DS1904 データシートの表示（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1904

RTC iButton

Dallas Semiconductor -> Maxim Integrated 

NOTES:

1. All voltages are referenced to ground.

DS1904

2. VPUP = external pull-up voltage.

3. Input load is to ground.

4. Read data setup time refers to the time the host must pull the 1-Wire bus low to read a bit. Data is

guaranteed to be valid within 1 µs of this falling edge.

5. Under certain low voltage conditions VIL1MAX may have to be reduced to as much as 0.5V to always

guarantee a presence pulse.

6. The reset low time (tRSTL) should be restricted to a maximum of 960 µs, to allow interrupt signaling,

otherwise, it could mask or conceal interrupt pulses.

7. The master must read while the data is valid.

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