74HC191 查看數據表（PDF） - Philips Electronics
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74HC191 Datasheet PDF : 14 Pages
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Philips Semiconductors
Presettable synchronous 4-bit binary
up/down counter
Sequence
Load (preset) to binary thirteen;
count up to fourteen, fifteen,
zero, one and two;
inhibit;
count down to one, zero, fifteen,
fourteen and thirteen.
Fig.8 Typical load, count and
inhibit sequence.
Product specification
74HC/HCT191
December 1990
Fig.9 Logic diagram.
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