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Informatie

Description

The CD4029BM/CD4029BC is a presettable up/down
counter which counts in either binary or decade mode depending
on the voltage level applied at binary/decade input.
When binary/decade is at logical ``1'', the counter counts in
binary, otherwise it counts in decade. Similarly, the counter
counts up when the up/down input is at logical ``1'' and vice
versa.
A logical ``1'' preset enable signal allows information at the
``jam'' inputs to preset the counter to any state asynchronously
with the clock. The counter is advanced one count at
the positive-going edge of the clock if the carry in and preset
enable inputs are at logical ``0''. Advancement is inhibited
when either or both of these two inputs is at logical ``1''.
The carry out signal is normally at logical ``1'' state and goes
to logical ``0'' state when the counter reaches its maximum
count in the ``up'' mode or the minimum count in the ``down''
mode provided the carry input is at logical ``0'' state.
All inputs are protected against static discharge by diode
clamps to both VDD and VSS.

Features

Wide supply voltage range 3V to 15V
High noise immunity 0.45 VDD (typ.)
Low power fan out of 2 TTL compatibility driving 74L
or 1 driving 74LS
Parallel jam inputs
Binary or BCD decade up/down counting 74LS


Binary or BCD decade up/down counting 74LS

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