IDT72401
IDT72403
CMOSPARALLELFIFO
64 x 4 and 64 x 5
hasanOutputEnable(OE)pin.TheFlFOsaccept4-bit dataatthedatainput
(D0-D3). The storeddata stackupona first-in/first-outbasis.
AShiftOut(SO)signalcausesthedataatthenexttolastwordtobeshifted
totheoutputwhileallotherdatashiftsdownonelocationinthestack.TheInput
Ready(IR)signalacts like a flagtoindicate whenthe inputis readyfornew
data(IR=HIGH)or tosignalwhentheFIFOisfull(IR=LOW). TheIRsignal
canalsobeusedtocascademultipledevicestogether.TheOutputReady(OR)
signalis a flagtoindicate thatthe outputremains validdata (OR=HIGH)or
toindicate thatthe FIFOis empty(OR=LOW).The ORcanalsobe usedto
cascademultipledevicestogether.
FEATURES:
• First-ln/First-Out Dual-Port memory
• 64 x 4 organization (IDT72401/72403)
• 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
WidthexpansionisaccomplishedbylogicallyANDingtheIRandORsignals
toformcompositesignals.
• Fully expandable by word depth
• IDT72403 have Output Enable pin to enable output data
• 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 available
(plastic packages only)
Depthexpansionisaccomplishedbytyingthedatainputsofonedeviceto
thedataoutputs oftheprevious device.TheIRpinofthereceivingdeviceis
connectedtotheSOpinofthesendingdeviceandtheORpinofthesending
device is connectedtothe ShiftIn(SI)pinofthe receivingdevice.
Readingandwritingoperationsarecompletelyasynchronousallowingthe
FIFOtobe usedas a bufferbetweentwodigitalmachines ofwidelyvarying
operatingfrequencies.The45MHzspeedmakestheseFlFOsidealforhigh-
speed communicationandcontrollerapplications.
Militarygradeproductismanufacturedincompliancewiththelatestrevision
of MIL-STD-883, Class B.
DESCRIPTION:
The IDT72401 and IDT72403 are asynchronous high-performance
First-ln/First-Outmemoriesorganized64wordsby4bits. TheIDT72403 also
FUNCTIONALBLOCKDIAGRAM
INPUT
CONTROL
LOGIC
WRITE POINTER
SI
IR
OUTPUT
ENABLE
OE
WRITE MULTIPLEXER
(IDT72403 only)
MEMORY
ARRAY
D0-3
DATA IN
DATA IN
Q0-3
MASTER
RESET
READ MULTIPLEXER
READ POINTER
SO
OR
MR
MASTER
RESET
2747 drw01
IDTandtheIDTlogoaretrademarksofIntegratedDeviceTechnology,Inc.
FASTisatrademarkofNationalSemiconductor,Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
OCTOBER 2005
1
© 2005 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DSC-2747/10