DS1922L/DS1922T

2 of 48

ABSOLUTE MAXIMUM RATINGS

I/O Voltage to GND

-0.3V, +6V

I/O Sink Current

20mA

Operating Temperature Range (DS1922L)

-40°C to +85°C

Operating Temperature Range (DS1922T)

0°C to +125°C

Junction Temperature

+150°C

Storage Temperature Range (DS1922L)

-40°C to +85°C*

Storage Temperature Range (DS1922T)

0°C to +125°C*

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

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

ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

I/O Pin General Data

1-Wire Pullup Resistance

(Notes 1, 2)

2.2

k

W

Input Capacitance

(Note 3)

100

800

pF

Input Load Current

610

µA

High-to-Low Switching

Threshold

(Notes 4, 5)

0.4

3.2

V

Input Low Voltage

(Notes 1, 6)

0.3

V

Low-to-High Switching

Threshold

(Notes 4, 7)

0.7

3.4

V

Switching Hysteresis

(Note 8)

0.09

N/A

V

Output Low Voltage

At 4mA (Note 9)

0.4

V

W

5

W

2

Recovery Time (Note 1)

Overdrive speed, directly prior to reset

W

5

µs

Rising-Edge Hold-Off Time

(Note 10)

0.6

2.0

µs

Standard speed

65

8

Timeslot Duration (Note 1)

Overdrive speed (Note 11)

9.5

µs

I/O Pin, 1-Wire Reset, Presence Detect Cycle

480

720

Standard speed (Note 11)

690

720

48

80

Reset Low Time (Note 1)

Overdrive speed (Note 11)

70

80

µs

15

60

Standard speed (Note 11)

15

63.5

Presence Detect High

Time

Overdrive speed (Note 11)

2

7

µs

1.5

5

Standard speed

1.5

8

Presence Detect Fall Time

(Note 12)

Overdrive speed

0.15

1

µs

60

240

Standard speed (Note 11)

60

287

724

Presence Detect Low

Time

Overdrive speed (Note 11)

7

28

µs

65

75

Standard speed

71.5

75

Presence Detect Sample

Time (Note 1)

Overdrive speed

8

9

µs

I/O Pin, 1-Wire Write

Standard speed

60

120

6

12

Write-0 Low Time (Note 1)

Overdrive speed (Note 11)

7.5

12

µs

Standard speed

5

15 -

e

Write-1 Low Time

(Notes 1, 13)

Overdrive speed

1

1.95 -

e

µs