HY[B/E]18L128160B[C/F]-7.5
128-Mbit Mobile-RAM
Functional DescriptionCommands
Table 14
Timing Parameters for AUTO REFRESH and SELF REFRESH
Parameter
Symbol
- 7.5
Units
ns
Notes
min.
max.
1)
ACTIVE to ACTIVE command period
PRECHARGE command period
Refresh period (4096 rows)
Self refresh exit time
tRC
67
19
–
–
–
tRP
ns
tREF
tSREX
64
ms
tCK
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.
2.4.10
POWER DOWN
#,+
#+%
#3
2!3
#!3
7%
!ꢄꢀ!ꢅꢅ
"!ꢄꢉ"!ꢅ
ꢃ $ONgT #ARE
Figure 45 Power Down Entry Command
Power-down is entered when CKE is registered LOW (no accesses can be in progress). If power-down occurs
when all banks are idle, this mode is referred to as precharge power-down; if power-down occurs when there is a
row active in any bank, this mode is referred to as active power-down. Entering power-down deactivates the input
and output buffers, excluding CLK and CKE. CKE LOW must be maintained during power-down.
Power-down duration is limited by the refresh requirements of the device (tREF).
The power-down state is synchronously exited when CKE is registered HIGH (along with a NOP or DESELECT
command). One clock delay is required for power down entry and exit.
Data Sheet
40
Rev. 1.71, 2007-01
05282004-NZNK-8T0D
QIMONDA [ QIMONDA AG ]
