TECHNICAL DATA
IN74AC245
Octal 3-State Noninverting
Bus Transceiver
High-Speed Silicon-Gate CMOS
The IN74AC245 is identical in pinout to the LS/ALS245,
HC/HCT245. The device inputs are compatible with standard CMOS
outputs; with pullup resistors, they are compatible with LS/ALS
outputs.
The IN74AC245 is a 3-state noninverting transceiver that is used
for 2-way asynchronous communication between data buses. The
device has an active-low Output Enable pin, which is used to place the
I/O ports into high-impedance states. The Direction control determines
whether data flows from A to B or from B to A.
ORDERING INFORMATION
IN74AC245N Plastic
IN74AC245DW SOIC
TA = -40° to 85° C for all
packages
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•
•
•
•
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2.0 to 6.0 V
Low Input Current: 1.0 µA; 0.1 µA @ 25°C
High Noise Immunity Characteristic of CMOS Devices
Outputs Source/Sink 24 mA
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Control Inputs
Output
Enable
Direction
L
Operation
L
Data Transmitted
from Bus B to
Bus A
L
H
X
Data Transmitted
from Bus A to
Bus B
PIN 20=VCC
PIN 10 = GND
H
Buses Isolated
(High Impedance
State)
X = don’t care
326
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