HYB18L256169BF QIMONDA [Qimonda AG], HYB18L256169BF Datasheet - Page 35

• Manufacturer Part Number: HYB18L256169BF
• Description: 256-Mbit Mobile-RAM
• Manufacturer: QIMONDA [Qimonda AG]

2.4.9.2
Figure 43
Figure 44
Table 13
Parameter
ACTIVE to ACTIVE command period
PRECHARGE command period
Refresh period (8192 rows)
Self refresh exit time
1) These parameters account for the number of clock cycles and depend on the operating frequency as follows:
Data Sheet
no. of clock cycles = specified delay / clock period; round up to next integer.
SELF REFRESH
SELF REFRESH Entry Command
Self Refresh Entry and Exit
Timing Parameters for AUTO REFRESH and SELF REFRESH
Symbol
t
t
SREX
t
t
REF
35
RC
RP
The SELF REFRESH command can be used to retain
data in the Mobile-RAM, even if the rest of the system
is powered down. When in the self refresh mode, the
Mobile-RAM retains data without external clocking. The
SELF REFRESH command is initiated like an AUTO
REFRESH command except CKE is LOW. Input
signals except CKE are “Don’t Care” during SELF
REFRESH.
The procedure for exiting SELF REFRESH requires a
stable clock prior to CKE returning HIGH. Once CKE is
HIGH, NOP commands must be issued for
time is required for a completion of any internal refresh
in progress.
If during normal operation burst auto refresh or user
controlled refresh is used, add 8192 auto refresh cycles
just before self refresh entry and just after self refresh
exit.
min.
67
19
–
1
- 7.5
HY[B/E]18L256169BF-7.5
max.
64
–
–
–
256-Mbit Mobile-RAM
Functional Description
02032006-MP0M-7FQG
Rev. 1.02, 2006-12
Units
ms
t
ns
ns
CK
t
RC
because
Notes
1)
1)
1)
1)