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Three State Push Pull Driver
This is a push-pull off-chip driver circuit.
As illustrated in the figure, when -V is at -2.3 volts, the circuit produces output
levels of -0.8 to -2 volts. Emitter follower T2 provides base drive for both T3 and
T5 through current-limiting resistors R3 and R5. Inverter T3 turns emitter
follower T4 off when T5 is on by providing an ample -2 volt down level at the
base of T4, thus eliminating crossover current spikes through the push-pull
drivers T4, T5.
When the inhibit inputs are driven to an up level, an open-circuit condition
(both T4 and T5 off) is produced at the output node to allow data busing.
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