W942508CH Datasheet, PDF (12/47 Pages) Winbond – 8M x 4 BANKS x 8 BIT DDR SDRAM

W942508CH
SYM.
tRC
tRFC
tRAS
tRCD
tRAP
tCCD
tRP
tRRD
tWR
tDAL
tCK
tAC
tDQSCK
tDQSQ
tCH
tCL
tHP
tQH
tRPRE
tRPST
tDS
tDH
tDIPW
tDQSH
tDQSL
tDSS
tDSH
tWPRES
tWPRE
tWPST
tDQSS
tDSSK
tIS
tIH
tIPW
tHZ
tLZ
tT(SS)
tWTR
tXSNR
tXSRD
tREF
tMRD
PARAMETER
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
2.5
3
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 tCH, tCL)
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
-5
MIN. MAX.
55
70
40 70000
15
15
1
15
10
15
30
5
10
5
10
-0.7
0.7
-0.55
0.45
0.45
min
(tCL,tCH)
tHP
-0.5
0.9
0.4
0.4
0.4
1.75
0.35
0.35
0.2
0.2
0
0.25
0.4
0.72
-0.25
0.6
0.6
2.2
0.55
0.4
0.55
0.55
1.1
0.6
0.6
1.28
0.25
Max tAC
-6
MIN. MAX.
60
72
42 100000
18
15
1
18
12
15
30
6
12
6
12
-0.7
0.7
-0.6
0.6
0.45
0.45
0.55
0.45
0.55
Min,
(tCL,tCH)
tHP
-0.55
0.9
1.1
0.4
0.6
0.45
0.45
1.75
0.35
0.35
0.2
0.2
0
0.25
0.4
0.6
0.75
1.25
-0.25 0.25
0.75
0.75
2.2
-0.7
0.7
UNITS NOTES
nS
tCK
nS
16
tCK
11
nS
tCK
11
nS
tCK
11
nS
11
tCK
nS
-0.7
0.7
-0.7
0.7
0.5
1.5
0.5
1.5
2
2
tCK
75
75
ns
10
10
tCK
64
64
mS
10
12
nS
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