k4s56323lf Samsung Semiconductor, Inc., k4s56323lf Datasheet - Page 11

• Manufacturer Part Number: k4s56323lf
• Description: 2m X 32bit X 4 Banks Mobile Sdram In 90fbga
• Manufacturer: Samsung Semiconductor, Inc.

K4S56323LF - F(H)E/N/S/C/L/R
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.
Temperature Compensated Self Refresh
1. In order to save power consumption, Mobile-DRAM includes the internal temperature sonsor 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 ginored.
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 PASR operating type of the device after normal MRS.
EMRS cycle is not mandatory and the EMRS command needs to be issued only when PASR is used.
The default state without EMRS command issued is all full array refreshed.
The device is now ready for the operation selected by EMRS.
For operating with PASR, set PASR mode in EMRS setting stage.
In order to adjust another mode in the state of 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.
Commercial).
Temperature Range
refresh cycle automatically according to the two temperature range : Max 40 qC and Max 85 qC(for Extended), Max 70 qC(for
Max 85/70 qC
Max 40 qC
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BA1=0
BA0=0
BA1=1
BA0=0
- Full Array
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BA1=0
BA0=1
BA1=1
BA0=1
- E/C
1500
- N/L
600
Full Array
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Self Refresh Current (Icc6)
BA1=0
BA0=0
BA1=1
BA0=0
600
450
- 1/2 Array
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11
BA1=1
BA0=1
BA1=0
BA0=1
1/2 of Full Array
- S/R
450
400
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1/4 of Full Array
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Mobile-SDRAM
- 1/4 Array
400
350
Partial Self Refresh Area
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May 2004
Unit
uA