TI SN74LVC8T245DBQR

The SN74LVC8T245 is an 8-bit non-inverting bus transceiver with configurable dual supply rails, supporting bidirectional voltage-level translation. The SN74LVC8T245 is optimized for operation with VCCA and VCCB set to a range of 1.65V to 5.5V. Port A is designed to track VCCA. VCCA accepts any supply voltage from 1.65V to 5.5V. Port B is designed to track VCCB. VCCB accepts any supply voltage from 1.65V to 5.5V. This enables universal low-voltage bidirectional translation between 1.8V, 2.5V, 3.3V, and 5.5V voltage nodes.

The SN74LVC8T245 is designed for asynchronous communication between two data buses. The logic levels on the direction control (DIR) input and output enable (OE) input activate the Port B outputs, the Port A outputs, or place both output ports in a high-impedance state. When the Port B outputs are activated, the device transmits data from the A bus to the B bus; when the Port A outputs are activated, the device transmits data from the B bus to the A bus. The input circuits on Port A and Port B are always active and must be driven to a logic high or low level to prevent excessive ICC and ICCZ.

This device fully conforms to the specifications 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 all outputs are in a high-impedance state whenever any VCC input is at GND. To ensure the high-impedance state during power-up or power-down, OE should be connected to VCC through a pull-up resistor; the minimum value of this resistor is determined by the current-sinking capability of the driver.

The SN74LVC8T245 device is designed so that the control pins (DIR and OE) are powered by VCCA.

• Control input VIH/VIL levels referenced to VcCA voltage
• Vcc isolation feature — if any Vcc input is tied to GND, all outputs enter high-impedance state
• Fully configurable dual-rail design supporting full supply voltage range of 1.65V to 5.5V on each port independently
• Latch-up performance exceeds 100mA, compliant with JESD78 Class II specification
• ESD protection performance exceeds JESD22 specification requirements
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  • 1000V Charged Device Model (C101)

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• Industrial Enterprise Telecom