25AA640/25LC640/25C640

© 1997 Microchip Technology Inc.

Preliminary

DS21223A-page 3

TABLE 1-3:

AC CHARACTERISTICS

All parameters apply over the

specified operating ranges

unless otherwise noted.

Commercial (C):

Tamb = 0

°C to +70°C

Industrial (I):

Tamb = -40

°C to +85°C

Automotive (E):

Tamb = -40

°C to +125°C

Parameter

Symbol

Min

Max

Units

Test 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

250

475

—

—

—

ns

ns

ns

Clock Low Time

150

250

475

—

—

—

ns

ns

ns

Clock Delay Time

50

—

ns

Clock Enable Time

50

—

ns

Output Valid from

Clock Low

—

—

—

150

250

475

ns

ns

ns

Output Hold Time

0

—

ns

(Note 1)

Output Disable Time

—

—

—

200

250

500

ns

ns

ns

HOLD Setup Time

100

100

200

—

—

—

ns

ns

ns

HOLD Hold Time

100

100

200

—

—

—

ns

ns

ns

HOLD Low to Output High-Z

100

150

200

—

—

—

ns

ns

ns

HOLD High to Output Valid

100

150

200

—

—

—

ns

ns

ns

Internal Write Cycle Time

—

5

ms

Endurance

—

1M

—

E/W Cycles

(Note 2)

Note 1:

This parameter is periodically sampled and not 100% tested.

2:

This parameter is not tested but guaranteed by characterization. For endurance estimates in a specific application, please

consult the Total Endurance Model which can be obtained on Microchip’s BBS or website.