PI74LVTC245

Pericom Semiconductor's PI74LVTC series of logic circuits areproduced using the Company's advanced CMOS technology, achiev-ing industry leading speed.

The PI74LVTC245 is a non-inverting 8-bit Bidirectional Transceiverdesigned for low-voltage 2.7V to 3.6V VCC operation, with thecapability of interfacing to the 5V system environment. This tranceiveris designed for asynchronous two-way communication betweendata buses. The direction control input pin (DIR) determines thedirection of the dataflow from the A bus to theB bus or from the B bus to the A bus. The output of PI74LVTC245 enable (OE) input,when HIGH, disables both A and B ports by placing them inHIGH Z condition.

When Vcc is between 0 to 1.5V during power up or power down, theoutputs of the PI74LVTC245 are in the high-impedance state. To ensure thehigh-impedance state above 1.5V, OE should be tied to VCC througha pullup resistor; the minimum value of the resistor is determined bythe current sinking capability of the driver.

The PI74LVTC245 fully supports live-insertion with its Ioff and power-up/down 3-state. The Ioff circuitry disables the outputs when the poweris off, preventing the backflow of damaging current through the PI74LVTC245. Power-up/down 3-state places the outputs in thehigh-impedance state during power up or power down, preventingdriver conflict.