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