IDT72420_05 Datasheet, PDF (1/11 Pages) Integrated Device Technology – CMOS SyncFIFO

CMOS SyncFIFO™
64 x 8, 256 x 8,
512 x 8, 1,024 x 8,
2,048 x 8 and 4,096 x 8
IDT72420
IDT72200
IDT72210
IDT72220
IDT72230
IDT72240
FEATURES:
• 64 x 8-bit organization (IDT72420)
• 256 x 8-bit organization (IDT72200)
• 512 x 8-bit organization (IDT72210)
• 1,024 x 8-bit organization (IDT72220)
• 2,048 x 8-bit organization (IDT72230)
• 4,096 x 8-bit organization (IDT72240)
• 10 ns read/write cycle time (IDT72420/72200/72210/72220/72230/
72240)
• Read and Write Clocks can be asynchronous or coincidental
• Dual-Ported zero fall-through time architecture
• Empty and Full flags signal FIFO status
• Almost-Empty and Almost-Full flags set to Empty+7 and Full-7,
respectively
• Output enable puts output data bus in high-impedance state
• Produced with advanced submicron CMOS technology
• Available in 28-pin 300 mil plastic DIP
• For surface mount product please see the IDT72421/72201/72211/
72221/72231/72241 data sheet
• Industrial temperature range (–40°C to +85°C) is available
• Green parts available, see ordering information
DESCRIPTION:
The IDT72420/72200/72210/72220/72230/72240 SyncFIFO™ are very
high-speed, low-power First-In, First-Out (FIFO) memories with clocked
read and write controls. These devices have a 64, 256, 512, 1,024, 2,048,
and 4,096 x 8-bit memory array, respectively. These FIFOs are applicable
for a wide variety of data buffering needs, such as graphics, Local Area
Networks (LANs), and interprocessor communication.
These FIFOs have 8-bit input and output ports. The input port is
controlled by a free-running clock (WCLK), and a Write Enable pin (WEN).
Data is written into the Synchronous FIFO on every clock when WEN is
asserted. The output port is controlled by another clock pin (RCLK) and a
Read Enable pin (REN). The Read Clock can be tied to the Write Clock for
single clock operation or the two clocks can run asynchronous of one
another for dual clock operation. An Output Enable pin (OE) is provided on
the read port for three-state control of the output.
These Synchronous FIFOs have two endpoint flags, Empty (EF) and Full
(FF). Two partial flags, Almost-Empty (AE) and Almost-Full (AF), are
provided for improved system control. The partial (AE) flags are set to
Empty+7 and Full-7 for AE and AF respectively.
These FIFOs are fabricated using IDT’s high-speed submicron CMOS
technology.
FUNCTIONAL BLOCK DIAGRAM
WCLK
WEN
D0 - D7
WRITE CONTROL
LOGIC
WRITE POINTER
INPUT REGISTER
RAM ARRAY
64 x 8, 256 x 8,
512 x 8, 1,024 x 8,
2,048 x 8, 4,096 x 8
EF
FLAG
AE
LOGIC
AF
FF
READ POINTER
READ CONTROL
LOGIC
OUTPUT REGISTER
RESET LOGIC
RS
OE
Q0 - Q7
RCLK
REN
2680 drw01
IDT and the IDT logo are trademarks of Integrated Device Technology, Inc. The SyncFIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
1
©2006 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
FEBRUARY 2006
DSC-2680/4