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CMOS DUAL ASYNCHRONOUS FIFO

DUAL 256 x 9, DUAL 512 x 9,

DUAL 1,024 x 9, DUAL 2,048 x 9,

DUAL 4,096 x 9, DUAL 8,192 x 9

IDT7280

IDT7281

IDT7282

IDT7283

IDT7284

IDT7285

JUNE 2012

IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc

COMMERCIALANDINDUSTRIALTEMPERATURERANGES

©2012 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.

DSC-3208/9

FEATURES:

— Active: 685 mW (max.)

— Power-down: 83 mW (max.)

and functional flexibility

bus-matching, and data sorting applications

°°°°°C to +85°°°°°C) is available

DESCRIPTION:

The IDT7280/7281/7282/7283/7284/7285 are dual-FIFO memories that

loadandemptydataonafirst-in/first-outbasis.Thesedevicesarefunctional

andcompatibletotwoIDT7200/7201/7202/7203/7204/7205FIFOsinasingle

packagewithallassociatedcontrol,data,andflaglinesassignedtoseparate

pins. The devices use Full and Empty flags to prevent data overflow and

underflowandexpansionlogictoallowforunlimitedexpansioncapabilityinboth

word size and depth.

Thereadsandwritesareinternallysequentialthroughtheuseofringpointers,

withnoaddressinformationrequiredtoloadandunloaddata.Dataistoggled

in and out of the devices through the use of the Write (W) and Read (R) pins.

Thedevicesutilizea9-bitwidedataarraytoallowforcontrolandparitybits

attheuser’soption.Thisfeatureis especiallyusefulindatacommunications

applicationswhereitisnecessarytouseaparitybitfortransmission/reception

errorchecking.ItalsofeaturesaRetransmit(RT)capabilitythatallowsforreset

of the read pointer to its initial position when RT is pulsed LOW to allow for

retransmissionfromthebeginningofdata.AHalf-FullFlagisavailableinthe

single device mode and width expansion modes.

TheseFIFOsarefabricatedusinghigh-speedCMOStechnology.Theyare

designed for those applications requiring asynchronous and simultaneous

read/writesinmultiprocessingandratebufferapplications.

FUNCTIONAL BLOCK DIAGRAM

WA

WRITE

CONTROL

READ

CONTROL

RA

FLAG

LOGIC

EXPANSION

LOGIC

XIA

WRITE

POINTER

READ

POINTER

DATA INPUTS

RESET

LOGIC

THREE-

STATE

BUFFERS

DATA

OUTPUTS

RSA

FLA/RTA

XOA/HFA

FFA

EFA

WB

WRITE

CONTROL

READ

CONTROL

RB

FLAG

LOGIC

EXPANSION

LOGIC

XIB

WRITE

POINTER

RAM

ARRAY B

256 x 9

512 x 9

1,024 x 9

2,048 x 9

4,096 x 9

8,192 x 9

READ

POINTER

DATA INPUTS

RESET

LOGIC

THREE-

STATE

BUFFERS

DATA

OUTPUTS

RSB

FLB/RTB

3208 drw 01

XOB/HFB

FFB

EFB

RAM

ARRAY A

256 x 9

512 x 9

1,024 x 9

2,048 x 9

4,096 x 9

8,192 x 9