eorex
Preliminary
EM42BM1684LBB
AC Operating Test Characteristics (Continued)
(VDD=1.8V±0.1V, TA=0°C ~70°C)
-75
Units
Symbol
Parameter
Read Postamble
Min.
0.4
Max.
0.6
tRPST
tRAS
tCK
ns
Active to Precharge command period
Active to Active command period
Auto Refresh Row Cycle Time
Active to Read or Write delay
45
75
120k
tRC
tRFC
tRCD
tRP
-
-
-
-
-
ns
ns
ns
ns
ns
108
30
Precharge command period
22.5
15
tRRD
Active bank A to B command period
Column address to column address
delay
tCCD
1
-
tCK
tHZP
tCDLW
tDPL
Pre-charge command to high-Z
Last data in to Write command
Last data in to Precharge command
3
1
3
-
-
-
tCK
tCK
tCK
tSREX
tWTR
Exit self refresh to non-col. command
Internal Write to Read command delay
16
1
-
-
tCK
tCK
tCKE
tWPD
tRPD
CKE minimum pulse width
2
-
tCK
tCK
tCK
tCK
tCK
tCK
us
Write to pre-charge delay(same bank) 3+BL/2
-
Read to pre-charge delay(same bank)
Write to Read command delay
Burst stop to write delay
BL/2
-
tWRD
tBSTW
tWRD
tREFI
2+BL/2
-
-
3
2
-
Write recovery
-
Average periodic refresh interval
7.8
Jul. 2006
www.eorex.com
8/20
EOREX [ EOREX CORPORATION ]
