SN74AVCH1T45 - Single-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs

The SN74AVCH1T45 is a single-bit noninverting bus transceiver that uses two separate configurable power-supply rails. The A port is designed to track V_CCA, which accepts any supply voltage from 1.2 V to 3.6 V. The B port is designed to track V_CCB, which also 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 SN74AVCH1T45 is designed for asynchronous communication between two data buses. The device transmits data from either the A bus to the B bus, or from the B bus to the A bus, depending upon the logic level at the direction-control (DIR) input.

The SN74AVCH1T45 is designed so that the DIR input is referenced to V_CCA.

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.

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.

The V_CC isolation feature ensures that if either V_CCA or V_CCB is at GND, then the outputs are in the high-impedance state. The bus-hold circuitry on the powered-up side always stays active.

NanoFree package technology is a major breakthrough in IC packaging concepts, using the die as the package.

• Available in the Texas Instruments NanoStar&trade
  and NanoFree™ Packages
• Control Inputs (DIR) V_IH and V_IL Levels Are
  Referenced to V_CCA Voltage
• Bus Hold on Data Inputs Eliminates the Need for
  External Pullup and Pulldown Resistors
• V_CC Isolation
• Fully Configurable Dual-Rail Design
• I/Os Are 4.6-V Tolerant
• I_off Supports Partial-Power-Down Mode Operation
• Typical Max Data Rates
  • 500 Mbps (1.8-V to 3.3-V Translation)
  • 320 Mbps (<1.8-V to 3.3-V Translation)
  • 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
  • Human-Body Model (A114-A): 2000 V
  • Machine Model (A115-A): 200 V
  • Charged-Device Model (C101): 1000 V