SN74AVC2T245 - Dual-Bit, 2-DIR pin Dual-Supply Bus Transceiver w/ Configurable Voltage Translation, 3-State Output

This dual-bit noninverting bus transceiver uses two separate configurable power-supply rails. 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 SN74AVC2T245 is designed for asynchronous communication between two data buses. The logic levels of the direction-control (DIR) input and the output-enable (OE) 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 always is active and must have a logic HIGH or LOW level applied to prevent excess I_CC and I_CCZ.

The SN74AVC2T245 control pins (DIR1, DIR2, and OE) 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 ports are in the high-impedance state.

To ensure the high-impedance state during power up or power down, OE must be connected to V_CC through a pull-up resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

• Each Channel Has Independent Direction Control
• Control Inputs V_IH/V_IL Levels Are Referenced to
  V_CCA Voltage
• Fully Configurable Dual-Rail Design Allows Each
  Port to Operate Over the Full 1.2 V to
  3.6 V Power-Supply Range
• I/Os Are 4.6 V Tolerant
• I_off Supports Partial-Power-Down Mode Operation
• V_CC Isolation Feature - If Either V_CC Input is at
  GND, Both Ports are in High-Impedance State
• Typical Data Rates
  • 500 Mbps (1.8 V to 3.3 V Level-Shifting)
  • 320 Mbps (<1.8 V to 3.3 V Level-Shifting)
  • 320 Mbps (Translate to 2.5 V or 1.8 V)
  • 280 Mbps (Translate to 1.5 V)
  • 240 Mbps (Translate to 1.2 V)
• Latch-Up Performance Exceeds 100 mA Per
  JESD 78, Class II
• ESD Protection Exceeds JESD 22
  • 5000 V Human-Body Model (A114-A)
  • 200 V Machine Model (A115-A)
  • 1500 V Charged-Device Model (C101)