EMLS232TA Datasheet, PDF (13/14 Pages) Emerging Memory & Logic Solutions Inc – 512K x 32 x 4Banks Low Power SDRAM Specificaton

EMLS232TA Series
512K x 32 x 4Banks Low Power SDRAM
Partial Array Self Refresh
1. In order to save power consumption, Low Power SDRAM has PASR option.
2. Low Power SDRAM supports 3 kinds of PASR in self refresh mode : Full Array, 1/2 of Full Array and 1/4 of Full Array
BA1=0 BA1=0
BA0=0 BA0=1
BA1=1 BA1=1
BA0=0 BA0=1
- Full Array
BA1=0 BA1=0
BA0=0 BA0=1
BA1=1 BA1=1
BA0=0 BA0=1
- 1/2 Array
BA1=0 BA1=0
BA0=0 BA0=1
BA1=1 BA1=1
BA0=0 BA0=1
- 1/4 Array
Partial Self Refresh Area
Internal Temperature Compensated Self Refresh (TCSR)
NOTE :
1. In order to save power consumption,Low power SDRAM includes the internal temperature sensor and control units to control the
self refresh cycle automatically according to the two temperature range : Max 85 , Max 70 , Max 45 , Max 15
2. If the EMRS for exteranl TCSR is issued by the controller, this EMRS code for TC^ RS is igno^red.


3. It has +/- 5 tolerance.

Temperature Range
Max 85
Â¥
Max 70
Â¥
Max. 45 3
Â¥
Max 15
Â¥
Full Array
250
TBD
TBD
TBD
Self Refresh Current (Icc6)
1/2 of Full Array
1/4 of Full Array
190
150
TBD
TBD
TBD
TBD
TBD
TBD
Unit

B. POWER UP SEQUENCE
1. Apply power and attempt to maintain CKE at a high state and all other inputs may be undefined.
-Apply V_DD before or at the same time as V_DDQ.
2. Maintain stable power, stable clock and NOP input condition for a mininmun of 200 .
&
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 half 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.
Rev 0.3