SN55121 drivers equivalent, dual line drivers.
Output short-circuit protection is provided by an internal clamping network that turns on when the output voltage drops.
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.
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