74HC/HCT192 데이터 시트보기 (PDF) - Philips Electronics

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74HC/HCT192

Presettable synchronous BCD decade up/down counter

Philips Electronics 

Philips Semiconductors

Presettable synchronous BCD decade

up/down counter

Product specification

74HC/HCT192

FUNCTION TABLE

OPERATING MODE

reset (clear)

parallel load

count up

count down

INPUTS

OUTPUTS

MR PL CPU CPD D0 D1 D2 D3 Q0 Q1 Q2 Q3 TCU TCD

HXX L X X X X L L L L H L

HXX H X X X X L L L L H H

LLX L L L L L L L L L H L

LLX H L L L L L L L L H H

LLL X H X XH

LLH X H X XH

L H↑ H X X X X

Qn = Dn

Qn = Dn

count up

LH

HH

H(2) H

L HH ↑ X X X X

count down

H H(3)

Notes

1. H = HIGH voltage level

L = LOW voltage level

X = don’t care

↑ = LOW-to-HIGH clock transition

2. TCU = CPU at terminal count up (HLLH)

3. TCD = CPD at terminal count down (LLLL)

Fig.4 Functional diagram.

December 1990

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