EM42AM1684RTC
AC Operating Test Characteristics (Continued)
(VDD=2.5V±0.2V, TA=0°C ~70°C)
Symbol
Parameter
Units
0.4
0.6
0.4
0.6
tRPST
tRAS
tRC
Read Postamble
tCK
ns
ns
Active to Precharge command period
Active to Active command period
40
55
120k
-
42
60
120k
-
tRFC
tRCD
tRP
Auto Refresh Row Cycle Time
Active to Read or Write delay
Precharge command period
70
15
15
10
-
-
-
-
72
18
18
12
-
-
-
-
ns
ns
ns
ns
tRRD
Active bank A to B command period
tRAP
Active to READ with Auto Precharge command
DQS write Preamble
15
-
-
18
-
-
ns
tWPRE
0.25
0.25
tCK
tWR
tWTR
tXSNR
tXSRD
tREFI
Write Recovery time
15
2
-
15
2
-
ns
tCK
ns
ns
us
Internal WRITE to READ command delay
Exit self Refresh to non-read command
Exit self Refresh to read command
Average periodic refresh interval
-
-
-
-
75
200
-
75
200
-
-
-
7.8
7.8
Sep. 2010
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