eorex

EM488M1644VTF

Jan. 2011

www.eorex.com

AC Operating Test Characteristics (Continued)

, V

-6

-7

Symbol

Parameter

Min.

Max.

Min.

Units

Max.

ACTIVE to ACTIVE Command

Period

t

60

-

63

-

ns

(Note 6)

RC

ACTIVE to PRECHARGE

Command Period

t

42

100k

45

100k

ns

(Note 6)

RAS

PRECHARGE to ACTIVE

Command Period

t

15

-

15

-

ns

(Note 6)

RP

ACTIVE to READ/WRITE Delay

Time

t

15

-

15

-

ns

(Note 6)

RCD

ACTIVE(one) to ACTIVE(another)

Command

t

12

-

14

-

ns

(Note 6)

RRD

READ/WRITE Command to

READ/WRITE Command

t

1

-

1

-

CLK

CCD

Date-in to PRECHARGE

Command

2

-

2

-

CLK

Write Recovery Time for Auto

Precharge

t

2

-

2

-

CLK

WR

t

DQM Write Mask Latency

0

-

0

-

CLK

DQW

t

DQM Data out Disable Latency

-

2

-

2

CLK

DQZ

t

Refresh Time (4,096 cycles)

-

64

-

64

ms

REF

t

Self Refresh Exit Time

1

-

1

-

CLK

SREX

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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