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HD74HC444

Hitachi Semiconductor
Part Number HD74HC444
Manufacturer Hitachi Semiconductor
Description (HD74HC442 - HD74HC444) Quad. Tridirectional Bus Transceiver(with noninverted/inverted 3-state outputs)
Published Jan 11, 2007
Detailed Description HD74HC442/HD74HC443/HC74HC444 Quad. Tridirectional Bus Transceiver (with noninverted 3-state outputs) Quad. Tridirection...
Datasheet PDF File HD74HC444 PDF File

HD74HC444
HD74HC444

Overview
HD74HC442/HD74HC443/HC74HC444 Quad.
Tridirectional Bus Transceiver (with noninverted 3-state outputs) Quad.
Tridirectional Bus Transceiver (with inverted 3-state outputs) Quad Tridirectional Bus Transceiver (with noninverted/inverted 3-state outputs) Description These bus transceivers are designed for a synchronous three-way communication between four-line data buses.
They give the designer a choice of selecting inverting, noninverting or a combination of inverting and noninverting data paths with 3-state outputs.
The S 0 and S1 inputs select the bus from which data are to be transferred.
The G inputs enable the bus or buses to which data are to be transferred.
The port for any bus selected for input and any other bus not enabled for output will be at high impedance.
Features • • • • • High Speed Operation High Output Current: Fanout of 15 LSTTL Loads Wide Operating Voltage: VCC = 2 to 6 V Low Input Current: 1 µA max Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C) HD74HC442/HD74HC443HD74HC444 Function Table Inputs CS H X X X X X L L L L L L L L L S1 X H X L L H L L H L L H L L H S0 X H X L H L L H L L H L L H L GA X X H X H H X L L X H L X L H GB X X H H X H L X L L X H H X L GC X X H H H X L L X H L X L H X Transfers Between Buses HD74HC442 None None None None None None A → B, A → C B → C, B → A C → A, C → B A→B B→C C→A A→C B→A C→B HD74HC443 None None None None None None A → B, A → C B → C, B → A C → A, C → B A→B B→C C→A A→C B→A C→B HD74HC444 None None None None None None A → B, A → C B → C, B → A C → A, C → B A→B B→C C→A A→C B→A C→B 2 HD74HC442/HD74HC443/HD74HC444 Pin Arrangement CS 1 B1 2 C1 3 C2 4 B2 5 B3 6 C3 7 C4 8 B4 9 GND 10 (Top view) 20 VCC 19 GC 18 GB 17 GA 16 A1 15 A2 14 A3 13 A4 12 S1 11 S0 Absolute Maximum Ratings Item Supply voltage range Input voltage Output voltage Output current DC current drain per VCC GND DC input diode current DC output diode current Power Dissipation per package Storage temperature Symbol VCC VIN VOUT ...


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