74HC191U View Datasheet(PDF) - Philips Electronics

Part Name

Description

MFG CO.

74HC191U

Presettable synchronous 4-bit binary up/down counter

Philips Electronics 

Philips Semiconductors

Presettable synchronous 4-bit binary

up/down counter

Product specification

74HC/HCT191

PIN DESCRIPTION

PIN NO.

3, 2, 6, 7

4

5

8

11

12

13

14

15, 1, 10, 9

16

SYMBOL

Q0 to Q3

CE

U/D

GND

PL

TC

RC

CP

D0 to D3

VCC

NAME AND FUNCTION

flip-flop outputs

count enable input (active LOW)

up/down input

ground (0 V)

parallel load input (active LOW)

terminal count output

ripple clock output (active LOW)

clock input (LOW-to-HIGH, edge triggered)

data inputs

positive supply voltage

Fig.1 Pin configuration.

Fig.2 Logic symbol.

Fig.3 IEC logic symbol.

December 1990

4

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