Voltage Translation with Direction-Control

GT74LVC4T245

This 4-bit noninverting bus transceiver uses two separate power-supply rails. The GT74LVC4T245 is optimized to operate with VCCA and VCCB set at 1.65V to 5.5V. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.65V to 5.5V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65V to 5.5V. This allows for universal low-voltage bidirectional translation between any of the 1.8V, 2.5V, 3.3V, and 5.5V voltage nodes. The logic levels of the direction-control (DIR) input and the output-enable (OEB) input activate either the B-port outputs or the A-port outputs or place both output ports into the high-impedance mode. The device transmits data from the A bus to the B bus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputs are activated. The input circuitry on both A and B ports is always active and have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ. The GT74LVC4T245 is designed so that the control pins are supplied by VCCA.

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