SN75ALS121 Datasheet | Texas Instruments

description The SN75ALS121 dual line driver is designed for digital data transmission over lines having impedances from 50 to 500 Ω. It is patible 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 REMENDED FOR NEW DESIGN FUNCTION TABLE INPUTS OUTPUT A BC DE F H HH HX X X XX XHH All other input binations H = high level, L = low level, X = irrelevant The low-impedance emitter-follower outputs drive terminated lines such as coaxial cable, strip line, or twisted pair. Having the outputs unmitted 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 IMPACT process 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 SN75ALS121 DUAL LINE DRIVER ą SLLS030A - D1334, SEPTEMBER 1987 - REVISED AUGUST 1989 logic symbol† logic diagram (positive logic) 1A 1 1B 2 1C 3 1D 4 1E 5 1F 6 2A 10 2B 11 2C 12 13 2D 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. 1A 1 1B 2 1C 3 1D 4 1E 5 1F 6 2A 2B 2C 10 11...