IDT7207 FEATURES: 32768 storage capacity High-speed: 20ns ac

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IDT7207 FEATURES: 32768 storage capacity High-speed: 20ns ac

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CMOS ASYNCHRONOUS FIFO 32,768
IDT7207
FEATURES:
32768 storage capacity High-speed: 20ns access time power consumption Active: 660mW (max.) Power-down: 44mW (max.) Asynchronous simultaneous read write Fully expandable both word depth width functionally compatible with IDT720x family Status Flags: Empty, Half-Full, Full Retransmit capability High-performance CMOS technology Military product compliant MIL-STD-883, Class
DESCRIPTION:
IDT7207 monolithic dual-port memory buffer with
internal pointers that load empty data first-in/first-out basis. device uses Full Empty flags prevent data overflow underflow expansion logic allow unlimited expansion capability both word size depth. Data toggled device through Write Read pins. devices 9-bit width provides control parity user's option. also features Retransmit (RT) capability that allows read pointer reset initial position when pulsed LOW. Half-Full Flag available single device width expansion modes. IDT7207 fabricated using IDT's high-speed CMOS technology. designed applications requiring asynchronous simultaneous read/writes multiprocessing, rate buffering, other applications. Military grade product manufactured compliance with latest revision MIL-STD-883, Class
FUNCTIONAL BLOCK DIAGRAM
DATA INPUTS (D0-D8)
WRITE CONTROL
WRITE POINTER
ARRAY 32,768
READ POINTER
THREESTATE BUFFERS
READ CONTROL FLAG LOGIC
DATA OUTPUTS (Q0-Q8)
RESET LOGIC
EXPANSION LOGIC
3140
logo registered trademark Integrated Device Techology, Inc.
MILITARY COMMERCIAL TEMPERATURE RANGES
©1995
AUGUST 1994
DSC-2069/-
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
INDEX
P28-1 D28-1
FL/RT XO/HF
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CONFIGURATIONS
J32-1 L32-1
FL/RT
3140
VIEW
PLCC/LCC VIEW
ABSOLUTE MAXIMUM RATINGS(1)
Symbol VTERM Rating Terminal Voltage with Respect Operating Temperature Temperature Under Bias Storage Temperature Output Current Commercial -0.5 Military -0.5 +7.0 Unit
RECOMMENDED OPERATING CONDITIONS
Symbol VCCM VCCC
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
TBIAS TSTG IOUT
+125
+125 +135 +155
VIH(1) VIL(1)
NOTE: 7207 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 reliability.
NOTE: 1.5V undershoots allowed 10ns once cycle.
7207
ELECTRICAL CHARACTERISTICS 7207
(Commercial: 5.0V±10%, +70°C; Military: 5.0V±10%, -55°C +125°C)
IDT7207 Commercial Symbol ILI(1) ILO(2) ICC1(3) ICC2(3) ICC3(L)(3) Parameter Input Leakage Current (Any Input) Output Leakage Current Output Logic Voltage -2mA Output Logic Voltage Active Power Supply Current Standby Current (R=W=RS=FL/RT=VIH) Power Down Current (All Input 0.2V) Min. Typ. Max.
IDT7207 Military Min. Typ. Max.
Unit
7207
NOTES: Measurements with VCC. VIH, VOUT VCC. measurements made with outputs open (only capacitive loading). Tested 20MHz.
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
ELECTRICAL CHARACTERISTICS(1)
(Commercial: 10%, +70°C; Military: 10%, -55°C +125°C)
Commercial 7207L20 Symbol tRPW tRLZ tWLZ tRHZ tWPW tRSC tRSS tRTR tRTC tRTS tRSR tEFL tHFH, tFFH tRTF tREF tRFF tRPE tWEF tWFF tWHF tRHF tWPF tXOL tXOH tXIR tXIS Parameters Shift Frequency Read Cycle Time Access Time Read Recovery Time Read Pulse Width
Military 7207L30 Min. Max. 28.5
Com'l 7207L35 Max. 22.2
Com'l Mil. 7207L50 Min. Max. Unit
7207
7207L25 Min.
Min. Max.
Max. Min.
33.3
Read Data LOW(3) Write HIGH Data Low-Z Data Valid from Read HIGH Read HIGH Data High-Z Write Cycle Time Write Pulse Width Data Set-up Time Data Hold Time Reset Cycle Time Reset Pulse Width(2) Reset Set-up Time
Write Recovery Time
Reset Recovery Time Retransmit Cycle Time Retransmit Pulse Width(2) Retransmit Set-up Time(3) Retransmit Recovery Time Reset Reset HIGH Retransmit Flags Valid Read Read HIGH HIGH Read Pulse Width after HIGH Write HIGH HIGH Write Write Flag Read HIGH Flag HIGH Write Pulse Width after HIGH Read/Write Read/Write HIGH HIGH
Pulse Width(2) Recovery Time Set-up Time
NOTES: Timings referenced Test Conditions. Pulse widths less than minimum allowed. Values guaranteed design, currently tested. Only applies read data flow-through mode.
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
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
7207
1.1K D.U.T. 30pF*
CAPACITANCE(1) +25°C, MHz)
Symbol CIN(1) COUT
(1,2)
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Parameter Input Capacitance Output Capacitance
Condition VOUT
Max.
Unit
7207
EQUIVALENT CIRCUIT
NOTES: This parameter sampled 100% tested. With output deselected.
Figure Output Load *Includes scope capacitances.
SIGNAL DESCRIPTIONS Inputs:
DATA (D0-D8) Data inputs 9-bit wide data.
Controls:
RESET (RS) Reset accomplished whenever Reset (RS) input taken state. During reset, both internal read write pointers first location. reset required after power-up before write operation take place. Both Read Enable Write Enable inputs must HIGH state during window shown Figure (i.e. tRSS before rising edge should change until tRSR after rising edge WRITE ENABLE write cycle initiated falling edge this input Full Flag (FF) set. Data set-up hold times must adhered-to, with respect rising edge Write Enable (W). Data stored array sequentially independently on-going read operation. After half memory filled, falling edge next write operation, Half-Full Flag (HF) will LOW, will remain until difference between write pointer read pointer less-than equal one-half total memory device. Half-Full Flag (HF) reset rising edge read operation. prevent data overflow, Full Flag (FF) will falling edge last write signal, which inhibits further write operations. Upon completion valid read operation, Full Flag (FF) will HIGH after tRFF, allowing valid write begin. When FIFO full, internal write pointer blocked from external changes will affect FIFO when full.
READ ENABLE read cycle initiated falling edge Read Enable (R), provided Empty Flag (EF) set. data accessed First-In/First-Out basis, independent ongoing write operations. After Read Enable goes HIGH, Data Outputs through will return high-impedance condition until next Read operation. When data been read from FIFO, Empty Flag (EF) will LOW, allowing "final" read cycle inhibiting further read operations, with data outputs remaining highimpedance state. Once valid write operation been accomplished, Empty Flag (EF) will HIGH after tWEF valid Read then begin. When FIFO empty, internal read pointer blocked from external changes will affect FIFO when empty. FIRST LOAD/RETRANSMIT (FL/RT) This dualpurpose input. Depth Expansion Mode, this grounded indicate that first device loaded (see Operating Modes). Single Device Mode initiated grounding Expansion (XI). IDT7207 made retransmit data when Retransmit Enable Control (RT) input pulsed LOW. retransmit operation will internal read pointer first location will affect write pointer. status Flags will change depending relative locations read write pointers. Read Enable Write Enable must HIGH state during retransmit. This feature useful when less than 32,768 writes performed between resets. retransmit feature compatible with Depth Expansion Mode. EXPANSION (XI) This input dual-purpose pin. Expansion (XI) grounded indicate operation single device mode. Expansion (XI) connected Expansion (XO) previous device Depth Expansion Daisy-Chain Mode.
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
Outputs:
FULL FLAG (FF) Full Flag (FF) will LOW, inhibiting further write operations, when device full. read pointer moved after Reset (RS), Full Flag (FF) will after 32,768 writes. EMPTY FLAG (EF) Empty Flag (EF) will LOW, inhibiting further read operations, when read pointer equal write pointer, indicating that device empty. EXPANSION OUT/HALF-FULL FLAG (XO/HF) This dual-purpose output. single device mode, when Expansion (XI) grounded, this output acts indication halffull memory. After half memory filled, falling edge next write operation, Half-Full Flag (HF) will
will remain until difference between write pointer read pointer less than equal half total memory device. Half-Full Flag (HF) then reset rising edge read operation. Depth Expansion Mode, Expansion (XI) connected Expansion (XO) previous device. This output acts signal next device Daisy Chain providing pulse next device when previous device reaches last location memory. There will pulse when Write pointer reaches last location memory, additional pulse when Read pointer reaches last location memory. DATA OUTPUTS (Q0-Q8) Q0-Q8 data outputs 9bit wide data. These outputs high-impedance condition whenever Read HIGH state.
NOTE: around rising edge Figure Reset
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DATA
Q0-Q8
DATA
VALID
VALID
D0-D8 DATA
VALID DATA
VALID
3140
Figure Asynchronous Write Read Operation
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
LAST WRITE
IGNORED WRITE
FIRST READ
3140
Figure Full FlagTiming From Last Write First Read
LAST READ
IGNORED READ
FIRST WRITE
DATAOUT VALID
3140
Figure Empty Flag Timing From Last Read First Write
FLAG VALID
3140
NOTE: change status during Retransmit, flags will valid tRTC. Figure Retransmit
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
3140
Figure Minimum Timing Empty Flag Coincident Read Pulse.
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Figure Minimum Timing Full Flag Coincident Write Pulse.
HALF-FULL LESS
MORE THAN HALF-FULL
HALF-FULL LESS
3140
Figure Half-Full Flag Timing
WRITE LAST PHYSICAL LOCATION READ FROM LAST PHYSICAL LOCATION
3140
Figure Expansion
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
WRITE FIRST PHYSICAL LOCATION
READ FROM FIRST PHYSICAL LOCATION
3140
Figure Expansion
OPERATING MODES:
Care must taken assure that appropriate flag monitored each system (i.e. monitored device where used; monitored device where used). additional information, refer Tech Note Operating FIFOs Full Empty Boundary Conditions Tech Note Designing with FIFOs. Single Device Mode single IDT7207 used when application requirements 32,768 words less. IDT7207 Single Device Configuration when Expansion (XI) control input grounded (see Figure 12). Depth Expansion IDT7207 easily adapted applications when requirements greater than 32,768 words. Figure demonstrates Depth Expansion using three IDT7207s. depth attained adding additional IDT7207s. IDT7207 operates Depth Expansion mode when following conditions met: first device must designated 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.
corresponding input control signals multiple devices. Status flags (EF, detected from device. Figure demonstrates 18-bit word width using IDT7207s. word width attained adding additional IDT7207s (Figure 13). Bidirectional Operation Applications which require data buffering between systems (each system capable Read Write operations) achieved pairing IDT7207s shown Figure Both Depth Expansion Width Expansion used this mode. Data Flow-Through types flow-through modes permitted, read flow-through write flow-through mode. read flowthrough mode (Figure 17), 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. 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. Compound Expansion expansion techniques described above applied together straightforward manner achieve large FIFO arrays (see Figure 15).
USAGE MODES:
Width Expansion Word width increased simply connecting
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
(HALF-FULL FLAG) WRITE DATA FULL FLAG (FF) RESET (RS)
(HF) READ 7207 DATA EMPTY FLAG (EF) RETRANSMIT (RT)
EXPANSION (XI)
3140
Figure Block Diagram 32,768 FIFO Used Single Device Mode
DATA WRITE FULL FLAG (FF) RESET (RS)
7207
7207
READ EMPTY FLAG (EF) RETRANSMIT (RT)
DATA
NOTE: Flag detection accomplished monitoring connect output signals together.
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signals either (any) device used width expansion configuration.
Figure Block Diagram 32,768 FIFO Memory Used Width Expansion Mode
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
TRUTH TABLES TABLE RESET RETRANSMIT
SINGLE DEVICE CONFIGURATION/WIDTH EXPANSION MODE
Inputs Mode Reset Retransmit Read/Write
Internal Status Read Pointer Location Zero Location Zero Increment Write Pointer Location Zero Unchanged Increment
Outputs
7207
NOTE: Pointer will Increment flag HIGH.
TABLE RESET FIRST LOAD
DEPTH EXPANSION/COMPOUND EXPANSION MODE
Inputs Mode Reset First Device Reset Other Devices Read/Write
Internal Status Read Pointer Location Zero Location Zero Write Pointer Location Zero Location Zero
Outputs
7207 NOTES: connected previous device. Figure Reset Input, FL/RT First Load/Retransmit, Empty Flag Output, Full Flag Output, Expansion Input, Half-Full Flag Output
7207
FULL
7207
EMPTY
7207
3140
Figure Block Diagram 98,304 FIFO Memory (Depth Expansion)
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
IDT7207 DEPTH EXPANSION BLOCK
IDT7207 DEPTH EXPANSION BLOCK
(N-8) (N-8) IDT7207 DEPTH EXPANSION BLOCK
NOTES: depth expansion block section Depth Expansion Figure Flag detection section Width Expansion Figure
(N-8)
(N-8)
3140
Figure Compound FIFO Expansion
7207 7201A
SYSTEM
SYSTEM
7207
3140
Figure Bidirectional FIFO Operation
DATA
DATA
DATA VALID
3140
Figure Read Data Flow-Through Mode
IDT7207 CMOS ASYNCHRONOUS FIFO 32,768
MILITARY COMMERCIAL TEMPERATURE RANGES
DATA DATA
DATA
VALID
DATA
VALID
3140
Figure Write Data Flow-Through Mode
ORDERING INFORMATION
XXXX Device Type Power Speed Package Process/ Temperature Range Blank Commercial (0°C +70°C) Military (-55°C +125°C) Compliant MIL-STD-883, Class
Plastic Ceramic Plastic Leaded Chip Carrier Leadless Chip Carrier (Military only)
Commercial Only Commercial Only Military Only Commercial Only
Access Time (tA) Speed
Power
7207
32,768 FIFO
3140

IDT7207 FEATURES: 32768 storage capacity High-speed: 20ns ac

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