SN74LVTH540DWR

These octal buffers/drivers are 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 'LVTH540 devices are ideal for driving bus lines or buffer-memory address registers. These devices feature inputs and outputs on opposite sides of the package that facilitate printed circuit board layout. The 3-state control gate is a 2-input AND gate with active-low inputs so that, if either output-enable (OE1 or OE2) input is high, all outputs are in the high-impedance state. Active bus-hold circuitry holds unused or undriven inputs at a valid logic state. Use of pullup or puldown resistors with the bus-hold circuitry is not recommended. When VCC is between 0 and 1.5 V, the devices are in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.5 V, 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. These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are 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.

Applications

• Drive bus lines
• Buffer memory address registers

Key features

• Support Mixed-Mode Signal Operation (5-V Input and Output Voltages With 3.3-V VCC)
• Typical VOLP (Output Ground Bounce) < 0.8 V at VCC = 3.3V TA = 25℃
• Support Unregulated Battery Operation Down to 2.7V
• Ioff and Power-Up 3-State Support Hot Insertion
• Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
• Latch-Up Performance Exceeds 500mA Per JESD 17
• ESD Protection Exceeds JESD22 - 2000-V Human-Body Model (A114-A); 200-V Machine Model (A115-A)