EDD10321BBH-5BTS-F datasheet(9/58 Pages) ELPIDA

Part #	EDD10321BBH-5BTS-F

Description	1G bits DDR Mobile RAM??WTR (Wide Temperature Range)

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Manufacturer	ELPIDA [Elpida Memory]

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EDD10321BBH-TS

Preliminary Data Sheet E1403E30 (Ver. 3.0)

9

-5B

-6E

Parameter

Symbol

min.

max.

min.

max.

Unit

Notes

Autoprecharge write recovery and

precharge time

tDAL

—

9

Self-refresh exit period

tSREX

120

—

120

—

ns

Internal Write to Read command delay

tWTR

2

—

1

—

tCK

Average periodic refresh interval

tREF

—

7.8

—

7.8

µs

Notes: 1. On all AC measurements, we assume the test conditions shown in “Test conditions” and full driver

strength is assumed for the output load, that is both A6 and A5 of EMRS is set to be “L”.

2. This parameter defines the signal transition delay from the cross point of CK and /CK. The signal

transition is defined to occur when the signal level crossing VDDQ/2.

3. The timing reference level is VDDQ/2.

4. Output valid window is defined to be the period between two successive transition of data out signals.

The signal transition is defined to occur when the signal level crossing VDDQ/2.

5. tHZ is defined as DOUT transition delay from low-Z to high-Z at the end of read burst operation. The

timing reference is cross point of CK and /CK. This parameter is not referred to a specific DOUT voltage

level, but specify when the device output stops driving.

6. tLZ is defined as DOUT transition delay from high-Z to low-Z at the beginning of read operation. This

parameter is not referred to a specific DOUT voltage level, but specify when the device output begins

driving.

7. The transition from low-Z to high-Z is defined to occur when the device output stops driving. A specific

reference voltage to judge this transition is not given.

8. tAC, tDQSCK, tHZ and tLZ are specified with 15pF bus loading conditio

n.

9

. Minimum 3 clocks of tDAL (= tWR + tRP) is required because it need minimum 2 clocks for tWR and

minimum 1 clock for tRP.

tDAL = (tWR/tCK) + (tRP/tCK): for each of the terms above, if not already an integer, round to the next

higher integer.

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