SN74LVC8T245-EP - Enhanced Product 8-Bit Dual-Supply Bus Transc. w/ Configurable Voltage Transl., and 3-State Outputs

This 8-bit noninverting bus transceiver uses two separate configurable power-supplyrails. The SN74LVC8T245-EP is optimized to operate with V_CCA andV_CCB set at 1.65 V to 5.5 V. The A port is designed to trackV_CCA. V_CCA accepts any supply voltage from 1.65 V to5.5 V. The B port is designed to track V_CCB. V_CCBaccepts any supply voltage from 1.65 V to 5.5 V. This allows for universal low-voltagebidirectional translation between any of the 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes.

The SN74LVC8T245-EP is designed for asynchronous communication between two data buses.The logic levels of the direction-control (DIR) input and the output-enable(OE) input activate either the B-port outputs or the A-port outputs or placeboth output ports into the high-impedance mode. The device transmits data from the A bus to the Bbus when the B-port outputs are activated, and from the B bus to the A bus when the A-port outputsare activated. The input circuitry on both A and B ports is always active and must have a logicHIGH or LOW level applied to prevent excess I_CC andI_CCZ.

The SN74LVC8T245-EP is designed so that the control pins (DIR andOE) are supplied by V_CCA.

This device is fully specified for partial-power-down applications usingI_off. The I_off circuitry disables the outputs,preventing damaging current backflow through the device when it is powered down.

The V_CC isolation feature ensures that if eitherV_CC input is at GND, all outputs are in the high-impedance state.

To ensure the high-impedance state during power up or power down,OE should be tied to V_CC through a pullup resistor;the minimum value of the resistor is determined by the current-sinking capability of thedriver.

• Control Inputs V_IH/V_IL Levels Are Referenced to V_CCA Voltage
• V_CC Isolation Feature – If Either V_CC Input Is at GND, All Are in the High-Impedance State
• Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.65-V to 5.5-V Power-Supply Range
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22
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