EBD25RB4ALFA
Synchronous Characteristics Example
tCK
7.5 ns
min.
3.4
10 ns
min.
4.5
4.5
9
Symbol
tCH
max.
4.1
4.1
8.25
4.5
—
max.
5.5
5.5
11
6
Unit
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
tCL
3.4
tRPRE
tRPST
tWPRE
tWPST
tDQSS
tDQSH
tDQSL
tDSS
6.75
3
4
0.25
3
2.5
4
—
4.5
9.4
—
6
5.6
7.5
3.5
3.5
2
12.5
—
2.63
2.63
1.5
—
—
—
—
tDSH
1.5
—
2
—
tWTR
7.5
—
10
—
Asynchronous Characteristics
-7A
-75
-1A
Parameter
Symbol
tRC
min.
max.
min.
max.
—
min.
70
max.
—
Unit
ns
ACT to REF/ACT command period
(operation)
65
75
—
—
65
75
REF to REF/ACT command period
(refresh)
tRFC
—
80
—
ns
ACT to PRE command period
PRE to ACT command period
ACT to READ/WRITE delay
tRAS
tRP
45
20
20
120,000 45
120,000 50
120,000 ns
—
—
20
20
—
—
20
20
—
—
ns
ns
tRCD
ACT(one) to ACT(another) command
period
tRRD
tWR
15
—
—
—
15
—
—
—
15
—
—
—
ns
Write recovery time
2
2
2
CLK
ns
Auto precharge write recovery time
+ precharge time
tDAL
TBD
TBD
TBD
Mode register set command cycle time
Exit self refresh to command
tMRD
15
75
—
—
15
75
—
—
15
80
—
—
ns
ns
µs
tXSNR
tREF1
—
—
—
Average periodic Refresh interval
15.6
15.6
15.6
Preliminary Data Sheet E0211E11 (Ver. 1.1)
14
ELPIDA [ ELPIDA MEMORY ]
