SN74AVCH20T245 - 20-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs

This 20-bit noninverting bus transceiver uses two separate configurable power-supply rails. The SN74AVCH20T245 is optimized to operate with V_CCA/V_CCB set at 1.4 V to 3.6 V. It 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 SN74AVCH20T245 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 that the buses are effectively isolated.

The SN74AVCH20T245 is designed so that the control (1DIR, 2DIR, 1OE\, and 2OE\) inputs are supplied by V_CCA.

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, 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 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.

Products containing the "SN74AVCH20T245" keyword are: SN74AVCH20T245GR , SN74AVCH20T245GR , SN74AVCH20T245GRE4 , SN74AVCH20T245GRG4 , SN74AVCH20T245KR , SN74AVCH20T245KR , SN74AVCH20T245VR , SN74AVCH20T245VR

• 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, Both Ports Are in the High-Impedance State
• Overvoltage-Tolerant Inputs/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/Pulldown Resistors
• Max Data Rates
  • 380 Mbps (1.8-V to 3.3-V Translation)
  • 260 Mbps (1.8-V to 3.3-V Translation)
  • 260 Mbps (Translate to 2.5 V)
  • 210 Mbps (Translate to 1.8 V)
  • 120 Mbps (Translate to 1.5 V)
  • 100 Mbps (Translate 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)