DS2460S-R Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2460S-R

SHA-1 Coprocessor with EEPROM

Dallas Semiconductor -> Maxim Integrated 

Abridged Data Sheet

DS2460

Since a 885Ω pullup resistor, as would be required to meet the rise time specification at 400pF bus capacitance, is

lower than RPMIN at 5.5V, a different approach is necessary. The "Max. Load…" line in Figure 11 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 11. 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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