SN74LVT245B - 3.3-V ABT Octal Bus Transceivers With 3-State Outputs

This octal bus transceiver is designed specifically for low-voltage (3.3-V) V_CC operation, but with the capability to provide a TTL interface to a 5-V system environment.

The SN74LVT245B 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.

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.

This device is fully specified for hot-insertion applications using I_off and power-up 3-state. The I_off circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.

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• Supports Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V V_CC)
• Supports Unregulated Battery Operation Down to 2.7 V
• Typical V_OLP (Output Ground Bounce)
     <0.8 V at V_CC = 3.3 V, T_A = 25°C
• I_off and Power-Up 3-State Support Hot Insertion
• Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
• ESD Protection Exceeds JESD 22
  • 2000-V Human-Body Model (A114-A)
  • 200-V Machine Model (A115-A)
  • 1000-V Charged-Device Model (C101)