Medical: Cardiac Monitor


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Real-Time Clock (RTC)

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Title / Parts

Key Advantages

QV PDF

I²C, 32-Bit, Binary Counter Clock with 64-Bit ID
DS1372

Ideal Clock for Portable Media Players

QV PDF

Accurate I²C RTC with Integrated TCXO/Crystal/FRAM
DS32B35, DS32C35

Nonvolatile Memory Has No Backup Supply and No Write Cycle Limits

QV PDF

I²C RTC with Trickle Charger
DS1340, DS1340C

I²C Real-Time Clock with Trickle Charger Offers Software Clock Calibration

QV PDF

I²C Serial Real-Time Clock
DS1339, DS1339C, DS1339U

RTC Provides System Flexibility with Multiple Programmable Features

Key Specifications: Oscillator Modules

Part Number

Frequency

Oscillator Type

Tuning Adjustment Type

Frequency Output Type

Freq. Stability vs. Temp. @0 to +40°C (±ppm)

Freq. Stab. vs.Temp. @-40 to 0/ +40 to 85°C (±ppm)

Frequency Stability vs. Supply Voltage (±ppm/V)

Frequency Stability vs. Aging (±ppm)

Supply Voltage (V)

Battery Voltage (V)

Operating Temp. Range (°C)

DS32B35

32.768kHz

TCXO

Digital

CMOS Open-Drain

3.5

1 (typ)

5 (0-10 Years)

2.7 to 3.63
3.3

2.3 to 3.6

-40 to +85
0 to +70

DS32C35

32.768kHz

TCXO

Digital

CMOS Open-Drain

3.5

1 (typ)

5 (0-10 Years)

2.7 to 3.63
3.3

2.3 to 3.6

-40 to +85
0 to +70

See All Oscillator Modules (26)

Key Specifications: Timekeeping & Real-Time Clocks

Part Number

Functions

Time Format (hh = sec/100)

Date Format

Interface

Supply Voltage (V)

Time- keeping Current (typ) (nA)

C_L, Load Capacitance (pF)

Memory Type

Memory Size (Bytes)

Number of Time of Day Alarms

Features

Operating Temp. Range (°C)

DS32B35

HH:MM:SS

YY-MM-DD

I²C

2.7 to 3.63
3.3

840

FRAM

2k
8k

•

µP Reset

•	Power Fail Output

•	SOIC Package with Integrated Crystal

•	Square-Wave Output

-40 to +85
0 to +70

DS32C35

HH:MM:SS

YY-MM-DD

I²C

2.7 to 3.63
3.3

840

FRAM

2k
8k

•

µP Reset

•	Power Fail Output

•	SOIC Package with Integrated Crystal

•	Square-Wave Output

-40 to +85
0 to +70

DS1339

HH:MM:SS

YY-MM-DD

I²C

2
3
3.3
5

400

None

•	SOIC Package with Integrated Crystal

•	Square-Wave Output

•	Trickle Charger

-40 to +85

DS1340

HH:MM:SS

YY-MM-DD

I²C

1.8
3
3.3
5

800

12.5

None

•	SOIC Package with Integrated Crystal

•	Square-Wave Output

•	Trickle Charger

-40 to +85

DS1372

•	Elapsed Time Counter

Binary

I²C

3
3.3
5

400

12.5

None

•	Serial Number

•	Square-Wave Output

-40 to +85

See All Timekeeping & Real-Time Clocks (86)