1
PS2099B 11/17/02
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PI74LCX245
Fast CMOS 3.3V 8-Bit Bidirectional Transceiver
Product Features
Functionally compatible with FCT3, LVT, and 74 series
245 families of products
Tri-State outputs
5V Tolerant inputs and outputs
2.0V-3.6V V
CC
supply operation
Balanced sink and source output drives (24 mA)
Low ground bounce outputs
Power Down High Impedance inputs and outputs
Supports live insertion
ESD Protection exceeds 2000V, Human Body Model
200V, Machine Model
Packages available:
20-pin 209-mil wide plastic SSOP (H)
20-pin 173-mil wide plastic TSSOP (L)
20-pin 150-mil wide plastic QSOP (Q)
20-pin 300-mil wide plastic SOIC (S)
Product Description
Pericom Semiconductor's PI74LCX series of logic circuits are
produced using the Company's advanced 0.6 micron CMOS
technology achieving high speed while maintaining low power
operation.
The PI74LCX245 is an 8-bit bidirectional transceiver designed for
asynchronous two-way communication between data buses.
The transmit/receive input pin (T/R) determines the direction of data
flow through the bidirectional transceiver. Transmit (active HIGH)
enables data from A ports to B ports, and receive (active LOW) from
B ports to A ports. The output enable (OE) input, when HIGH,
disables both A and B ports by placing them in HIGH Z condition.
The PI74LCX245 can be driven from either 3.3V or 5.0V devices
allowing this device to be used as a translator in a mixed 3.3V/5.0V
system.
Logic Block Diagram
Product Pin Configuration
Product Pin Description
Truth Table
(1)
Note:
1. H = High Voltage Level, X = Don't Care,
L = Low Voltage Level, Z = High Impedance
s
t
u
p
n
I
)
1
(
s
t
u
p
t
u
O
)
1
(
E
O
R
/
T
L
L
A
s
u
B
o
t
a
t
a
D
B
s
u
B
L
H
B
s
u
B
o
t
a
t
a
D
A
s
u
B
H
X
Z
e
t
a
t
S
h
g
i
H
20-Pin
H20
L20
Q20
S20
e
m
a
N
n
i
P
n
o
i
t
p
i
r
c
s
e
D
OE
e
l
b
a
n
E
t
u
p
t
u
O
e
t
a
t
S
-
3
)
W
O
L
e
v
it
c
A
(
s
t
u
p
n
I
R
/
T
t
u
p
n
I
l
o
r
t
n
o
C
n
o
it
c
e
r
i
D
7
A
-
0
A
r
o
s
t
u
p
n
I
A
e
d
i
S
s
t
u
p
t
u
O
e
t
a
t
S
-
3
7
B
-
0
B
r
o
s
t
u
p
n
I
B
e
d
i
S
s
t
u
p
t
u
O
e
t
a
t
S
-
3
D
N
G
d
n
u
o
r
G
V
CC
r
e
w
o
P
B
0
A
0
OE
T/R
B
1
A
1
B
2
A
2
B
3
A
3
B
4
A
4
B
5
1
A
5
B
6
A
6
B
7
A
7
2
PS2099B 11/17/02
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PI74LCX245
3.3V 8-Bit Bi-Directional Transceiver
Maximum Ratings
(Above which the useful life may be impaired. For user guidelines, not tested.)
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the de-
vice. This is a stress rating only and functional opera-
tion of the device at these or any other conditions
above those indicated in the operational sections of
this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods
may affect reliability.
Recommended Operating Conditions
l
o
b
m
y
S
r
e
t
e
m
a
r
a
P
.
n
i
M
.
x
a
M
s
t
i
n
U
V
CC
e
g
a
tl
o
V
y
l
p
p
u
S
g
n
it
a
r
e
p
O
0
.
2
6
.
3
V
n
o
it
n
e
t
e
R
a
t
a
D
5
.
1
6
.
3
V
I
e
g
a
tl
o
V
t
u
p
n
I
0
5
.
5
V
O
e
g
a
tl
o
V
t
u
p
t
u
O
e
t
a
t
S
W
O
L
r
o
H
G
I
H
0
V
CC
e
t
a
t
S
-
I
R
T
0
5
.
5
I
OH
I
/
OL
t
n
e
r
r
u
C
t
u
p
t
u
O
V
CC
V
6
.
3
-
V
0
.
3
=
4
2
A
m
V
CC
V
7
.
2
=
2
1
T
A
e
r
u
t
a
r
e
p
m
e
T
g
n
it
a
r
e
p
O
r
i
A
-
e
e
r
F
-
0
4
5
8
+
C
/t
V
e
t
a
R
e
g
d
E
t
u
p
n
I
V
,
V
0
.
2
-
V
8
.
0
=
V
CC
V
0
.
3
=
0
0
1
V
/
s
n
Storage Temperature ............................................................65C to +150C
Ambient Temperature with Power Applied ...........................40C to +85C
Supply Voltage to Ground Potential (Inputs & Vcc Only) ... 0.5V to +7.0V
Supply Voltage to Ground Potential (Outputs & D/O Only) 0.5V to +7.0V
DC Input Voltage ................................................................... 0.5V to +7.0V
DC Output Current .............................................................................. 120 mA
Power Dissipation ................................................................................... 1.0W
3
PS2099B 11/17/02
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PI74LCX245
3.3V 8-Bit Bi-Directional Transceiver
Notes:
1. For Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 3.3V, +25C ambient.
3. Per TTL driven input; all other inputs at Vcc or GND.
s
r
e
t
e
m
a
r
a
P
n
o
i
t
p
i
r
c
s
e
D
s
n
o
i
t
i
d
n
o
C
t
s
e
T
)
1
(
.
n
i
M
p
y
T
)
2
(
.
x
a
M
s
t
i
n
U
V
IH
e
g
a
tl
o
V
H
G
I
H
t
u
p
n
I
l
e
v
e
L
H
G
I
H
c
i
g
o
L
d
e
e
t
n
a
r
a
u
G
0
.
2
--
--
V
V
IL
e
g
a
tl
o
V
W
O
L
t
u
p
n
I
l
e
v
e
L
W
O
L
c
i
g
o
L
d
e
e
t
n
a
r
a
u
G
--
--
8
.
0
V
OH
e
g
a
tl
o
V
H
G
I
H
t
u
p
t
u
O
V
CC
6
.
3
-
7
.
2
=
I
OH
A
m
1
.
0
=
V
CC
2
.
0
-
--
--
V
CC
7
.
2
=
I
OH
A
m
2
1
=
2
.
2
--
--
V
CC
0
.
3
=
I
OH
A
m
8
1
=
4
.
2
--
--
I
OH
A
m
4
2
=
2
.
2
--
--
V
OL
e
g
a
tl
o
V
W
O
L
t
u
p
t
u
O
V
CC
6
.
3
-
7
.
2
=
I
OL
A
m
1
.
0
=
--
--
2
.
0
V
CC
7
.
2
=
I
OL
A
m
2
1
=
--
--
4
.
0
V
CC
0
.
3
=
I
OL
A
m
6
1
=
--
--
4
.
0
I
OL
A
m
4
2
=
--
--
5
5
.
0
V
IK
e
g
a
tl
o
V
e
d
o
i
D
p
m
a
l
C
V
CC
,.
n
i
M
=
I
IN
A
m
8
1
=
--
-
7
.
0
-
2
.
1
I
I
t
n
e
r
r
u
C
e
g
a
k
a
e
L
t
u
p
n
I
0
V
I
V
5
.
5
6
.
3
-
7
.
2
=
c
c
V
--
--
5
A
I
OZ
e
g
a
k
a
e
L
t
u
p
t
u
O
e
t
a
t
S
-
i
r
T
0
V
O
V
5
.
5
V
I
V
=
IH
V
r
o
IL
V
CC
6
.
3
-
7
.
2
=
--
--
5
I
OFF
e
l
b
a
s
i
D
n
w
o
D
r
e
w
o
P
V
CC
,
V
0
=
V
IN
V
r
o
OUT
V
5
.
5
--
--
0
1
I
CC
y
l
p
p
u
S
r
e
w
o
P
t
n
e
c
s
e
i
u
Q
t
n
e
r
r
u
C
V
CC
.
x
a
M
=
V
IN
V
r
o
D
N
G
=
CC
1
.
0
0
1
I
CC
y
l
p
p
u
S
r
e
w
o
P
t
n
e
c
s
e
i
u
Q
t
n
e
r
r
u
C
H
G
I
H
s
t
u
p
n
I
L
T
T
V
CC
.
x
a
M
=
V
IN
V
=
CC
V
6
.
0
)
3
(
0
0
5
s
r
e
t
e
m
a
r
a
P
n
o
i
t
p
i
r
c
s
e
D
s
n
o
i
t
i
d
n
o
C
t
s
e
T
l
a
c
i
p
y
T
s
t
i
n
U
C
IN
e
c
n
a
ti
c
a
p
a
C
t
u
p
n
I
V
CC
V
,
n
e
p
O
=
I
V
r
o
V
0
=
CC
7
F
p
C
OUT
e
c
n
a
ti
c
a
p
a
C
t
u
p
t
u
O
V
CC
V
,
V
3
.
3
=
I
V
r
o
V
0
=
CC
8
C
PD
e
c
n
a
ti
c
a
p
a
C
n
o
it
a
p
i
s
s
i
D
r
e
w
o
P
V
CC
V
,
V
3
.
3
=
I
V
r
o
V
0
=
CC
,
z
H
M
0
1
=
F
5
2
Capacitance
DC Electrical Characteristics
(Over the Operating Range, T
A
=
-
40C to +85C, V
CC
= 2.7V to 3.6V)
10
4
PS2099B 11/17/02
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PI74LCX245
3.3V 8-Bit Bi-Directional Transceiver
Switching Characteristics over Operating Range
Notes:
1. Skew between any two outputs, of the same package, switching in the same direction.
Dynamic Switching Characteristics (T
A
= +25C)
Note:
1. Measured with n1 outputs switching from High-to-Low or Low-to-High. The remaining output is measured in the LOW state.
s
r
e
t
e
m
a
r
a
P
n
o
i
t
p
i
r
c
s
e
D
s
n
o
i
t
i
d
n
o
C
V
CC
V
3
.
0
V
3
.
3
=
V
CC
V
7
.
2
=
s
t
i
n
U
.
n
i
M
.
x
a
M
.
n
i
M
.
x
a
M
t
PLH
t
PHL
y
a
l
e
D
n
o
it
a
g
a
p
o
r
P
D
XX
O
o
t
XX
C
L
F
p
0
5
=
R
L
0
0
5
=
5
.
1
0
.
7
5
.
1
0
.
8
s
n
t
PZH
t
PZL
e
m
it
e
l
b
a
n
E
t
u
p
t
u
O
5
.
1
5
.
8
5
.
1
5
.
9
t
PHZ
t
PLZ
e
m
i
T
e
l
b
a
s
i
D
t
u
p
t
u
O
5
.
1
5
.
7
5
.
1
5
.
8
t
SK
(
O
)
w
e
k
S
t
u
p
t
u
O
)
1
(
0
.
1
s
r
e
t
e
m
a
r
a
P
n
o
i
t
p
i
r
c
s
e
D
s
n
o
i
t
i
d
n
o
C
t
s
e
T
)
1
(
.
p
y
T
s
t
i
n
U
V
OLP
e
g
a
tl
o
V
k
a
e
P
W
O
L
c
i
m
a
n
y
D
V
CC
C
,
V
3
.
3
=
L
F
p
0
5
=
V
IH
V
,
V
3
.
3
=
IL
V
0
=
8
.
0
V
V
OLV
e
g
a
tl
o
V
y
e
ll
a
V
W
O
L
c
i
m
a
n
y
D
V
CC
C
,
V
3
.
3
=
L
F
p
0
5
=
V
IH
V
,
V
3
.
3
=
IL
V
0
=
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
5
PS2099B 11/17/02
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PI74LCX245
3.3V 8-Bit Bi-Directional Transceiver
Packaging Mechanical - 20-pin SSOP (H-package)
Packaging Mechanical - 20-pin TSSOP (L-package)
.272
.295
.078
.002
SEATING
PLANE
.0098
Max.
.0256
BSC
.022
.037
.004
.009
.291
.322
1
20
.197
.220
0.25
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.050
7.40
8.20
0.55
0.95
0.09
0.25
5.00
5.60
2.00
6.90
7.50
0.65
Max
Min
.252
.260
.047
1.20
.002
.006
SEATING
PLANE
.0256
BSC
.018
.030
.004
.008
.238
.269
1
20
.169
.177
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
0.05
0.15
6.1
6.7
0.45
0.75
0.09
0.20
4.3
4.5
6.4
6.6
0.65
0.19
0.30
.007
.012
Max
6
PS2099B 11/17/02
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PI74LCX245
3.3V 8-Bit Bi-Directional Transceiver
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
SEATING
PLANE
.050
BSC
1
20
0-8
.2914
.2992
X.XX
X.XX
DENOTES CONTROLLING
DIMENSIONS IN MILLIMETERS
7.40
7.60
.496
.511
12.60
12.99
1.27
.0926
.1043
2.35
2.65
.394
.419
10.00
10.65
.0040
.0118
0.10
0.30
.013
.020
0.33
0.51
.010
.029
0.254
0.737
.0091
.0125
0.23
0.32
0.41
1.27
.016
.050
x 45
.020
.030
0.508
0.762
REF
Pericom Semiconductor Corporation
2380 Bering Drive San Jose, CA 95131 1-800-435-2336 Fax (408) 435-1100 http://www.pericom.com
Ordering Information
Packaging Mechanical - 20-pin QSOP (Q-package)
Packaging Mechanical - 20-pin SOIC (S-package)
.337
.344
.053
.069
.004
.010
SEATING
PLANE
.025
BSC
.007
.010
.228
.244
.150
.157
1
20
.016
.050
X.XX
X.XX
DENOTES DIMENSIONS
IN MILLIMETERS
0.635
8.56
8.74
1.35
1.75
5.79
6.19
0.41
1.27
0.101
0.254
.008
.012
0.203
0.305
3.81
3.99
0.178
0.254
.058
1.47
.015 x 45
0.38
REF
Detail A
Detail A
.008
0.20
MIN.
Guage Plane
.010
0.254
.041
1.04
REF
.016
.035
0.41
0.89
0-6
.008
.013
0.20
0.33
e
d
o
C
g
n
i
r
e
d
r
O
n
o
i
t
p
i
r
c
s
e
D
H
5
4
2
X
C
L
4
7
I
P
)
H
(
P
O
S
S
c
it
s
a
l
P
e
d
i
w
li
m
-
9
0
2
n
i
P
-
0
2
L
5
4
2
X
C
L
4
7
I
P
)
L
(
P
O
S
S
T
c
it
s
a
l
P
e
d
i
w
li
m
-
3
7
1
n
i
P
-
0
2
Q
5
4
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