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DS28CZ04: 4Kb I2C/SMBus EEPROM with Nonvolatile PIO
For I2C systems, the rise time and fall time are measured from 30% to 70% of the pullup voltage. The maximum
bus capacitance C B is 400pF. The maximum rise time must not exceed 300ns. Assuming maximum rise time, the
maximum resistor value at any given capacitance C B is calculated as: R PMAX = 300ns/(C B * ln(7/3)) . For a bus
capacitance of 400pF the maximum pullup resistor would be 885 Ω .
Since an 885 Ω pullup resistor, as would be required to meet the rise time specification and 400pF bus capacitance,
is lower than R PMIN at 5.25V, 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 R P " line) and then calculating
the respective bus capacitance that yields a rise time of 300ns.
Only for pullup voltages of 4V and lower can the maximum permissible bus capacitance of 400pF be maintained. A
reduced bus capacitance of 300pF is acceptable for the entire operating voltage range. The corresponding pullup
resistor value at the voltage is indicated by the "Minimum R P " line.
Figure 12. I2C Fast Speed Pullup Resistor Selection Chart
1200
1000
800
600
400
200
0
"Minimum Rp"
Max. Load at Min. Rp fast mode
600
500
400
300
200
100
0
2
2.5
3
3.5
4
4.5
5
Pull-up Voltage
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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