March 1997

Revised March 1999

© 1999 Fairchild Semiconductor Corporation

DS500002.prf

www.fairchildsemi.com

74VHCT240A

Octal Buffer/Line Driver with 3-STATE Outputs

General Description

The VHCT240A is an advanced high speed CMOS octal

bus transceiver fabricated with silicon gate CMOS technol-

ogy. It achieves high speed operation similar to equivalent

Bipolar Schottky TTL while maintaining the CMOS low

power dissipation. The VHCT240A is an inverting 3-STATE

buffer having two active-LOW output enables. This device

is designed to be used as 3-STATE memory address driv-

ers, clock drivers, and bus oriented transmitter/receivers.

Protection circuits ensure that 0V to 7V can be applied to

the input and output (Note 1) pins without regard to the

supply voltage. These circuits prevent device destruction

due to mismatched supply and input/output voltages. This

device can be used to interface 5V to 3V systems and two

supply systems such as battery back up.

Note 1: Outputs in OFF-State

Features

s Power down protection is provided on inputs and

outputs

s Pin and function compatible with 74HCT240

Ordering Code:

Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.

Logic Symbol

IEEE/IEC

Connection Diagram

Pin Descriptions

Order Number

Package Number

Package Description

74VHCT240AM

M20B

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

74VHCT240ASJ

M20D

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

74VHCT240AMTC

MTC20

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

74VHCT240AN

N20A

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

Pin Names

Description

3-STATE Output Enable

Inputs

Outputs 3-STATE Outputs