IDT723631_14 Datasheet, PDF (1/20 Pages) Integrated Device Technology – CMOS SyncFIFO

CMOS SyncFIFO™
512 x 36
1,024 x 36
2,048 x 36
IDT723631
IDT723641
IDT723651
FEATURES:
• Storage capacity:
IDT723631 - 512 x 36
IDT723641 - 1,024 x 36
IDT723651 - 2,048 x 36
• Supports clock frequencies up to 67 MHz
• Fast access times of 11ns
• Free-running CLKA and CLKB can be asynchronous or coinci-
dent (permits simultaneous reading and writing of data on a
single clock edge)
• Clocked FIFO buffering data from Port A to Port B
• Synchronous read retransmit capability
• Mailbox register in each direction
• Programmable Almost-Full and Almost-Empty flags
• Microprocessor interface control logic
• Input Ready (IR) and Almost-Full (AF) flags synchronized by
CLKA
• Output Ready (OR) and Almost-Empty (AE) flags synchronized
by CLKB
• Available in space-saving 120-pin thin quad flat package (TQFP)
• Green parts available, see ordering information
DESCRIPTION:
The IDT723631/723641/723651 is a monolithic high-speed, low-power,
CMOS clocked FIFO memory. It supports clock frequencies up to 67 MHz
and has read access times as fast as 11ns. The 512/1,024/2,048 x 36
dual-port SRAM FIFO buffers data from port A to Port B. The FIFO memory
has retransmit capability, which allows previously read data to be ac-
cessed again. The FIFO has flags to indicate empty and full conditions and
two programmable flags (Almost-Full and Almost-Empty) to indicate when a
selected number of words is stored in memory. Communication between
each port may take place with two 36-bit mailbox registers. Each mailbox
register has a flag to signal when new mail has been stored. Two or more
FUNCTIONAL BLOCK DIAGRAM
MBF1
CLKA
CSA
W/RA
ENA
MBA
Port-A
Control
Logic
RST
Reset
Logic
36
A0 - A35
IR
AF
Mail 1
Register
RAM ARRAY
512 x 36
1,024 x 36
2,048 x 36
Write Read
Pointer Pointer
Status Flag
Logic
RTM
RFM
B0 - B35
OR
AE
FS0/SD
FS1/SEN
Flag Offset
10
Registers
Mail 2
Register
MBF2
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. The SyncFIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
©2014 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
Port-B
Control
Logic
CLKB
CSB
W/RB
ENB
MBB
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MARCH 2014
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