DS1691A/DS3691
(RS-422/RS-423) Line Drivers with TRI-STATE
Outputs
General Description
The DS1691A/DS3691 are low power Schottky TTL line driv-
ers designed to meet the requirements of EIA standards
RS-422 and RS-423. They feature 4 buffered outputs with
high source and sink current capability with internal short cir-
cuit protection. A mode control input provides a choice of op-
eration either as 4 single-ended line drivers or 2 differential
line drivers. A rise time control pin allows the use of an exter-
nal capacitor to slow the rise time for suppression of near
end crosstalk to other receivers in the cable. Rise time ca-
pacitors are primarily intended for waveshaping output sig-
nals in the single-ended driver mode. Multipoint applications
in differential mode with waveshaping capacitors is not al-
lowed.
With the mode select pin low, the DS1691A/DS3691 are
dual-differential line drivers with TRI-STATE outputs. They
feature
10V output common-mode range in TRI-STATE
mode and 0V output unbalance when operated with
5V
supply.
Features
n
Dual RS-422 line driver with mode pin low, or quad
RS-423 line driver with mode pin high
n
TRI-STATE outputs in RS-422 mode
n
Short circuit protection for both source and sink outputs
n
Outputs will not clamp line with power off or in
TRI-STATE
n
100
transmission line drive capability
n
Low I
CC
and I
EE
power consumption
RS-422:
I
CC
= 9 mA/driver typ
RS-423:
I
CC
= 4.5 mA/driver typ:
I
EE
= 2.5 mA/driver typ
n
Low current PNP inputs compatible with TTL, MOS and
CMOS
n
Pin compatible with AM26LS30
Connection Diagrams
Ordering Information
Order Number
Package Type
NS Package Number
DS3691M
SO Package
M16A
DS3691N
Molded DIP
N16E
For Complete Military Product Specifications, refer to the appropriate SMD or MDS.
DS1691AJ/883
Ceramic DIP
J16A
TRI-STATE
is a registered trademark of National Semiconductor Corporation.
With Mode Select LOW
(RS-422 Connection)
DS005783-1
Top View
With Mode Select HIGH
(RS-423 Connection)
DS005783-2
Top View
July 1998
DS1691A/DS3691
(RS-422/RS-423)
Line
Drivers
with
TRI-ST
A
T
E
Outputs
1998 National Semiconductor Corporation
DS005783
www.national.com
Absolute Maximum Ratings
(Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
V
CC
7V
V
EE
-7V
Maximum Power Dissipation (Note 1) at 25C
Cavity Package
1509 mW
Molded DIP Package
1476 mW
SO Package
1051 mW
Input Voltage
15V
Output Voltage (Power OFF)
15V
Storage Temperature
-65C to + 150C
Lead Temperature
(Soldering, 4 seconds)
260C
Operating Conditions
Min
Max
Units
Supply Voltage
DS1691A
V
CC
4.5
5.5
V
V
EE
-4.5
-5.5
V
DS3691
V
CC
4.75
5.25
V
V
EE
-4.75
-5.25
V
Temperature (T
A
)
DS1691A
-55
+125
C
DS3691
0
+70
C
Note 1: Derate cavity package 10.1 mW/C above 25C; derate molded DIP
package 11.9 mW/C above 25C. Derate SO package 8.41 mW/C above
25C.
DC Electrical Characteristics
(Notes 3, 4, 5, 6)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RS-422 CONNECTION, V
EE
CONNECTION TO GROUND, MODE SELECT
0.8V
V
IH
High Level Input Voltage
2
V
V
IL
Low Level Input Voltage
0.8
V
I
IH
High Level Input Current
V
IN
= 2.4V
1
40
A
V
IN
15V
10
100
A
I
IL
Low Level Input Current
V
IN
= 0.4V
-30
-200
A
V
I
Input Clamp Voltage
I
IN
= -12 mA
-1.5
V
V
O
Differential Output Voltage
R
L
=
V
IN
= 2V
3.6
6.0
V
V
O
V
A,B
V
IN
= 0.8V
-3.6
-6.0
V
V
T
Differential Output Voltage
R
L
= 100
V
IN
= 2V
2
2.4
V
V
T
V
A,B
V
CC
4.75V
V
IN
= 0.8V
-2
-2.4
V
V
OS
, V
OS
Common-Mode Offset
R
L
= 100
2.5
3
V
Voltage
|V
T
| - | V
T
|
Difference in Differential
R
L
= 100
0.05
0.4
V
Output Voltage
|V
OS
| - | V
OS
|
Difference in Common-
R
L
= 100
0.05
0.4
V
Mode Offset Voltage
V
SS
|V
T
- V
T
|
R
L
= 100
, V
CC
4.75V
4.0
4.8
V
V
CMR
Output Voltage Common-
V
DISABLE
= 2.4V
10
V
Mode Range
I
XA
Output Leakage Current
V
CC
= 0V
V
CMR
= 10V
100
A
I
XB
Power OFF
V
CMR
= -10V
-100
A
I
OX
TRI-STATE Output Current
V
CC
= Max
V
CMR
10V
100
A
V
EE
= 0V and -5V
V
CMR
-10V
-100
A
I
SA
Output Short Circuit Current
V
IN
= 0.4V
V
OA
= 6V
80
150
mA
V
OB
= 0V
-80
-150
mA
I
SB
Output Short Circuit Current
V
IN
= 2.4V
V
OA
= 0V
-80
-150
mA
V
OB
= 6V
80
150
mA
I
CC
Supply Current
18
30
mA
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2
AC Electrical Characteristics
(Note 6)
T
A
= 25C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RS-422 CONNECTION, V
CC
= 5V, MODE SELECT = 0.8V
t
r
Output Rise Time
R
L
= 100
, C
L
= 500 pF (Figure 1 )
120
200
ns
t
f
Output Fall Time
R
L
= 100
, C
L
= 500 pF (Figure 1 )
120
200
ns
t
PDH
Output Propagation Delay
R
L
= 100
, C
L
= 500 pF (Figure 1 )
120
200
ns
t
PDL
Output Propagation Delay
R
L
= 100
, C
L
= 500 pF (Figure 1 )
120
200
ns
t
PZL
TRI-STATE Delay
R
L
= 450
, C
L
= 500 pF, C
C
= 0 pF (Figure 4 )
250
350
ns
t
PZH
TRI-STATE Delay
R
L
= 450
, C
L
= 500 pF, C
C
= 0 pF (Figure 4 )
180
300
ns
t
PLZ
TRI-STATE Delay
R
L
= 450
, C
L
= 500 pF, C
C
= 0 pF (Figure 4 )
180
300
ns
t
PHZ
TRI-STATE Delay
R
L
= 450
, C
L
= 500 pF, C
C
= 0 pF (Figure 4 )
250
350
ns
DC Electrical Characteristics
(Notes 3, 4, 5, 6)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RS-423 CONNECTION, |V
CC
| = |V
EE
|, MODE SELECT
2V
V
IH
High Level Input Voltage
2
V
V
IL
Low Level Input Voltage
0.8
V
I
IH
High Level Input Current
V
IN
= 2.4V
1
40
A
V
IN
15V
10
100
A
I
IL
Low Level Input Current
V
IN
= 0.4V
-30
-200
A
V
I
Input Clamp Voltage
I
IN
= -12 mA
-1.5
V
V
O
Output Voltage
R
L
=
, (Note 7)
V
IN
= 2V
4.0
4.4
6.0
V
V
O
V
CC
4.75V
V
IN
= 0.4V
-4.0
-4.4
-6.0
V
V
T
Output Voltage
R
L
= 450
V
IN
= 2.4V
3.6
4.1
V
V
T
V
CC
4.75V
V
IN
= 0.4V
-3.6
-4.1
V
|V
T
| - | V
T
|
Output Unbalance
|V
CC
| = |V
EE
| = 4.75V, R
L
= 450
0.02
0.4
V
I
X
+
Output Leakage Power OFF
V
CC
= V
EE
= 0V
V
O
= 6V
2
100
A
I
X
-
Output Leakage Power OFF
V
CC
= V
EE
= 0V
V
O
= -6V
-2
-100
A
I
S
+
Output Short Circuit Current
V
O
= 0V
V
IN
= 2.4V
-80
-150
mA
I
S
-
Output Short Circuit Current
V
O
= 0V
V
IN
= 0.4V
80
150
mA
I
SLEW
Slew Control Current
140
A
I
CC
Positive Supply Current
V
IN
= 0.4V, R
L
=
18
30
mA
I
EE
Negative Supply Current
V
IN
= 0.4V, R
L
=
-10
-22
mA
Note 2: "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of "Electrical Characteristics" provide conditions for actual device operation.
Note 3: Unless otherwise specified, min/max limits apply across the -55C to +125C temperature range for the DS1691A and across the 0C to +70C range for
the DS3691. All typicals are given for V
CC
= 5V and T
A
= 25C. V
CC
and V
EE
as listed in operating conditions.
Note 4: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified.
Note 5: Only one output at a time should be shorted.
Note 6: Symbols and definitions correspond to EIA RS-422 and/or RS-423 where applicable.
Note 7: At -55C, the output voltage is +3.9V minimum and -3.9V minimum.
AC Electrical Characteristics
(Note 6)
T
A
= 25C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RS-423 CONNECTION, V
CC
= 5V, V
EE
-5V, MODE SELECT = 2.4V
t
r
Rise Time
R
L
= 450
, C
L
= 500 pF, C
C
= 0 (Figure 2 )
120
300
ns
t
f
Fall Time
R
L
= 450
, C
L
= 500 pF, C
C
= 0 (Figure 2 )
120
300
ns
t
r
Rise Time
R
L
= 450
, C
L
= 500 pF C
C
= 50 pF (Figure 3 )
3.0
s
t
f
Fall Time
R
L
= 450
, C
L
= 500 pF C
C
= 50 pF (Figure 3 )
3.0
s
t
rc
Rise Time Coefficient
R
L
= 450
, C
L
= 500 pF, C
C
= 50 pF (Figure 3 )
0.06
s/pF
3
www.national.com
AC Electrical Characteristics
(Note 6) (Continued)
T
A
= 25C
Symbol
Parameter
Conditions
Min
Typ
Max
Units
RS-423 CONNECTION, V
CC
= 5V, V
EE
-5V, MODE SELECT = 2.4V
t
PDH
Output Propagation Delay
R
L
= 450
, C
L
= 500 pF, C
C
= 0 (Figure 2 )
180
300
ns
t
PDL
Output Propagation Delay
R
L
= 450
, C
L
= 500 pF, C
C
= 0 (Figure 2 )
180
300
ns
AC Test Circuits and Switching Time Waveforms
DS005783-3
DS005783-4
FIGURE 1. Differential Connection
DS005783-5
DS005783-6
FIGURE 2. RS-423 Connection
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4
AC Test Circuits and Switching Time Waveforms
(Continued)
Switching Waveforms
DS005783-7
DS005783-8
FIGURE 3. Rise Time Control for RS-423
DS005783-9
DS005783-10
FIGURE 4. TRI-STATE Delays
DS005783-11
FIGURE 5. Typical Output Voltage
5
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