NT256D72S89AKGU-7K データシートの表示（PDF） - Unspecified
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NT256D72S89AKGU-7K Datasheet PDF : 15 Pages
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NT256D72S89AKGU
256MB : 32M x 72
Low Profile Registered DDR SDRAM DIMM
AC Timing Specifications for DDR SDRAM Devices Used on Module
(TA = 0 °C ~ 70 °C; VDDQ = 2.5V ± 0.2V; VDD = 2.5V ± 0.2V, See AC Characteristics) (Part 1 of 2)
Symbol
Parameter
-7K
Min.
Max.
-75B
Min.
Max.
-8B
Min.
Max.
tAC
DQ output access time from CK/CK
-0.75
+0.75
-0.75
+0.75
-0.8
+0.8
tDQSCK DQS output access time from CK/CK
-0.75
+0.75
-0.75
+0.75
-0.8
+0.8
tCH
CK high-level width
0.45
0.55
0.45
0.55
0.45
0.55
tCL
CK low-level width
0.45
0.55
0.45
0.55
0.45
0.55
tCK
Clock cycle time
tCK
CL=2.5
7
12
7.5
12
8
12
CL=2
7.5
12
10
12
10
12
tDH
DQ and DM input hold time
0.5
0.5
0.6
tDS
DQ and DM input setup time
tDIPW
tHZ
DQ and DM input pulse width (each
input)
Data-out high-impedance time from
CK/CK
tLZ
tDQSQ
tDQSQA
tHP
Data-out low-impedance time from
CK/CK
DQS-DQ skew (DQS & associated
DQ signals)
DQS-DQ skew (DQS & all DQ
signals)
Minimum half clk period for any given
cycle; defined by clk high (tCH )
or clk low (tCL ) time
tQH
Data output hold time from DQS
tDQSS
tDQSL,H
tDSS
tDSH
tMRD
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
tWPRES Write preamble setup time
tWPST
tWPRE
tIH
Write postamble
Write preamble
Address and control input hold time
(fast slew rate)
0.5
1.75
-0.75
-0.75
tCH
or
tCL
tHP -
0.75ns
0.75
0.35
0.2
0.2
14
0
0.40
0.25
0.9
+0.75
+0.75
0.5
0.5
1.25
0.60
0.5
1.75
-0.75
-0.75
tCH
or
tCL
tHP -
0.75ns
0.75
0.35
0.2
0.2
15
0
0.40
0.25
1.1
+0.75
+0.75
0.5
0.5
1.25
0.60
Address and control input setup time
tIS
0.9
1.1
(fast slew rate)
Address and control input hold time
tIH
1.0
1.1
(slow slew rate)
0.6
2
-0.8
-0.8
tCH
or
tCL
tHP -
1.0ns
0.75
0.35
0.2
0.2
16
0
0.40
0.25
1.1
1.1
1.1
+0.8
+0.8
0.6
0.6
1.25
0.60
Unit Notes
ns
1-4
ns
1-4
tCK
1-4
tCK
1-4
ns
1-4
ns
1-4
1-4,
ns
15, 16
1-4,
ns
15, 16
ns
1-4
ns 1-4, 5
ns 1-4, 5
ns
1-4
ns
1-4
tCK
1-4
tCK
1-4
tCK
1-4
tCK
1-4
tCK
1-4
tCK
1-4
ns
1-4
ns 1-4, 7
tCK 1-4, 6
tCK
1-4
2-4,
ns 9, 11,
12
2-4,
ns 9, 11,
12
2-4,
ns 10-12,
14
REV 0.2 (Preliminary)
09/2002
11
© NANYA TECHNOLOGY CORP.
NANYA TECHNOLOGY CORP. reserves the right to change Products and Specifications without notice.
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