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White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com

White Electronic Designs

WV3DG64127V-D2

April 2005

Rev. 0

White Electronic Designs Corp. reserves the right to change products or specifications without notice.

ADVANCED*

OPERATING AC PARAMETER

Parameter

Symbol

Version

Unit

Note

775

10

Row active to row active delay

15

15

20

ns

1

RAS# to CAS# delay

15

20

20

ns

1

Row precharge time

15

20

20

ns

1

Row active time

45

45

50

ns

1

100

us

Row cycle time

60

65

70

ns

1

Last data in to row precharge

2CLK

2

Last data in to Active delay

2 CLK + tRP

—

Last data in to new col. address delay

1CLK

2

Last data in to burst stop

1CLK

2

Col. address to col. address delay

1CLK

3

Number of valid output data

CAS latency=3

2

ea

4

CAS latency=2

1

Notes:

1.

The minimum number of clock cycles is determined by dividing the minimum time required with clock cycle time and then rounding off to the next higher integer.

2.

Minimum delay is required to complete write.

3.

All parts allow every cycle column address change.

4.

In case of row precharge interrupt, auto precharge and read burst stop.

AC OPERATING TEST CONDITIONS

Parameter

Value

Unit

2.4/0.4

V

Input timing measurement reference level

1.4

V

Input rise and fall time

ns

Output timing measurement reference level

1.4

V

Output load condition

See Fig. 2

DC OUTPUT LOAD CIRCUIT

AC OUTPUT LOAD CIRCUIT

3.3V

1200Ω

870Ω

Output

50pF

Vtt = 1.4V

50Ω

Output

50pF

Z0 = 50Ω