Thermochron iButton

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IO Voltage Range Relative to GND ..........................-0.5V to +6V

IO Sink Current....................................................................20mA

Operating Temperature Range ..........................-40°C to +85°C*

Storage Temperature Range..............................-40°C to +50°C*

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

IO PIN: GENERAL DATA

1-Wire Pullup Resistance

(Notes 1, 2)

2.2

k

Input Capacitance

(Notes 3, 4)

100

800

pF

Input Load Current

10

µA

1.14

2.70

High-to-Low Switching Threshold

(Notes 4, 6, 7, 8)

0.71

2.70

V

Input Low Voltage

(Notes 1, 6, 9)

0.30

V

1.00

2.70

Low-to-High Switching Threshold

(Notes 4, 6, 7, 10)

0.66

2.70

V

Output Low Voltage at 4mA

(Notes 6, 11)

0.4

V

5

2

Recovery Time (Notes 1, 4)

Overdrive speed, directly prior to reset

5

µs

Standard speed

65

Time-Slot Duration (Notes 1, 12)

Overdrive speed

8

µs

IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE

480

640

Standard speed

540

640

48

80

Reset Low Time (Notes 1,12)

Overdrive speed

58

80

µs

Standard speed

15

60

Presence-Detect High

Time (Note 12)

Overdrive speed

1.1

6

µs

Standard speed

60

270

7.5

24

Presence-Detect Low

Time (Note 12)

Overdrive speed

7.5

32

µs

Standard speed

60

75

Presence-Detect

Sample Time (Notes 1, 4)

Overdrive speed

6

8.6

µs

*

Storage or operation above +50°C significantly reduces battery life.