© 2005 Fairchild Semiconductor Corporation

Ds009966

www.fairchildsemi.com

November 1988

Revised March 2005

74AC540

Octal Buffer/Line Driver with 3-STATE Outputs

General Description

The AC540 is an octal buffer/line drivers designed to be

employed as memory and address drivers, clock drivers

and bus oriented transmitter/receivers.

These devices are similar in function to the AC240 while

providing flow-through architecture (inputs on opposite side

from outputs). This pinout arrangement makes these

devices especially useful as output ports for microproces-

sors, allowing ease of layout and greater PC board density.

Features

■ 3-STATE inverting outputs

■ Inputs and outputs opposite side of package, allowing

easier interface to microprocessors

■ Output source/sink 24 mA

Ordering Code:

Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.

Pb-Free package per JEDEC J-STD-020B.

Logic Symbol

IEEE/IEC

Connection Diagram

Truth Table

H

HIGH Voltage Level

X

Immaterial

L

LOW Voltage Level

Z

High Impedance

FACT

¥ is a trademark of Fairchild Semiconductor Corporation.

Order Number

Package Number

Package Description

74AC540SC

M20B

20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide

74AC540SJ

M20D

Pb-Free 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide

74AC540MTC

MTC20

20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide

74AC540PC

N20A

20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide

Inputs

Outputs

I

LL

H

L

HXX

Z

XHX

Z

LLL

H