DS1994

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Reset Time Low (Note 7)

480

960

ms

Presence Detect High

15

60

ms

Presence Detect Low

60

240

ms

Note 1: All voltages are referenced to ground.

Note 3: Input load is to ground.

Note 4: An additional reset or communication sequence cannot begin until the reset high time has

expired.

Note 5: 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

ms of this falling edge and remains valid for 14ms minimum. (15ms

total from falling edge on 1-Wire bus.)

Note 6: Capacitance on the data line could be 800pF when power is first applied. If a 5k

W resistor is used

ms after power has been applied, the parasite capacitance does

not affect normal communications.

ms to allow interrupt

signaling; otherwise, it could mask or conceal interrupt pulses.

Note 8: Guaranteed by design, not production tested.