© 1998 Microchip Technology Inc.

DS21203C-page 3

24AA256/24LC256

TABLE 1-3

AC CHARACTERISTICS

All parameters apply across the spec-

ified operating ranges unless other-

wise noted.

Industrial (I):

Tamb = -40

°C to +85°C

Tamb = -40

°C to 125°C

Parameter

Symbol

Min

Max

Units

Conditions

Clock frequency

—

—

—

100

100

400

kHz

4.5V

1.8V

2.5V

Clock high time

4000

4000

600

—

—

—

ns

4.5V

1.8V

2.5V

Clock low time

4700

4700

1300

—

—

—

ns

4.5V

1.8V

2.5V

SDA and SCL rise time

(Note 1)

—

—

—

1000

1000

300

ns

4.5V

1.8V

2.5V

SDA and SCL fall time

—

300

ns

(Note 1)

START condition hold time

4000

4000

600

—

—

—

ns

4.5V

1.8V

2.5V

START condition setup time

4700

4700

600

—

—

—

ns

4.5V

1.8V

2.5V

Data input hold time

0

—

ns

(Note 2)

Data input setup time

250

250

100

—

—

—

ns

4.5V

1.8V

2.5V

STOP condition setup time

4000

4000

600

—

—

—

ns

4.5V

1.8V

2.5V

WP setup time

4000

4000

600

—

—

—

ns

4.5V

1.8V

2.5V

WP hold time

4700

4700

1300

—

—

—

ns

4.5V

1.8V

2.5V

Output valid from clock

(Note 2)

—

—

—

3500

3500

900

ns

4.5V

1.8V

2.5V

Bus free time: Time the bus must be

free before a new transmission can

start

4700

4700

1300

—

—

—

ns

4.5V

1.8V

2.5V

10

250

ns

Input filter spike suppression

(SDA and SCL pins)

—

50

ns

(Notes 1 and 3)

Write cycle time (byte or page)

—5

ms

Endurance

100,000

—

cycles

25

Note 1:

2:

As a transmitter, the device must provide an internal minimum delay time to bridge the undefined region (minimum

300 ns) of the falling edge of SCL to avoid unintended generation of START or STOP conditions.

3:

suppression. This eliminates the need for a TI specification for standard operation.

4:

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.