? 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
A
0
?A
7
Side A 3?State Inputs or 3?State Outputs
B
0
?B
7
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.
1920 18 17 16 15 14
21 34567
V
CC
13
8
12
9
11
10
OE B
0
B
1
B
2
B
3
B
4
B
5
B
6
B
7
T/R A
0
A
1
A
2
A
3
A
4
A
5
A
6
A
7
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
