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SLLS031B − D1332, SEPTEMBER 1987 − REVISED FEBRUARY 1993
D PACKAGE
(TOP VIEW)
• Meets IBM 360 Input Interface
Specifications
• Permits Digital Data Transmission Over
V
1A
1B
1
2
3
4
5
6
7
8
16
15
14
CC
Coaxial Cable, Strip Line, or Twisted Pair
2F
2E
• TTL Compatible With 5-V Supply
1C
13 2D
12 2C
1D
• 3.11-V Output at I
= − 59.3 mA
OH
1E
• Uncommitted Emitter-Follower Output
11
10
9
2B
2A
2Y
1F
Structure for Party-Line Operation
1Y
• IMPACT Low-Power Schottky Technology
GND
• Improved Replacement for the SN75123
and Signetics 8T13
• Glitchless Power-Up/Power-Down
NOT RECOMMENDED FOR NEW DESIGN
Protection
• Short-Circuit Protection
FUNCTION TABLE
• AND-OR Logic Configuration
• High Speed . . . Maximum Propagation
INPUTS
OUTPUT
Delay Time of 14 ns at C = 15 pF
L
A
H
X
B
H
X
C
D
H
X
E
X
H
F
X
H
Y
H
H
L
H
X
description
All other input combinations
The SN75ALS123 dual line driver is specifically
designed to meet the input interface specifications
for the IBM System 360. It is compatible with
standard TTL logic and supply voltage levels. The
low-impedance, emitter-follower outputs drive
terminated lines such as coaxial cable, strip line,
or twisted pair. The uncommitted output allows
wired-OR logic to be performed in party-line
applications. Output short-circuit protection is
provided by an internal clamping network that
turns on when the output voltage drops below
approximately 1.5 V. All inputs are in conventional
TTL configuration. Gating can be used during
power-up and power-down sequences to ensure
that no noise is introduced on the line.
H = high level L = low level
X = irrelevant
†
logic symbol
1
&
≥ 1
1A
2
1B
3
1C
7
1Y
4
1D
5
&
1E
6
1F
10
2A
11
2B
12
2C
9
2Y
The SN75ALS123 employs the IMPACT
process to achieve fast switching speeds, low
power dissipation, and reduced input current
requirements.
13
2D
14
2E
15
2F
†
The SN75ALS123 is characterized for operation
from 0°C to 70°C.
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
logic diagram, each driver (positive logic)
A
B
C
D
Y
E
F
IMPACT is a trademark of Texas Instruments Incorporated.
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Copyright 1993, Texas Instruments Incorporated
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2−1
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