eorex
EM42BM3284LBA
AC Operating Test Characteristics (Continued)
(VDD=1.8V±0.1V, TA=0°C ~70°C)
-6
-75
Symbol
Parameter
Units
Min.
0.4
Max.
0.6
Min.
0.4
Max.
0.6
tRPST
tRAS
Read Postamble
tCK
ns
Active to Precharge command
period
42
120k
45
120k
tRC
tRFC
tRCD
tRP
Active to Active command period
Auto Refresh Row Cycle Time
Active to Read or Write delay
Precharge command period
60
75
ns
ns
ns
ns
138
30
138
30
22.5
22.5
tRRD
tCCD
Active bank A to B command period
12
15
ns
Column address to column address
delay
1
1
tCK
tCDLR
tHZP
tCDLW
tDPL
Last data in to Read command
Pre-charge command to high-Z
Last data in to Write command
Last data in to Precharge command
2.5 tCK- tDQSS
2.5 tCK- tDQSS
tCK
tCK
3
1
3
3
1
3
tCK
tCK
Internal Write to Read command
delay
tCK
tWTR
tCKE
tWPD
2
1
CKE minimum pulse width
2
2
tCK
tCK
Write to pre-charge delay(same
bank)
4+
BL/2
3+
BL/2
Read to pre-charge delay(same
bank)
tCK
tCK
tRPD
BL/2
BL/2
3+
BL/2
2+
BL/2
tWRD
Write to Read command delay
tBSTW
tWR
Burst stop to write delay
Write recovery
3
3
tCK
ns
15
15
Exit self Refresh to non-read
command
tXSNR
120
120
ns
tXSRD
tREFI
Exit self Refresh to read command
Average periodic refresh interval
200
7.8
200
7.8
ns
us
Feb. 2009
www.eorex.com
10/24
EOREX [ EOREX CORPORATION ]
