SN54ALVTH162827, SN74ALVTH162827
2.5-V/3.3-V 20-BIT BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SCES079A - JULY 1996 - REVISED JULY 1996

features

• Members of the Texas Instruments Widebus^TM Family
• Output Ports Have Equivalent 30- Series Resistors, So No External Resistors Are Required
• High-Impedance State During Power Up and Power Down
• 5-V I/O Compatible
• High-Drive Capability (-12 mA/12 mA)
• Typical V_OLP (Output Ground Bounce) < 0.8 V at V_CC = 3.3 V, T_A = 25°C
• Auto 3-State Eliminates Bus Current Loading When Voltage at the Output Exceeds V_CC
• Bus-Hold Data Inputs Eliminate the Need for External Pullup/Pulldown Resistors
• Power Off Disables Inputs/Outputs, Permitting Live Insertion
• Package Options Include Plastic 300-mil Shrink Small-Outline (DL), Thin Shrink Small-Outline (DGG), Thin Very Small-Outline (DGV) Packages, and 380-mil Fine-Pitch Ceramic Flat (WD) Package

  Widebus is a trademark of Texas Instruments Incorporated.

description

The 'ALVTH162827 are 20-bit buffers/line drivers designed for low-voltage 2.5-V or 3.3-V V_CC operation, but with the capability to provide a TTL interface to a 5-V system environment.

The 'ALVTH162827 are composed of two 10-bit

sections with separate output-enable signals. For either 10-bit buffer section, the two output-enable (1 and 1 or 2 and 2) inputs must both be low for the corresponding Y outputs to be active. If either output-enable input is high, the outputs of that 10-bit buffer section are in the high-impedance state.

When V_CC is between 0 and 1.2 V, the device is in the high-impedance state during power up or power down. However, to ensure the high-impedance state above 1.2 V, 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.

All outputs are designed to sink up to 12 mA and include 30- resistors to reduce overshoot and undershoot.

Active bus-hold circuitry is provided to hold unused or floating data inputs at a valid logic level.

The SN74ALVTH162827 is available in TI's thin very small-outline package (DGV), which provides the same I/O pin count and functionality of standard Widebus packages in less than half the printed circuit board area.

The SN54ALVTH162827 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALVTH162827 is characterized for operation from -40°C to 85°C.