74HC190 Просмотр технического описания (PDF) - Philips Electronics

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Компоненты Описание

производитель

74HC190

Presettable synchronous BCD decade up/down counter

Philips Electronics 

Philips Semiconductors

Presettable synchronous BCD decade

up/down counter

Product specification

74HC/HCT190

Fig.4 Functional diagram.

FUNCTION TABLE

OPERATING MODE

parallel load

count up

count down

hold (do nothing)

INPUTS

PL U/D

CE

CP

L

X

X

X

L

X

X

X

H

L

I

↑

H

H

I

↑

H

X

H

X

OUTPUTS

Dn

Qn

LL

HH

X count up

X count down

X no change

TC AND RC FUNCTION TABLE

INPUTS

U/D

CE

CP

H

H

X

L

H

X

L

L

L

H

X

H

H

X

H

L

TERMINAL COUNT STATE

Q0

Q1

Q2

Q3

H

X

X

H

H

X

X

H

H

X

X

H

L

L

L

L

L

L

L

L

L

L

L

L

Notes

1. H = HIGH voltage level

L = LOW voltage level

I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition

X = don’t care

↑ = LOW-to-HIGH CP transition

= one LOW level pulse

= TC goes LOW on a LOW-to-HIGH CP transition

OUTPUTS

TC

RC

L

H

H

H

L

H

H

H

December 1990

5

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