Texas Instruments SN75123D, SN75123DR, SN75123N, SN75123NS Datasheet
SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
D
Meets or Exceeds the Requirements of
IBM System 360 Input/Output Interface
Specification
D
Operate From Single 5-V Supply
D
TTL Compatible
D
3.11-V Output at IOH = –59.3 mA
D
Uncommitted Emitter-Follower Output
Structure for Party-Line Operation
D
Short-Circuit Protection
D
AND-OR Logic Configuration
D
Designed for Use With Triple Line Receiver
SN75124
D
Designed to Be Interchangeable With
N8T13 and N8T23
description
The SN75123 is a dual line driver specifically designed to meet the input/output interface specifications for IBM
System 360. It also is compatible with standard-TTL logic and supply-voltage levels.
The SN75123 low-impedance emitter-follower outputs drive terminated lines such as coaxial cable or twisted
pair. Having the outputs uncommitted 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 the inputs are in conventional TTL configuration, and the gating can be used
during power-up and power-down sequences to ensure that no noise is introduced to the line.
The SN75123 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
A B C D E F
Y
H H H H X X H
X XXXHH H
All other input combinations L
H = high level, L = low level, X = irrelevant
Copyright 1998, 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.
IBM is a trademark of International Business Machines Corp.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1A
1B
1C
1D
1E
1F
1Y
GND
V
CC
2F
2E
2D
2C
2B
2A
2Y
D OR N PACKAGE
(TOP VIEW)
THE SN751730 IS RECOMMENDED
FOR NEW IBM 360/370 INTERFACE DESIGNS.
SN75123
DUAL LINE DRIVER
SLLS086C – SEPTEMBER 1973 – REVISED APRIL 1998
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic symbol
†
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
1
1A
2
1B
3
1C
4
1D
7
&
5
1E
6
1F
10
2A
11
2B
12
2C
13
2D
14
2E
15
2F
9
≥1
&
logic diagram (positive logic)
A
B
C
D
E
F
Y
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