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This is a multiple input NOR logic receiver circuit featuring current-limited inputs to prevent current hogging of the driver circuit.
English (United States)
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Schottky Transistor Logic Circuit Receiver
This is a multiple input NOR logic receiver circuit featuring current-limited
inputs to prevent current hogging of the driver circuit.
Inputs are received at terminals IN 1, 2, 3, and 4 for low forward voltage drop
Schottky barrier diodes D1, D2, D3, and D4, respectively. Low forward voltage
drop Schottky barrier diodes normally have a forward voltage drop in the order of
285 millivolts. The input signal is then applied to the collector of transistor T1,
which has its emitter connected to the base of transistor T3. The outputs are
supplied through the collector of T3 to the fan-out terminals OUT 1, 2, 3 and 4
through low forward voltage drop Schottky barrier diodes D6, D7, D8, and D9,
respectively. The collector DOT connections may be made by the terminal
The base of transistor T1 is connected to the base and collector of diode-
connected transistor T2, which is in series with Schottky barrier diode D5
connected to the collector of T3. Diode D5, a high forward voltage drop diode
having a forward voltage drop in the order of 600 millivolts, clamps the base node
of transistor T1 at a level which prevents saturation of transistor T3. This also
limits the current flowing into the input diodes D1, D2, D3 and D4 by controlling
the base current and, in turn, the collector current of transistor T1 to the minimum
requirements of transistor 3 base current and the current through resistor R1.