SN75ALS123_08 Datasheet, PDF (1/5 Pages) Texas Instruments – DUAL LINE DRIVER

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• Meets IBM 360 Input Interface
Specifications
• Permits Digital Data Transmission Over
Coaxial Cable, Strip Line, or Twisted Pair
• TTL Compatible With 5-V Supply
• 3.11-V Output at I_OH = − 59.3 mA
• Uncommitted Emitter-Follower Output
Structure for Party-Line Operation
• IMPACT Low-Power Schottky Technology
• Improved Replacement for the SN75123
and Signetics 8T13
• Glitchless Power-Up/Power-Down
Protection
• Short-Circuit Protection
• AND-OR Logic Configuration
• High Speed . . . Maximum Propagation
Delay Time of 14 ns at C_L = 15 pF
description
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.
The SN75ALS123 employs the IMPACT
process to achieve fast switching speeds, low
power dissipation, and reduced input current
requirements.
The SN75ALS123 is characterized for operation
from 0°C to 70°C.
SN75ALS123
DUAL LINE DRIVER
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SLLS031B − D1332, SEPTEMBER 1987 − REVISED FEBRUARY 1993
D PACKAGE
(TOP VIEW)
1A 1
1B 2
1C 3
1D 4
1E 5
1F 6
1Y 7
GND 8
16 V_CC
15 2F
14 2E
13 2D
12 2C
11 2B
10 2A
9 2Y
NOT RECOMMENDED FOR NEW DESIGN
FUNCTION TABLE
INPUTS
OUTPUT
AB
C
D
E
F
Y
H
H
H
H
X
X
H
X
X
X
X
H
H
H
All other input combinations
L
H = high level L = low level X = irrelevant
logic symbol^†
1A ¹
1B ²
1C ³
1D ⁴
1E ⁵
1F ⁶
2A ¹⁰
2B ¹¹
2C ¹²
2D ¹³
2E ¹⁴
2F ¹⁵
&
≥1
&
7 _1Y
9 _2Y
† _{This symbol is in accordance with ANSI/IEEE Std 91-1984 and}
IEC Publication 617-12.
logic diagram, each driver (positive logic)
IMPACT is a trademark of 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.
A
B
C
D
Y
E
F
Copyright  1993, Texas Instruments Incorporated
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
• POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
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