DM54LS491 datasheet(1/4 Pages) NSC

部件名	DM54LS491

功能描述	10-Bit Counter

PDF	4 Pages

Scroll/Zoom	100%

制造商	NSC [National Semiconductor (TI)]

网页	http://www.national.com

标志

1 / 4 page

TLL8332

July 1989

DM54LS49174LS491 10-Bit Counter

General Description

The ten-bit counter can count up count down set and load

2 LSB’s 2 MSB’s and 6 middle bits high or low as a group

All operations are synchronous with the clock SET over-

rides LOAD COUNT and HOLD LOAD overrides COUNT

COUNT is conditional on CIN otherwise it holds

All outputs are enabled when OE is low otherwise HIGH-Z

The 24 mA IOL outputs are suitable for driving RAMPROM

address lines in video graphics systems

FeaturesBenefits

Y

CRT vertical and horizontal timing generation

Y

Bus-structured pinout

Y

24-pin SKINNYDIP saves space

Y

TRI-STATE

outputs drive bus lines

Y

Low current PNP inputs reduce loading

Connection Diagram

Top View

TLL8332 – 1

Order Number DM54LS491J

DM74LS491J or DM74LS491N

See NS Package Number J24F or N24C

Standard Test Load

TLL8332 – 2

Function Table

OE CK SET LD CNT CIN UP D9-D0 Q9-Q0

Operation

H

X

Z

Hi-Z

L

u H X X

X

H

Set all HIGH

L

u L L

X

D

LOAD D

L

u L H H

X

Q

HOLD

L

u L H L

H

X

Q

HOLD

L

u L H L

L

X

Q plus 1 Count UP

L

u L H L

L

H

X

Q minus 1 Count DN

TRI-STATE

is a registered trademark of National Semiconductor Corp

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A

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