 2004 Microchip Technology Inc.

DS21223G-page 3

25AA640/25LC640

TABLE 1-2:

AC CHARACTERISTICS

AC CHARACTERISTICS

Industrial (I):

Param.

No.

Sym

Characteristic

Min

Max

Units

Conditions

Clock Frequency

—

—

—

3

2

1

MHz

MHz

MHz

CS Setup Time

100

250

500

—

—

—

ns

ns

ns

CS Hold Time

150

250

475

—

—

—

ns

ns

ns

CS Disable Time

500

—

ns

Data Setup Time

30

50

50

—

—

—

ns

ns

ns

Data Hold Time

50

100

100

—

—

—

ns

ns

ns

CLK Rise Time

—

2

µs

(Note 1)

CLK Fall Time

—

2

µs

(Note 1)

Clock High Time

150

230

475

—

—

—

ns

ns

ns

10

Clock Low Time

150

230

475

—

—

—

ns

ns

ns

11

Clock Delay Time

50

—

ns

12

Clock Enable Time

50

—

ns

13

Output Valid from

Clock Low

—

—

—

150

230

475

ns

ns

ns

14

Output Hold Time

0

—

ns

(Note 1)

15

Output Disable Time

—

—

—

200

250

500

ns

ns

ns

16

HOLD Setup Time

100

100

200

—

—

—

ns

ns

ns

17

HOLD Hold Time

100

100

200

—

—

—

ns

ns

ns

18

HOLD Low to Output

High-Z

100

150

200

—

—

—

ns

ns

ns

19

HOLD High to Output

Valid

100

150

200

—

—

—

ns

ns

ns

20

Internal Write Cycle

Time

—5

ms

21

—

Endurance

1M

—

E/W

Cycles

(Note 3)

Note

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

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

please consult the Total Endurance™ Model which can be obtained from our web site.