 2003 Microchip Technology Inc.

Preliminary

DS21822C-page 3

25AA256/25LC256

TABLE 1-2:

AC CHARACTERISTICS

AC CHARACTERISTICS

Industrial (I):

Param.

No.

Sym.

Characteristic

Min.

Max.

Units

Test Conditions

Clock Frequency

—

—

—

10

5

3

MHz

MHz

MHz

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

CS Setup Time

50

100

150

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

CS Hold Time

100

200

250

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

CS Disable Time

50

—

ns

—

5

Tsu

Data Setup Time

10

20

30

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

Data Hold Time

20

40

50

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

CLK Rise Time

—

2

µs

(Note 1)

CLK Fall Time

—

2

µs

(Note 1)

Clock High Time

50

100

150

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

10

Clock Low Time

50

100

150

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

11

Clock Delay Time

50

—

ns

—

12

Clock Enable Time

50

—

ns

—

13

Output Valid from Clock

Low

—

—

—

50

100

160

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

14

Output Hold Time

0

—

ns

(Note 1)

15

Output Disable Time

—

—

—

40

80

160

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V(Note 1)

2.5V

≤ Vcc ≤ 4.5V(Note 1)

1.8V

≤ Vcc ≤ 2.5V(Note 1)

16

HOLD Setup Time

20

40

80

—

—

—

ns

ns

ns

4.5V

≤ Vcc ≤ 5.5V

2.5V

≤ Vcc < 4.5V

1.8V

≤ Vcc < 2.5V

Note 1: This parameter is periodically sampled and not 100% tested.

complete.

3: This parameter is not tested but ensured by characterization. For endurance estimates in a specific

application, please consult the Total Endurance™ Model which can be obtained from our web site:

www.microchip.com.