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CD4029BM Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer CD4029BM
Beschreibung Presettable Binary/Decade Up/Down Counter
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 8 Seiten
CD4029BM Datasheet, Funktion
February 1988
CD4029BM CD4029BC Presettable
Binary Decade Up Down Counter
General Description
The CD4029BM CD4029BC is a presettable up down
counter which counts in either binary or decade mode de-
pending 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 asynchro-
nously with the clock The counter is advanced one count at
the positive-going edge of the clock if the carry in and pre-
set enable inputs are at logical ‘‘0’’ Advancement is inhibit-
ed 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
Y Wide supply voltage range
3V to 15V
Y High noise immunity
Y Low power
TTL compatibility
0 45 VDD (typ )
fan out of 2
driving 74L
or 1 driving 74LS
Y Parallel jam inputs
Y Binary or BCD decade up down counting
Logic Diagram
C1995 National Semiconductor Corporation TL F 5960
TL F 5960 – 1
RRD-B30M105 Printed in U S A






CD4029BM Datasheet, Funktion
Switching Time Waveforms
Cascading Packages
Parallel Clocking
TL F 5960 – 5
Ripple Clocking
TL F 5960 – 6
TL F 5960 – 7
Carry out lines at the 2nd or later stages may have a negative-going spike due to differential internal delays These spikes do not
affect counter operation but if the carry out is used to trigger external circuitry the carry out should be gated with the clock
6

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