DS1904

11 of 12

PHYSICAL SPECIFICATION

Size

See mechanical drawing

Weight

3.3 grams

Humidity

90% RH at 50°C

Altitude

10000 feet

Expected Service Life

10 years at 25°C

Safety

Meets UL#913 (4th Edit.); Intrinsically Safe

Apparatus, Approval under Entity Concept for

use in Class I, Division 1, Group A, B, C and

D Locations (application pending)

ABSOLUTE MAXIMUM RATINGS*

Voltage on 1-Wire to Ground

-0.5V to +7.0V

Operating Temperature

-40°C to +70°C

Storage Temperature

-40°C to +70°C

* This is a stress rating only and functional operation of the device at these or any other conditions

above those indicated in the operation sections of this specification is not implied. Exposure to abso-

lute maximum rating conditions for extended periods of time may affect reliability.

DC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Logic 1

2.2

6.0

V

1

Logic 0

-0.3

0.8

V

1,5

Output Logic Low @ 4 mA

0.4

V

1

Output Logic High

V

1,2

Input Load Current

5µA

3

CAPACITANCE

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Capacitance 1-Wire

50

pF

AC ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Time Slot

60

120

µs

Write 1 Low Time

115

µs

Write 0 Low Time

60

120

µs

Read Low Time

115

µs

Read Data Valid

exactly 15

µs

7

Release Time

015

45

µs

Read Data Setup

1µs

4

Recovery Time

1µs

Reset High Time

480

µs

Reset Low Time

480

960

µs

6

Presence Detect High

15

60

µs

Presence Detect Low

60

240

µs