SN55121, SN75121 DUAL LINE DRIVERS

SLLS074C - SEPTEMBER 1973 - REVISED MAY 1998

features

Designed for Digital Data Transmission Over 50-Ω to 500-Ω Coaxial Cable, Strip Line, or Twisted Pair
High Speed
t_pd = 20 ns Maximum at C_L = 15 pF
TTL Compatible With Single 5-V Supply
2.4-V Output at I_OH = -75 mA
Uncommitted Emitter-Follower Output Structure for Party-Line Operation
Short-Circuit Protection
AND-OR Logic Configuration
Designed for Use With Triple Line Receivers SN55122, SN75122
Designed to Be Interchangeable With Signetics N8T13

description

The SN55121 and SN75121 dual line drivers are designed for digital data transmission over lines having impedances from 50 to 500 Ω. They are also compatible with standard TTL logic and supply-voltage levels.

The low-impedance emitter-follower outputs of the SN55121 and SN75121 can 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 of 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 SN55121 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN75121 is characterized for operation from 0°C to 70°C.

H = high level, L = low level, X = irrelevant

Title: DUAL LINE DRIVERS
Product Family: TRANSMITTERS AND RECEIVERS
Device Functionality: TRANSMITTERS/RECEIVERS
Orderable Devices: SN55121J, SNJ55121FK, SNJ55121J, SN75121D, SN75121N

View the complete PDF datasheet: slls074c.pdf (118 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN55121, SN75121

Go to the Engineering Design Center to locate information on other TI Semiconductor devices.