72SD3232BRPFK Просмотр технического описания (PDF) - MAXWELL TECHNOLOGIES
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72SD3232BRPFK Datasheet PDF : 41 Pages
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1 Gbit(8-Meg X 32-Bit X 4-Banks) SDRAM
72SD3232B
TABLE 5. AC Electrical Characteristics
(VDD =3.3V + 0.3V, VDDQ = 3.3V + 0.3V, TA = -55 TO 125°C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
SUBGROUPS
MIN
TYP
MAX
UNIT
System clock cycle time1
tCK
9, 10, 11
ns
(CAS latency = 2)
10
(CAS latency = 3)
7.5
CLK high pulse width1,7
CLK low pulse width1,7
Access time from CLK1,2
(CAS latency = 2)
(CAS latency = 3)
tCKH
9, 10, 11 2.5
tCKL
9, 10, 11 2.5
tAC
9, 10, 11
ns
ns
ns
6
6
Data-out hold time1,2
CLK to Data-out low impedance1,2,3,7
CLK to Data-out high impedance1,4,7
(CAS latency = 2, 3)
tOH
9, 10, 11 2.7
tLZ
9, 10, 11
2
tHZ
9, 10, 11
ns
ns
5.4
ns
Input setup time 1,5,6
CKE setup time for power down exit1
Input hold time1,6
Ref/Active to Ref/Active command period1
Active to Precharge command period1
Active command to column command
(same bank)1
tAS, tCS,
9, 10, 11
1.5
tDS, tCES
tCESP
9, 10, 11 1.5
tAH, tCH, tDH 9, 10, 11
1.5
tCEH
tRC
9, 10, 11
70
tRAS
9, 10, 11
50
tRCD
9, 10, 11
20
ns
ns
ns
ns
120000
ns
ns
Precharge to Active command period1
tRP
9, 10, 11
20
ns
Write recovery or data-in to precharge
tDPL
9, 10, 11
20
ns
lead time1
Active( a) to Active (b) command period
Transition time(rise and fall)7
Refresh Period
tRRD
9, 10, 11
20
ns
tT
9, 10, 11
1
5
ns
tREF
9, 10, 11
16
6.4
ms
105° C
32
168
85° C
64
70° C
128
1. AC measurement assumes tT=1ns. Reference level for timing of input signals is 1.5V
2. Access time is measured at 1.5V.
3. tLZ(min) defines the time at which the outputs achieve the low impedance state.
4. tHZ(min) defines the time at which the outputs achieve the high impedance state.
5. tCES defines CKE setup time to CLK rising edge except for the power down exit command.
6. tAS/tAH: Address, tC/tCH: /CS, /RAS, /CAS, /WE, DQM
7. Guarenteed by design. (Not Tested)
8. Guarenteed by Device Characterization. ( Not 100% Tested)
06.11.08 Rev 1
All data sheets are subject to change without notice 5
©2008 Maxwell Technologies
All rights reserved.
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