CMOS SyncBiFIFOTM
2,048 x 36 x 2
4,096 x 36 x 2
IDT723652
IDT723662
IDT723672
8,192 x 36 x 2
• Select IDT Standard timing (using EFA, EFB, FFA and FFB flags
functions) or First Word Fall Through timing (using ORA, ORB, IRA
and IRB flag functions)
• Available in 132-pin Plastic Quad Flatpack (PQFP) or space-saving
120-pin Thin Quad Flatpack (TQFP)
• Pincompatibletothelowerdensityparts,IDT723622/723632/723642
• Industrial temperature range (–40°C to +85°C) is available
FEATURES
• Memory storage capacity:
IDT723652
IDT723662
IDT723672
–
–
–
2,048 x 36 x 2
4,096 x 36 x 2
8,192 x 36 x 2
• Supports clock frequencies up to 83MHz
• Fast access times of 8ns
• Free-running CLKA and CLKB may be asynchronous or coincident
(simultaneous reading and writing of data on a single clock edge
is permitted)
DESCRIPTION
TheIDT723652/723662/723672isamonolithic,high-speed,low-power,
• Two independent clocked FIFOs buffering data in opposite direc- CMOS Bidirectional SyncFIFO (clocked) memories which support clock
tions
frequencies up to 83MHz and have read access times as fast as 8ns. Two
independent2,048/4,096/8,192x36dual-portSRAMFIFOs onboardeach
chipbufferdatainoppositedirections. Communicationbetweeneachportmay
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
• FFA/IRA, EFA/ORA, AEA, and AFA flags synchronized by CLKA
• FFB/IRB, EFB/ORB, AEB, and AFB flags synchronized by CLKB
FUNCTIONAL BLOCK DIAGRAM
MBF1
Mail 1
Register
CLKA
CSA
W/RA
ENA
MBA
Port-A
Control
Logic
RAM
ARRAY
2,048 x 36
4,096 x 36
8,192 x 36
36
FIFO1,
Mail1
Reset
Logic
RST1
Write
Pointer
Read
Pointer
36
Status Flag
Logic
EFB/ORB
AEB
FFA/IRA
AFA
FIFO 1
FS
0
1
Programmable Flag
Offset Registers
Timing
Mode
FWFT
FS
A
0
- A35
13
B0 - B35
FIFO 2
Status Flag
EFA/ORA
FFB/IRB
AFB
Logic
AEA
36
Read
Pointer
Write
Pointer
36
FIFO2,
Mail2
Reset
Logic
RST2
RAM
ARRAY
2,048 x 36
4,096 x 36
8,192 x 36
CLKB
CSB
W/RB
ENB
MBB
Port-B
Control
Logic
Mail 2
Register
5609 drw 01
MBF2
IDTandtheIDTlogoareregisteredtrademarksofIntegratedDeviceTechnology,Inc.SyncBiFIFOisatrademarkofIntegratedDeviceTechnology,Inc.
COMMERCIAL TEMPERATURE RANGE
NOVEMBER 2003
1
2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DSC-5609/4