eorex

EM484M1644VTC

Dec. 2007

www.eorex.com

Note 5.2: AC characteristics assumed input rise and fall time (tr & tf) = 1ns.

If tr & tf is longer than 1ns, transient time compensation should be considered,

i.e., following compensation should be added to the parameter.

For example:

to output voltage levels.

AC Operating Test Characteristics (Continued)

-6

-7

Symbol

Parameter

Min.

Max.

Min.

Max.

Units

ACTIVE to ACTIVE Command

Period

(Note 6)

60

62

ns

ACTIVE to PRECHARGE

Command Period

(Note 6)

40

100k

42

100k

ns

PRECHARGE to ACTIVE

Command Period

(Note 6)

18

18

ns

ACTIVE to READ/WRITE Delay

Time

(Note 6)

18

18

ns

ACTIVE(one) to ACTIVE(another)

Command

(Note 6)

12

14

ns

READ/WRITE Command to

READ/WRITE Command

1

1

CLK

Date-in to PRECHARGE

Command

2

2

CLK

Date-in to BURST Stop Command

1

1

CLK

CL=3

3

3

Data-out

to High

Impedance from

PRECHARGE Command

CL=2

2

CLK

Refresh Time (4,096 cycle)

64

64

ms

Note 6: 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)

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