Quad Tri-state Buffers - National SemiconductorThis device DM54125 DM74125 contains four independent Gates each of which
performs a non-inverting Buffer function. The outputs have
the TRI-STATE feature. When enabled, the outputs exhibit
the low impedance characteristics of a standard TTL output
with additional drive capability at the high Logic level to per-
mit the driving of bus lines without external pull-up resistors.
When disabled, both the output Transistors are turned off
presenting a high-impedance state to the bus line. Thus the
output will act neither as a significant load nor as a driver. To minimize the possibility that two outputs will attempt to
take a common bus to opposite Logic levels, the disable time
is shorter than the enable time of the outputs. By National Semiconductor Corporation
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