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Shown in the drawing is ah octal bus driver packaged on one silicon chip so that a high level of integration is attained.
English (United States)
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Transistor - Transistor Logic Bus Driver
Shown in the drawing is ah octal bus driver packaged on one silicon chip so
that a high level of integration is attained.
The octal driver comprises eight identical circuits 1 to 8 with data inputs IN1
to IN8 and outputs OUT1 to OUT8. Only circuit 1 is represented in details in the
Each circuit 1 to 8 is a power logic gate having a transfer characteristic VOUT
versus VIN compatible with T2L (transistor-transistor logic) circuitry.
Circuit 1 comprises a PNP input stage T1 and resistor R1 which provides on
output OUT1, the inverted input data (IN1) when circuit 1 is enabled, i.e., when
transistor T4 is turned OFF through the control signal DIS/ENA on line 9. When
circuit 1 is disabled, transistor T4 is turned ON and the output level on terminal
OUT1 is low whatever the data level on terminal IN1 may be.
When the input level on IN1 is high, transistor T2 is ON so that transistor T3
is ON. Transistor T3 is maintained at the limit of the saturation region through
diodes D1 to D3 and voltage divider R2 and R3.
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