DS2482-800 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

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DS2482-800

Eight-Channel 1-Wire Master

Dallas Semiconductor -> Maxim Integrated 

DS2482-800: Eight-Channel 1-Wire Master

capacitance of 400pF the maximum pullup resistor values are 2.95kW at standard speed and 885W at fast speed. A

value between of 1.7kW and 2.95kW meets all requirements at standard speed.

Since a 885W pullup resistor, as would be required to meet the rise time specification at fast speed and 400pF bus

capacitance, is lower than Rpmin at 5.5V, a different approach is necessary. The "Max. Load…" line in Figure 12 is

generated by first calculating the minimum pullup resistor at any given operating voltage ("Minimum Rp" line) and

then calculating 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

voltage is indicated by the "Minimum Rp" line.

Figure 12. I²C Fast Speed Pullup Resistor Selection Chart

"Minimum Rp"

Max. Load at Min. Rp fast mode

2000

1600

1200

800

400

0

1

2

3

4

Pull-up Voltage

500

400

300

200

100

0

5

PACKAGE INFORMATION

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to

www.maxim-ic.com/DallasPackInfo.)

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