July 2005

Rev. 2

W3DG6463V-D2

5

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

White Electronic Designs

PRELIMINARY

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

ELECTRICAL CHARACTERISTICS AND RECOMMENDED AC OPERATING CONDITIONS

AC CHARACTERISTICS

SYMBOL

7

7.5

10

UNITS

NOTE

PARAMETER

MIN

MAX

MIN

MAX

MIN

MAX

Access timefrom CLK (pos.edge)

CL = 3

5.4

5.4

6

ns

27

CL = 2

5.4

6

6

ns

Address hold time

0.8

0.8

1

ns

Address setup time

1.5

1.5

2

ns

CLK high-level width

2.5

2.5

3

ns

CLK low-level width

2.5

2.5

3

ns

Clock cycle time

CL = 3

7

7.5

8

ns

23

CL = 2

7.5

10

10

ns

23

CKE hold time

0.8

0.8

1

ns

CKE setup time

1.5

1.5

2

ns

CS#, RAS#, CAS#, WE#, DQM hold time

0.8

0.8

1

ns

CS#, RAS#, CAS#, WE#, DQM setup time

1.5

1.5

2

ns

Data-in hold time

0.8

0.8

1

ns

Data-in setup time

1.5

1.5

2

ns

Data-out high-impedance time

CL = 3

5.4

5.4

6

ns

10

CL = 2

5.4

6

6

ns

10

Data-out low-impedance time

111

ns

Data-out hold time (load)

2.7

2.7

2.7

ns

Data-out hold time (no load)

1.8

1.8

1.8

ns

28

ACTIVE to PRECHARGE command

37

120,000

44

120,000

50

120,000

ns

ACTIVE to ACTIVE command period

60

66

66

ns

ACTIVE to READ or WRITE delay

15

20

20

ns

Refresh period

64

64

64

ms

AUTOREFRESH period

66

66

66

ns

PRECHARGE command period

15

20

20

ns

ACTIVE bank a to ACTIVE bank b command

14

15

15

ns

Transition time

0.3

1.2

0.3

1.2

0.3

1.2

ns

7

WRITE recovery time

1 CLK

+

7ns

1 CLK

+

7.5ns

1 CLK

+

7.5ns

24

14

15

15

ns

25

Exit SELF REFRESH to ACTIVE command

67

75

80

ns

20