SN74ALVC16821 3.3-V 20-BIT BUS-INTERFACE FLIP-FLOP WITH 3-STATE OUTPUTS

SCAS269 - MARCH 1993 - REVISED MARCH 1994

features

Member of the Texas Instruments Widebus^TM Family
EPIC^TM (Enhanced-Performance Implanted CMOS) Submicron Process
Supports Unregulated Battery Operation Down to 2.7 V
Typical V_OLP (Output Ground Bounce) 0.8 V at V_CC = 3.3 V, T_A = 25°C
Typical V_OHV (Output V_OH Undershoot) > 2 V at V_CC = 3.3 V, T_A = 25°C
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

description

This 20-bit bus-interface flip-flop is designed specifically forlow-voltage (3.3 V) V_CC operation.

The SN74ALVC16821 can be used as two 10-bit flip-flops or one20-bit flip-flop. The twenty flip-flops are edge-triggered D-typeflip-flops. On the positive transition of the clock (CLK) input, thedevice provides true data at the Q outputs.

A buffered output-enable () input can be used to place the ten outputs in either anormal logic state (high or low level) or a high-impedance state. Inthe high-impedance state, the outputs neither load nor drive the buslines significantly. The high-impedance state and increased driveprovide the capability to drive bus lines without need for interfaceor pullup components.

The output-enable ()input does not affect the internal operation of the flip-flops. Olddata can be retained or new data can be entered while the outputs arein the high-impedance state.

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

The SN74ALVC16821 is available in TI's shrink small-outline (DL)and thin shrink small-outline (DGG) packages, which provide twice theI/O pin count and functionality of standard small-outline packages inthe same printed-circuit-board area.

The SN74ALVC16821 is characterized for operation from -40°Cto 85°C.

Title: 3.3-V 20-BIT BUS-INTERFACE FLIP-FLOP WITH 3-STATE OUTPUTS
Product Family: D-TYPE (3-STATE) FLIP-FLOPS
Device Functionality: BUS INTERFACE
Orderable Devices: SN74ALVC16821DL, SN74ALVC16821DLR

View the complete PDF datasheet: scas269.pdf (91 K Bytes) (Requires Acrobat Reader 3.x)

View more information about generic part numbers:SN74ALVC16821

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