n
n
o
C
o
N
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
14
DETAILED DESCRIPTION
The SP307XE family of high speed transceiv-
ers for RS-485/RS-422 communication con-
tain one driver and one receiver. These
devices feature fail-safe circuitry, which guar-
antees a logic-high receiver output when the
receiver inputs are open or shorted, or when
they are connected to a terminated transmis-
sion line with all drivers disabled. The
SP3070E, SP3072E, SP3073E, SP3075E,
SP3076E and SP3078E also feature a
hotswap capability allowing live insertion with-
out error data transfer. The SP3070E,
SP3071E and SP3072E feature reduced slew-
rate drivers that minimize EMI and reduce
reflections caused by improperly terminated
cables, allowing error-free data transmission
up to 250kbps. The SP3073E, SP3074E and
SP3075E also offer slew -rate limits allowing
transmit speeds up to 500kbps. The SP3076E,
SP3077E, SP3078E driver slew rates are not
limited, making transmit speeds up to 16Mbps
possible.
The SP3072E, SP3075E and SP3078E are
half-duplex transceivers, while the SP3070E,
SP3071E, SP3073E, SP3074E, SP3076E,
and SP3077E are full duplex transceivers.
All devices operate from a single 3.3V supply.
Drivers are output short-circuit current limited.
Thermal-shutdown circuitry protects drivers
against excessive power dissipation. When
activated, the thermal-shutdown circuitry
places the driver outputs into a high-imped-
ance state.
RECEIVER INPUT FILTERING
SP3070-SP3075 receivers incorporate input
filtering in addition to input hysteresis. This
filtering enhances noise immunity with differ-
ential signals that have very slow rise and fall
times. Receiver propagation delay increases
by 25% due to this filtering.
FAIL SAFE
The SP3070 family guarantees a logic-high
receiver output when the receiver inputs are
shorted, open, or when they are connected to
a terminated transmission line with all drivers
disabled. If A - B is less than or equal to -
200mV, RO is logic low. In the case of a
terminated bus with all transmitters disabled
the receiver's differential input voltage is pulled
to 0V by the termination. With the receiver
thresholds of the SP3070E family, this results
in a logic high with a 50mV minimum noise
margin. In compliance with the EIA/TIA-485
standard, the SP3070E family has a 50mV -
200mV threshold.
HOT-SWAP CAPABILITY
When circuit boards are inserted into a hot
backplane, differential disturbances to the
data bus can lead to data errors. Upon initial
circuit board insertion, the data communica-
tion processor undergoes its own power-up
sequence. During this period, the processor's
logic-output drivers are high impedance and
are unable to drive the DE and RE inputs of
these devices to a defined logic level. Leak-
age currents up to 10A from the high-imped-
ance state of the processor's logic drivers
could cause standard CMOS enable inputs of
a transceiver to drift to an incorrect logic level.
Additionally, parasitic circuit board capaci-
tance could cause coupling of VCC or GND to
the enable inputs. Without the hot-swap capa-
bility, these factors could improperly enable
the transceiver's driver or receiver.
When VCC rises, an internal pulldown circuit
holds DE low and RE high for approximately
10 microseconds. After the initial power-up
sequence, the pulldown circuit becomes trans-
parent, resetting the hot-swap tolerable input.
15KV ESD PROTECTION
As with all Sipex devices, ESD-protection
structures are incorporated on all pins to
protect against electrostatic discharges en-
countered during handling and assembly. The
driver output and receiver inputs of the
SP3070E family of devices have extra protec-
tion against static electricity. Sipex's engi-
neering team have developed state of the art
structures to protect these pins against ESD
of 15kV without damage. The ESD structures
withstand high ESD in all states: normal op-
DETAILED DESCRIPTION
15
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
eration, shutdown, and powered down. After
an ESD event, the SP3070E - SP3078E keep
working without latchup or damage.
ESD protection can be tested in various ways.
The transmitter outputs and receiver inputs of
the SP3070E - SP3078E are characterized
for protection to the following limits:
15kV using the Human Body Model
8kV using the Contact Discharge
method specified in IEC 1000-4-2
15kV Airgap
ESD TEST CONDITIONS
ESD performance depends on a variety of
conditions. Contact Sipex for a reliability
report that documents test setup, method-
ology and results.
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD
testing and performance of finished equip-
ment. However, it does not specifically refer
to integrated circuits. The SP3070E family
of devices helps you design equipment to
meet IEC 1000-4-2, without the need for
additional ESD-protection components.
The major difference between tests done
using the Human Body Model and IEC 1000-
4-2 is higher peak current in IEC 1000-4-2,
because series resistance is lower in the
IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to EC 1000-4-2 is
generally lower than that measured using
the human body model.
The air-gap test involves approaching the
device with a charged probe. The contact-
discharge method connects the probe to the
device before the probe is energized.
MACHINE MODEL
The machine model for ESD tests all pins
using a 200pF storage capacitor and zero
discharge resistance. The objective is to
emulate the stress caused when I/O pins are
contacted by handling equipment during test
and assembly.
DETAILED DESCRIPTION
256 TRANSCEIVERS ON THE BUS
The standard RS-485 receiver input imped-
ance is 12k (1 unit load), and the standard
driver can drive up to 32 unit loads. The
SP3070E family of transceivers has a 1/8
th
unit load receiver input impedance (96),
allowing up to 256 transceivers to be con-
nected in parallel on one communication
line. Any combination of these devices as
well as other RS-485 transceivers with a
total of 32 unit loads or fewer can be con-
nected to the line.
REDUCED EMI AND REFLECTIONS
The SP3070E, SP3071E and SP3072E fea-
ture reduced slew-rate drivers that minimize
EMI and reduce reflections caused by im-
properly terminated cables, allowing error-
free data transmission up to 250kbps. The
SP3073, SP3074 and SP3075 offer higher
driver output slew-rate limits, allowing trans-
mit speeds up to 500kbps.
LOW POWER SHUTDOWN MODE
Low-power shutdown mode is initiated by
bringing both RE high and DE low. In shut-
down, the devices typically draw only 50nA
of supply current.
RE and DE can be driven simultaneously;
the parts are guaranteed not to enter shut-
down if RE is high and DE is low for less than
50ns. If the inputs are in this state for at least
600ns, the parts are guaranteed to enter
shutdown.
Enable times t
ZH
and t
ZL
assume the part
was not in a low-power shutdown state.
Enable times t
ZH(SHDN)
and t
ZL(SHDN)
assume
the parts were shut down. It takes drivers
and receivers longer to become enabled
from low-power shutdown mode t
ZH(SHDN)
and t
ZL(SHDN)
than from driver/receiver-dis-
able mode (t
ZH
, t
ZL
)
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
16
DRIVER OUTPUT PROTECTION
Two mechanisms prevent excessive output
current and power dissipation caused by
faults or by bus contention. First, current
limit on the ouput stage, provides immediate
protection against short circuits over the
whole common-mode voltage range. Sec-
ond, a thermal-shutdown circuit, forces the
driver outputs into a high-impedance state if
the die temperature becomes excessive.
LINE LENGTH
The RS-485/RS422 standard covers line
lengths up to 4000ft.
DETAILED DESCRIPTION
TYPICAL APPLICATIONS
The SP3072E, SP3075E and SP3078E
transceivers are designed for bidirectional
data communications on multipoint bus trans-
mission lines.
To minimize reflections, terminate the line at
both ends in its characteristic impedance,
and keep stub lengths off the main line as
short as possible. The slew-rate-limited
SP3070 - SP3075E are more tolerant of
imperfect termination.
PARTS SELECTOR GUIDE
T
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17
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
PACKAGE: 8 PIN NSOIC
A
A1
A2
SIDE VIEW
Seating Plane
SECTION B-B
WITH PLATING
SYMBOL
MIN
NOM
MAX
A
1.35
-
1.75
A1
0.1
-
0.25
A2
1.25
-
1.65
b
0.31
-
0.51
c
0.17
-
0.24
D
E
E1
e
L
0.4
-
1.27
L1
L2
0
-
8
1
5
-
15
Note: Dimensions in (mm)
8 Pin NSOIC JEDEC MO-012 (AA) Variation
4.90 BSC
6.00 BSC
3.90 BSC
1.27 BSC
1.04 REF
0.25 BSC
Gauge Plane
L1
L
1
Seating Plane
L2
VIEW C
TOP VIEW
b
SEE VIEW C
B
B
E
E/2
E1
INDEX AREA
(D/2 X E1/2)
E1/2
D
1
e
c
BASE METAL
b
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
18
PACKAGE: 14 PIN NSOIC
TOP VIEW
b
Gauge Plane
L1
L
1
Seating Plane
L2
VIEW C
SEE VIEW C
B
B
SECTION B-B
WITH PLATING
c
BASE METAL
b
A
A1
A2
SYMBOL
MIN
NOM
MAX
A
1.35
-
1.75
A1
0.1
-
0.25
A2
1.25
-
1.65
b
0.31
-
0.51
c
0.17
-
0.25
D
E
E1
e
L
0.4
-
1.27
L1
L2
0
-
8
1
5
-
15
Note: Dimensions in (mm)
1.27 BSC
1.04 REF
0.25 BSC
14 Pin NSOIC JEDEC MO-012 (AB) Variation
8.65 BSC
6.00 BSC
3.90 BSC
E
E/2
E1
INDEX AREA
(D/2 X E1/2)
E1/2
D
1
e
SIDE VIEW
Seating Plane
19
Date: 03/
31/05 SP3070E - SP3078E Family, 15kV ESD-Protected, Failsafe RS-485/RS422 Transceivers Copyright 2005 Sipex Corporation
Corporation
ANALOG EXCELLENCE
Sipex Corporation
Headquarters and
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Model
Temperature Range
Package
SP3070EEN .................................................... -40C to +85C ..................................................... 14-pin NSOIC
SP3070EEN/TR .............................................. -40C to +85C ..................................................... 14-pin NSOIC
SP3070EMN .................................................. -40C to +125C .................................................... 14-pin NSOIC
SP3070EMN/TR ............................................ -40C to +125C .................................................... 14-pin NSOIC
SP3071EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC
SP3071EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC
SP3071EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC
SP3071EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC
SP3072EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC
SP3072EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC
SP3072EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC
SP3072EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC
SP3073EEN .................................................... -40C to +85C ..................................................... 14-pin NSOIC
SP3073EEN/TR .............................................. -40C to +85C ..................................................... 14-pin NSOIC
SP3073EMN .................................................. -40C to +125C .................................................... 14-pin NSOIC
SP3073EMN/TR ............................................ -40C to +125C .................................................... 14-pin NSOIC
SP3074EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC
SP3074EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC
SP3074EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC
SP3074EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC
SP3075EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC
SP3075EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC
SP3075EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC
SP3075EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC
SP3076EEN .................................................... -40C to +85C ..................................................... 14-pin NSOIC
SP3076EEN/TR .............................................. -40C to +85C ..................................................... 14-pin NSOIC
SP3076EMN .................................................. -40C to +125C .................................................... 14-pin NSOIC
SP3076EMN/TR ............................................ -40C to +125C .................................................... 14-pin NSOIC
SP3077EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC
SP3077EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC
SP3077EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC
SP3077EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC
SP3078EEN .................................................... -40C to +85C ....................................................... 8-pin NSOIC
SP3078EEN/TR .............................................. -40C to +85C ....................................................... 8-pin NSOIC
SP3078EMN .................................................. -40C to +125C ...................................................... 8-pin NSOIC
SP3078EMN/TR ............................................ -40C to +125C ...................................................... 8-pin NSOIC
ORDERING INFORMATION
For availability of PDIP or other packaging
and "M" temperatures contact factory.
Available in lead free packaging. To order add "-L" suffix to part number.
Example: SP3074EEN/TR = standard; SP3074EEN-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 2,500 for NSOIC.
CLICK HERE TO ORDER SAMPLES
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