DS2411

3 of 11

PARAMETER

SYMBOL

CONDITIONS

MIN

MAX UNITS

I/O PIN, 1-Wire RESET, PRESENCE DETECT CYCLE

Standard speed

480

640

Reset Low Time

Overdrive speed

60

80

µs

Standard speed

15

60

2

6

Presence-Detect High Time

2

8.5

µs

Standard speed

60

240

8

24

Presence-Detect Low Time

8

30

µs

Standard speed (Note 10, 3)

0.4

8

Presence-Detect Fall Time

Overdrive speed (Note 10, 3)

0.05

1

µs

Standard speed (Note 1)

60

75

6

10

Presence-Detect Sample

Time

8.5

10

µs

I/O PIN, 1-Wire WRITE

Standard speed (Notes 1, 13)

60

120

13)

616

Write-0 Low Time

13)

816

µs

Standard speed (Notes 1, 11, 13)

5

15 -

e

Write-1 Low Time

Overdrive speed (Notes 1, 11, 13)

1

2 -

e

µs

I/O PIN, 1-Wire READ

Standard speed (Notes 1, 11)

5

15 -

e

Read Low Time

Overdrive speed (Notes 1, 11)

1

2 -

e

µs

Standard speed (Notes 1, 12)

d

15

Read Sample Time

Overdrive speed (Notes 1, 12)

d

2

µs

Note 1:

System requirement.

Note 2:

Maximum allowable pullup resistance is a function of the number of 1-Wire devices in the

system and 1-Wire recovery times. The specified value here applies to systems with only

one device and with the minimum 1-Wire recovery times. For more heavily loaded

systems, an active pullup such as that found in the DS2480B may be required. Minimum

allowable pullup resistance is slightly greater than the value necessary to produce the

Note 3:

Not production tested.

Note 4:

Note 5:

Voltage below which during a falling edge on I/O, a logic ‘0’ is detected.

Note 6:

Voltage above which during a rising edge on I/O, a logic ‘1’ is detected.

Note 7:

be detected as logic ‘0’.

Note 8:

The I-V characteristic is linear for voltages less than 1V.

Note 9:

on the previous edge.

Note 10:

Interval during the negative edge on I/O at the beginning of a presence-detect pulse