SN74ALVCH162721 3.3-V 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS

SCES055C - DECEMBER 1995 - REVISED AUGUST 1997

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features

Member of the Texas Instruments Widebus^TM Family
EPIC^TM (Enhanced-Performance Implanted CMOS) Submicron Process
Output Ports 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 Plastic 300-mil Shrink Small-Outline (DL) and Thin Shrink Small-Outline (DGG) Packages

EPIC and Widebus are trademarks of Texas Instruments Incorporated.

description

This 20-bit flip-flop is designed for low-voltage 2.3-V to 3.6-V V_CC operation.

The 20 flip-flops of the SN74ALVCH162721 are edge-triggered D-type flip-flops with qualified clock storage. On the positive transition of the clock (CLK) input, the device provides true data at the Q outputs if the clock-enable (CLKEN\) input is low. If CLKEN\ is high, no data is stored.

A buffered output-enable (OE\) input places the 20 outputs in either a normal logic state (high or low level) or the high-impedance state. In the high-impedance state, the outputs neither load

nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components. OE\ does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

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

The SN74ALVCH162721 is characterized for operation from -40°C to 85°C.

Title: 3.3-V 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS
Product Family: D-TYPE (3-STATE) FLIP-FLOPS
Device Functionality: 20-BIT D-TYPE FLIP-FLOP
Orderable Devices: SN74ALVCH162721DGGR, SN74ALVCH162721DL, SN74ALVCH162721DLR

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View more information about generic part numbers:SN74ALVCH162721

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