IN74AC640

TECHNICAL DATA IN74AC640 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 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) L PIN 20=VCC PIN 10 = GND H H X X = don’t care 496 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 Current, per Pin DC Supply Current, VCC and GND Pins Power Dissi...