BTF1A

Data Sheet March 2001 Dual Differential Transceiver BTF1A With Idle Bus Indicator Features Driver Features s s s s s Electrostatic discharge (ESD) performance better than the 41 Series Lower power requirement than the 41 Series s Produces a logic zero in third state 400 mV difference voltage in third state Two line drivers per package Logic to convert TTL input logic levels to differential, pseudo-emmiter coupled logic (ECL) output logic levels No line loading when VCC = 0 V High output driver for 50 Ω loads 200 mA short-circuit current (typical) 2.0 ns maximum propagation delay <0.2 ns output skew (typical) Description The BTF1A device is a dual differential transceiver circuit that transmits and receives digital data over balanced transmission lines and is compatible with Lucent Technologies Microelectronics Group differential drivers and receivers. It is designed to provide a strong logic zero when in the third state. The minimum difference voltage in the third state is 400 mV. It is designed specifically for bus applications where a well-defined logic state is needed when the bus is idle. The driver puts out a logic zero when in the third state mode, which is easily overriden by an active buffer on the bus. When all the buffers on the bus are inactive (third state), the signal on the bus is a zero indicating that the bus is idle. The dual drivers translate input TTL logic levels to differential pseudo-ECL output levels. The dual receiver converts differential input...