參數(shù)資料
型號(hào): IBMN625804GT3B
廠商: IBM Microeletronics
英文描述: 256Mb Double Data Rate Synchronous DRAM(256M位雙數(shù)據(jù)速率同步動(dòng)態(tài)RAM)
中文描述: 256MB雙數(shù)據(jù)速率同步DRAM(256M位雙數(shù)據(jù)速率同步動(dòng)態(tài)RAM)的
文件頁數(shù): 59/79頁
文件大小: 1328K
代理商: IBMN625804GT3B
IBMN625404GT3B
IBMN625804GT3B
Preliminary
256Mb Double Data Rate Synchronous DRAM
29L0011.E36997B
1/01
IBM Corporation. All rights reserved.
Use is further subject to the provisions at the end of this document.
Page 59 of 79
Electrical Characteristics & AC Timing for DDR266/DDR200 - Absolute
Specifications
(0
°
C
T
A
70
°
C
;
V
DDQ
= 2.5V
±
0.2V; V
DD
= 2.5V
±
0.2V, See AC Characteristics) (Part 1 of 2)
Symbol
Parameter
DDR266A (7N)
DDR266B (75N)
DDR200 (8N)
Unit
Notes
Min
Max
Min
Max
Min
Max
t
AC
DQ output access time from CK/CK
0.75
+
0.75
0.75
+
0.75
0.8
+
0.8
ns
1, 2, 3, 4
t
DQSCK
DQS output access time from CK/CK
0.75
+
0.75
0.75
+
0.75
0.8
+
0.8
ns
1, 2, 3, 4
t
CH
CK high-level width
0.45
0.55
0.45
0.55
0.45
0.55
t
CK
1, 2, 3, 4
t
CL
CK low-level width
0.45
0.55
0.45
0.55
0.45
0.55
t
CK
1, 2, 3, 4
t
CK
Clock cycle time
CL = 2.5
7
12
7.5
12
8
12
ns
1, 2, 3, 4
t
CK
CL = 2.0
7.5
12
10
12
10
12
ns
1, 2, 3, 4
10
12
t
DH
DQ and DM input hold time
0.5
0.5
0.6
ns
1, 2, 3,
4, 18, 19
t
DS
DQ and DM input setup time
0.5
0.5
0.6
ns
1, 2, 3,
4, 18, 19
t
DIPW
DQ and DM input pulse width (each input)
1.75
1.75
2
ns
1, 2, 3, 4
t
HZ
Data-out high-impedance time from CK/CK
0.75
+
0.75
0.75
+
0.75
0.8
+
0.8
ns
1, 2, 3,
4, 5
t
LZ
Data-out low-impedance time from CK/CK
0.75
+
0.75
0.75
+
0.75
0.8
+
0.8
ns
1, 2, 3,
4, 5
t
DQSQ
DQS-DQ skew (DQS & associated DQ sig-
nals)
+
0.5
+
0.5
+
0.6
ns
1, 2, 3, 4
t
DQSQA
DQS-DQ skew (DQS & all DQ signals)
+
0.5
+
0.5
+
0.6
ns
1, 2, 3, 4
t
HP
minimum half clk period for any given
cycle; defined by clk high (t
CH
) or clk low
(t
CL
) time
t
CH
or
t
CL
t
CH
or
t
CL
t
CH
or
t
CL
t
CK
1, 2, 3, 4
t
QH
Data output hold time from DQS
t
-
0.75ns
t
-
0.75ns
t
-
1.0ns
t
CK
1, 2, 3, 4
t
DQSS
Write command to 1st DQS latching transi-
tion
0.75
1.25
0.75
1.25
0.75
1.25
t
CK
1, 2, 3, 4
t
DQSL,H
DQS input low (high) pulse width (write
cycle)
0.35
0.35
0.35
t
CK
1, 2, 3, 4
t
DSS
DQS falling edge to CK setup time (write
cycle)
0.2
0.2
0.2
t
CK
1, 2, 3, 4
t
DSH
DQS falling edge hold time from CK (write
cycle)
0.2
0.2
0.2
t
CK
1, 2, 3, 4
t
MRD
Mode register set command cycle time
14
15
16
ns
1, 2, 3, 4
t
WPRES
Write preamble setup time
0
0
0
ns
1, 2, 3,
4, 7
t
WPST
Write postamble
0.40
0.60
0.40
0.60
0.40
0.60
t
CK
1, 2, 3,
4, 6
t
WPRE
Write preamble
0.25
0.25
0.25
t
CK
1, 2, 3, 4
t
IH
Address and control input hold time (fast
slew rate)
0.9
0.9
1.1
ns
2, 3, 4,
11, 13,
14
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