W9725G8JB Datasheet PDF - Winbond
| Part Number | W9725G8JB | |
| Description | 8M X 4 BANKS X 8 BIT DDR2 SDRAM | |
| Manufacturers | Winbond | |
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W9725G8JB
8M 4 BANKS 8 BIT DDR2 SDRAM
Table of Contents-
1. GENERAL DESCRIPTION ...................................................................................................................4
2. FEATURES ...........................................................................................................................................4
3. KEY PARAMETERS .............................................................................................................................5
4. BALL CONFIGURATION ......................................................................................................................6
5. BALL DESCRIPTION............................................................................................................................7
6. BLOCK DIAGRAM ................................................................................................................................8
7. FUNCTIONAL DESCRIPTION..............................................................................................................9
7.1 Power-up and Initialization Sequence ...................................................................................................9
7.2 Mode Register and Extended Mode Registers Operation ...................................................................10
7.2.1
Mode Register Set Command (MRS)...............................................................................10
7.2.2
Extend Mode Register Set Commands (EMRS) ..............................................................11
7.2.2.1
Extend Mode Register Set Command (1), EMR (1)................................................11
7.2.2.2
DLL Enable/Disable................................................................................................12
7.2.2.3
Extend Mode Register Set Command (2), EMR (2)................................................13
7.2.2.4
Extend Mode Register Set Command (3), EMR (3)................................................14
7.2.3
Off-Chip Driver (OCD) Impedance Adjustment ................................................................15
7.2.3.1
Extended Mode Register for OCD Impedance Adjustment ....................................16
7.2.3.2
OCD Impedance Adjust..........................................................................................16
7.2.3.3
Drive Mode .............................................................................................................17
7.2.4
On-Die Termination (ODT)...............................................................................................18
7.2.5
ODT related timings .........................................................................................................18
7.2.5.1
MRS command to ODT update delay.....................................................................18
7.3 Command Function.............................................................................................................................20
7.3.1
Bank Activate Command..................................................................................................20
7.3.2
Read Command ...............................................................................................................20
7.3.3
Write Command ...............................................................................................................21
7.3.4
Burst Read with Auto-precharge Command.....................................................................21
7.3.5
Burst Write with Auto-precharge Command.....................................................................21
7.3.6
Precharge All Command ..................................................................................................21
7.3.7
Self Refresh Entry Command ..........................................................................................21
7.3.8
Self Refresh Exit Command.............................................................................................22
7.3.9
Refresh Command ...........................................................................................................22
7.3.10
No-Operation Command ..................................................................................................23
7.3.11
Device Deselect Command..............................................................................................23
7.4 Read and Write access modes ...........................................................................................................23
7.4.1
Posted CAS ....................................................................................................................23
7.4.1.1
Examples of posted CAS operation......................................................................23
Publication Release Date: Oct. 12, 2010
- 1 - Revision A01
Datasheet pdf - http://www.DataSheet4U.net/
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W9725G8JB
3. KEY PARAMETERS
SYM.
SPEED GRADE
Bin(CL-tRCD-tRP)
Part Number Extension
@CL = 7
@CL = 6
tCK(avg) Average clock period
@CL = 5
@CL = 4
@CL = 3
tRCD
tRP
tRC
tRAS
IDD0
IDD1
IDD4R
IDD4W
IDD5B
IDD6
IDD7
Active to Read/Write Command Delay Time
Precharge to Active Command Period
Active to Ref/Active Command Period
Active to Precharge Command Period
Operating current
Operation current (Single bank)
Operating burst read current
Operating burst write current
Burst refresh current
Self refresh current (TCASE ≤ 85°C)
Operating bank interleave read current
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Max.
Min.
Min.
Min.
Min.
Max.
Max.
Max.
Max.
Max.
Max.
Max.
DDR2-1066
7-7-7
-18
1.875 nS
7.5 nS
2.5 nS
7.5 nS
3 nS
7.5 nS
3.75 nS
7.5 nS
13.125 nS
13.125 nS
53.125 nS
40 nS
70 mA
80 mA
115 mA
130 mA
85 mA
6 mA
170 mA
DDR2-800
5-5-5/6-6-6
-25/25I
2.5 nS
8 nS
2.5 nS
8 nS
3.75 nS
8 nS
5 nS
8 nS
12.5 nS
12.5 nS
52.5 nS
40 nS
65 mA
70 mA
100 mA
110 mA
80 mA
6 mA
150 mA
DDR2-667
5-5-5
-3
3 nS
8 nS
3.75 nS
8 nS
5 nS
8 nS
15 nS
15 nS
55 nS
40 nS
60 mA
65 mA
90 mA
95 mA
80 mA
6 mA
140mA
-5-
Publication Release Date: Oct. 12, 2010
Revision A01
Datasheet pdf - http://www.DataSheet4U.net/
Preview 5 Page |
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| Information | Total 30 Pages | |
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