TECHNICAL DATA
Octal 3-State Inverting Bus Transceiver
High-Speed Silicon-Gate CMOS
The IN74AC640 is identical in pinou...
TECHNICAL DATA
Octal 3-State Inverting Bus Transceiver
High-Speed Silicon-Gate
CMOS
The IN74AC640 is identical in pinout to the LS/ALS640, HC/HCT640. The device inputs are compatible with standard
CMOS outputs; with pullup resistors, they are compatible with LS/ALS outputs. The IN74AC640 is a 3-state 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. Outputs Directly Interface to
CMOS, NMOS, and TTL Operating
Voltage Range: 2.0 to 6.0 V Low Input Current: 1.0 µA; o.1 µA @ 25°C High Noise Immunity Characteristic of
CMOS Devices Outputs Source/Sink 24 mA
IN74AC640
ORDERING INFORMATION IN74AC640N Plastic IN74AC640DW SOIC TA = -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Control Inputs Output Enable L Direction L Operation Data Transmitted from Bus B to Bus A (inverted) Data Transmitted from Bus A to Bus B (inverted) Buses Isolated (High Impedance State)
w
w
w
.d
e e h s a t a
. u t4
m o c
L
H
PIN 20=VCC PIN 10 = GND H X
X = don’t care
1
www.DataSheet4U.com
IN74AC640
MAXIMUM RATINGS*
Symbol VCC VIN VOUT IIN IOUT ICC PD Tstg TL
*
Parameter DC Supply
Voltage (Referenced to GND) DC Input
Voltage (Referenced to GND) DC Output
Voltage (Referenced to GND) DC Input Current, per Pin DC Output Sink/Source Cu...