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© Semiconductor Components Industries, LLC, 2006
November, 2006 − Rev. 7
1
Publication Order Number:
MC74AC245/D
MC74AC245, MC74ACT245
Octal Bidirectional
Transceiver with 3−State
Inputs/Outputs
The MC74AC245/74ACT245 contains eight non−inverting
bidirectional buffers with 3−state outputs and is intended for
bus−oriented applications. Current sinking capability is 24 mA at both
the A and B ports. The Transmit/Receive (T/R) input determines the
direction of data flow through the bidirectional transceiver. Transmit
(active−HIGH) enables data from A ports to B ports; Receive
(active−LOW) enables data from B ports to A ports. The Output
Enable input, when HIGH, disables both A and B ports by placing
them in a High Z condition.
Features
Noninverting Buffers
Bidirectional Data Path
A and B Outputs Source/Sink 24 mA
′ACT245 has TTL Compatible Inputs
Pb−Free Packages are Available
PIN ASSIGNMENT
PIN
FUNCTION
OE
Output Enable Input
T/R
Transmit/Receive Input
A0−A7
Side A 3−State Inputs or 3−State Outputs
B0−B7
Side B 3−State Inputs or 3−State Outputs
TRUTH TABLES
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
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Figure 1.
19
20
18
17
16
15
14
2
1
34567
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
http://onsemi.com
SOIC−20W
DW SUFFIX
CASE 751D
TSSOP−20
DT SUFFIX
CASE 948E
SOEIAJ−20
M SUFFIX
CASE 967
1
1
1
PDIP−20
N SUFFIX
CASE 738
1
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
ORDERING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
DEVICE MARKING INFORMATION


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