SN74AVC32T245

• Member of the Texas Instruments Widebus+™ Family
• Control Inputs V_IH/V_IL Levels 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 Full 1.2 V to 3.6 V Power-Supply Range
• I_off Supports Partial-Power-Down Mode Operation
• 4.6 V Tolerant I/Os
• Max 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 (Translate to 2.5 V or 1.8 V)
  • 150 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
  • 4000 V Human-Body Model (A114-A)
  • 1000 V Charged-Device Model (C101)

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This 32-bit noninverting bus transceiver uses two separate, configurable power-supply rails. The SN74AVC32T245 device is optimized to operate with V_CCA/V_CCB set from 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 and accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track V_CCB. V_CCB and 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, 1.5V, 1.8 V, 2.5 V, and 3.3 V voltage nodes.

The SN74AVC32T245 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 disable the outputs so the buses are effectively isolated.

The SN74AVC32T245 is designed so that the control pins (1DIR, 2DIR, 3DIR, 4DIR, 1 OE, 2 OE, 3 OE, and 4 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, then both ports are in the high-impedance state.

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.