DS32kHz

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ABSOLUTE MAXIMUM RATINGS

Voltage Range on Any Pin Relative to Ground………………………………………………………………-3.0V to +7.0V

Operating Temperature Range (Noncondensing)

Commercial:…………………………………………………………………………………………………..0°C to +70°C

Industrial:……………………………………………………………………………………………………-40°C to +85°C

Storage Temperature Range………………………………………………………………………………….-40°C to +85°C

Soldering Temperature (BGA, SO)……………………….See the Handling, PC Board Layout, and Assembly section.

Soldering Temperature, Leads (DIP)……………………………………………………..+260°C for 10 seconds (Note 1)

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 reliability.

RECOMMENDED DC OPERATING CONDITIONS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Power-Supply Voltage

(Note 2)

4.5

5.0

5.5

V

Battery Voltage

(Notes 2, 3)

2.7

3.0

3.5,

5.5

V

DC ELECTRICAL CHARACTERISTICS

(Over the operating range, unless otherwise specified.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Active Supply Current

(Notes 3, 4)

150

220

μA

Battery Input-Leakage Current

-50

+50

nA

2.4

V

Low Output Voltage

0.4

V

2.4

V

Battery Switch Voltage

(Note 2)

V

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Active Battery Current

1

4

μA

Battery Current During

Temperature Measurement

450

μA

Note 1:

Limits at -40°C are guaranteed by design and are not production tested.

Note 2:

All voltages are referenced to ground.

Note 3:

Note 4:

Note 5:

These parameters are measured under no output load conditions.

Note 6:

This current is the active-mode current sourced from the backup supply/battery.

Note 7:

A temperature conversion lasts 122ms (typ) and occurs on power-up and then once every 64 seconds.