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Tri-state capability is added to a large swing low voltage inverter (LVI) driver-receiver circuit by a relatively minor reconnection of the existing devices.
English (United States)
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Tri-State LVI Driver
Tri-state capability is added to a large swing low voltage inverter (LVI) driver-
receiver circuit by a relatively minor reconnection of the existing devices.
The prior LVI circuit is shown in Fig. l and is characterized by grounded
emitters in output pull-down transistors TOD and TTS as well as by resistors Rl
and R2 in the base circuits thereof to enable higher peak-to-peak output swings.
By disconnecting the collector of transistor TTS from the output terminal and
connecting it instead to the base of transistor TOD, as shown in Fig. 2, the input
B becomes the "enable" input for the tri- state output condition. If input B is at an
up level, T2 and TTS are both ON and TOD is OFF. Resistor RL is large enough
to assure that TOU can not turn on (an up level at input A assures TOU is OFF).
Thus, the output is in a high impedance state.
If input B is at a low level, T2 and TTS are both OFF and the driver is
controlled only by input A.
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