eorex
EM44AM1684LBA
AC Operating Test Characteristics (Continued)
(VDD=1.8V±0.1V, TA=0°C ~85°C)
-3
-37
-5
Unit
Symbol
Parameter
Read Postamble
Min.
0.4
Max.
0.6
Min.
0.4
Max.
0.6
Min.
0.4
Max.
0.6
tRPST
tRAS
tCK
ns
Active to Precharge command period
45
70K
45
70K
45
70K
tRC
tRFC
tRCD
tRP
Active to Active command period
Auto Refresh Row Cycle Time
Active to Read or Write delay
Precharge command period
60
105
15
-
-
-
-
-
60
105
15
-
-
-
-
-
60
105
15
-
-
-
-
-
ns
ns
ns
ns
ns
15
15
15
tRRD
Active bank A to B command period
10
10
10
Column address to column address
delay
tCCD
tWR
2
-
-
-
2
-
-
-
2
-
-
-
tCK
ns
tCK
Write recovery time
15
15
15
Auto Pre-charge write recovery +
pre-charge time
tRP+
tWR
tRP+
tWR
tRP+
tWR
tDAL
tXSRD
tXSNR
Exit self refresh to Read command
Exit self refresh to non-read command
Exit active power-down mode to Read
command (Fast exit)
Exit active power-down mode to Read
command (Slow exit)
200
115
-
-
200
115
-
-
200
115
-
-
tCK
ns
tXARD
tXARDS
tXP
2
7-AL
2
-
-
-
2
6-AL
2
-
-
-
2
6-AL
2
-
-
-
tCK
tCK
tCK
Exit pre-charge power-down to any
non-read command
tWTR
tRTP
Internal Write to Read command delay
7.5
7.5
-
-
7.5
7.5
-
-
10
-
-
ns
ns
Internal Read to pre-charge delay
CKE minimum pulse width
7.5
tCKE
3
-
3
-
3
-
tCK
WL+
WL+
WL+
BL/2 +
BL/2 +
BL/2 +
tWPD
Write to pre-charge delay(same bank)
-
-
-
tCK
tWR
AL+
BL/2+1
tWR
AL+
BL/2+1
tWR
AL+
BL/2+1
tRPD
tOIT
Read to pre-charge delay(same bank)
OCD drive mode output delay
-
-
-
tCK
ns
us
0
-
12
7.8
0
-
12
7.8
0
12
7.8
tREFI
Average periodic refresh interval
-
Jul. 2006
www.eorex.com
11/29
EOREX [ EOREX CORPORATION ]
