EBE51UD8AGWA
AC Characteristics (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V, VSS, VSSQ = 0V) [DDR2 667]
(DDR2 SDRAM Component Specification)
-6E
667
min.
5
Frequency (Mbps)
Parameter
Symbol
CL
max.
5
Unit
tCK
ns
Notes
/CAS latency
Active to read or write command delay
Precharge command period
Active to active/auto refresh command time
DQ output access time from CK, /CK
DQS output access time from CK, /CK
CK high-level width
tRCD
tRP
15
15
ns
tRC
60
ns
tAC
−450
−400
0.45
0.45
+450
+400
0.55
0.55
ps
tDQSCK
tCH
ps
tCK
tCK
CK low-level width
tCL
min.
(tCL, tCH)
CK half period
tHP
ps
Clock cycle time
tCK
3000
175
100
0.6
8000
ps
DQ and DM input hold time
DQ and DM input setup time
tDH (base)
tDS (base)
ps
5
4
ps
Control and Address input pulse width for each input tIPW
tCK
tCK
ps
DQ and DM input pulse width for each input
Data-out high-impedance time from CK,/CK
Data-out low-impedance time from CK,/CK
DQS-DQ skew for DQS and associated DQ signals
DQ hold skew factor
tDIPW
tHZ
0.35
tAC max.
tAC max.
240
tLZ
tAC min.
ps
tDQSQ
tQHS
tQH
ps
340
ps
DQ/DQS output hold time from DQS
tHP – tQHS
ps
DQS latching rising transitions to associated clock
edges
tDQSS
−0.25
+0.25
tCK
DQS input high pulse width
DQS input low pulse width
DQS falling edge to CK setup time
DQS falling edge hold time from CK
Mode register set command cycle time
Write postamble
tDQSH
tDQSL
tDSS
0.35
0.35
0.2
tCK
tCK
tCK
tCK
tCK
tCK
tCK
ps
tDSH
0.2
tMRD
2
tWPST
tWPRE
tIH (base)
tIS (base)
tRPRE
tRPST
tRAS
0.4
0.6
Write preamble
0.35
275
200
0.9
Address and control input hold time
Address and control input setup time
Read preamble
5
4
ps
1.1
tCK
tCK
ns
Read postamble
0.4
0.6
Active to precharge command
Active to auto-precharge delay
Active bank A to active bank B command period
Write recovery time
45
70000
tRAP
tRCD min.
7.5
ns
tRRD
ns
tWR
15
ns
(tWR/tCK)+
(tRP/tCK)
Auto precharge write recovery + precharge time
tDAL
tCK
1
Internal write to read command delay
tWTR
tRTP
7.5
ns
ns
Internal read to precharge command delay
7.5
Preliminary Data Sheet E0921E10 (Ver. 1.0)
16
ELPIDA [ ELPIDA MEMORY ]
