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SN74LVC8T245PWR
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Datasheet
Description
Description for the SN74LVC8T245 The SN74LVC8T245 is an eight bit non-inverting bus transceiver with configurable dual power supply rails that enables bidirectional voltage level translation. The SN74LVC8T245 is optimized to operate with VCCA and VCCB set at 1.65 V to 5.5 V. The A port is designed to track VCCA. VCCA accepts any supply voltage from 1.65 V to 5.5 V. The B port is designed to track VCCB. VCCB accepts any supply voltage from 1.65 V to 5.5 V. This allows for universal low-voltage bidirectional translation between any of the 1.8-V, 2.5-V, 3.3-V, and 5.5-V voltage nodes. The SN74LVC8T245 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 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 must have a logic HIGH or LOW level applied to prevent excess ICC and ICCZ. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The VCC isolation feature ensures that if either VCC 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 VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. The SN74LVC8T245 is designed so that the control pins (DIR and OE) are supplied by VCCA Features for the SN74LVC8T245 Control inputs VIH/VIL levels are referenced to VCCA voltage VCC isolation feature – if either VCC 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 4000-V Human-Body Model (A114-A) 100-V Machine Model (A115-A) 1000-V Charged-Device Model (C101) All the evaluation(0)
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