INDUSTRIALTEMPERATURERANGE

IDT74ALVCH16721

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

1

JANUARY 2004

INDUSTRIAL TEMPERATURE RANGE

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

© 2004 Integrated Device Technology, Inc.

DSC-4747/2

FEATURES:

• 0.5 MICRON CMOS Technology

• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using

machine model (C = 200pF, R = 0)

• CMOS power levels (0.4

µµµµµ W typ. static)

• Rail-to-Rail output swing for increased noise margin

• Available in SSOP and TSSOP packages

FUNCTIONAL BLOCK DIAGRAM

APPLICATIONS:

• 3.3V high speed systems

• 3.3V and lower voltage computing systems

DRIVE FEATURES:

• High Output Drivers: ±24mA

• Low switching noise

IDT74ALVCH16721

3.3V CMOS 20-BIT

FLIP-FLOP WITH 3-STATE

OUTPUTS AND BUS-HOLD

DESCRIPTION:

This20-bitflip-flopisbuiltusingadvanceddualmetalCMOStechnology.The

20 flip-flops of the ALVCH16721 are edge-triggered D-type flip-flops with

qualifiedclockstorage.Onthepositivetransitionoftheclock(CLK)input,the

deviceprovidestruedataattheQoutputsiftheclock-enable(CLKEN)input

is low. If CLKEN is high, no data is stored.

Abufferedoutput-enable(OE)inputplacesthe20outputsineitheranormal

logicstate(highorlow)orahigh-impedancestate.Inthehigh-impedancestate,

the outputs neither load nor drive the bus lines significantly. The high-

impedancestateandincreaseddriveprovidethecapabilitytodrivebuslines

withoutneedforinterfaceorpullupcomponents.OEdoesnotaffecttheinternal

operationoftheflip-flops.Olddatacanberetainedornewdatacanbeentered

whiletheoutputsareinthehigh-impedancestate.

The ALVCH16721 has been designed with a ±24mA output driver. This

driveriscapableofdrivingamoderatetoheavyloadwhilemaintainingspeed

performance.

The ALVCH16721 has “bus-hold” which retains the inputs’ last state

whenevertheinputgoestoahighimpedance. Thispreventsfloatinginputs

andeliminatestheneedforpull-up/downresistor.

CLK

OE

CLKE N

1

56

29

55

CE

C1

1D

2

TO 19 OTHER CHAN NELS