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MC74ACT640DWR2 bảng dữ liệu(PDF) 1 Page - ON Semiconductor

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© Semiconductor Components Industries, LLC, 2006
December, 2006 − Rev. 3
1
Publication Order Number:
MC74ACT640/D
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*
19
20
18
16
15
14
2
1
3
4567
VCC
13
8
12
9
11
10
OE
B0
B1
B2
B3
B4
B5
B6
B7
T/R
A0
A1
A2
A3
A4
A5
A6
A7
GND
17
Figure 1. Pinout: 20−Lead Packages Conductors
(Top View)
PIN ASSIGNMENT
PIN
FUNCTION
A0−A7
Side A Inputs or 3-State Outputs
OE
Output Enable Input
T/R
Transmit/Receive Input
B0−B7
Side B Inputs or 3-State Outputs
TRUTH TABLE
OE
T/R
Applied
Inputs
Valid
Direction
I/P
→O/P
Output
H
X
X
X
X
L
H
H
A to B
L
L
H
L
A to B
H
L
L
H
B to A
L
L
L
L
B to A
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
*For additional information on our Pb−Free strategy and soldering details, please
download the ON Semiconductor Soldering and Mounting Techniques
Reference Manual, SOLDERRM/D.
See general marking information in the device marking
section on page 4 of this data sheet.
DEVICE MARKING INFORMATION
http://onsemi.com
SOIC−20W
DW SUFFIX
CASE 751D
SOEIAJ−20
M SUFFIX
CASE 967
1
1
PDIP−20
N SUFFIX
CASE 738
1
†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
Package
Shipping
ORDERING INFORMATION
MC74ACT640N
PDIP−20
18 Units/Rail
MC74ACT640NG
PDIP−20
(Pb−Free)
18 Units/Rail
MC74ACT640DW
SOIC−20
38 Units/Rail
MC74ACT640DWG
SOIC−20
(Pb−Free)
38 Units/Rail
MC74ACT640DWR2
SOIC−20
1000 / Tape &
Reel
MC74ACT640DWR2G
SOIC−20
(Pb−Free)
1000 / Tape &
Reel
MC74ACT640MEL
SOEIAJ−20 2000 / Tape &
Reel
MC74ACT640MELG
SOEIAJ−20
(Pb−Free)
2000 / Tape &
Reel


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