TLF8442

August 1989

54LS244DM74LS244 Octal TRI-STATE

BuffersLine DriversLine Receivers

General Description

These buffersline drivers are designed to improve both the

performance and PC board density of TRI-STATE buffers

drivers employed as memory-address drivers clock drivers

and bus-oriented transmittersreceivers Featuring 400 mV

of hysteresis at each low current PNP data line input they

provide improved noise rejection and high fanout outputs

and can be used to drive terminated lines down to 133X

Features

Y

TRI-STATE outputs drive bus lines directly

Y

PNP inputs reduce DC loading on bus lines

Y

Hysteresis at data inputs improves noise margins

Y

54LS

12 mA

74LS

24 mA

Y

54LS

b

12 mA

74LS

b

15 mA

Y

Typical propagation delay times

Inverting

105 ns

Noninverting

12 ns

Y

Typical enabledisable time 18 ns

Y

Typical power dissipation (enabled)

Inverting

130 mW

Noninverting

135 mW

Connection Diagram

Dual-In-Line Package

TLF8442 – 1

Order Number 54LS244DMQB 54LS244FMQB 54LS244LMQB

DM74LS244WM or DM74LS244N

See NS Package Number E20A J20A M20B N20A or W20A

Function Table

Inputs

Output

G

AY

LL

L

LH

H

HX

Z

TRI-STATE

is a registered trademark of National Semiconductor Corporation

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A