IDT7281L25SOI [IDT]
FIFO, 512X9, 25ns, Asynchronous, CMOS, PDSO28, SOIC-28;型号: | IDT7281L25SOI |
厂家: | INTEGRATED DEVICE TECHNOLOGY |
描述: | FIFO, 512X9, 25ns, Asynchronous, CMOS, PDSO28, SOIC-28 先进先出芯片 光电二极管 |
文件: | 总14页 (文件大小:143K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
CMOS ASYNCHRONOUS FIFO
256 x 9, 512 x 9 and 1,024 x 9
IDT7200L
IDT7201LA
IDT7202LA
FEATURES:
DESCRIPTION:
•
•
•
•
•
First-In/First-Out dual-port memory
256 x 9 organization (IDT7200)
512 x 9 organization (IDT7201)
1,024 x 9 organization (IDT7202)
Low power consumption
TheIDT7200/7201/7202aredual-portmemoriesthatloadandemptydata
onafirst-in/first-outbasis. ThedevicesuseFullandEmptyflagstopreventdata
overflowandunderflowandexpansionlogictoallowforunlimitedexpansion
capabilityinbothwordsizeanddepth.
The reads and writes are internally sequential through the use of ring
pointers,withnoaddressinformationrequiredtoloadandunloaddata. Data
istoggledinandoutofthedevicesthroughtheuseoftheWrite(W)andRead
(R) pins.
Thedevicesutilizea9-bitwidedataarraytoallowforcontrolandparitybits
attheuser’soption. Thisfeatureisespeciallyusefulindatacommunications
applicationswhereitisnecessarytouseaparitybitfortransmission/reception
errorchecking. ItalsofeaturesaRetransmit(RT)capabilitythatallowsforreset
of the read pointer to its initial position when RT is pulsed LOW to allow for
retransmissionfromthebeginningofdata. AHalf-FullFlagisavailableinthe
singledevicemodeandwidthexpansionmodes.
— Active: 440mW (max.)
—Power-down: 28mW (max.)
•
•
•
•
•
•
•
•
•
Ultra high speed—12ns access time
Asynchronous and simultaneous read and write
Fully expandable by both word depth and/or bit width
Pin and functionally compatible with 720X family
Status Flags: Empty, Half-Full, Full
Auto-retransmit capability
High-performance CEMOS™ technology
Military product compliant to MIL-STD-883, Class B
Standard Military Drawing #5962-87531, 5962-89666, 5962-89863
and 5962-89536 are listed on this function
TheseFIFOs arefabricatedusingIDT’s high-speedCMOStechnology.
They are designed for those applications requiring asynchronous and
•
Dual versions available in the TSSOP package. For more informa- simultaneous read/writes in multiprocessing and rate buffer applications.
tion, see IDT7280/7281/7282 data sheet
IDT7280 = 2 x IDT7200
Militarygradeproductismanufacturedincompliancewiththelatestrevisionof
MIL-STD-883, Class B.
IDT7281 = 2 x IDT7201
IDT7282 = 2 x IDT7202
•
Industrial temperature range (–40oC to +85oC) is available
(plastic packages only)
FUNCTIONAL BLOCK DIAGRAM
DATA INPUTS
(D0-D8)
WRITE
CONTROL
W
RAM
ARRAY
256 x 9
WRITE
POINTER
READ
POINTER
512 x 9
1,024 x 9
THREE-
STATE
BUFFERS
RS
DATA OUTPUTS
READ
(Q0-Q8)
RESET
LOGIC
R
CONTROL
FLAG
LOGIC
EF
FF
FL/RT
EXPANSION
LOGIC
2679 drw 01
XO/HF
XI
IDTandtheIDTlogoaretrademarksofIntegratedDeviceTechnology,Inc.
SEPTEMBER 2002
COMMERCIAL, INDUSTRIAL AND MILITARY TEMPERATURE RANGES
1
2002 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
DSC-2679/10
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
PIN CONFIGURATIONS
INDEX
W
1
28
27
26
25
24
23
22
21
20
19
18
17
16
15
VCC
D8
2
D4
4
3
2
32 31 30
1
D3
3
D5
D
2
5
29
28
27
26
25
24
23
22
21
D6
D2
4
D6
D1
6
D7
D1
5
D7
D0
7
NC
XI
8
FL/RT
RS
D0
6
FL/RT
RS
FF
9
XI
7
EF
Q0
10
11
12
13
FF
EF
8
Q1
XO/HF
Q0
9
XO/HF
NC
Q7
Q1
10
11
12
13
14
Q7
Q2
Q6
Q2
Q6
14 15 16 17 18 19 20
Q3
Q5
Q8
Q4
R
2679 drw 02b
GND
2679 drw 02a
Reference
Identifier
Order
Code
Reference
Identifier
Order
Code
PackageType
Package Type
(1)
PLASTIC DIP(1)
PLASTIC THIN DIP
CERDIP(1)
THIN CERDIP
SOIC
P28-1
P28-2
D28-1
D28-3
SO28-3
P
TP
D
TD
SO
LCC
L32- 1
J32-1
L
J
PLCC
TOP VIEW
TOP VIEW
NOTE:
1. The 600-mil-wide DIP (P28-1 and D28-1) and LCC are not available for the IDT7200.
RECOMMENDED DC OPERATING
CONDITIONS
Symbol
VCC
Parameter
SupplyVoltage
Min. Typ. Max. Unit
4.5
5.0
5.5
V
ABSOLUTE MAXIMUM RATINGS
Commercial/Industrial/Military
SupplyVoltage
Symbol
Rating
Com’l & Ind'l
Mil.
Unit
GND
0
0
0
V
V
V
V
VTERM
TerminalVoltage
withRespect
to GND
–0.5 to +7.0
–0.5 to +7.0
V
(1)
VIH
InputHighVoltageCom'l/Ind'l
InputHighVoltageMilitary
InputLowVoltage
Commercial/Industrial/Military
OperatingTemperatureCommercial
OperatingTemperatureIndustrial
OperatingTemperatureMilitary
2.0
2.2
—
—
—
—
—
—
0.8
(1)
VIH
(2)
VIL
TSTG
IOUT
Storage
–55to+125
–50to+50
–65to+155
–50to+50
°C
Temperature
TA
TA
TA
0
–40
–55
—
—
—
70
85
125
°C
°C
°C
DCOutput
Current
mA
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
NOTES:
1. For RT/RS/XI input, VIH = 2.6V (commercial).
For RT/RS/XI input, VIH = 2.8V (military).
2. 1.5V undershoots are allowed for 10ns once per cycle.
2
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
DCELECTRICALCHARACTERISTICS
(Commercial: VCC = 5V ± 10%, TA = 0oC to +70oC; Industrial: VCC = 5V ± 10%, TA = –40oC to +85oC; Military: VCC = 5V ± 10%, TA = –55oC to +125oC)
IDT7200L
IDT7201LA
IDT7200L
IDT7201LA
IDT7202LA
Com'l & Ind'l(1)
IDT7202LA
Military(2)
tA = 12, 15, 20, 25, 35, 50 ns
tA = 20, 30, 50, 80 ns
Symbol
Parameter
Min.
Max.
Min.
Max.
Unit
(3)
ILI
InputLeakageCurrent(AnyInput)
OutputLeakageCurrent
–1
–10
2.4
—
—
—
1
10
—
0.4
80
5
–10
–10
2.4
—
10
10
µ A
µ A
V
(4)
ILO
VOH
VOL
Output Logic “1” Voltage IOH = –2mA
Output Logic “0” Voltage IOL = 8mA
Active Power Supply Current
—
0.4
100
15
V
(5,6,7)
ICC1
ICC2
—
mA
mA
(5,8)
StandbyCurrent(R=W=RS=FL/RT=VIH)
—
NOTES:
1. Industrial temperature range product for the 15ns and 25 ns speed grades are available as a standard device.
2. Military speed grades of 50ns and 80ns are only available for the IDT7201LA.
3. Measurements with 0.4 ≤ VIN ≤ VCC.
4. R ≥ VIH, 0.4 ≤ VOUT ≤ VCC.
5. Tested with outputs open (IOUT = 0).
6. Tested at f = 20 MHz.
7. Typical ICC1 = 15 + 2*fS + 0.02*CL*fS (in mA) with VCC = 5V, TA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2, CL = capacitive
load (in pF).
8. All Inputs = VCC - 0.2V or GND + 0.2V.
CAPACITANCE(TA = +25°C, f = 1.0 MHz)
Symbol
Parameter
Condition
Max.
Unit
pF
CIN
InputCapacitance
OutputCapacitance
VIN = 0V
8
8
COUT
VOUT = 0V
pF
5V
NOTE:
1. Characterized values, not currently tested.
1.1K
TO
OUTPUT
PIN
30pF*
AC TEST CONDITIONS
Input Pulse Levels
680Ω
GND to 3.0V
5ns
InputRise/FallTimes
2679 drw 03
InputTimingReferenceLevels
OutputReferenceLevels
OutputLoad
1.5V
1.5V
or equivalent circuit
SeeFigure1
Figure 1. Output Load
* Includes scope and jig capacitances.
3
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
ACELECTRICALCHARACTERISTICS(1)
(Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = –40°C to +85°C; Military: VCC = 5V ± 10%, TA = –55°C to +125°C)
(2)
(2)
Commercial
Com'l & Ind'l
Com'l & Mil.
Com'l & Ind'l
IDT7200L12
IDT7201LA12
IDT7202LA12
IDT7200L15
IDT7201LA15
IDT7202LA15
IDT7200L20
IDT7201LA20
IDT7202LA20
IDT7200L25
IDT7201LA25
IDT7202LA25
Symbol Parameter
Min.
Max.
50
Min.
Max.
40
Min.
Max.
33.3
—
20
Min.
—
35
—
10
25
3
Max.
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tS
ShiftFrequency
—
20
—
8
—
25
—
10
15
3
—
30
—
10
20
3
28.5
—
25
tRC
ReadCycleTime
AccessTime
—
12
—
15
tA
tRR
ReadRecoveryTime
—
—
—
—
—
12
—
—
—
—
—
15
—
—
—
—
—
15
—
—
—
—
—
18
(3)
tRPW
tRLZ
tWLZ
tDV
ReadPulseWidth
12
3
(4)
Read Pulse Low to Data Bus at Low Z
(4,5)
WritePulseHightoDataBusatLowZ
DataValidfromReadPulseHigh
5
5
5
5
5
5
5
5
(4)
tRHZ
tWC
tWPW
tWR
tDS
ReadPulseHightoDataBus atHighZ
—
20
12
8
—
25
15
10
11
0
—
30
20
10
12
0
—
35
25
10
15
0
WriteCycleTime
—
—
—
—
—
—
—
—
—
—
—
—
—
12
—
—
—
—
—
—
—
—
—
—
—
—
—
25
—
—
—
—
—
—
—
—
—
—
—
—
—
30
—
—
—
—
—
—
—
—
—
—
—
—
—
35
(3)
WritePulseWidth
WriteRecoveryTime
DataSet-upTime
DataHoldTime
9
tDH
0
tRSC
tRS
ResetCycleTime
20
12
12
8
25
15
15
10
25
15
15
10
—
—
—
—
—
15
—
—
—
—
15
—
—
15
10
10
30
20
20
10
30
20
20
10
—
—
—
—
—
20
—
—
—
—
20
—
—
20
10
10
35
25
25
10
35
25
25
10
—
—
—
—
—
25
—
—
—
—
25
—
—
25
10
10
(3)
ResetPulseWidth
tRSS
tRSR
tRTC
tRT
ResetSet-upTime(4)
ResetRecoveryTime
RetransmitCycleTime
20
12
12
8
(3)
RetransmitPulseWidth
tRTS
tRTR
tEFL
RetransmitSet-upTime(4)
RetransmitRecoveryTime
ResettoEmptyFlagLow
—
—
—
—
—
12
—
—
—
—
12
—
—
12
8
tHFH,FFH ResettoHalf-FullandFullFlagHigh
17
25
30
35
tRTF
tREF
tRFF
tRPE
tWEF
tWFF
tWHF
tRHF
tWPF
tXOL
tXOH
tXI
RetransmitLowtoFlagsValid
Read Low to Empty Flag Low
ReadHightoFullFlagHigh
ReadPulseWidthafterEFHigh
WriteHightoEmptyFlagHigh
WriteLowtoFullFlagLow
WriteLowtoHalf-FullFlagLow
ReadHightoHalf-FullFlagHigh
WritePulseWidthafterFFHigh
Read/WritetoXOLow
20
25
30
35
12
15
20
25
14
15
20
25
—
12
—
15
—
20
—
25
14
15
20
25
17
25
30
35
17
25
30
35
—
12
—
15
—
20
—
25
Read/WritetoXOHigh
XI PulseWidth(3)
12
15
20
25
—
—
—
—
—
—
—
—
—
—
—
—
tXIR
XI Recovery Time
tXIS
XISet-upTime
8
NOTES:
1. Timings referenced as in AC Test Conditions.
2. Industrial temperature range product for 15ns and 25ns speed grades are available as a standard device.
3. Pulse widths less than minimum value are not allowed.
4. Values guaranteed by design, not currently tested.
5. Only applies to read data flow-through mode
4
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
ACELECTRICALCHARACTERISTICS(1) (Continued)
(Commercial: VCC = 5V ± 10%, TA = 0°C to +70°C; Industrial: VCC = 5V ± 10%, TA = –40°C to +85°C; Military: VCC = 5V ± 10%, TA = –55°C to +125°C)
Military
Commercial
Com'l & Mil.(2)
Military(2)
IDT7200L30
IDT7201LA30
IDT7202LA30
IDT7200L35
IDT7201LA35
IDT7202LA35
IDT7200L50
IDT7201LA50
IDT7202LA50
IDT7201LA80
Symbol
tS
Parameter
Min.
—
40
—
10
30
3
Max.
25
Min.
—
45
—
10
35
3
Max.
Min.
—
65
—
15
50
3
Max.
Min.
—
100
—
20
80
3
Max.
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ShiftFrequency
ReadCycleTime
AccessTime
22.2
—
35
15
—
50
—
—
—
—
—
30
—
—
—
—
—
—
—
—
—
—
—
—
—
65
65
65
45
45
—
45
45
65
65
—
50
50
—
—
—
10
—
80
tRC
—
30
tA
tRR
ReadRecoveryTime
—
—
—
—
—
20
—
—
—
—
—
20
—
—
—
—
—
30
(3)
tRPW
tRLZ
tWLZ
tDV
ReadPulseWidth
(4)
Read Pulse Low to Data Bus at Low Z
(4, 5)
WritePulseHightoDataBus atLowZ
DataValidfromReadPulseHigh
5
5
5
5
5
5
5
5
(4)
tRHZ
tWC
ReadPulseHightoDataBus atHighZ
WriteCycleTime
—
40
30
10
18
0
—
45
35
10
18
0
—
65
50
15
30
5
—
100
80
20
40
10
100
80
80
20
100
80
80
20
—
—
—
—
—
80
—
—
—
—
80
—
—
80
10
15
—
—
—
—
—
—
—
—
—
—
—
—
—
40
—
—
—
—
—
—
—
—
—
—
—
—
—
45
—
—
—
—
—
—
—
—
—
—
—
—
—
100
100
100
60
(3)
tWPW
tWR
WritePulseWidth
WriteRecoveryTime
DataSet-upTime
DataHoldTime
tDS
tDH
tRSC
tRS
ResetCycleTime
40
30
30
10
40
30
30
10
—
—
—
—
—
30
—
—
—
—
30
—
—
30
10
10
45
35
35
10
45
35
35
10
—
—
—
—
—
35
—
—
—
—
35
—
—
35
10
10
65
50
50
15
65
50
50
15
—
—
—
—
—
50
—
—
—
—
50
—
—
50
10
15
(3)
ResetPulseWidth
tRSS
tRSR
tRTC
tRT
ResetSet-upTime(4)
ResetRecoveryTime
RetransmitCycleTime
(3)
RetransmitPulseWidth
tRTS
tRTR
tEFL
tHFH,FFH
tRTF
tREF
tRFF
tRPE
tWEF
tWFF
tWHF
tRHF
tWPF
tXOL
tXOH
tXI
RetransmitSet-upTime(4)
RetransmitRecoveryTime
ResettoEmptyFlagLow
ResettoHalf-FullandFullFlagHigh
RetransmitLowtoFlagsValid
Read Low to Empty Flag Low
ReadHightoFullFlagHigh
ReadPulseWidthafterEFHigh
WriteHightoEmptyFlagHigh
WriteLowtoFullFlagLow
WriteLowtoHalf-FullFlagLow
ReadHightoHalf-FullFlagHigh
WritePulseWidthafterFFHigh
Read/WritetoXOLow
40
45
40
45
30
30
30
30
60
—
30
—
30
—
60
30
30
60
40
45
100
100
—
80
40
45
—
30
—
35
Read/WritetoXOHigh
30
35
80
XI PulseWidth(3)
—
—
—
—
—
—
—
—
—
tXIR
XI Recovery Time
tXIS
XISet-upTime
NOTES:
1. Timings referenced as in AC Test Conditions
2. Military speed grades of 50ns and 80ns are only available for IDT7201LA.
3. Pulse widths less than minimum value are not allowed.
4. Values guaranteed by design, not currently tested.
5. Only applies to read data flow-through mode.
5
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
DeviceMode,thispinactsastheretransmitinput. TheSingleDeviceModeis
initiated by grounding the Expansion In (XI).
SIGNALDESCRIPTIONS
The IDT7200/7201A/7202A can be made to retransmit data when the
RetransmitEnablecontrol(RT)inputispulsedLOW. Aretransmitoperationwill
settheinternalreadpointertothefirstlocationandwillnotaffectthewritepointer.
Read Enable (R) and Write Enable (W) must be in the HIGH state during
retransmit. This feature is useful when less than 256/512/1,024 writes are
performedbetweenresets. Theretransmitfeatureisnotcompatiblewiththe
DepthExpansionModeandwillaffecttheHalf-FullFlag(HF),dependingon
therelativelocationsofthereadandwritepointers.
INPUTS:
DATA IN (D0 – D8)
Data inputs for 9-bit wide data.
CONTROLS:
RESET (RS)
ResetisaccomplishedwhenevertheReset(RS)inputis takentoaLOW
state. During reset, both internal read and write pointers are set to the first
location. Aresetisrequiredafterpowerupbeforeawriteoperationcantake
place. Both the Read Enable (R) and Write Enable (W) inputs must be
in the HIGH state during the window shown in Figure 2, (i.e., tRSS
before the rising edge of RS) and should not change until tRSR after
the rising edge of RS. Half-Full Flag (HF) will be reset to HIGH after
Reset (RS).
EXPANSION IN (XI)
Thisinputisadual-purposepin. ExpansionIn(XI)isgroundedtoindicate
an operation in the single device mode. Expansion In (XI) is connected to
ExpansionOut(XO)ofthe previous device inthe DepthExpansionorDaisy
Chain Mode.
OUTPUTS:
WRITE ENABLE (W)
FULL FLAG (FF)
AwritecycleisinitiatedonthefallingedgeofthisinputiftheFullFlag(FF)
isnotset. Dataset-upandholdtimesmustbeadheredtowithrespecttotherising
edgeoftheWriteEnable(W). DataisstoredintheRAMarraysequentiallyand
independently of any on-going read operation.
After half of the memory is filled and at the falling edge of the next write
operation,theHalf-FullFlag(HF)willbesettoLOWandwillremainsetuntilthe
differencebetweenthewritepointerandreadpointeris less thanorequalto
onehalfofthetotalmemoryofthedevice. TheHalf-FullFlag(HF)isthenreset
by the rising edge of the read operation.
Topreventdataoverflow,theFullFlag(FF)willgoLOW,inhibitingfurther
write operations. Upon the completion of a valid read operation, the Full
Flag(FF)willgoHIGHaftertRFF,allowingavalidwritetobegin. WhentheFIFO
isfull,theinternalwritepointerisblockedfromW,soexternalchangesinWwill
notaffecttheFIFOwhenitisfull.
TheFullFlag(FF)willgoLOW,inhibitingfurtherwriteoperation,whenthe
write pointer is one location less than the read pointer, indicating that the
device is full. Ifthe readpointeris notmovedafterReset(RS), the Full-Flag
(FF)willgoLOWafter256writesforIDT7200,512writesfortheIDT7201Aand
1,024writes forthe IDT7202A.
EMPTY FLAG (EF)
TheEmptyFlag(EF)willgoLOW,inhibitingfurtherreadoperations,when
the read pointer is equal to the write pointer, indicating that the device is
empty.
EXPANSION OUT/HALF-FULL FLAG (XO/HF)
This is a dual-purpose output. In the single device mode, when
Expansion In (XI) is grounded, this output acts as an indication of a half-full
memory.
After half of the memory is filled and at the falling edge of the next write
operation,theHalf-FullFlag(HF)willbesetLOWandwillremainsetuntilthe
difference between the write pointer and read pointer is less than or equal
toone halfofthe totalmemoryofthe device. The Half-FullFlag(HF)is then
reset by using rising edge of the read operation.
IntheDepthExpansionMode,ExpansionIn(XI)isconnectedtoExpansion
Out(XO)ofthepreviousdevice.Thisoutputactsasasignaltothenextdevice
intheDaisyChainbyprovidingapulsetothenextdevicewhentheprevious
devicereachesthelastlocationofmemory.
READ ENABLE (R)
AreadcycleisinitiatedonthefallingedgeoftheReadEnable(R)provided
theEmptyFlag(EF)isnotset. ThedataisaccessedonaFirst-In/First-Outbasis,
independent of any ongoing write operations. After Read Enable (R) goes
HIGH,theDataOutputs(Q0–Q8)willreturntoahighimpedanceconditionuntil
thenextReadoperation. WhenalldatahasbeenreadfromtheFIFO,theEmpty
Flag(EF)willgoLOW,allowingthe“final”readcyclebutinhibitingfurtherread
operationswiththedataoutputsremaininginahighimpedancestate. Oncea
validwriteoperationhasbeenaccomplished,theEmptyFlag(EF)willgoHIGH
aftertWEFandavalidReadcanthenbegin. WhentheFIFOisempty,theinternal
readpointerisblockedfromRsoexternalchangesinRwillnotaffecttheFIFO
whenitisempty.
DATA OUTPUTS (Q0 – Q8)
Dataoutputsfor9-bitwidedata. Thisdataisinahighimpedancecondition
whenever Read (R) is in a HIGH state.
FIRST LOAD/RETRANSMIT (FL/RT)
This is a dual-purpose input. In the Depth Expansion Mode, this pin is
groundedtoindicatethatitisthefirstloaded(seeOperatingModes). IntheSingle
6
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
tRSC
tRS
RS
W
tRSR
tRSS
tRSS
R
tEFL
EF
tHFH , tFFH
HF, FF
2679 drw 04
NOTES:
1. EF, FF, HF may change status during Reset, but flags will be valid at tRSC.
2. W and R = VIH around the rising edge of RS.
Figure 2. Reset
tRC
tRPW
tRR
tA
tA
R
tDV
tRHZ
tRLZ
Q0-Q8
DATA OUT VALID
DATA OUT VALID
tWC
tWPW
tWR
W
tDS
tDH
D0-D8
DATA IN VALID
DATA IN VALID
2679 drw 05
Figure 3. Asynchronous Write and Read Operation
FIRST
WRITE
LAST WRITE
IGNORED
WRITE
FIRST READ
ADDITIONAL
READS
R
W
t
WFF
t
RFF
2679 drw 06
FF
Figure 4. Full Flag From Last Write to First Read
7
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
LAST READ
IGNORED
READ
FIRST WRITE
ADDITIONAL
WRITES
FIRST READ
W
R
EF
tWEF
t
REF
tA
DATA OUT
VALID
VALID
2679 drw 07
Figure 5. Empty Flag From Last Read to First Write
t
RTC
tRT
RT
W,R
t
RTS
tRTR
t
RTF
HF, EF, FF
FLAG VALID
2679 drw 08
Figure 6. Retransmit
W
EF
R
t
WEF
tRPE
2679 drw 09
Figure 7. Minimum Timing for an Empty Flag Coincident Read Pulse
R
FF
W
t
RFF
tWPF
2679 drw 10
Figure 8. Minimum Timing for a Full Flag Coincident Write Pulse
8
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
W
R
tRHF
tWHF
HALF-FULL OR LESS
HALF-FULL OR LESS
MORE THAN HALF-FULL
HF
2679 drw 11
Figure 9. Half-Full Flag Timing
WRITE TO
LAST PHYSICAL
LOCATION
READ FROM
LAST PHYSICAL
LOCATION
W
R
tXOL
tXOH
tXOH
tXOL
2679 drw 12
XO
Figure 10. Expansion Out
tXIR
tXI
XI
tXIS
WRITE TO
FIRST PHYSICAL
LOCATION
W
R
tXIS
READ FROM
FIRST PHYSICAL
LOCATION
2679 drw 13
Figure 11. Expansion In
depthcanbeattainedbyaddingadditionalIDT7200/7201A/7202As. These
FIFOs operateintheDepthExpansionmodewhenthefollowingconditions
are met:
OPERATINGMODES:
Care must be taken to assure that the appropriate flag is monitored by
eachsystem(i.e.FFismonitoredonthedevicewhereWisused;EFismonitored
onthedevicewhereRisused).Foradditionalinformation,refertoTechNote
8: OperatingFIFOsonFullandEmptyBoundaryConditions andTechNote
1. ThefirstdevicemustbedesignatedbygroundingtheFirstLoad(FL)control
input.
2. Allotherdevices musthave FLinthe HIGHstate.
3. TheExpansionOut(XO)pinofeachdevicemustbetiedtotheExpansion
In (XI) pin of the next device. See Figure 14.
4. ExternallogicisneededtogenerateacompositeFullFlag(FF)andEmpty
Flag (EF). This requires the ORing of all EFs and ORing of all FFs (i.e.
allmustbesettogeneratethecorrectcompositeFF orEF). SeeFigure
14.
6: Designing with FIFOs.
SINGLE DEVICE MODE
A single IDT7200/7201A/7202A may be used when the application
requirements are for 256/512/1,024 words or less. These devices are in a
Single Device Configuration when the Expansion In (XI) control input is
grounded (see Figure 12).
5. TheRetransmit(RT)functionandHalf-FullFlag(HF)arenotavailablein
theDepthExpansionMode.
DEPTH EXPANSION
TheIDT7200/7201A/7202Acaneasilybeadaptedtoapplications when
the requirements are for greater than 256/512/1,024 words. Figure 14
demonstrates Depth Expansion using three IDT7200/7201A/7202As. Any
For additional information, refer to Tech Note 9: Cascading FIFOs or
FIFO Modules.
9
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
theFIFOpermitsareadingofasinglewordafterwritingonewordofdatainto
anemptyFIFO. Thedataisenabledonthebusin(tWEF+tA)nsaftertherising
edgeofW,calledthefirstwriteedge,anditremainsonthebusuntiltheRline
is raisedfromLOW-to-HIGH,afterwhichthebus wouldgointoathree-state
mode after tRHZ ns. The EF line would have a pulse showing temporary
deassertionandthenwouldbeasserted.
In the write flow-through mode (Figure 18), the FIFO permits the writing
of a single word of data immediately after reading one word of data from a
fullFIFO. TheRlinecausestheFFtobedeassertedbuttheWlinebeingLOW
causesittobeassertedagaininanticipationofanewdataword. Ontherising
edge of W, the new word is loaded in the FIFO. The W line must be toggled
whenFFisnotassertedtowritenewdataintheFIFOandtoincrementthewrite
pointer.
USAGEMODES:
WIDTH EXPANSION
Word width may be increased simply by connecting the corresponding
inputcontrolsignalsofmultipledevices. Statusflags(EF,FFandHF)canbe
detectedfromanyonedevice. Figure13demonstratesan18-bitwordwidth
by using two IDT7200/7201A/7202As. Any word width can be attained by
addingadditionalIDT7200/7201A/7202As (Figure 13).
BIDIRECTIONAL OPERATION
Applications which require data buffering between two systems (each
system capable of Read and Write operations) can be achieved by pairing
IDT7200/7201A/7202AsasshowninFigure16.BothDepthExpansionand
Width Expansion may be used in this mode.
COMPOUND EXPANSION
Thetwoexpansiontechniquesdescribedabovecanbeappliedtogether
in a straightforward manner to achieve large FIFO arrays (see Figure 15).
DATA FLOW-THROUGH
Two types of flow-through modes are permitted, a read flow-through
and write flow-through mode. For the read flow-through mode (Figure 17),
(HALF-FULL FLAG)
WRITE (W)
(HF)
READ (R)
9
9
IDT
DATA OUT (Q)
DATA IN (D)
FULL FLAG (FF)
RESET (RS)
7200/
7201A/
7202A
EMPTY FLAG (EF)
RETRANSMIT (RT)
EXPANSION IN (XI)
2679 drw 14
Figure 12. Block Diagram of Single 256 x 9, 512 x 9, 1,024 x 9 FIFO
HF
HF
18
9
9
IN
DATA (D)
IDT
WRITE (W)
FULL FLAG (FF)
RESET (RS)
READ (R)
7200/
7201A/
7202A
IDT
EMPTY FLAG (EF)
7200/
7201A/
7202A
RETRANSMIT (RT)
9
9
XI
XI
18
DATA OUT (Q)
2679 drw 15
Figure 13. Block Diagram of 256 x 18, 512 x 18, 1,024 x 18 FIFO Memory Used in Width Expansion Mode
10
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
TABLE 1 — RESET AND RETRANSMIT
Single Device Configuration/Width Expansion Mode
Inputs
InternalStatus
Write Pointer
Outputs
Mode
RS
RT
XI
Read Pointer
EF
FF
HF
Reset
0
1
1
X
0
0
0
0
LocationZero
LocationZero
Increment(1)
LocationZero
Unchanged
Increment(1)
0
1
1
Retransmit
Read/Write
X
X
X
X
X
X
1
NOTE:
1. Pointer will increment if flag is HIGH.
TABLE 2 — RESET AND FIRST LOAD TRUTH TABLE
Depth Expansion/Compound Expansion Mode
Inputs
InternalStatus
Write Pointer
Outputs
Mode
RS
FL
XI
Read Pointer
EF
FF
ResetFirstDevice
Reset All Other Devices
Read/Write
0
0
1
0
1
(1)
(1)
(1)
LocationZero
LocationZero
X
LocationZero
LocationZero
X
0
0
1
1
X
X
X
NOTE:
1. XI is connected to XO of previous device. See Figure 14. RS = Reset Input, FL/RT = First Load/Retransmit, EF = Empty Flag Output, FF = Full Flag Output,
XI = Expansion Input, HF = Half-Full Flag Output
XO
R
W
FF
EF
FL
IDT
7200/
7201A/
7202A
9
9
9
Q
V
D
CC
XI
XO
FF
EF
FL
IDT
EMPTY
FULL
7200/
7201A/
7202A
9
XI
XO
FF
EF
IDT
7200/
7201A/
7202A
9
RS
FL
XI
2678 drw16
Figure 14. Block Diagram of 768 x 9, 1,536 x 9, 3,072 x 9 FIFO Memory (Depth Expansion)
11
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
Q
0-
Q
8
Q
9-
Q
17
17
Q
(N-8)-Q
n
Q9-
Q
Q0-
Q
8
Q(N-8)-Q
n
IDT7200/
IDT7200/
IDT7200/
IDT7201A/
IDT7202A
DEPTH
IDT7201A/
IDT7202A
DEPTH
IDT7201A/
IDT7202A
DEPTH
R, W, RS
EXPANSION
BLOCK
EXPANSION
BLOCK
EXPANSION
BLOCK
D0-D8
D9-D17
D(N-8)-DN
D0-DN
2679 drw 17
D9-DN
D18-DN
D(N-8)-DN
NOTES:
1. For depth expansion block see section on Depth Expansion and Figure 14.
2. For Flag detection see section on Width Expansion and Figure 13.
Figure 15. Compound FIFO Expansion
W
A
RB
EF
HF
IDT
B
7200/
7201A/
B
FFA
7202A
DA 0-8
QB 0-8
SYSTEM A
SYSTEM B
QA 0-8
DB 0-8
IDT
7200/
7201A/
7202A
R
A
W
B
HFA
FF
B
2679 drw 18
EFA
Figure 16. Bidirectional FIFO Mode
12
IDT7201L/7201LA/7202LACMOSASYNCHRONOUSFIFO
256 x 9, 512 x 9 and 1,024 x 9
COMMERCIAL,INDUSTRIALANDMILITARY
TEMPERATURERANGES
IN
DATA
W
R
tRPE
EF
t
REF
tWEF
tWLZ
tA
DATA OUT
OUT
DATA
VALID
2679 drw 19
Figure 17. Read Data Flow-Through Mode
R
tWPF
W
t
RFF
FF
tDH
t
WFF
IN
DATA
VALID
IN
DATA
tDS
tA
OUT
DATA
OUT
DATA
VALID
2679 drw 20
Figure 18. Write Data Flow-Through Mode
13
ORDERING INFORMATION
IDT
XXXX
X
XXX
X
X
Device Type Power Speed Package
Process/
Temperature
Range
Blank
I(1)
B
Commercial (0oC to +70oC)
Industrial (-40oC to +85oC)
Military (-55oC to +125oC)
Compliant to MIL-STD-883, Class B
P
TP
D
TD
J
SO
L
Plastic DIP
Plastic Thin DIP
CERDIP
Thin CERDIP
Plastic Leaded Chip Carrier
SOIC
P28-1
P28-2
D28-1
D28-3
J32-1
SO28-3
L32-1
(7201 & 7202 Only)
(7201 & 7202 Only)
PLCC
LCC
Leadless Chip Carrier
(7201 & 7202 Only)
12
15
20
25
30
35
50
80
Commercial Only
Commercial and Industrial
Commercial and Military
Commercial and Industrial
Military Only
Commercial Only
Commercial and (Military only for 7201)
Military only for 7201
Access Time (t
in Nanoseconds
A) Speed
LA(2)
Low Power
7200
7201
7202
7280
7281
7282
256 x 9-Bit FIFO
512 x 9-Bit FIFO
1,024 x 9-Bit FIFO
256 x 9-Bit DUAL FIFO
512 x 9-Bit DUAL FIFO
1,024 x 9-Bit DUAL FIFO
See 7280/7281/7282
data sheet for details
2679 drw 21
NOTES:
1. Industrial temperature range product is available for the 15ns and 25ns as a standard product.
2. "A" to be included for IDT7201 and IDT7202 ordering part number.
DATASHEETDOCUMENTHISTORY
05/02/2001
pgs. 1, 2, 3, 4, 5 and 14.
CORPORATE HEADQUARTERS
for SALES:
for Tech Support:
408-360-1753
email:FIFOhelp@idt.com
6024 Silver Creek Valley Road
San Jose, CA 95138
800-345-7015 or 408-284-8200
fax: 408-284-2775
www.idt.com
14
相关型号:
IDT7282
CMOS DUAL ASYNCHRONOUS FIFO DUAL 256 x 9, DUAL 512 x 9,DUAL 1,024 x 9, DUAL 2,048 x 9,DUAL 4,096 x 9, DUAL 8,192 x 9
IDT
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