SN75ALS121 Datasheet | Dual Line Driver





(Datasheet) SN75ALS121 Datasheet PDF Download

Part Number SN75ALS121
Description Dual Line Driver
Manufacture etcTI
Total Page 7 Pages
PDF Download Download SN75ALS121 Datasheet PDF

Features: ą SN75ALS121 DUAL LINE DRIVER ą SLLS03 0A − D1334, SEPTEMBER 1987 − REVISE D AUGUST 1989 • Permits Digital Data Transmission Over Coaxial Cable, Strip Line, or Twisted Pair • Operates Wit h 50-Ω to 500-Ω Transmission Lines • TTL Compatible With 5-V Supply • 2.4-V Output at IOH = −75 mA • Unco mmitted Emitter-Follower Output Structu re for Party-Line Operation • IMPACT Low-Power Schottky Technology • Im proved Replacement for the SN75121 and Signetics 8T13 • Glitchless Power Up/ Power Down • Short-Circuit Protection • AND-OR Logic Configuration • Hig h Speed . . . Maximum Propagation Delay Time of 14 ns at CL = 15 pF descriptio n The SN75ALS121 dual line driver is de signed for digital data transmission ov er lines having impedances from 50 to 5 00 Ω. It is compatible with standard TTL logic and supply voltage levels. D OR N PACKAGE (TOP VIEW) 1A 1B 1C 1D 1 E 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 OUTPU.

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ą SN75ALS121
DUAL LINE DRIVER
ą
SLLS030A − D1334, SEPTEMBER 1987 − REVISED AUGUST 1989
Permits Digital Data Transmission Over
Coaxial Cable, Strip Line, or Twisted Pair
Operates With 50-to 500-Transmission
Lines
TTL Compatible With 5-V Supply
2.4-V Output at IOH = −75 mA
Uncommitted Emitter-Follower Output
Structure for Party-Line Operation
IMPACTLow-Power Schottky Technology
Improved Replacement for the SN75121
and Signetics 8T13
Glitchless Power Up/Power Down
Short-Circuit Protection
AND-OR Logic Configuration
High Speed . . . Maximum Propagation
Delay Time of 14 ns at CL = 15 pF
description
The SN75ALS121 dual line driver is designed for
digital data transmission over lines having
impedances from 50 to 500 . It is compatible with
standard TTL logic and supply voltage levels.
D OR N 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
A BC DE F
Y
H HH HX X
X XX XHH
All other input combinations
H = high level, L = low level, X = irrelevant
H
H
L
The low-impedance emitter-follower outputs drive terminated lines such as coaxial cable, strip line, 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 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 SN75ALS121 employs the IMPACTprocess to achieve fast switching speeds, low power dissipation, and
reduced input current requirements.
The SN75ALS121 is characterized for operation from 0°C to 70°C.
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.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77001
Copyright 1989, Texas Instruments Incorporated
2−1

                    






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