w942508bh Winbond Electronics Corp America, w942508bh Datasheet - Page 10

• Manufacturer Part Number: w942508bh
• Manufacturer: Winbond Electronics Corp America

12. AC CHARACTERISTICS AND OPERATING CONDITION
(Notes: 10, 12)
t
t
SYM.
t
t
t
WPRES
t
t
DQSCK
t
t
t
t
t
t
t
t
WPRE
t
t
t
t
DQSQ
DQSH
t
WPST
t
t
t
t
t
RPRE
DQSL
t
DQSS
DSSK
t
XSNR
XSRD
t
t
RPST
DIPW
T(SS)
WTR
t
RCD
CCD
t
RRD
t
t
t
t
t
t
t
MRD
RFC
RAS
RAP
t
DSS
DSH
t
REF
DAL
t
IPW
t
WR
t
RC
CH
QH
DH
RP
CK
AC
CL
HP
DS
HZ
LZ
IS
IH
Active to Ref/Active Command Period
Ref to Ref/Active Command Period
Active to Precharge Command Period
Active to Read/Write Command Delay Time
Active to Read with Auto Precharge Enable
Read/Write(a) to Read/Write(b) Command Period
Precharge to Active Command Period
Active(a) to Active(b) Command Period
Write Recovery Time
Auto Precharge Write Recovery + Precharge Time
CLK Cycle Time
Data Access Time from CLK, CLK
DQS Output Access Time from CLK, CLK
Data Strobe Edge to Output Data Edge Skew
CLk High Level Width
CLK Low Level Width
CLK Half Period (minimum of actual t
DQ Output Data Hold Time from DQS
DQS Read Preamble Time
DQS Read Postamble Time
DQ and DM Setup Time
DQ and DM Hold Time
DQ and DM Input Pulse Width (for each input)
DQS Input High Pulse Width
DQS Input Low Pulse Width
DQS Falling Edge to CLK Setup Time
DQS Falling Edge Hold Time from CLK
Clock to DQS Write Preamble Set-up Time
DQS Write Preamble Time
DQS Write Postamble Time
Write Command to First DQS Latching Transition
UDQS – LDQS Skew (x 16)
Input Setup Time
Input Hold Time
Control & Address Input Pulse Width (for each input)
Data-out High-impedance Time from CLK, CLK
Data-out Low-impedance Time from CLK, CLK
SSTL Input Transition
Internal Write to Read Command Delay
Exit Self Refresh to non-Read Command
Exit Self Refresh to Read Command
Refresh Time (8k)
Mode Register Set Cycle Time
PARAMETER
CH,
t
CL
CL = 2
CL = 2.5
)
- 10 -
(t
-0.75
-0.75
CL
-0.75
-0.25
-0.75
-0.75
MIN.
0.45
0.45
Min.
1.75
0.35
0.35
0.25
0.75
T
7.5
0.9
0.4
0.5
0.5
0.2
0.2
0.4
0.9
0.9
2.2
0.5
65
75
45
15
15
20
15
15
30
75
10
15
1
7
0
1
,t
HP
CH
-70
)
100000
MAX.
0.75
0.75
0.55
0.55
1.25
0.25
0.75
0.75
0.5
1.1
0.6
1.5
15
15
64
(t
-0.75
-0.75
CL
-0.75
-0.25
-0.75
-0.75
MIN.
0.45
0.45
Min.
1.75
0.35
0.35
0.25
0.75
T
7.5
0.9
0.4
0.5
0.5
0.2
0.2
0.4
0.9
0.9
2.2
0.5
65
75
45
20
15
20
15
15
30
75
10
15
1
8
0
1
,t
HP
CH
-75
)
100000
MAX.
W942508BH
0.75
0.75
0.55
0.55
1.25
0.25
0.75
0.75
0.5
1.1
0.6
1.5
15
15
64
UNITS NOTES
mS
nS
t
nS
t
nS
t
nS
t
nS
t
nS
t
t
nS
ns
CK
CK
CK
CK
CK
CK
CK
16
11
11
11
11