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
http://onsemi.com
PDIP−20
N SUFFIX
CASE 738
1
•
•
•
•
•
Noninverting Buffers
Bidirectional Data Path
A and B Outputs Source/Sink 24 mA
′ACT245
has TTL Compatible Inputs
Pb−Free Packages are Available
SOIC−20W
DW SUFFIX
CASE 751D
1
PIN ASSIGNMENT
PIN
OE
T/R
A
0
−A
7
B
0
−B
7
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
1
Outputs
1
TSSOP−20
DT SUFFIX
CASE 948E
TRUTH TABLES
Inputs
OE
L
L
H
T/R
L
H
X
SOEIAJ−20
M SUFFIX
CASE 967
ORDERING INFORMATION
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
See detailed ordering and shipping information in the package
dimensions section on page 6 of this data sheet.
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 7 of this data sheet.
V
CC
20
OE
19
B
0
18
B
1
17
B
2
16
B
3
15
B
4
14
B
5
13
B
6
12
B
7
11
1
T/R
2
A
0
3
A
1
4
A
2
5
A
3
6
A
4
7
A
5
8
A
6
9
A
7
10
GND
Figure 1.
©
Semiconductor Components Industries, LLC, 2006
1
November, 2006 − Rev. 7
Publication Order Number:
MC74AC245/D
ONSEMI [ ON SEMICONDUCTOR ]
