97SD3240 Datasheet, PDF (5/39 Pages) Maxwell Technologies – 1.25Gb SDRAM 8-Meg X 40-Bit X 4-Banks

1.25Gb (8-Meg X 40-Bit X 4-Banks) SDRAM
97SD3240
TABLE 5. AC Electrical Characteristics
(V_CC =3.3V + 0.3V, V_CCQ = 3.3V + 0.3V, T_A = -55 TO 125°C, UNLESS OTHERWISE SPECIFIED)
PARAMETER
SYMBOL
SUBGROUPS
MIN
TYPICAL
MAX
UNIT
System clock cycle time¹
t_CK
9, 10, 11
ns
(CAS latency = 2)
10
(CAS latency = 3)
7.5
CLK high pulse width^1,7
CLK low pulse width^1,7,
Access time from CLK^1,2
(CAS latency = 2)
(CAS latency = 3)
t_CKH
9, 10, 11 2.5
t_CKL
9, 10, 11 2.5
t_AC
9, 10, 11
ns
ns
ns
6
6
Data-out hold time^1,2,3
CLK to Data-out low impedance^1,2,3,7
CLK to Data-out high impedance^1,47,
(CAS latency = 2, 3)
t_OH
9, 10, 11 2.7
t_LZ
9, 10, 11
2
t_HZ
9, 10, 11
ns
ns
5.4
ns
Input setup time^1,5,6
CKE setup time for power down exit¹
Input hold time^1,6
Ref/Active to Ref/Active command period¹
Active to Precharge command period¹
Active command to column command ¹
(same bank)
t_AS, t_CS,
9, 10, 11
1.5
t_DS, t_CES
t_CESP
9, 10, 11 1.5
t_AH, t_CH, t_DH 9, 10, 11
1.5
t_CEH
t_RC
9, 10, 11
70
t_RAS
9, 10, 11
50
t_RCD
9, 10, 11
20
Precharge to Active command period¹
t_RP
9, 10, 11
20
Write recovery or data-in to precharge lead time¹
t_DPL
9, 10, 11
20
Active( a) to Active (b) command period¹
t_RRD
9, 10, 11
20
Transition time(rise and fall)⁷
t_T
9, 10, 11
1
Refresh Period
t_REF
9, 10, 11
@ 105 °C
ns
ns
ns
ns
120000
ns
ns
ns
ns
ns
5
ns
16
6.4
ms
32
16⁸
@ 85 °C
64
@ 70 °C
128
1. AC measurement assumes t_T=1ns. Reference level for timing of input signals is 1.5V.
2. Access time is measured at 1.5V.
3. t_LZ(min) definesthe time at which the outputs achieve the low impedance state.
4. t_HZ(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. t_AS/t_AH: Address, t_CS/t_CH: /RAS, /CAS, /WE, DQM
7. Guarenteed by design (Not tested).
8. Guarenteed by Device Charactreization Testing. (Not 100% Tested)
02.04.05 Rev 3
All data sheets are subject to change without notice 5
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