nt1gt72u8pa1by Nanya Techology, nt1gt72u8pa1by Datasheet - Page 14

• Manufacturer Part Number: nt1gt72u8pa1by
• Description: 240pin Unbuffered Ddr2 Sdram Module With Ecc
• Manufacturer: Nanya Techology

NT512T72U89A1BY / NT1GT72U8PA1BY
512MB: 64M x 72 / 1GB: 128M x 72
Unbuffered DDR2 SDRAM DIMM with ECC
AC Timing Specifications for DDR2 SDRAM Devices Used on Module
(T
REV 1.3
08/2006
CASE
t
t
Symbol
DQSL,(H)
t
t
LZ(DQS)
DQSCK
t
t
t
t
t
t
t
LZ(DQ)
t
DQSQ
t
WPST
WPRE
t
t
DQSS
t
t
RPRE
t
t
t
t
DIPW
RPST
Delay
t
t
t
QHS
t
MRD
RRD
REFI
CCD
t
t
t
t
t
t
DSS
DSH
RFC
IPW
OIT
QH
t
t
AC
CH
HP
CK
DH
DS
HZ
= 0 °C ~ 85 ° C; V
CL
IH
IS
Minimum time clocks remains ON after CKE
asynchronously drops Low
Average Periodic Refresh Interval
(85ºC < T
Average Periodic Refresh Interval
(0ºC : T
OCD drive mode output delay
DQ output access time from CK/
DQS output access time from CK/
CK high-level width
CK low-level width
Minimum half clk period for any given cycle;
defined by clk high (t
Clock Cycle Time
DQ and DM input hold time(differential data strobe)
DQ and DM input setup time(differential data
strobe)
Input pulse width
DQ and DM input pulse width (each input)
Data-out high-impedance time from CK/
Data-out low-impedance time from CK/
DQS low-impedance time from CK/
DQS-DQ skew (DQS & associated DQ signals)
Data hold Skew Factor
Data output hold time from DQS
Write command to 1st DQS latching transition
DQS input low (high) pulse width
(write cycle)
DQS falling edge to CK setup time
(write cycle)
DQS falling edge hold time from CK
(write cycle)
Mode register set command cycle time
Write postamble
Write preamble
Address and control input hold time
Address and control input setup time
Read preamble
Read postamble
Active bank A to Active bank B command
Auto-Refresh to Active/Auto-Refresh command
period
to
CASE
CASE
DDQ
: 85ºC)
= 1.8V ± 0.1V; V
: 95º C)
Parameter
CH)
or clk low (t
DD
= 1.8V ± 0.1V, See AC Characteristics) (Part 1 of 2)
CL
) time
14
t
2t
IS +
t
0.175
0.275
NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.
-0.45
ACmin
-0.25
t
Min.
0.45
0.45
0.35
0.24
0.34
t
0.35
0.40
0.35
0.20
0.90
0.40
+ t
-0.4
105
ACmin
t
0.1
0.6
HP
QHS
0.2
0.2
7.5
t
CH
or
CL
3
2
0
2
-
-
-
IH
t
-
CK
-3C
t
t
t
+0.45
+0.25
ACmax
ACmax
ACmax
Max.
+0.4
0.55
0.55
0.60
1.10
0.60
3.9
7.8
12
8
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Unit
t
t
t
t
t
t
t
t
t
t
t
t
t
t
t
9s
9s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
CK
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