SN74LVT125DR

This bus buffer is designed specifically for low-voltage (3.3-V) VCC operation, but with the capability to provide a TTL interface to a 5-V system environment. The SN74LVT125 features independent line drivers with 3-state outputs. Each output is in the high-impedance state when the associated output-enable (OE(overline)) input is high. 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 Iₒff. The Iₒff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. To ensure the high-impedance state during power up or power down, OE(overline) should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

Key features

• Supports Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
• Supports Unregulated Battery Operation Down to 2.7 V
• Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3V, TA = 25℃
• Ioff Supports Partial-Power-Down Mode Operation
• Bus-Hold Data Inputs Eliminate the Need for External Pullup Resistors
• Latch-Up Performance Exceeds 500 mA Per JEDEC Standard JESD-17
• ESD Protection Exceeds JESD 22:
• 2000-V Human-Body Model (A114-A)
• 200-V Machine Model (A115-A)