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EDD2504AKTA-E Datasheet(PDF) 7 Page - Elpida Memory

Part No. EDD2504AKTA-E
Description  256M bits DDR SDRAM (64M words x 4 bits)
Download  49 Pages
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Manufacturer  ELPIDA [Elpida Memory]
Direct Link  http://www.elpida.com/en
Logo ELPIDA - Elpida Memory

EDD2504AKTA-E Datasheet(HTML) 7 Page - Elpida Memory

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EDD2504AKTA-E
Data Sheet E0610E10 (Ver. 1.0)
7
-6B
-7A
-7B
Parameter
Symbol
min.
max.
min.
max.
min.
max.
Unit
Notes
Address and control input setup
time
tIS
0.75
0.9
0.9
ns
8
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
67.5
67.5
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.


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