SN74AVCBH324245

 ` Member of the Texas Instruments Widebus+™ Communications Family
` Ioff Supports Partial-Power-Down Mode ` DOC™ Circuitry Dynamically Changes Output Operation Impedance, Resulting in Noise Reduction ithout Speed Degradation ` Fully Configurable Dual-Rail Design Allows Each Port to Operate Over Full 1.4-V to 3.6-V
` Dynamic Drive Capability Is Equivalent to Power-Supply Range Standard Outputs With IOH and IOL of
` Bus Hold on Data Inputs Eliminates the Need
  ±24 mA at 3-V VCC for External Pullup/Pulldown Resistors
  ±15 mA at 2.3-V VCC
` Latch-Up Performance Exceeds 100 mA Per
  ±9 mA at 1.65-V VCC JESD 78, Class II
  ±6 mA at 1.4-V VCC ` ESD Protection Exceeds JESD 22
` Control Inputs VIH/VIL Levels Are Referenced
  2000-V Human-Body Model (A114-A) to VCCB Voltage
  200-V Machine Model (A115-A) ` If Either VCC Input Is at GND, Both Ports Are in
  1000-V Charged-Device Model (C101) the High-Impedance State

This SN74AVCBH324245 32-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 1.4 V to 3.6 V. The B port is designed to track V_CCB. V_CCB accepts any supply voltage from 1.4 V to 3.6 V. This allows for universal low-voltage bidirectional translation between any of the 1.5-V, 1.8-V, 2.5-V, and 3.3-V voltage nodes.

The SN74AVCBH324245 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 is used to disable the outputs, so the buses effectively are isolated.

The SN74AVCBH324245 is designed so that the control pins (1DIR, 2DIR, 1OE, and 2OE) are supplied by V_CCB.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level. Use of pullup or pulldown resistors with the bus-hold circuitry is not recommended. To ensure the high-impedance state of SN74AVCBH324245 during power up or power down,OE should be tied to V_CCB through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

This SN74AVCBH324245 device is fully specified 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. If either VCC input is at GND, both ports are in the high-impedance state.