SN75ALS191
DUAL DIFFERENTIAL LINE DRIVER
SLLS032B – DECEMBER 1987 – REVISED MA Y 1995
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
ANSI Standard EIA/TIA-422-B and ITU
Recommendation V.11
D
Designed to Operate at 20 Mbaud or Higher
D
TTL-and CMOS-Input Compatibility
D
Single 5-V Supply Operation
D
Output Short-Circuit Protection
D
Improved Replacement for the µA9638
description
The SN75ALS191 is a dual, high-speed, differential line driver designed to meet ANSI Standard EIA/TIA-422-B
and ITU Recommendation V.11. The inputs are TTL- and CMOS-compatible and have input clamp diodes.
Schottky-diode-clamped transistors minimize propagation delay time. This device operates from a single 5-V
power supply and is supplied in eight-pin packages.
The SN75ALS191 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
(each driver)
INPUTS
OUTPUTS
A
Y Z
H H L
L L H
H = high level, L = low level,
Z = high impedance
logic symbol
†
2A
1A
3
2
2Z
2Y
1Z
1Y
5
6
7
8
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
logic diagram (positive logic)
8
7
1Y
1Z
2
1A
6
5
2Y
2Z
3
2A
Copyright 1995, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
1
2
3
4
8
7
6
5
V
CC
1A
2A
GND
1Y
1Z
2Y
2Z
D OR P PACKAGE
(TOP VIEW)
SN75ALS191
DUAL DIFFERENTIAL LINE DRIVER
SLLS032B – DECEMBER 1987 – REVISED MA Y 1995
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT TYPICAL OF ALL OUTPUTS
Output
GND
10 Ω
V
CC
40 kΩ NOM
Input
V
CC
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
(see Note 1) 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage, V
I
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
A
0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. All voltage values except differential output voltage (VOD) are with respect to network ground terminal.
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
D 725 mW 5.8 mW/°C 464 mW
P 1000 mW 8.0 mW/°C 640 mW
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
2 V
Low-level input voltage, V
IL
0.8 V
High-level output current, I
OH
–50 mA
Low-level output current, I
OL
50 mA
Operating free-air temperature, T
A
0 70 °C
SN75ALS191
DUAL DIFFERENTIAL LINE DRIVER
SLLS032B – DECEMBER 1987 – REVISED MA Y 1995
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
V
IK
Input clamp voltage VCC = 4.75 V , II = –18 mA –1 –1.2 V
V
= 4.75 V, V
= 2 V
,
IOH = – 10 mA 2.5 3.3
VOHHigh-l
evel output voltage
V
CC
4.75 V, V
IH
2
V,
VIL = 0.8 V
IOH = – 40 mA 2
V
V
OL
Low-level output voltage
VCC = 4.75 V , VIH = 2 V,
IOL = 40 mA
VIL = 0.8 V,
0.5 V
|V
OD1
| Differential output voltage VCC = 5.25 V , IO = 0 2 V
OD2
V
|V
OD2
| Differential output voltage 2 V
∆ |VOD|
Change in magnitude of
differential output voltage
‡
V
= 4.75 V to 5.25 V , R
= 100 Ω,
± 0.4 V
V
OC
Common-mode output voltage
§
CC
,
See Figure 1
L
,
3 V
∆ |VOC|
Change in magnitude of
common-mode output voltage
‡
± 0.4 V
VO = 6 V 0.1 100
I
O
Output current with power off VCC = 0
VO = – 0.25 V –0.1 –100
µA
VO = – 0.25 V to 6 V ±100
I
I
Input current VCC = 5.25 V , VI = 5.5 V 50 µA
I
IH
High-level input current VCC = 5.25 V , VI = 2.7 V 25 µA
I
IL
Low-level input current VCC = 5.25 V , VI = 0.5 V 200 µA
I
OS
Short-circuit output current
¶
VCC = 5.25 V , VO = 0 –50 –150 mA
I
CC
Supply current (all drivers) VCC = 5.25 V , No load, All inputs at 0 V 32 40 mA
†
All typical values are at VCC = 5 V and TA = 25°C.
‡
| VOD | and | VOC | are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a low
level.
§
In ANSI Standard EIA/TIA-422-B, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage,
VOS.
¶
Only one output at a time should be shorted, and duration of the short circuit should not exceed one second.
switching characteristics over recommended operating free-air temperature range, VCC = 5 V
PARAMETER TEST CONDITIONS MIN TYP#MAX UNIT
t
d(OD)
Differential-output delay time 3.5 7 ns
t
t(OD)
Differential-output transition time
CL = 15 pF, RL = 100 Ω, See Figure 2
3.5 7 ns
Skew 1.5 4 ns
# Typical values are at TA = 25°C.
SN75ALS191
DUAL DIFFERENTIAL LINE DRIVER
SLLS032B – DECEMBER 1987 – REVISED MA Y 1995
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
V
OD2
V
OC
50 Ω
50 Ω
Input
Figure 1. Differential and Common-Mode Output Voltages
VOLTAGE W AVEFORMSTEST CIRCUIT
Z Output
RL = 100 Ω
50 Ω
C
L
C
L
Y Output
90%
0 V
3 V
1.5 V
1.5 V
t
d(OD)
Differential
Output
t
d(OD)
Input
90%
10% 10%
t
t(OD)
t
t(OD)
50%
50%
Y Output
Skew
Z Output
V
OH
V
OL
V
OH
V
OL
Generator
(see Note A)
CL = 15 pF
(see Note B)
50% 50%
Skew
NOTES: A. The input pulse generator has the following characteristics: ZO = 50 Ω, PRR ≤ 500 kHz, tw = 100 ns, tr = ≤ 5 ns.
B. CL includes probe and jig capacitance.
Figure 2. Test Circuit and Voltage Waveforms
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