Internet Data Sheet
Rev. 1.41, 2006-11
03062006-0GN5-WTPW
30
HYS[64/72]T[16/32/64]0xxHU–[2.5/../5]–A
Unbuffered DDR2 SDRAM Modules
DQS falling edge hold time from CK (write
cycle)
DQS falling edge to CK setup time (write cycle)
t
DSS
Clock half period
Data-out high-impedance time from CK / CK
Address and control input hold time
Address and control input pulse width
(each input)
Address and control input setup time
DQ low-impedance time from CK / CK
DQS low-impedance from CK / CK
Mode register set command cycle time
OCD drive mode output delay
Data output hold time from DQS
Data hold skew factor
Average periodic refresh Interval
t
DSH
0.2
—
t
CK
0.2
MIN. (
t
CL,
t
CH
)
—
475
0.6
—
t
CK
t
HP
t
HZ
t
IH
(base)
t
IPW
12)
t
AC.MAX
—
—
ps
ps
t
CK
13)
11)
t
IS
(base)
t
LZ(DQ)
t
LZ(DQS)
t
MRD
t
OIT
t
QH
t
QHS
t
REFI
350
2
×
t
AC.MIN
t
AC.MIN
2
0
t
HP
–
t
QHS
—
—
—
75
—
t
AC.MAX
t
AC.MAX
—
12
—
450
7.8
3.9
—
ps
ps
ps
t
CK
ns
11)
14)
14)
ps
μ
s
μ
s
ns
14)15)
16)18)
Auto-Refresh to Active/Auto-Refresh
command period
Precharge-All (4 banks) command period
Precharge-All (8 banks) command period
Read preamble
Read postamble
Active bank A to Active bank B command
period
t
RFC
17)
t
RP
t
RP
t
RPRE
t
RPST
t
RRD
t
RP
+ 1
t
CK
15 + 1
t
CK
0.9
0.40
7.5
10
7.5
0.25
0.40
15
—
—
1.1
0.60
—
—
—
—
0.60
—
ns
ns
t
CK
t
CK
ns
ns
ns
t
CK
t
CK
ns
14)
14)
14)18)
16)20)
Internal Read to Precharge command delay
Write preamble
Write postamble
Write recovery time for write without Auto-
Precharge
Write recovery time for write with Auto-
Precharge
Internal Write to Read command delay
Exit power down to any valid command
(other than NOP or Deselect)
Exit active power-down mode to Read
command (slow exit, lower power)
Exit precharge power-down to any valid
command (other than NOP or Deselect)
Exit Self-Refresh to non-Read command
Exit Self-Refresh to Read command
t
RTP
t
WPRE
t
WPST
t
WR
19)
WR
t
WR
/
t
CK
—
t
CK
20)
t
WTR
t
XARD
10
2
—
—
ns
t
CK
21)
22)
t
XARDS
6 – AL
—
t
CK
22)
t
XP
2
—
t
CK
t
XSNR
t
XSRD
t
RFC
+10
200
—
—
ns
t
CK
Parameter
Symbol
DDR2–400
Unit
Note
1)2)3)4)5)
6)7)
Min.
Max.