Abridged Data Sheet

DS2460

8 of 9

Since a 885

 pullup resistor, as would be required to meet the rise time specification at 400pF bus capacitance, is

the respective bus capacitance that yields a rise time of 300ns.

Only for pullup voltages of 3V and lower can the maximum permissible bus capacitance of 400pF be maintained. A

reduced bus capacitance of 300pF is acceptable for pullup voltages of 4V and lower. For fast speed operation at

any pullup voltage, the bus capacitance must not exceed 200pF. The corresponding pullup resistor value at the

Figure 11. I²C Fast Speed Pullup Resistor Selection Chart

0

400

800

1200

1600

2000

12

3

45

Pull-up Voltage

0

100

200

300

400

500

"Minimum Rp"

Max. Load at Min. Rp fast mode

I²C Bus Compliance

Although the I²C protocol definition does not explicitly forbid a START - STOP - START sequence, the DS2460

does not tolerate it. If a START, STOP, START sequence has been issued, transmit the following sequence before

communicating with the DS2460: START, 10xxxxxx byte (x = don’t care bits), ACK/NACK bit, STOP.

PACKAGE INFORMATION

For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-“ in the package code

indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of

RoHS status.

PACKAGE TYPE

PACKAGE CODE

DOCUMENT NO.

8 SO

S8+4

21-0041