Integrated Device Technology, Inc.

COMMERCIAL TEMPERATURE RANGE

DECEMBER 1996

©1996 Integrated Device Technology, Inc.

DSC-3022/3

256 x 36 x 2, 512 x 36 x 2,

1024 x 36 x 2

FUNCTIONAL BLOCK DIAGRAM

IDT723622

IDT723632

IDT723642

FEATURES:

• Free-running CLKA and CLKB may be asynchronous or

coincident (simultaneous reading and writing of data on a

single clock edge is permitted)

• Two independent clocked FIFOs buffering data in oppo-

site directions

• Memory storage capacity:

IDT723622–256 x 36 x 2

IDT723632–512 x 36 x 2

IDT723642–1024 x 36 x 2

• Mailbox bypass register for each FIFO

• Programmable Almost-Full and Almost-Empty flags

• Microprocessor Interface Control Logic

• IRA, ORA,

AEA, and AFA flags synchronized by CLKA

• IRB, ORB,

AEB, and AFB flags synchronized by CLKB

• Supports clock frequencies up to 67MHz

Mail 1

Register

Programmable Flag

Offset Registers

256 x 36

512 x 36

1024 x 36

SRAM

Write

Pointer

Read

Pointer

Status Flag

Logic

256 x 36

512 x 36

1024 x 36

SRAM

Write

Pointer

Read

Pointer

Status Flag

Logic

CLKA

CSA

W/

RA

ENA

MBA

Port-A

Control

Logic

FIFO1,

Mail1

Reset

Logic

RST1

Mail 2

Register

MBF2

CLKB

CSB

W/RB

ENB

MBB

Port-B

Control

Logic

FIFO2,

Mail2

Reset

Logic

RST2

MBF1

FIFO 1

FIFO 2

9

ORB

AEB

36

36

IRB

AFB

IRA

AFA

ORA

AEA

3022 drw 01

36

36

• Fast access times of 11ns

• Available in 132-pin Plastic Quad Flatpack (PQF) or

space-saving 120-pin Thin Quad Flatpack (PF)

• Low-power 0.8-Micron Advanced CMOS technology

able, tested to military electrical specifications

DESCRIPTION:

The IDT723622/723632/723642 is a monolithic, high-speed,

low-power, CMOS Bidirectional SyncFIFO (clocked) memory

which supports clock frequencies up to 67MHz and have read

access times as fast as 11ns. Two independent 256/512/

1024x36 dual-port SRAM FIFOs on board each chip buffer

data in opposite directions. Each FIFO has flags to indicate

empty and full conditions and two programable flags (almost

SyncFIFO is a trademark and the IDT logo is a registered trademark of Integrated Device Technology, Inc.

5.22

For latest information contact IDT's web site at www.idt.com or fax-on-demand at 408-492-8391.