Rainbow Electronics DS1904 - Manual (Page 12)

DS1904
12 of 12
NOTES:
1. All voltages are referenced to ground.
2. V
PUP
= 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 V
IL1MAX
may have to be reduced to as much as 0.5V to always
guarantee a presence pulse.
6. The reset low time (t
RSTL
) 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.