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

White Electronic Designs

WED416S16030A

April 2006

Rev. 1

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

OPERATING AC PARAMETERS

(Vcc = 3.3V, -40°C ≤ Ta ≤ +85°C)

Parameter

Symbol

7

75

8

10

Unit

Notes

Clock Cycle Time

CAS latency = 3

7.5

7.5

8

10

ns

1

CAS latency = 2

7.5

8

10

1

Clock to Valid Output Delay

5.4

6

6

7

ns

1,2

Output Data Hold Time

3

3

3

3

ns

2

Clock High Pulse Width

2.5

2.5

3

3

ns

3

Clock Low Pulse Width

2.5

2.5

3

3

ns

3

Input Setup Time

1.5

1.5

2

2

ns

3

Input Hold Time

0.8

0.8

1

1

ns

3

Clock to Output in Low-Z

1

1

1

1

ns

2

Clock to Output in High-Z

5.4

6

6

7

ns

Row Active to Row Active Delay

15

15

20

20

ns

4

RAS# to CAS# Delay

20

20

20

20

ns

4

Row Precharge Time

20

20

20

20

ns

4

Row Active Time

45

45

50

50

ns

4

Row Cycle Time - Operation

65

65

70

70

ns

4

Last Data In to New Column Address Delay

1

1

1

1

CK

5

Last Data In to Row Precharge

2

2

2

2

CK

5

Last Data In to Burst Stop

1

1

1

1

CK

5

Column Address to Column Address Delay

1

1

1

1

CK

6

Number of Valid Output Data

CAS latency = 3

2

2

2

2

ea

7

CAS latency = 2

1

1

1

1

Data Setup Time

1.5

1.5

2

2

ns

Data Hold Time

0.8

0.8

1

1

ns

NOTES:

1.

Parameters depend on programmed CAS latency.

2.

3.

4.

The minimum number of clock cycles required is determined by dividing the minimum time required by the clock cycle time and then

rounding up to the next higher integer.

5.

Minimum delay is required to complete write.

6.

All devices allow every cycle column address changes.

7.

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

AC CHARACTERISTICS