MC74ACT640 Datasheet, PDF (1/6 Pages) ON Semiconductor – Octal 3−State Inverting Transciever

MC74ACT640
Octal 3−State Inverting
Transciever
The MC74ACT640 octal bus transceiver is designed for
asynchronous two-way communication between data buses. The
device transmits data from bus A to bus B when T/R = HIGH, or from
bus B to bus A when T/R = LOW. The enable input can be used to
disable the device so the buses are effectively isolated.
Features
• Bidirectional Data Path
• A and B Outputs Sink 24 mA/Source −24 mA
• TTL Compatible Inputs
• Pb−Free Packages are Available*
V_CC OE B₀ B₁ B₂ B₃ B₄ B₅ B₆ B₇
20 19 18 17 16 15 14 13 12 11
http://onsemi.com
1
1
PDIP−20
N SUFFIX
CASE 738
SOIC−20W
DW SUFFIX
CASE 751D
1
2
3
4
5
6
7
8
9 10
T/R A₀ A₁ A₂ A₃ A₄ A₅ A₆ A₇ GND
Figure 1. Pinout: 20−Lead Packages Conductors
(Top View)
PIN ASSIGNMENT
PIN
FUNCTION
A₀−A₇
OE
Side A Inputs or 3-State Outputs
Output Enable Input
T/R
Transmit/Receive Input
B₀−B₇
Side B Inputs or 3-State Outputs
TRUTH TABLE
OE
T/R
H
X
L
H
L
H
L
L
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Applied
Inputs
X
H
L
H
L
Valid
Direction
I/P→O/P
X
A to B
A to B
B to A
B to A
Output
X
L
H
L
H
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
© Semiconductor Components Industries, LLC, 2006
1
December, 2006 − Rev. 3
SOEIAJ−20
M SUFFIX
CASE 967
1
ORDERING INFORMATION
Device
Package Shipping^†
MC74ACT640N
PDIP−20 18 Units/Rail
MC74ACT640NG
MC74ACT640DW
PDIP−20
(Pb−Free)
SOIC−20
18 Units/Rail
38 Units/Rail
MC74ACT640DWG
SOIC−20 38 Units/Rail
(Pb−Free)
MC74ACT640DWR2 SOIC−20 1000 / Tape &
Reel
MC74ACT640DWR2G SOIC−20 1000 / Tape &
(Pb−Free)
Reel
MC74ACT640MEL
SOEIAJ−20 2000 / Tape &
Reel
MC74ACT640MELG SOEIAJ−20 2000 / Tape &
(Pb−Free)
Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 4 of this data sheet.
Publication Order Number:
MC74ACT640/D