Transcend 1GB, 64Mx8, CL5, DIMM 240pin, DDR2, 667, ECC Unbuffered JM388Q643A-6 User Manual
Product codes
JM388Q643A-6
J
J
J
M
M
M
3
3
3
8
8
8
8
8
8
Q
Q
Q
6
6
6
4
4
4
3
3
3
A
A
A
-
-
-
6
6
6
240PIN DDR2 667 Unbuffered DIMM
1GB With 64Mx8 CL5
Transcend Information Inc.
11
36
Write recovery time(=tWR)
15ns 3C
37
Internal write to read command delay(=tWTR)
7.5ns 1E
38
Internal read to precharge command delay(=tRTP)
7.5ns 1E
39
Memory analysis probe characteristics
- 00
40
Reserved
- 00
41
DDR SDRAM Minimum Active to Active/Auto Refresh
Time(tRC)
Time(tRC)
60ns 3C
42
DDR SDRAM Minimum Auto-Refresh to
Active/Auto-Refresh Command Period (tRFC)
Active/Auto-Refresh Command Period (tRFC)
105ns 69
43
DDR SDRAM Maximum Device Cycle Time (tCK max)
8ns 80
44
DDR SDRAM DQS-DQ Skew for DQS and associated
DQ signals (tDQSQ max)
DQ signals (tDQSQ max)
0.24ns 18
45
DDR SDRAM Read Data Hold Skew Factor (tQHS)
0.34ns 22
46
PLL Relock Time
- 00
47~61
Superset Information
- 00
62
SPD Data Revision Code
REV 1.2
12
63
Checksum for Bytes 0-62
76
76
64-71
Manufacturers JEDEC ID
Transcend
7F, 4F
72 Manufacturing
Location
T
54
4A 4D 33
38
38
51
36 34 33
41 2D 36
73-90 Manufacturers Part Number
JM388Q643A-6
20 20 20
20
20
20
91-92 Revision
Code
-
-
93-94
Manufacturing Date
By Manufacturer
Variable
95-98
Assembly Serial Number
By Manufacturer
Variable
99-127 Manufacturer
Specific
Data
-
-
128~255 Open for customer use
Undefined -