SN74ALVCH162260 12-BIT TO 24-BIT MULTIPLEXED D-TYPE LATCH WITH 3-STATE OUTPUTS

SCAS570D - MARCH 1996 - REVISED JANUARY 1998

features

• Member of the Texas Instruments Widebus^TM Family
• EPIC^TM (Enhanced-Performance Implanted CMOS) Submicron Process
• B-Port Outputs Have Equivalent 26- Series Resistors, So No External Resistors Are Required
• ESD Protection Exceeds 2000 V Per MIL-STD-883, Method 3015; Exceeds 200 V Using Machine Model (C = 200 pF, R = 0)
• Latch-Up Performance Exceeds 250 mA Per JESD 17
• Bus Hold on Data Inputs Eliminates the Need for External Pullup/Pulldown Resistors
• Package Options Include Thin-Shrink Small-Outline (DGG) and Plastic Shrink Small-Outline (DL) Packages

  EPIC and Widebus are trademarks of Texas Instruments Incorporated.

description

This 12-bit to 24-bit multiplexed D-type latch is designed for 2.3-V to 3.6-V_CC operation.

The SN74ALVCH162260 is used in applications in which two separate datapaths must be multiplexed onto, or demultiplexed from, a single datapath. Typical applications include multiplexing and/or demultiplexing address and data information in microprocessor or bus-interface applications. This device is also useful in memory-interleaving applications.

Three 12-bit I/O ports (A1-A12, 1B1-1B12, and 2B1-2B12) are available for address and/or data transfer. The output-enable (OE1B\, OE2B\, and OEA\) inputs control the bus transceiver functions. The OE1B\ and OE2B\ control signals also allow bank control in the A-to-B direction.

Address and/or data information can be stored using the internal storage latches. The latch-enable (LE1B, LE2B, LEA1B, and LEA2B) inputs are used to control data storage. When the latch-enable input is high, the latch is transparent. When the latch-enable input goes low, the data present at the inputs is latched and remains latched until the latch-enable input is returned high.

The B outputs, which are designed to sink up to 12 mA, include equivalent 26- resistors to reduce overshoot and undershoot.

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.

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

The SN74ALVCH162260 is characterized for operation from -40°C to 85°C.

View more information about generic part numbers:SN74ALVCH162260

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