EDD2508AMTA, EDD2516AMTA

Preliminary Data Sheet E0405E10 (Ver. 1.0)

8

-6B

-7A

-7B

Parameter

Symbol

min.

max.

min.

max.

min.

max

Unit

Notes

Address and control input hold time

tIH

0.75

—

0.9

—

0.9

—

ns

8

Address and control input pulse width tIPW

2.2

—

2.2

—

2.2

—

ns

7

Mode register set command cycle

time

tMRD

2

—

2

—

2

—

tCK

Active to Precharge command period tRAS

42

120000

45

120000

45

120000

ns

Active to Active/Auto refresh

command period

tRC

60

—

65

—

65

—

ns

Auto refresh to Active/Auto refresh

command period

tRFC

72

—

75

—

75

—

ns

Active to Read/Write delay

tRCD

18

—

20

—

20

—

ns

Precharge to active command period tRP

18

—

20

—

20

—

ns

Active to Autoprecharge delay

tRAP

tRCD min. —

tRCD min. —

tRCD min. —

ns

Active to active command period

tRRD

12

—

15

—

15

—

ns

Write recovery time

tWR

15

—

15

—

15

—

ns

Auto precharge write recovery and

precharge time

tDAL

(tWR/tCK)+

(tRP/tCK)

—

(tWR/tCK)+

(tRP/tCK)

—

(tWR/tCK)+

(tRP/tCK)

—

tCK

13

Internal write to Read command

delay

tWTR

1

—

1

—

1

—

tCK

Average periodic refresh interval

tREF

—

7.8

—

7.8

—

7.8

µs

Notes: 1. On all AC measurements, we assume the test conditions shown in the next page. For timing parameter

definitions, see ‘Timing Waveforms’ section.

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 VTT.

3. The timing reference level is VTT.

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

(read) signals. The signal transition is defined to occur when the signal level crossing VTT.

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. Input valid windows is defined to be the period between two successive transition of data input or DQS

(write) signals. The signal transition is defined to occur when the signal level crossing VREF.

8. The timing reference level is VREF.

9. 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.

10. tCK (max.) is determined by the lock range of the DLL. Beyond this lock range, the DLL operation is not

assured.

11. tCK = tCK (min) when these parameters are measured. Otherwise, absolute minimum values of these

values are 10% of tCK.

12. VDD is assumed to be 2.5V ± 0.2V. VDD power supply variation per cycle expected to be less than

0.4V/400 cycle.

13. tDAL = (tWR/tCK)+(tRP/tCK)

For each of the terms above, if not already an integer, round to the next highest integer.

Example: For –7A Speed at CL = 2.5, tCK = 7.5ns, tWR = 15ns and tRP= 20ns,

tDAL = (15ns/7.5ns) + (20ns/7.5ns) = (2) + (3)

tDAL = 5 clocks