EM42AM1684RTC
AC Operating Test Characteristics (Continued)
(V
DD
=2.5V±0.2V, T
A
=0°C ~70°C)
Symbol
t
RPST
t
RAS
t
RC
t
RFC
t
RCD
t
RP
t
RRD
t
RAP
t
WPRE
t
WR
t
WTR
t
XSNR
t
XSRD
t
REFI
Read Postamble
Active to Precharge command period
Active to Active command period
Auto Refresh Row Cycle Time
Active to Read or Write delay
Precharge command period
Active bank A to B command period
Active to READ with Auto Precharge command
DQS write Preamble
Write Recovery time
Internal WRITE to READ command delay
Exit self Refresh to non-read command
Exit self Refresh to read command
Average periodic refresh interval
Parameter
Min.
0.4
40
55
70
15
15
10
15
0.25
15
2
75
200
-
-5
Max.
0.6
120k
-
-
-
-
-
-
-
-
-
-
-
7.8
Min.
0.4
42
60
72
18
18
12
18
0.25
15
2
75
200
-
-6
Max.
0.6
120k
-
-
-
-
-
-
-
-
-
-
-
7.8
Units
t
CK
ns
ns
ns
ns
ns
ns
ns
t
CK
ns
t
CK
ns
ns
us
Sep. 2010
9/21
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