DS1821 datasheet(14/16 Pages) DALLAS

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DS1821

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AC ELECTRICAL CHARACTERISTICS:

(-55°C to +125°C; VDD=3.6V to 5.5V)

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Temperature Conversion Time

tCONV

0.4

1.0

Time Slot

tSLOT

120

µs

Recovery Time

tREC

1µs

Write 0 Low Time

tLOW0

120

µs

Write 1 Low Time

tLOW1

115

µs

Read Data Valid

tRDV

µs

Reset Time High

tRSTH

480

µs

Reset Time Low

tRSTL

480

µs

Presence Detect High

tPDHIGH

µs

Presence Detect Low

tPDLOW

240

µs

EEPROM Write Time

tWR

VDD Low to Mode Toggle Clock Low

tPC

100

Mode Toggle Clock 16 High to VDD

High

tCP

100

Mode Toggle Clock Pulse Low Time

tCL

0.1

µs

Mode Toggle Clock Pulse High Time

tCH

0.1

µs

Mode Toggle Clock High-to-Low or

Low-to-High Transition Time

100

Capacitance

CIN/OUT

NOTES:

1. All voltages are referenced to ground.

2. Logic 1 voltages are specified at a source current of 1 mA.

3. Logic 0 voltages are specified at a sink current of 4 mA.

4. IDD specified with VCC at 5.0V.

5. DQ line in “hi-Z” state and Idq=0.

6. Time for part to disable thermostat output.

7. For T<0

°C, accuracy degrades by 0.5°C/V for VCC <4.3V.

8. See typical curve for specification limits outside the 0

°C to +85°C range. Thermometer error reflects

sensor accuracy as tested during calibration.

9. Standby current is specified up to 85

°C. Standby current is typically 5 uA at 125°C.

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