____________________________________________
EM488M1644VTD
Operating AC Characteristics
( VDD = 3.3V +/- 0.3 V, Ta = 0 ~ 70 °C)
Parameter
Symbol
-7
-7.5
Units
Notes
Min. Max. Min. Max.
Clock cycle time
Access time from CLK
CLK high level width
CLK low level width
Data-out hold time
Data-out high impedance time
Data-out low impedance time
Input hold time
Input setup time
ACTIVE to ACTIVE command period
ACTIVE to PRECHARGE command period
PRECHARGE to ACTIVE command period
ACTIVE to READ/WRITE delay time
ACTIVE(one) to ACTIVE(another) command
READ/WRITE command to READ/WRITE
command
Data-in to PRECHARGE command
Data-in to BURST stop command
Data-out to high impedance
from PRECHARGE command
Refresh time(4,096 cycle)
CL = 3
CL = 2
t
EF
CL = 3
CL = 2
CL = 3
CL = 2
t
LZ
t
IH
t
IS
t
RC
t
RAS
t
RP
t
RCD
t
RRD
t
CCD
0
1
1.5
62
42
3
3
2
1
100k
0
1
1.5
67
45
3
3
2
1
100k
CL = 3
CL = 2
CL = 3
CL = 2
t
CH
t
CL
t
OH
t
HZ
2.5
2.5
3
3
7
t
CK
t
AC
7
7.5
5.4
5.4
2.5
2.5
3
3
7
7.5
10
5.4
6
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
CLK
CLK
CLK
CLK
2
2
2
2
2
t
DPL
t
BDL
t
ROH
2
1
3
2
64
2
1
3
2
64
CLK
CLK
CLK
CLK
ms
＊
All voltages referenced to Vss.
Note :
1. tHZ defines the time at which the output achieve the open circuit
condition and is not referenced to output voltage levels.
2. These parameters account for the number of clock cycles and
depend on the operating frequency of the clock, as follows :
The number of clock cycles = Specified value of timing/clock period
(Count fractions as a whole number)
5
EOREX [ EOREX CORPORATION ]
