SN75ALS123 Datasheet


Part Number

SN75ALS123

Description

Dual Line Driver

Manufacture

etcTI

Total Page 5 Pages
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Download SN75ALS123 Datasheet


Features Datasheet pdf ą • Meets IBM 360 Input Interface Spe cifications • Permits Digital Data Tr ansmission Over Coaxial Cable, Strip Li ne, or Twisted Pair • TTL Compatible With 5-V Supply • 3.11-V Output at IO H = − 59.3 mA • Uncommitted Emitter -Follower Output Structure for Party-Li ne Operation • IMPACT Low-Power Sc hottky Technology • Improved Replacem ent for the SN75123 and Signetics 8T13 • Glitchless Power-Up/Power-Down Prot ection • Short-Circuit Protection • AND-OR Logic Configuration • High Sp eed . . . Maximum Propagation Delay Tim e of 14 ns at CL = 15 pF description Th e SN75ALS123 dual line driver is specif ically designed to meet the input inter face specifications for the IBM System 360. It is compatible with standard TTL logic and supply voltage levels. The l ow-impedance, emitter-follower outputs drive terminated lines such as coaxial cable, strip line, or twisted pair. The uncommitted output allows wired-OR log ic to be performed in party-line applications. Output short-circuit protection is provided.
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SN75ALS123 Datasheet
ą
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 IOH = − 59.3 mA
Uncommitted Emitter-Follower Output
Structure for Party-Line Operation
IMPACTLow-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 CL = 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
ą
SLLS031B − D1332, SEPTEMBER 1987 − REVISED FEBRUARY 1993
D PACKAGE
(TOP VIEW)
1A
1B
1C
1D
1E
1F
1Y
GND
1
2
3
4
5
6
7
8
16 VCC
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
HH H H X X
H
XX X XHH
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
DY
E
F
Copyright 1993, Texas Instruments Incorporated
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
2−1




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