SN74AVCH2T45 - Dual-Bit Dual-Supply Bus Transceiver With Configurable Voltage Translation Aan 3-State Outputs

This 2-bit non-inverting bus transceiver uses two separate configurable power-supply rails. The A ports are designed to track V_CCA and accepts any supply voltage from 1.2 V to 3.6 V. The B ports are designed to track V_CCB and accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional translation and level-shifting between any of the 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V voltage nodes.

The SN74AVCH2T45 is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR pin) input activate either the B-port outputs or the A-port outputs. 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 SN74AVCH2T45 features active bus-hold circuitry, which holds unused or un-driven inputs at a valid logic state. TI does not recommend using pull-up or pull-down resistors with the bus-hold circuitry.

This device is fully specified for partial-power-down applications using I_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 either V_CC input is at GND, then both outputs are in the high-impedance state. The bus-hold circuitry on the powered-up side always stays active.

Active bus-hold circuitry holds unused or un-driven inputs at a valid logic state. NanoFree package technology is a major breakthrough in IC packaging concepts, using the die as the package.

• Available in the Texas Instruments NanoFree Package
• V_CC Isolation
• 2-Rail Design
• I/Os are 4.6 V Tolerant
• Partial Power-Down-Mode Operation
• Bus Hold on Data Inputs
• Maximum Data Rates
  • 500 Mbps (1.8 V to 3.3 V)
  • 320 Mbps (< 1.8 V to 3.3 V)
  • 320 Mbps (Level-Shifting to 2.5 V or 1.8 V)
  • 280 Mbps (Level-Shifting to 1.5 V)
  • 240 Mbps (Level-Shifting to 1.2 V)
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22