EDE2104ABSE Datasheet, PDF (14/81 Pages) Elpida Memory – 2G bits DDR2 SDRAM

EDE2104ABSE, EDE2108ABSE
AC Characteristics (TC = 0°C to +85°C, VDD, VDDQ = 1.8V ± 0.1V, VSS, VSSQ = 0V) [DDR2-800, 667]
• New units tCK(avg) and nCK, are introduced in DDR2-800 and DDR2-667
tCK(avg): actual tCK(avg) of the input clock under operation.
nCK: one clock cycle of the input clock, counting the actual clock edges.
-8G
-6E
Speed bin
DDR2-800 (6-6-6)
DDR2-667 (5-5-5)
Parameter
Symbol
Active to read or write command
delay
tRCD
Precharge command period
tRP
Active to active/auto-refresh
command time
tRC
DQ output access time from CK, /CK tAC
DQS output access time from CK,
/CK
tDQSCK
min.
15
15
60
−400
−350
CK high-level width
tCH (avg) 0.48
CK low-level width
CK half period
Clock cycle time
(CL = 6)
(CL = 5)
tCL(avg) 0.48
tHP
Min. (tCL(abs),
tCH(abs))
tCK (avg) 2500
tCK (avg) 3000
max.



+400
+350
0.52
0.52

8000
8000
min.
15
15
60
−450
−400
max.



+450
+400
0.48
0.52
0.48
Min.(tCL(abs),
tCH(abs))
3000
3000
0.52

8000
8000
Unit Notes
ns
ns
ns
ps 10
ps 10
tCK
(avg)
13
tCK
(avg)
13
ps 6, 13
ps 13
ps 13
(CL = 4)
tCK (avg) 3750
8000
3750
8000
ps 13
(CL = 3)
tCK (avg) 5000
8000
5000
8000
ps 13
DQ and DM input hold time
tDH (base) 125
DQ and DM input setup time
tDS (base) 50
Control and Address input pulse
width for each input
tIPW
DQ and DM input pulse width for
each input
tDIPW
Data-out high-impedance time from
CK,/CK
tHZ
DQS, /DQS
CK,/CK
low-impedance
time
from
tLZ
(DQS)
0.6
0.35

tAC min.
DQ low-impedance time from CK,/CK tLZ (DQ) 2 × tAC min.
DQS-DQ skew for DQS and
associated DQ signals
tDQSQ 
DQ hold skew factor
tQHS

DQ/DQS output hold time from DQS tQH
tHP – tQHS
DQS latching rising transitions to
associated clock edges
tDQSS
−0.25
DQS input high pulse width
tDQSH 0.35
DQS input low pulse width
tDQSL
0.35
DQS falling edge to CK setup time tDSS
0.2
DQS falling edge hold time from CK tDSH
0.2
Mode register set command cycle
time
tMRD
2
Write postamble
tWPST 0.4

175

100

0.6

0.35
tAC max. 
tAC max. tAC min.
tAC max. 2 × tAC min.
200

300


tHP – tQHS
+0.25
−0.25

0.35

0.35

0.2

0.2

2
0.6
0.4

ps 5

ps 4

tCK
(avg)

tCK
(avg)
tAC max. ps 10
tAC max. ps 10
tAC max. ps 10
240
ps
340

+0.25




ps 7
ps 8
tCK
(avg)
tCK
(avg)
tCK
(avg)
tCK
(avg)
tCK
(avg)

nCK
0.6
tCK
(avg)
Data Sheet E1196E30 (Ver. 3.0)
14