CMOS SyncBiFIFOTM
256 x 36 x 2, 512 x 36 x 2,
1,024 x 36 x 2
IDT723622
IDT723632
IDT723642
• Available in 132-pin Plastic Quad Flatpack (PQFP) or space-
saving 120-pin Thin Quad Flatpack (TQFP)
• Low-power 0.8-Micron Advanced CMOS technology
• Industrial temperature range (–40°C to +85°C) is available
• Greenpartsavailable,seeorderinginformation
FEATURES:
• Memory storage capacity:
IDT723622
IDT723632
IDT723642
–
–
–
256 x 36 x 2
512 x 36 x 2
1,024 x 36 x 2
• 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 opposite
directions
DESCRIPTION:
TheIDT723622/723632/723642areamonolithic,high-speed,low-power,
CMOSBidirectionalSyncFIFO(clocked)memorywhichsupports clockfre-
quencies up to 83MHz and have read access times as fast as 8ns. Two
independent256/512/1,024x36dual-portSRAMFIFOsonboardeachchip
buffer data in opposite directions. Communication between each port may
bypasstheFIFOsviatwo36-bitmailboxregisters.Eachmailboxregisterhas
a flag to signal when new mail has been stored.
• 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 83MHz
• Fast access times of 8ns
These devices are a synchronous (clocked) FIFO, meaning each port
employsasynchronousinterface.Alldatatransfersthroughaportaregated
totheLOW-to-HIGHtransitionofaportclockbyenablesignals.Theclocksfor
FUNCTIONAL BLOCK DIAGRAM
MBF1
Mail 1
Register
CLKA
CSA
W/RA
ENA
MBA
Port-A
Control
Logic
RAM
ARRAY
256 x 36
512 x 36
1,024 x 36
36
FIFO1,
Mail1
Reset
Logic
RST1
Write
Pointer
Read
Pointer
36
Status Flag
Logic
ORB
AEB
IRA
AFA
FIFO 1
Programmable Flag
Offset Registers
FS
0
1
B0 - B35
FS
A
0
- A35
10
FIFO 2
ORA
AEA
Status Flag
Logic
IRB
AFB
36
Read
Pointer
Write
Pointer
36
FIFO2,
Mail2
Reset
Logic
RST2
RAM
ARRAY
256 x 36
512 x 36
CLKB
CSB
Port-B
Control
Logic
1,024 x 36
W/RB
ENB
MBB
Mail 2
Register
3022 drw 01
MBF2
IDTandtheIDTlogoareregisteredtrademarksofIntegratedDeviceTechnology,Inc. SyncBiFIFOisatrademarkofIntegratedDeviceTechnology,Inc.
FEBRUARY 2009
COMMERCIAL TEMPERATURE RANGE
1
©
2009 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DSC-3022/5