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HYB18TC512160BF Datasheet, PDF (38/61 Pages) Qimonda AG – 512-Mbit Double-Data-Rate-Two SDRAM | |||
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Internet Data Sheet
HYB18TC512[16/80]0BF
512-Mbit Double-Data-Rate-Two SDRAM
3) Inputs are not recognized as valid until VREF stabilizes. During the period before VREF stabilizes, CKE = 0.2 x VDDQ is recognized as low.
4) The output timing reference voltage level is VTT.
5) tRAS.MAX is calculated from the maximum amount of time a DDR2 device can operate without a refresh command which is equal to 9 x tREFI.
Speed Grade
TABLE 41
Speed Grade Definition Speed Bins for DDR2â400B
DDR2â400B
Unit
Note
IFX Sort Name
â5
CAS-RCD-RP latencies
3â3â3
tCK
Parameter
Symbol
Min.
Max.
â
Clock Frequency
@ CL = 3
tCK
5
8
ns
1)2)3)4)
@ CL = 4
tCK
5
8
ns
1)2)3)4)
@ CL = 5
tCK
5
8
ns
1)2)3)4)
Row Active Time
tRAS
40
70000
ns
1)2)3)4)5)
Row Cycle Time
tRC
55
â
ns
1)2)3)4)
RAS-CAS-Delay
tRCD
15
â
ns
1)2)3)4)
Row Precharge Time
tRP
15
â
ns
1)2)3)4)
1) Timings are guaranteed with CK/CK differential Slew Rate of 2.0 V/ns. For DQS signals timings are guaranteed with a differential Slew
Rate of 2.0 V/ns in differential strobe mode and a Slew Rate of 1 V/ns in single ended mode. For other Slew Rates see Timings are further
guaranteed for normal OCD drive strength (EMRS(1) A1 = 0) under the âReference Load for Timing Measurementsâ according to only.
2) The CK/CK input reference level (for timing reference to CK/CK) is the point at which CK and CK cross. The DQS / DQS, RDQS / RDQS,
input reference level is the crosspoint when in differential strobe mode; The input reference level for signals other than CK/CK, DQS / DQS,
RDQS / RDQS is defined in .
3) Inputs are not recognized as valid until VREF stabilizes. During the period before VREF stabilizes, CKE = 0.2 x VDDQ is recognized as low.
4) The output timing reference voltage level is VTT. See for the reference load for timing measurements.
5) tRAS.MAX is calculated from the maximum amount of time a DDR2 device can operate without a refresh command which is equal to 9 x tREFI.
Rev. 1.11, 2006-09
38
03292006-HDLH-OAY6
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