74HC191DB データシートの表示（PDF） - Philips Electronics

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74HC191DB

Presettable synchronous 4-bit binary up/down counter

Philips Electronics 

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.

7

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