IDT72401
IDT72402
IDT72403
IDT72404
CMOS PARALLEL FIFO
64 x 4 and 64 x 5
Integrated Device Technology, Inc.
64 words by 5 bits. The IDT72403 and IDT72404 also have an
Output Enable (OE) pin. The FlFOs accept 4-bit or 5-bit data
at the data input (D0-D3, 4). The stored data stack up on a first-
in/first-out basis.
FEATURES:
• First-ln/First-Out Dual-Port memory
• 64 x 4 organization (IDT72401/72403)
• 64 x 5 organization (IDT72402/72404)
• RAM-based FIFO with low falI-through time
• Low-power consumption
— Active: 175mW (typ.)
• Maximum shift rate — 45MHz
• High data output drive capability
• Asynchronous and simultaneous read and write
• Fully expandable by bit width
A Shift Out (SO) signal causes the data at the next to last
word to be shifted to the output while all other data shifts down
one location in the stack. The Input Ready (IR) signal acts like
a flag to indicate when the input is ready for new data
(IR = HIGH) or to signal when the FIFO is full (IR = LOW). The
IR signal can also be used to cascade multiple devices
together. The Output Ready (OR) signal is a flag to indicate
that the output remains valid data (OR = HIGH) or to indicate
that the FIFO is empty (OR = LOW). The OR can also be used
to cascade multiple devices together.
• Fully expandable by word depth
• IDT72403/72404 have Output Enable pin to enable
output data
Width expansion is accomplished by logically ANDing the
IR and OR signals to form composite signals.
• High-speed data communications applications
• High-performance CMOS technology
• Available in CERDIP, plastic DIP and SOIC
• Military product compliant to MlL-STD-883, Class B
• Standard Military Drawing #5962-86846 and
5962-89523 is listed on this function.
• Industrial temperature range (–40°C to +85°C) is avail-
able (plastic packages only)
Depth expansion is accomplished by tying the data inputs
of one device to the data outputs of the previous device. The
IR pin of the receiving device is connected to the SO pin of the
sending device and the OR pin of the sending device is
connected to the Shift In (SI) pin of the receiving device.
Reading and writing operations are completely asynchro-
nous allowing the FIFO to be used as a buffer between two
digital machines of widely varying operating frequencies. The
45MHz speed makes these FlFOs ideal for high-speed com-
munication and controller applications.
DESCRIPTION:
The IDT72401 and IDT72403 are asynchronous high-
performance First-ln/First-Out memories organized 64 words
by 4 bits. The IDT72402 and IDT72404 are asynchronous
high-performance First-ln/First-Out memories organized as
Military grade product is manufactured in compliance with
the latest revision of MIL-STD-883, Class B.
FUNCTIONAL BLOCK DIAGRAM
OUTPUT
ENABLE
INPUT
CONTROL
LOGIC
OE (IDT72403 and
IDT72404)
SI
IR
WRITE POINTER
WRITE MULTIPLEXER
D0-3
D4
(IDT72402
and IDT72404)
Q0-3
MEMORY
ARRAY
DATAIN
DATAOUT
Q
4
(IDT72402 and
IDT72404)
READ MULTIPLEXER
READ POINTER
MASTER
RESET
SO
OR
MR
OUTPUT
CONTROL
LOGIC
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The IDT logo is a registered trademark of Integrated Device Technology, Inc.
FAST is a trademark of National Semiconductor, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
MAY 1998
©1998 Integrated Device Technology, Inc.
For latest information contact IDT's web site at www.idt.com or fax-on-demand at 408-492-8391.
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