W9425G6EH-5 Winbond Electronics, W9425G6EH-5 Datasheet - Page 38
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W9425G6EH-5
Manufacturer Part Number
W9425G6EH-5
Description
IC DDR-400 SDRAM 256MB 66TSSOPII
Manufacturer
Winbond Electronics
Datasheet
1.W9425G6EH-5.pdf
(54 pages)
Specifications of W9425G6EH-5
Format - Memory
RAM
Memory Type
DDR SDRAM
Memory Size
256M (16Mx16)
Speed
250MHz
Interface
Parallel
Voltage - Supply
2.3 V ~ 2.7 V
Operating Temperature
0°C ~ 70°C
Package / Case
66-TSOPII
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
W9425G6EH-5
Manufacturer:
WINBOND
Quantity:
1 728
Part Number:
W9425G6EH-5
Manufacturer:
WINBOND/华邦
Quantity:
20 000
11.4 Write Timing (Burst Length = 4)
Note: x16 has two DQSs (UDQS for upper byte and LDQS for lower byte). Even if one of the 2 bytes is not used, both UDQS
DQ8~15
DQ0~7
(Data)
UDQS
LDQS
and LDQS must be toggled.
Input
x4, x8 device
DQS
CLK
x16 device
CMD
ADD
CLK
t
t
IS
IS
WRIT
Col
t
t
t
IH
IH
WPRES
t
t
t
CH
WPRES
WPRES
t
t
Preamble
Preamble
Preamble
DQSS
DQSS
t
WPRE
t
DQSS
t
t
t
CL
WPRE
WPRE
t
DS
DA0
DA0
t
t
t
DS
DS
DA0
DA0
DA0
DA0
DH
t
DQSH
t
t
DH
DH
t
DSH
tDSH
t
t
t
DQSH
DSH
DQSH
DA1
DA1
DA1
DA1
DA1
DA1
t
CK
t
DQSL
t
DSS
t
t
t
t
DQSL
DQSL
DSS
DSS
t
DS
DA2
DA2
t
t
t
DS
DS
DA2
DA2
DA2
DA2
DH
t
DQSH
- 38 -
t
t
DH
DH
t
DSH
t
t
t
DQSH
DQSH
t
DSH
DSH
t
DS
DA3
DA3
t
t
t
DS
DS
DA3
DA3
DA3
DA3
Postamble
DH
t
WPST
t
t
Postamble
DH
Postamble
DH
t
DSS
t
t
WPST
WPST
t
t
DSS
DSS
Publication Release Date:Dec. 03, 2008
W9425G6EH
Revision A08