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Maxim > Solutions > Printers and Faxes

Real-Time Clocks

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Title / Parts

Key Advantages

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

Low-Voltage SPI/3-Wire RTCs with Trickle Charger
DS1390, DS1391, DS1392, DS1393

Low-Voltage SPI™/3-Wire RTCs with Trickle Charger have the Broadest Feature Set and the Smallest Footprint in Their Class

QV PDF

RTC with Constant-Voltage Trickle Charger
DS12CR887, DS12R885, DS12R887

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
DS1337, DS1337C

Industry's Smallest I²C RTC with Two Time-of-Day Alarms

QV PDF

Portable System Controller
DS1677

QV PDF

Portable System Controller
DS1673

QV PDF

Portable System Controller
DS1670

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)

Package

Smallest Available Package (max w/pins) (mm²)

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

SOIC/20

-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

SOIC/20

-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

Package

Smallest Available Package (max w/pins) (mm²)

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

SOIC/20

-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

SOIC/20

-40 to +85
0 to +70

DS1390

HH:MM:SS:hh

YY-MM-DD

SPI

1.8
3
3.3
5

500

None

•	Square-Wave Output

•	Trickle Charger

uSOP/10

-40 to +85

DS1391

HH:MM:SS:hh

YY-MM-DD

SPI

1.8
3
3.3
5

500

None

•

µP Reset

•	Power Fail Output

•	Trickle Charger

uSOP/10

-40 to +85

DS1392

HH:MM:SS:hh

YY-MM-DD

3-Wire

1.8
3
3.3
5

500

None

•	Square-Wave Output

•	Trickle Charger

uSOP/10

-40 to +85

DS1393

HH:MM:SS:hh

YY-MM-DD

3-Wire

1.8
3
3.3
5

500

None

•

µP Reset

•	Power Fail Output

•	Trickle Charger

uSOP/10

-40 to +85

DS12CR887

HH:MM:SS

YY-MM-DD

Multiplexed

3.3
5

NV SRAM

114

•	Battery + Crystal

•	Periodic Interrupt

•	Square-Wave Output

MOD/24

640

-40 to +85

DS12R885

HH:MM:SS

YY-MM-DD

Multiplexed

3.3
5

800

12.5

NV SRAM

114

•	Periodic Interrupt

•	Square-Wave Output

SOIC/24

118

-40 to +85

DS12R887

HH:MM:SS

YY-MM-DD

Multiplexed

3.3
5

NV SRAM

114

•	Battery + Crystal

•	Periodic Interrupt

•	Square-Wave Output

BGA/48

181

-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

SOIC/16
SOIC/8
uSOP/8

-40 to +85

DS1337

HH:MM:SS

YY-MM-DD

I²C

2
3
3.3
5

425

None

•	SOIC Package with Integrated Crystal

•	Square-Wave Output

PDIP/8
SOIC/16
SOIC/8
uSOP/8

DS1670

•	NV SRAM Control

•	Watchdog Timekeeper

HH:MM:SS

YY-MM-DD

3-Wire

3.3

300

None

•

µP Reset

•	A to D Converter

•	Periodic Interrupt

•	Power Fail Output

SOIC/20
TSSOP/20

0 to +70

DS1673

•	NV SRAM Control

•	Watchdog Timekeeper

HH:MM:SS

YY-MM-DD

3-Wire

3
5

300

None

•

µP Reset

•	A to D Converter

•	Periodic Interrupt

•	Power Fail Output

SOIC/20
TSSOP/20

0 to +70

DS1677

•	NV SRAM Control

•	Watchdog Timekeeper

HH:MM:SS

YY-MM-DD

3-Wire

300

None

•

µP Reset

•	A to D Converter

•	Periodic Interrupt

•	Power Fail Output

TSSOP/20

0 to +70

See All Timekeeping & Real-Time Clocks (86)