k4m511533e Samsung Semiconductor, Inc., k4m511533e Datasheet - Page 11

• Manufacturer Part Number: k4m511533e
• Description: Mobile-sdram
• Manufacturer: Samsung Semiconductor, Inc.

K4M511533E - Y(P)C/L/F
Partial Array Self Refresh
1. In order to save power consumption, Mobile SDRAM has PASR option.
2. Mobile SDRAM supports 3 kinds of PASR in self refresh mode : Full Array, 1/2 of Full Array and 1/4 of Full Array.
Internal Temperature Compensated Self Refresh(Internal TCSR)
1. In order to save power consumption, Mobile-DRAM includes the internal temperature sensor and control units to control the self
2. If the EMRS for external TCSR is issued by the controller, this EMRS code for TCSR is ignored.
B. POWER UP SEQUENCE
1. Apply power and attempt to maintain CKE at a high state and all other inputs may be undefined.
2. Maintain stable power, stable clock and NOP input condition for a minimum of 200us.
3. Issue precharge commands for all banks of the devices.
4. Issue 2 or more auto-refresh commands.
5. Issue a mode register set command to initialize the mode register.
6. Issue a extended mode register set command to define DS or PASR operating type of the device after normal MRS.
EMRS cycle is not mandatory and the EMRS command needs to be issued only when DS or PASR is used.
The default state without EMRS command issued is the full driver strength and full array refreshed.
The device is now ready for the operation selected by EMRS.
For operating with DS or PASR , set DS or PASR mode in EMRS setting stage.
In order to adjust another mode in the state of DS or PASR mode, additional EMRS set is required but power up sequence is not
needed again at this time. In that case, all banks have to be in idle state prior to adjusting EMRS set.
- Apply VDD before or at the same time as VDDQ.
Temperature Range
refresh cycle automatically according to the two temperature range : Max 40 °C and Max 70 °C(for Commercial Temperature).
Max 70 °C
Max 40 °C
BA1=0
BA0=0
BA1=1
BA0=0
- Full Array
BA1=0
BA0=1
BA1=1
BA0=1
1800
- C
1500
- L
Full Array
1300
Self Refresh Current (Icc6)
BA1=0
BA0=0
BA1=1
BA0=0
850
- 1/2 Array
BA1=1
BA0=1
BA1=0
BA0=1
1/2 of Full Array
900
600
- F
1/4 of Full Array
BA1=0
BA0=0
BA1=1
BA0=0
Mobile-SDRAM
- 1/4 Array
700
500
Partial Self Refresh Area
BA1=0
BA0=1
BA1=1
BA0=1
February 2004
Unit
uA