DS1977

2 of 29

PHYSICAL SPECIFICATION

Size

See mechanical drawing

Weight DS1977

Ca. 3.3g

ABSOLUTE MAXIMUM RATINGS

I/O Voltage to GND

-0.3V, +5.5V

I/O Sink Current

20mA

Junction Temperature

+150°C

Storage Temperature Range

-40°C to +85°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.

ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

I/O Pin General Data

1-Wire Pullup

Resistance

(Notes 1, 2)

0.6

2.2

k



Input Capacitance

(Note 3)

5

nF

Input Load Current

1

10

µA

High-to-Low Switching

Threshold

(Notes 4, 5)

0.5

3.2

V

Input Low Voltage

(Notes 1, 6)

0.30

V

Low-to-High Switching

Threshold

(Notes 4, 7)

0.7

3.4

V

Switching Hysteresis

(Note 8)

0.15

N/A

V

Output-Low Voltage at

4mA

(Note 9)

0.4

V

(Note 1)

5

(Note 1)

2

Recovery Time

Overdrive speed, directly prior

(Note 1)

5

µs

Standard speed (Note 10)

0.5

5

Rising-Edge Hold-off

Time

Overdrive speed (Note 10)

0.5

2

µs

Standard speed (Note 1)

65

Timeslot Duration

Overdrive speed (Note 1)

8

µs

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

Standard speed (Note 1)

480

640

Reset Low Time

Overdrive Speed (Note 1)

48

80

µs

Standard speed (Note 11)

15

60

Presence Detect High

Time

Overdrive speed (Note 11)

2.5

6.5

µs

(Note 12)

1.5

5

Standard speed (Note 12)

1.5

8

Presence Detect Fall

Time

Overdrive speed (Note 12)

0.15

1

µs

Standard speed

60

240

Presence Detect Low

Time

Overdrive speed

8

24

µs