IDT72021 IDT72031 IDT72041 First-In/First-Out Dual-Port memory or

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CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
IDT72021 IDT72031 IDT72041
First-In/First-Out Dual-Port memory organization IDT72021-1K IDT72031-2K IDT72041-4K Ultra high speed IDT72021-25ns access time IDT72031-35ns access time IDT72041-35ns access time Easily expandable word depth and/or width Asynchronous simultaneous read write Functionally equivalent IDT7202/03/04 with Output Enable (OE) Almost Empty/Almost Full Flag (AEF) Four status flags: Full, Empty, Half-Full (single device mode), Almost Empty/Almost Full (7/8 empty full single device mode) Output Enable controls data output port Auto-retransmit capability Available 32-pin PLCC Military product compliant MIL-STD-883, Class
DESCRIPTION:
IDT72021/031/041s high-speed, low-power, dual-port memory devices commonly known FIFOs (First-In/FirstOut). Data written into read from memory independent rates. order information stored extracted does change, rate data entering FIFO might different than rate leaving FIFO. Unlike Static RAM, address information required because read write pointers advance sequentially. IDT72021/ 031/041s perform asynchronous simultaneous read write operations. There four status flags, (HF, AEF) monitor data overflow underflow. Output Enable (OE) provided control flow data through output port. Additional features Write (W), Read (R), Retransmit (RT), First Load (FL), Expansion (XI) Expansion (XO). IDT72021/031/041s designed those applications requiring data control flags Output Enable (OE) multiprocessing rate buffer applications. IDT72021/031/041s fabricated using IDT's CMOS technology. Military grade product manufactured compliance with latest version MIL-STD-883, Class high reliability systems.
FUNCTIONAL BLOCK DIAGRAM
DATA INPUT (D0-D8)
WRITE CONTROL
WRITE POINTER 1024/ 2048/ 4096 THREESTATE BUFFERS
ARRAY 1024 2048 4096
READ POINTER
RESET LOGIC
FL/RT
READ CONTROL FLAG LOGIC EXPANSION LOGIC
DATA OUTPUTS (Q0-Q8)
XO/HF
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logo registered trademark Integrated Device Technology, Inc. FAST trademark National Semiconductor
MILITARY COMMERCIAL TEMPERATURE RANGES
©1996 Integrated Device Technology, Inc. latest information contact IDT's site www.idt.com fax-on-demand 408-492-8391.
DECEMBER 1995
DSC-2677/6
5.30
IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
CONFIGURATIONS
D32-1
INDEX
J32-1
FL/RT XO/HF
FL/RT XO/HF
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PLCC VIEW
VIEW
DESCRIPTIONS
Symbol D0-D8 Name Inputs Reset Data inputs 9-bit wide data. When LOW, internal READ WRITE pointers first location array. HIGH, LOW. reset required before initial WRITE after power-up. must HIGH during cycle. When WRITE LOW, data written into array sequentially, independent READ. order WRITE active, must HIGH. When FIFO full (FF-LOW), internal WRITE operation blocked. When READ LOW, data read from array sequentially, independent WRITE. order READ active, must HIGH. When FIFO empty (EF-LOW), internal READ operation blocked. three-state output buffer controlled read signal external output control (OE). Description
FL/RT
Write
Read
First Load/ Retransmit
This dual-purpose input. single device configuration grounded), activating retransmit (FL/RT-LOW) will internal READ pointer first location. There effect WRITE pointer. must HIGH before setting FL/RT LOW. Retransmit compatible with depth expansion. depth expansion configuration, FL/RT-LOW indicates first activated device.
Expansion Output Enable
single device configuration, grounded. depth expansion daisy chain expansion, connected (expansion out) previous device. When HIGH, data flow through three-state output buffer inhibited regardless active READ operation. read operation does increment read pointer this situation. When LOW, Q0-Q8 still HIGH impedance condition READ occurs. complete READ operation with data appearing Q0-Q8, both should asserted LOW. When goes LOW, device full further WRITE operations inhibited. When HIGH, device full. When goes LOW, device empty further READ operations inhibited. When HIGH, device empty. When LOW, device empty full completely full. When HIGH, device greater than full, less than full. This dual purpose output. single device configuration grounded), device more than half full when LOW. depth expansion configuration connected next device), pulse sent from when last location array filled. Data outputs 9-bit wide data.
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XO/HF
Full Flag Empty Flag Almost-Empty/ Almost-Full Flag Expansion Out/ Half-Full Flag
Q0-Q8
Outputs
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
STATUS FLAG
Number Words FIFO 1-127 128-512 513-896 897-1023 1024 1-255 256-1024 1025-1792 1793-2047 2048 1-511 512-2048 2049-3584 3585-4095 4096
CAPACITANCE +25°C, MHz)
Symbol COUT
Parameter(1) Input Capacitance Output Capacitance
Condition VOUT
Max.
Unit
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NOTE: These parameters sampled 100% tested.
RECOMMENDED OPERATING CONDITIONS
Symbol VCCM Parameter Military Supply Voltage Commercial Supply Voltage Supply Voltage Input High Voltage Commercial Input High Voltage Military Input Voltage Commercial Military Min. Typ. Max. Unit
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ABSOLUTE MAXIMUM RATINGS
Symbol Rating VTERM Terminal Voltage with Respect Operating Temperature TBIAS Temperature Under Bias TSTG Storage Temperature IOUT Output Current
Com'l. Mil. Unit -0.5 +7.0 -0.5 +7.0
VCCC
+125
VIL(1)
+125 +135 +125 +155
NOTE: 1.5V undershoots allowed 10ns once cycle.
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NOTE: 2677 Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS cause permanent damage device. This stress rating only functional operation device these other conditions above those indicated operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect reliabilty.
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
ELECTRICAL CHARACTERISTICS IDT72021
(Commercial: 5.0V±10%, +70°C; Military: 5V±10%, -55°C +125°C)
IDT72021 Commercial =25,35ns Symbol ILI(1) ILO(2) ICC1(3,4) ICC2(3) ICC3(3) Parameter Input Leakage Current (Any Input) Output Leakage Current Output Logic Voltage -2mA Output Logic Voltage Active Power Supply Current Standby Current FL/RT VIH) Power Down Current (All Input 0.2V) Min. Typ. Max. IDT72021 Military =30,40ns Min. Typ. Max. IDT72021 Commercial =50ns Min. Typ. Max. IDT72021 Military =50ns Min. Typ. Max. Unit
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ELECTRICAL CHARACTERISTICS IDT72031, IDT72041
(Commercial: 5.0V±10%, +70°C; Military: 5V±10%, -55°C +125°C)
IDT72031 IDT72041 Commercial =35,50ns Symbol ILI(1) ILO(2) ICC1(3,5) ICC2(3) ICC3(3) Parameter Input Leakage Current (Any Input) Output Leakage Current Output Logic Voltage IOUT -2mA Output Logic Voltage IOUT Active Power Supply Current Standby Current FL/RT VIH) Power Down Current (All Input 0.2V) Min. Typ. Max. IDT72031 IDT72041 Military =40,50ns Min. Typ. Max. Unit
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NOTES: Measurements with VCC. VIH, VOUT VCC. measurements made with HIGH. Tested 20MHz. Tested 15.3 MHz.
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
ELECTRICAL CHARACTERISTICS IDT72021(1)
(Commercial: 5.0V±10%, +70°C; Military: 5V±10%, -55°C +125°C)
Com'l 72021L25 Symbol tRPW tRLZ tWLZ tRHZ tWPW tRSC tRSS tRSR tRTC tRTR tRSF1 tRSF2 tREF tRFF tRPE tWEF tWFF tWHF tRHF tWPF tOEHZ tOELZ tAOE Parameter Shift Frequency Min. Max. 28.5 Mil. 72021L30 Min. Max. Com'l 72021L35 Min. Max. 22.2 Mil. 72021L40 Min. Max. Com'l Mil. 72021L50 Min. Max. Unit
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Cycle Time
Access Time
Recovery Time Pulse Width(2) Pulse Data Low-Z(3) Pulse HIGH Data Low-Z(3,4) Data Valid from Pulse HIGH Pulse HIGH Data High-Z(3) Cycle Time Pulse Width(2) Recovery Time
Data Set-up Time Data Hold Time
Cycle Time Pulse Width(2) Set-up Time Recovery Time Cycle Time Pulse Width(2) Recovery Time HIGH HIGH HIGH Pulse Width After HIGH HIGH HIGH HIGH HIGH Pulse Width after HIGH HIGH Transitioning Transitioning HIGH High-Z (Disable)(3) Low-Z (Enable)(3) Data Valid (Q0-Q8)
NOTES: Timings referenced Test Conditions. Pulse widths less than minimum value allowed. Values guaranteed design, currently tested. Only applies read data flow-through mode.
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
ELECTRICAL CHARACTERISTICS IDT72031, IDT72041(1)
(Commercial: 5.0V±10%, +70°C; Military: 5V±10%, -55°C +125°C)
Com'l 72031L35 72041L35 Symbol tRPW tRLZ tWLZ tRHZ tWPW tRSC tRSS tRSR tRTC tRTR tRSF1 tRSF2 tREF tRFF tRPE tWEF tWFF tWHF tRHF tWPF tOEHZ tOELZ tAOE Shift Frequency Parameter Min. Max. 22.2 Mil. 72031L40 72041L40 Min. Max. Com'l Mil. 72031L50 72041L50 Min. Max. Unit
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Cycle Time
Access Time
Recovery Time Pulse Width(2) Pulse Data Low-Z(3) Pulse HIGH Data Low-Z(3,4) Data Valid from Pulse HIGH Pulse HIGH Data High-Z(3) Cycle Time Pulse Width(2) Recovery Time
Data Set-up Time Data Hold Time
Cycle Time Pulse Width(2) Set-up Time Recovery Time Cycle Time Pulse Width(2) Recovery Time HIGH HIGH HIGH Pulse Width After HIGH HIGH HIGH HIGH HIGH Pulse Width after HIGH HIGH Transitioning Transitioning HIGH High-Z (Disable)(3) Low-Z (Enable)(3) Data Valid (Q0-Q8)
NOTES: Timings referenced Test Conditions. Pulse widths less than minimum value allowed. Values guaranteed design, currently tested. Only applies read data flow-through mode.
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
TEST CONDITIONS
Input Pulse Levels Input Rise/Fall Times Input Timing Reference Levels Output Reference Levels Output Load 3.0V 1.5V 1.5V Figure
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1.1K OUTPUT 30pF*
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equivalent circuit
Figure Output Load Includes scope capacitances.
RSF1 AEF, RSF2
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Figure Reset NOTES: change status during Reset, flags will valid tRSC. around rising edge
DATA VALID
DATA VALID
DATA VALID
DATA VALID
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Figure Asynchronous Write Read Operation NOTE: Assume asserted LOW.
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
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LAST WRITE
IGNORED WRITE
FIRST READ
ADDITIONAL READS
FIRST WRITE
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Figure Full Flag From Last Write First Read
LAST READ
IGNORED READ
FIRST WRITE
ADDITIONAL WRITES
FIRST READ
DATA
VALID
VALID
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Figure Empty Flag From Last Read First Write NOTE: Assume asserted LOW.
tRTC
AEF,
Figure Retransmit
FLAG VALID
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
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Figure Empty Flag Timing Figure Almost-Empty/Almost-Full Flag Half-Full Timings
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Figure Full Flag Timing
HALF-FULL
(1/2) HALF-FULL (7/8 FULL)
HALF-FULL (1/2)
ALMOST-FULL (7/8 FULL
(7/8 FULL)
ALMOST-EMPTY (1/8 FULL-1)
(1/8 FULL)
ALMOST-EMPTY (1/8 FULL-1)
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Figure Almost-Empty/Almost-Full Flag Half-Full Timings
TERMINATE READ CYCLE
tRLZ Q0-8
tOEHZ DATA
SECOND READ CONTROLLING tAOE tOELZ DATA
HIGH IMPEDANCE
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Figure Output Enable Read Operation Timings
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
WRITE LAST PHYSICAL LOCATION
MILITARY COMMERCIAL TEMPERATURE RANGES
READ FROM LAST PHYSICAL LOCATION
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Figure Expansion
WRITE FIRST PHYSICAL LOCATION
Figure Expansion
READ FROM FIRST PHYSICAL LOCATION
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OPERATING CONFIGURATIONS
SINGLE DEVICE CONFIGURATION IDT72021/031/041 Single Device Configuration when Expansion (XI) control input grounded (see Figure 13).
(HALF-FULL FLAG) WRITE DATA FULL FLAG (FF) RESET (RS)
READ
72021/031/041
DATA EMPTY FLAG (EF) RETRANSMIT (RT) OUTPUT ENABLE (OE)
EXPANSION (XI)
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Figure Block Diagram Single 1K/2K/4K FIFO
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
WIDTH EXPANSION CONFIGURATION Word width increased simply connecting corresponding input control signals multiple devices. Status flags (EF, AEF) detected from
device. Figure demonstrates 18-bit word width using IDT72021/031/041 devices. word width attained adding additional IDT72021/031/041s.
DATA
OUTPUT ENABLE (OE) WRITE FULL FLAG (FF) RESET (RS) RETRANSMIT (RT) 72021/031/041 72021/031/041 READ EMPTY FLAG (EF)
DATA
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Figure Block Diagram 1K/2K/4K FIFO Memory Used Width Expansion Configuration NOTE: Flag detection accomplished monitoring signals either (any) device used width expansion configuration. connect output signals together.
DEPTH EXPANSION (DAISY CHAIN) MODE IDT72021/031/041 easily adapted applications when requirements greater than 1K/2K/4K words. Figure demonstrates Depth Expansion using three IDT72021/031/041s. depth attained adding additional devices. IDT72021/031/041 operates Depth Expansion configuration when following conditions met: first device must designed grounding First Load (FL) control input. other devices must have HIGH state. Expansion (XO) each device must tied Expansion (XI) next device. Figure External logic needed generate composite Full Flag (FF) Empty Flag (EF). This requires ORing ORing (i.e. must generate correct composite EF). Figure Retransmit (RT) function Half-Full Flag (HF) available Depth Expansion Mode. additional information refer Tech Note "Cascading FIFOs FIFO Modules". COMPOUND EXPANSION MODE expansion techniques described above applied together straight forward manner achieve large FIFO arrays (see Figure 16).
BIDIRECTIONAL MODE Applications which require data buffering between systems (each system capable Read Write operations) achieved pairing IDT72021/031/041s shown Figure Care must taken assure that appropriate flag monitored each system (i.e., monitored device where used; monitored device where used). Both Depth Expansion Width Expansion used this mode. DATA FLOW-THROUGH MODES types flow-through modes permitted: read flow-through write flow-through mode. read flowthrough mode (Figure 18), FIFO permits reading single word after writing word data into empty FIFO. data enabled (tWEF after rising edge called first write edge. remains until line raised from LOW-to-HIGH, after which would into three-state mode after tRHZ line would have pulse showing temporary deassertion then would asserted. interval time that LOW, more words written FIFO (the subsequent writes after first write edge will deassert Empty Flag); however, same word (written first write edge), presented output read pointer, would incremented when LOW. toggling other words that written FIFO will appear output read cycle timings.
5.30
IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
write flow-through mode (Figure 18), FIFO permits writing single word data immediately after reading word data from full FIFO. line causes deasserted line, being causes asserted again anticipation data word. rising edge word loaded FIFO.
line must toggled when asserted write data FIFO increment write pointer. additional information refer Tech Note "Operating FIFOs Full Empty Boundary Conditions" Tech Note "Designing with FIFOs".
TRUTH TABLES TABLE I-RESET RETRANSMIT
Single Device Configuration/Width Expansion Mode
Mode Reset Retransmit Read/Write
Inputs
Internal Status Read Pointer Write Pointer Location Zero Location Zero Location Zero Unchanged Increment(1) Increment(1)
Outputs
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NOTE: Pointer will increment flag HIGH.
TABLE II-RESET FIRST LOAD TRUTH TABLE
Depth Expansion/Compound Expansion Mode
Mode Reset First Device Reset Other Devices Read/Write
Inputs
Internal Status Read Pointer Write Pointer Location Zero Location Zero Location Zero Location Zero
Outputs
NOTE: 2677 connected previous device. Figure Reset Input FL/RT First Load/Retransmit, Empty Flag Output, Flag Full Output, Expansion Input, Half-Full Flag Output, Almost Empty/Almost Full Flag.
72021/ 031/041 FULL 72021/ 031/041
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EMPTY
72021/ 031/041
Figure Block Diagram 3K/6K/12K FIFO Memory (Depth Expansion) NOTE: only guarantees depth expansion with identical part numbers speed. 5.30
IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
IDT72021/ 031/041 DEPTH EXPANSION BLOCK
IDT72021/ 031/041 DEPTH EXPANSION BLOCK
IDT72021/ 031/041 DEPTH EXPANSION BLOCK
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Figure Compound FIFO Expansion NOTES: depth expansion block section Depth Expansion Figure Flag detection section Width Expansion Figure
SYSTEM 72021/ 7201A 031/041
SYSTEM
72021/ 031/041
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Figure Bidirectional FIFO Mode
DATA
DATA
DATA VALID
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Figure Read Data Flow-Through Mode NOTE: Assume asserted LOW.
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IDT72021, IDT72031, IDT72041 CMOS ASYNCHRONOUS FIFO WITH RETRANSMIT
MILITARY COMMERCIAL TEMPERATURE RANGES
DATA DATA
DATA VALID DATA VALID
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Figure Write Data Flow-Through Mode NOTE: Assume asserted LOW.
ORDERING INFORMATION
XXXXX Device Type Power Speed Package Process/ Temperature Range Blank Commercial (0°C to+70°C) Military (-55°C to+125°C) Compliant MIL-STD-883, Class
CERDIP Plastic Leaded Chip Carrier
72021-Com'l. Only 72021-Mil. Only 72021/031/041-Com'l. Only 72021/031/041-Mil. Only 72021/031/041-Com'l Mil.
Access Time (tA) Speed Nanoseconds
72021 72031 72041
Power 1024 9-Bit FIFO 2048 9-Bit FIFO 4096 9-Bit FIFO
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IDT72021 IDT72031 IDT72041 First-In/First-Out Dual-Port memory or

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