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Two arrangements of a circuit which allows a push-pull driver to be dottable are represented in Figs. 1A and 1B, wherein elements having the same functions have the same references.
English (United States)
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Dottable Push Pull Driver
Two arrangements of a circuit which allows a push-pull driver to be dottable
are represented in Figs. 1A and 1B, wherein elements having the same functions
have the same references.
The push-pull driver comprises transistors T3, T4, T5 and T6. To make the
output of the driver dottable, the following condition has to be met: if the output is
at an UP level, transistors T5 and T4 have to become OFF when the output is
forced at a DOWN level, through transistor TD of another driver.
In this condition, transistor T2 becomes ON when the output level goes under
a threshold voltage, which can be adjusted through resistors R1 and R2 (Fig. 1A)
or resistor R1 and diode T7 (Fig. 1B). This causes transistors T4 and T5 to be
OFF, and a very low current is fed to transistor TD.
When the levels on inputs terminals A and B are UP, the output is at a down
level so that transistor T2 is OFF and does not disturb the operation of the driver.
With the arrangement represented on Figs. 1A and 1B, the output of the
driver may be considered as a high impedance as soon as transistor T2 begins
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