© 2005 Fairchild Semiconductor Corporation

DS011520

www.fairchildsemi.com

November 1992

Revised April 2005

74VHC245

Octal Bidirectional Transceiver with 3-STATE Outputs

General Description

The VHC245 is an advanced high speed CMOS octal bus

transceiver fabricated with silicon gate CMOS technology.

It achieves high speed operation similar to equivalent Bipo-

lar Schottky TTL while maintaining the CMOS low power

dissipation. The VHC245 is intended for bidirectional asyn-

chronous communication between data busses. The direc-

tion of data transmission is determined by the level of the

T/R input. The enable input can be used to disable the

device so that the busses are effectively isolated. All inputs

are equipped with protection circuits against static dis-

charge.

Features

s Power Down Protection is provided on all inputs

s Low Power Dissipation:

s Pin and Function Compatible with 74HC245

Ordering Code:

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

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

Logic Symbol

IEEE/IEC

Pin Description

Connection Diagram

Truth Table

H

HIGH Voltage Level

L

LOW Voltage Level

X

Immaterial

Any unused bus terminals during HIGH-Z State must be held HIGH or

LOW.

Order Number

Package Number

Package Description

74VHC245M

M20B

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

74VHC245SJ

M20D

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

74VHC245MTC

MTC20

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

74VHC245N

N20A

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

Pin

Description

Names

OE

Output Enable Input

T/R

Transmit/Receive Input

Side A Inputs or 3-STATE Outputs

Side B Inputs or 3-STATE Outputs

Inputs

Outputs

OE

T/R

L

L

Bus B Data to Bus A

L

H

Bus A Data to Bus B

H

X

HIGH-Z State