Rainbow-electronics DS1904 Manual de usuario descargar pdf (Pagina 11)

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 (V

PUP

=2.8V to 6.0V; -40°C to +70°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Logic 1 V

2.2 6.0 V 1

Logic 0 V

-0.3 0.8 V 1,5

Output Logic Low @ 4 mA V

0.4 V 1

Output Logic High V

PUP

V 1,2

Input Load Current I

5µA3

CAPACITANCE (t

= 25°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Capacitance 1-Wire C

50 pF

AC ELECTRICAL CHARACTERISTICS (V

PUP

=2.8V to 6.0V; -40°C to +70°C)

PARAMETER SYMBOL MIN TYP MAX UNITS NOTES

Time Slot t

SLOT

60 120 µs

Write 1 Low Time t

LOW1

115µs

Write 0 Low Time t

LOW0

60 120 µs

Read Low Time t

LOWR

115µs

Read Data Valid t

RDV

exactly 15 µs 7

Release Time t

RELEASE

01545µs

Read Data Setup t

1µs 4

Recovery Time t

REC

1µs

Reset High Time t

RSTH

480 µs

Reset Low Time t

RSTL

480 960 µs 6

Presence Detect High t

PDH

15 60 µs

Presence Detect Low t

PDL

60 240 µs

1 2 ... 6 7 8 9 10 11 12

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Rainbow-electronics DS1904 Manual de usuario Pagina 11

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