HYB18L256160B Datasheet, PDF (42/58 Pages) Qimonda AG – DRAMs for Mobile Applications 256-Mbit Mobile-RAM

Data Sheet
HY[B/E]18L256160B[C/F]L-7.5
256-Mbit Mobile-RAM
FIGURE 44
Self Refresh Entry and Exit
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Parameter
TABLE 15
Timing Parameters for AUTO REFRESH and SELF REFRESH
Symbol
- 7.5
Units
Note
min.
max.
ACTIVE to ACTIVE command period t_RC
67
—
ns
1)
PRECHARGE command period
t_RP
19
—
ns
1)
Refresh period (8192 rows)
t_REF
—
64
ms
1)
Self refresh exit time
t_SREX
1
—
t_CK
1)
1) These parameters account for the number of clock cycles and depend on the operating frequency as follows:
no. of clock cycles = specified delay / clock period; round up to next integer.
Rev. 1.73, 2006-09
42
01302004-CZ2R-J9SE