EM488M1644VTD

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Operating AC Characteristics

( VDD = 3.3V +/- 0.3 V, Ta = 0 ~ 70 °C)

Parameter

Symbol

-7

-7.5

Min. Max. Min. Max.

Units

Notes

Clock cycle time

CL = 3

CL = 2

7

7.5

ns

7.5

10

ns

Access time from CLK

CL = 3

CL = 2

5.4

5.4

ns

5.4

6

ns

CLK high level width

2.5

2.5

ns

CLK low level width

2.5

2.5

ns

Data-out hold time

CL = 3

CL = 2

3

3

ns

ns

Data-out high impedance time

CL = 3

CL = 2

3

7

3

7

ns

ns

Data-out low impedance time

0

0

ns

Input hold time

1

1

ns

Input setup time

1.5

1.5

ns

ACTIVE to ACTIVE command period

62

67

ns

2

ACTIVE to PRECHARGE command period

42 100k

45

100k

ns

2

PRECHARGE to ACTIVE command period

3

3

CLK

2

ACTIVE to READ/WRITE delay time

3

3

CLK

2

ACTIVE(one) to ACTIVE(another) command

2

2

CLK

2

READ/WRITE command to READ/WRITE

command

1

1

CLK

Data-in to PRECHARGE command

2

2

CLK

Data-in to BURST stop command

1

1

CLK

Data-out to high impedance

from PRECHARGE command

CL = 3

CL = 2

3

3

CLK

2

2

CLK

Refresh time(4,096 cycle)

64

64

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