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
CL = 3
tCK
7
7.5
10
ns
CL = 2
CL = 3
7.5
ns
ns
Access time from CLK
tAC
5.4
5.4
5.4
6
CL = 2
ns
ns
CLK high level width
CLK low level width
Data-out hold time
tCH
tCL
tOH
2.5
2.5
3
2.5
2.5
3
ns
ns
CL = 3
CL = 2
CL = 3
ns
ns
Data-out high impedance time
tHZ
3
7
3
7
CL = 2
ns
Data-out low impedance time
Input hold time
tLZ
tIH
tIS
0
1
0
1
ns
ns
ns
Input setup time
1.5
1.5
ACTIVE to ACTIVE command period
ACTIVE to PRECHARGE command period
PRECHARGE to ACTIVE command period
ACTIVE to READ/WRITE delay time
tRC
tRAS
tRP
62
67
ns
2
2
2
2
42 100k 45 100k ns
3
3
3
3
CLK
CLK
tRCD
ACTIVE(one) to ACTIVE(another) command
READ/WRITE command to READ/WRITE
tRRD
tCCD
2
1
2
1
CLK
CLK
2
command
Data-in to PRECHARGE command
tDPL
tBDL
tROH
2
1
3
2
1
3
CLK
CLK
CLK
Data-in to BURST stop command
Data-out to high impedance
from PRECHARGE command
CL = 3
CL = 2
2
2
CLK
ms
Refresh time(4,096 cycle)
tEF
64
64
＊ 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 ]
