Catalog
Dual Line Drivers
Key Features
• Designed for Digital Data Transmission Over 50-Coaxial Cable, Strip Line, or Twisted PairHigh Speedtpd= 20 ns Maximum at CL= 15 pFTTL Compatible With Single 5-V Supply2.4-V Output at IOH= -75 mAUncommitted Emitter-Follower Output Structure for Party-Line OperationShort-Circuit ProtectionAND-OR Logic ConfigurationDesigned for Use With Triple Line Receivers SN55122, SN75122Designed to Be Interchangeable With Signetics N8T13Designed for Digital Data Transmission Over 50-Coaxial Cable, Strip Line, or Twisted PairHigh Speedtpd= 20 ns Maximum at CL= 15 pFTTL Compatible With Single 5-V Supply2.4-V Output at IOH= -75 mAUncommitted Emitter-Follower Output Structure for Party-Line OperationShort-Circuit ProtectionAND-OR Logic ConfigurationDesigned for Use With Triple Line Receivers SN55122, SN75122Designed to Be Interchangeable With Signetics N8T13
Description
AI
The SN55121 and SN75121 dual line drivers are designed for digital data transmission over lines having impedances from 50 to 500. 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
The SN55121 and SN75121 dual line drivers are designed for digital data transmission over lines having impedances from 50 to 500. 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
