IDT7281L datasheet(1/12 Pages) IDT

Part #	IDT7281L

Description	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

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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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

SEPTEMBER 2002

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

COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES

DSC-3208/5

FEATURES:

••••• The IDT7280 is equivalent to two IDT7200 256 x 9 FIFOs

••••• The IDT7281 is equivalent to two IDT7201 512 x 9 FIFOs

••••• The IDT7282 is equivalent to two IDT7202 1,024 x 9 FIFOs

••••• The IDT7283 is equivalent to two IDT7203 2,048 x 9 FIFOs

••••• The IDT7284 is equivalent to two IDT7204 4,096 x 9 FIFOs

••••• The IDT7285 is equivalent to two IDT7205 8,192 x 9 FIFOs

••••• Low power consumption

— Active: 685 mW (max.)

— Power-down: 83 mW (max.)

••••• Ultra high speed—12 ns access time

••••• Asynchronous and simultaneous read and write

••••• Offers optimal combination of data capacity, small foot print

and functional flexibility

••••• Ideal for bi-directional, width expansion, depth expansion,

bus-matching, and data sorting applications

••••• Status Flags: Empty, Half-Full, Full

••••• Auto-retransmit capability

••••• High-performance CMOS technology

••••• Space-saving TSSOP

••••• Industrial temperature range (–40

°°°°°C to +85°°°°°C) is available

DESCRIPTION:

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

load and empty data on a first-in/first-out basis. These devices are functional

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

package with all associated control, data, and flag lines assigned to separate

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

underflowandexpansionlogictoallowforunlimitedexpansioncapabilityinboth

word size and depth.

Thereadsandwritesareinternallysequentialthroughtheuseofringpointers,

with no address information required to load and unload data. Data is toggled

in and out of the devices through the use of the Write (

W) and Read (R) pins.

The devices utilize a 9-bit wide data array to allow for control and parity bits

at the user’s option. This feature is especially useful in data communications

applications where it is necessary to use a parity bit for transmission/reception

errorchecking.ItalsofeaturesaRetransmit(

RT)capabilitythatallowsforreset

of the read pointer to its initial position when

RT is pulsed LOW to allow for

retransmission from the beginning of data. A Half-Full Flag is available in the

single device mode and width expansion modes.

These FIFOs are fabricated using IDT’s high-speed CMOS technology.

They are designed for those applications requiring asynchronous and simul-

taneous read/writes in multiprocessing and rate buffer applications.

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

(DA0-DA8)

(DB0-DB8)

(QB0-QB8)

(QA0-QA8)

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

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