M54HC640 Datasheet PDF | STMicroelectronics

STMicroelectronics M54HC640

The M54/74HC245, HC640 and HC643 utilise silicon gate C2MOS technology to achive operating speeds equivalent to LSTTL devices. These IC’s are intended for two-way asynchronous communication between data buses, and the direction of data trasmission is determined by DIR input. The enable input (G) can be used to disable the device so that the buses are effectively isolated.

Part No.	M54HC640
Datasheet	M54HC640 Download
Manufacturer	STMicroelectronics
Description	OCTAL BUS TRANSCEIVER
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DESCRIPTION

Along with the low power dissipation and high noise 2 immunity of standards C MOS integrated circuit, it possesses the capability to drive 15 LSTTL loads. PIN CONNECTION (top view) HC245 HC640 HC643 All input are equipped with protection circuits against static discharge and transient discharge and transient excess voltage. IT IS PROHIBITED TO APPLY A SIGNAL TO A BUS TERMINAL WHEN IT IS IN OUTPUT MODE AND WHEN A BUS THERMINAL IS FLOATING (HIGH IMPEDANCE STATE), IT IS REQUESTED TO FIX THE INPUT LEVEL BY MEANS OF EXTERNAL PULL DOWN OR PULL UP RESISTOR. October 1993 1/11 M54/M74HC245/640/643 INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN

DESCRIPTION

PIN No 1 2, 3, 4, 5, 6, 7, 8, 9 18, 17, 16, 15, 14, 13, 12, 11 19 10 20 SYMBOL DIR A1 to A8 B1 to B8 NAME AND FUNCTION Directional Control Data Inputs/Outputs Data Inputs/Outputs G GND VCC Output Enabel Input (Active LOW) Ground (0V) Positive Supply Voltage IEC LOGIC SYMBOLS HC245 HC640 HC643 TRUTH TABLE INPUT G L L H X: ”H” or ”L” Z: Hig...