IO Voltage to GND ..................................................-0.3V to +6V

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

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

Junction Temperature......................................................+150°C

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

DS1925

iButton High-Capacity Temperature Logger

with 122KB Data-Log Memory

www.maximintegrated.com

Maxim Integrated │ 2

Absolute Maximum Ratings

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.

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

Electrical Characteristics

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Temperature

(Note 1)

-40

+85

°C

IO PIN: GENERAL DATA

1-Wire Pullup Resistance

(Notes 2, 3)

2200

Ω

Input Capacitance

(Note 4)

120

nF

Input Leakage Current

6

60

µA

High-to-Low Switching

Threshold

(Notes 5, 6)

0.5 x

V

Input Low Voltage

(Notes 2, 7)

0.4

V

Low-to-High Switching

Threshold

(Notes 5, 8)

0.75 x

V

Switching Hysteresis

(Note 9)

0.2 x

V

Output Low Voltage

At 4mA (Note 10)

0.4

V

Recovery Time

(Note 2)

5

µs

2

Overdrive speed, directly prior to reset

5

Time Slot Duration (Note 2)

Standard speed

65

µs

Overdrive speed

8

Rising-Edge Hold-Off Time

(Note 11)

0.1

µs

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

Reset Low Time (Note 2)

480

640

µs

Overdrive speed

48

80

Presence-Detect Sample

Time (Note 2)

Standard speed

65

75

µs

Overdrive speed

8

10