SN74LVC4245A - Octal Bus Transceiver And 3.3-V To 5-V Shifter With 3-State Outputs

This 8-bit (octal) noninverting bus transceiver contains two separate supply rails; B port has V_CCB, which is set at 3.3 V, and A port has V_CCA, which is set at 5 V. This allows for translation from a 3.3-V to a 5-V environment, and vice versa.

The SN74LVC4245A device 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 device so the buses are effectively isolated. The control circuitry (DIR, OE) is powered by V_CCA.

The SN74LVC4245A device terminal out allows the designer to switch to a normal all-3.3-V or all-5-V 20-terminal SN74LVC4245 device without board re-layout. The designer uses the data paths for pins 2–11 and 14–23 of the SN74LVC4245A device to align with the conventional ’245 terminal out.

• Bidirectional Voltage Translator
• 5.5 V on A Port and 2.7 V to 3.6 V on B Port
• Control Inputs V_IH/V_IL Levels Are
  Referenced to V_CCA Voltage
• Latch-Up Performance Exceeds 250 mA
  Per JESD 17
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model
  • 200-V Machine Model
  • 1000-V Charged-Device Model