74HCT193DB 查看數據表（PDF） - Philips Electronics

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74HCT193DB

Presettable synchronous 4-bit binary up/down counter

Philips Electronics 

Philips Semiconductors

Presettable synchronous 4-bit binary

up/down counter

Product specification

74HC/HCT193

(1) Clear overrides load, data and

count inputs.

(2) When counting up the count down

clock input (CPD) must be HIGH,

when counting down the count up

clock input (CPU) must be HIGH.

Sequence

Clear (reset outputs to zero);

load (preset) to binary thirteen;

count up to fourteen, fifteen,

terminal count up, zero, one

and two;

count down to one, zero,

terminal count down, fifteen,

Fig.5 Typical clear, load and count sequence.

December 1990

Fig.6 Logic diagram.

6

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