W949D6CB Datasheet, PDF (52/60 Pages) Winbond – 512Mb Mobile LPDDR

W949D6CB / W949D2CB
PARAMETER
SYMBOL
period
Write preamble setup time
Write postamble
Write preamble
Read preamble
CL = 3
CL = 2
Read postamble
ACTIVE to PRECHARGE command
period
tWPRES
tWPST
tWPRE
tRPRE
tRPST
tRAS
ACTIVE to ACTIVE command period
tRC
AUTO REFRESH to ACTIVE/AUTO
REFRESH command period
tRFC
ACTIVE to READ or WRITE delay
tRCD
PRECHARGE command period
tRP
ACTIVE bank A to ACTIVE bank B
delay
tRRD
WRITE recovery time
tWR
Auto precharge write recovery +
precharge time
tDAL
Internal write to Read command delay tWTR
Self Refresh exit to next valid command _tXSR
delay
Exit power down to next valid command _tXP
delay
CKE min. pulse width (high and low
pulse width)
tCKE
Refresh Period
tREF
Average periodic refresh interval
tREFI
MRS for SRR to READ
tSRR
READ of SRR to next valid command tSRC
-5
MIN
MAX
0
0.4
0.6
0.25
0.9
1.1
0.5
1.1
0.4
0.6
40 70,000
tRAS+
tRP
72
15
3
10
15
-
2
120
2
1
64
7.8
2
CL+1
-6
MIN
MAX
0
0.4
0.25
0.9
0.5
0.4
42
tRAS+
tRP
72
18
3
12
15
-
2
120
0.6
1.1
1.1
0.6
70,000
1
1
64
7.8
2
CL+1
512Mb Mobile LPDDR
- 75
MIN
MAX
UNIT
NOTES
0
ns
21
0.4
0.6
tCK
22
0.25
tCK
0.9
1.1
tCK
23
0.5
1.1
tCK
23
0.4
0.6
tCK
45
70,000 ns
tRAS+
ns
tRP
72
ns
22.5
ns
3
tCK
15
ns
15
ns
24
-
tCK
25
1
tCK
120
ns
26
1
tCK
27
1
tCK
64
ms
7.8
μs
28,29
2
tCK
CL+1
tCK
- 52 -
Publication Release Date: Sep, 21, 2011
Revision A01-007