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MC74AC640DWR2 Datasheet PDF : 8 Pages
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MC74ACT640
Octal 3-State Inverting
Transciever1
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.
• Bidirectional Data Path
• A and B Outputs Sink 24 mA/Source –24 mA
• TTL Compatible Inputs
VCC OE B0 B1 B2 B3 B4 B5 B6 B7
20 19 18 17 16 15 14 13 12 11
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
http://onsemi.com
20
1
20
1
20
1
PDIP–20
N SUFFIX
CASE 738
SO–20
DW SUFFIX
CASE 751
TSSOP–20
DT SUFFIX
CASE 948E
20
1
EIAJ–20
M SUFFIX
CASE 967
ORDERING INFORMATION
Device
Package
Shipping
MC74ACT640N
PDIP–20 18 Units/Rail
MC74ACT640DW SOIC–20 38 Units/Rail
MC74AC640DWR2 SOIC–20 1000 Tape & Reel
MC74AC640DT
TSSOP–20 75 Units/Rail
MC74ACT640DTR2 TSSOP–20 2500 Tape & Reel
MC74ACT640M
EIAJ–20 40 Units/Rail
MC74AC640MEL
EIAJ–20 2000 Tape & Reel
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 5 of this data sheet.
© Semiconductor Components Industries, LLC, 2001
1
June, 2001 – Rev. 1
Publication Order Number:
MC74ACT640/D
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