TECHNICAL DATA
IN74ACT643
Octal 3-State Bus Transceiver
High-Speed Silicon-Gate CMOS
The IN74ACT643 is identical in pi...
TECHNICAL DATA
IN74ACT643
Octal 3-State Bus Transceiver
High-Speed Silicon-Gate
CMOS
The IN74ACT643 is identical in pinout to the LS/ALS643, HC/HCT643. The IN74ACT623 may be used as a level converter for interfacing TTL or NMOS outputs to High Speed
CMOS inputs. The IN74ACT643 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. TTL/NMOS Compatible Input Levels Outputs Directly Interface to
CMOS, NMOS, and TTL Operating
Voltage Range: 4.5 to 5.5 V Low Input Current: 1.0 µA; 0.1 µA @ 25°C Outputs Source/Sink 24 mA
ORDERING INFORMATION IN74ACT643N Plastic IN74ACT643DW SOIC TA = -40° to 85° C for all packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Control Inputs Output Enable L PIN 20=VCC PIN 10 = GND Direction L Operation Data Transmitted from Bus B to Bus A 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
H
X
X = don’t care
1
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IN74ACT643
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 Current, per Pin DC Supply Current, VCC and GND ...
