W948D6FBHX5E-TR Datasheet, PDF (52/60 Pages) Winbond – 256Mb Mobile LPDDR

W948D6FB / W948D2FB
PARAMETER
SYMBOL
Write preamble setup time
Write postamble
Write preamble
Read preamble
CL = 3
CL = 2
Read postamble
ACTIVE to PRECHARGE command
period
ACTIVE to ACTIVE command period
tWPRES
tWPST
tWPRE
tRPRE
tRPST
tRAS
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 (x16) tREFI
Average periodic refresh interval (x32) 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
15.6
2
CL+1
-6
MIN
MAX
0
0.4
0.6
0.25
0.9
1.1
0.5
1.1
0.4
0.6
256Mb 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
42
70,000
45
70,000 ns
tRAS+
tRP
tRAS+
ns
tRP
72
72
ns
18
22.5
ns
3
3
tCK
12
15
ns
15
15
ns
24
-
-
tCK
25
2
1
tCK
120
120
ns
26
1
1
tCK
27
1
1
tCK
64
64
ms
7.8
7.8
μs
28,29
15.6
15.6
μs
28,29
2
2
tCK
CL+1
CL+1
tCK
- 52 -
Publication Release Date : Oct, 15, 2012
Revision : A01-004