DS1821

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AC ELECTRICAL CHARACTERISTICS:

PARAMETER

SYMBOL

MIN

TYP

MAX

UNITS

NOTES

Temperature Conversion Time

0.4

1.0

s

Time Slot

60

120

µs

Recovery Time

1µs

Write 0 Low Time

60

120

µs

Write 1 Low Time

115

µs

Read Data Valid

15

µs

Reset Time High

480

µs

Reset Time Low

480

µs

Presence Detect High

15

60

µs

Presence Detect Low

60

240

µs

EEPROM Write Time

10

50

ms

100

ns

6

High

100

ns

Mode Toggle Clock Pulse Low Time

0.1

10

µs

Mode Toggle Clock Pulse High Time

0.1

µs

Mode Toggle Clock High-to-Low or

Low-to-High Transition Time

100

ns

Capacitance

25

pF

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.

5. DQ line in “hi-Z” state and Idq=0.

6. Time for part to disable thermostat output.

7. For T<0

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.