3.3 VOLT CMOS SyncFIFO
TM
256 x 18, 512 x 18, 1,024 x 18,
2,048 x 18, and 4,096 x 18
IDT72V205, IDT72V215,
IDT72V225, IDT72V235,
IDT72V245
FEATURES:
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DESCRIPTION:
The IDT72V205/72V215/72V225/72V235/72V245 are functionally com-
patible versions of the IDT72205LB/72215LB/72225LB/72235LB/72245LB,
designed to run off a 3.3V supply for exceptionally low power consumption.
These devices are very high-speed, low-power First-In, First-Out (FIFO)
memories with clocked read and write controls. These FIFOs are applicable
for a wide variety of data buffering needs, such as optical disk controllers, Local
Area Networks (LANs), and interprocessor communication.
These FIFOs have 18-bit input and output ports. The input port is controlled
by a free-running clock (WCLK), and an input enable pin (WEN). Data is read
into the synchronous FIFO on every clock when
WEN
is asserted. The output
port is controlled by another clock pin (RCLK) and another enable pin (REN).
The Read Clock(RCLK) 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.
The synchronous FIFOs have two fixed flags, Empty Flag/Output Ready
(EF/OR) and Full Flag/Input Ready (FF/IR), and two programmable flags,
Almost-Empty (PAE) and Almost-Full (PAF). The offset loading of the program-
256 x 18-bit organization array (IDT72V205)
512 x 18-bit organization array (IDT72V215)
1,024 x 18-bit organization array (IDT72V225)
2,048 x 18-bit organization array (IDT72V235)
4,096 x 18-bit organization array (IDT72V245)
10 ns read/write cycle time
5V input tolerant
IDT Standard or First Word Fall Through timing
Single or double register-buffered Empty and Full flags
Easily expandable in depth and width
Asynchronous or coincident Read and Write Clocks
Asynchronous or synchronous programmable Almost-Empty
and Almost-Full flags with default settings
Half-Full flag capability
Output enable puts output data bus in high-impedanc state
High-performance submicron CMOS technology
Available in a 64-lead thin quad flatpack (TQFP/STQFP)
Industrial temperature range (–40°C to +85°C) is available
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°
FUNCTIONAL BLOCK DIAGRAM
WEN
WCLK
D0-D17
LD
INPUT REGISTER
OFFSET REGISTER
FF/IR
PAF
EF/OR
PAE
HF/(WXO)
WRITE CONTROL
LOGIC
FLAG
LOGIC
RAM ARRAY
256 x 18, 512 x 18
1,024 x 18, 2,048 x 18
4,096 x 18
WRITE POINTER
FL
WXI
(HF)/WXO
RXI
RXO
RS
READ POINTER
READ CONTROL
LOGIC
EXPANSION LOGIC
OUTPUT REGISTER
RESET LOGIC
OE
Q0-Q17
RCLK
REN
4294 drw 01
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc. SyncFIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
©2002
Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
FEBRUARY 2002
DSC-4294/3
IDT [ INTEGRATED DEVICE TECHNOLOGY ]
