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MC74ACT245 Datasheet PDF : 10 Pages
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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
OE
T/R
A0−A7
B0−B7
FUNCTION
Output Enable Input
Transmit/Receive Input
Side A 3−State Inputs or 3−State Outputs
Side B 3−State Inputs or 3−State Outputs
TRUTH TABLES
Inputs
OE T/R
Outputs
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
http://onsemi.com
1
1
PDIP−20
N SUFFIX
CASE 738
SOIC−20W
DW SUFFIX
CASE 751D
TSSOP−20
DT SUFFIX
CASE 948E
1
SOEIAJ−20
M SUFFIX
CASE 967
1
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
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.
© Semiconductor Components Industries, LLC, 2006
1
November, 2006 − Rev. 7
Publication Order Number:
MC74AC245/D
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