EM42BM1684RBA
AC Operating Test Characteristics (Continued)
(VDD=2.5V±0.2V, TA=0°C ~70°C)
-5
-6
Symbol
Units
Parameter
Min.
0.4
Max.
0.6
Min.
Max.
0.6
Read Postamble
tRPST
tRAS
0.4
42
tCK
Active to Precharge
command period
40
55
70
15
70k
70k
ns
Active to Active
command period
tRC
-
-
-
60
72
18
-
-
-
ns
ns
ns
Auto Refresh Row
Cycle Time
tRFC
Active to Read or
Write delay
tRCD
tRP
Precharge command
period
15
15
10
2.2
-
-
-
-
18
15
12
2.2
-
-
-
-
ns
ns
ns
ns
Write recover time
tWR
Active bank A to B
command period
tRRD
Control & Address
Input width
tIPW
tRAP
Active to READ with
Auto Precharge
command
15
-
18
-
ns
DQS read preamble
tRPRE
tWTR
0.9
2
1.1
-
0.9
1
1.1
-
tCK
tCK
ns
tCK
us
Internal write to read
command delay
Exit self Refresh to
non-read command
-
-
-
-
tXSNR
tXSRD
tREFI
75
75
Exit self Refresh to
read command
200
-
200
-
Average periodic
refresh interval
7.8
7.8
Dec. 2010
11/23
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