SN74AVCH16T245 - 16-Bit Dual Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs

This 16-bit noninverting bus transceiver uses two separate configurable power-supply rails. The SN74AVCH16T245 device is optimized to operate with V_CCA/V_CCB set at 1.4 V to 3.6 V. The device is operational with V_CCA/V_CCB as low as 1.2 V. The A port is designed to track V_CCA. V_CCA accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track V_CCB. V_CCB accepts any supply voltage from 1.2 V to 3.6 V. This allows for universal low-voltage bidirectional translation between any of the 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.

The SN74AVCH16T245 control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by V_CCA.

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

The V_CC isolation feature ensures that if either V_CC input is at GND, then both ports are in the high-impedance state.

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended.

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 the driver.

The SN74AVCH16T245 is designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the outputs so the buses are effectively isolated.

• V_CC Isolation Feature – If Either V_CC Input is at GND, Both Ports are in the High-Impedance State
• Control Inputs V_IH/V_IL Levels Are Referenced to V_CCA Voltage
• Overvoltage-Tolerant Inputs and Outputs Allow Mixed Voltage-Mode Data Communications
• Fully Configurable Dual-Rail Design Allows Each Port to Operate Over the Full 1.2 V to 3.6 V Power-Supply Range
• I_off Supports Partial-Power-Down Mode Operation
• I/Os are 4.6 V Tolerant
• Bus Hold on Data Inputs Eliminates the Need for External Pullup and Pulldown Resistors
• Maximum Data Rates
  • 380 Mbps (1.8 V to 3.3 V Level-Shifting)
  • 200 Mbps (<1.8 V to 3.3 V Level-Shifting)
  • 200 Mbps (Level-Shifting to 2.5 V or 1.8 V)
  • 150 Mbps (Level-Shifting to 1.5 V)
  • 100 Mbps (Level-Shifting to 1.2 V)
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22
  • 8000-V Human-Body Model (A114-A)
  • 200-V Machine Model (A115-A)
  • 1000-V Charged-Device Model (C101)