Real Time Clocks

Manufacturer Series Package/Case Packaging Product Status Programmable Type Features Memory Size Time Format Date Format Interface Voltage - Supply Voltage - Supply, Battery Current - Timekeeping (Max) Operating Temperature Mounting Type Grade Qualification Supplier Device Package























































































































































































































































































































































































































































































































































































































































































































































































































































































































































































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Photo Mfr. Part # Availability Price Quantity Datasheet Series Package/Case Packaging Product Status Programmable Type Features Memory Size Time Format Date Format Interface Voltage - Supply Voltage - Supply, Battery Current - Timekeeping (Max) Operating Temperature Mounting Type Grade Qualification Supplier Device Package
DS1306E Analog Devices Inc./Maxim Integrated

DS1306E

IC RTC CLK/CALENDAR SPI 20TSSOP

Analog Devices Inc./Maxim Integrated

3,879
RFQ
DS1306E Datasheet

Datasheet

- 20-TSSOP (0.173", 4.40mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Trickle-Charger 96B HH:MM:SS (12/24 hr) YY-MM-DD-dd SPI 2V ~ 5.5V 2V ~ 5.5V 25.3µA ~ 81µA @ 2V ~ 5V 0°C ~ 70°C Surface Mount - - 20-TSSOP
DS1685S-5 Analog Devices Inc./Maxim Integrated

DS1685S-5

IC RTC CLK/CALENDAR PAR 24SOIC

Analog Devices Inc./Maxim Integrated

2,792
RFQ
DS1685S-5 Datasheet

Datasheet

- 24-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 5V 0°C ~ 70°C Surface Mount - - 24-SOIC
DS12C887A Analog Devices Inc./Maxim Integrated

DS12C887A

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

1,323
RFQ
DS12C887A Datasheet

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 113B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 4V 15mA @ 4.5V ~ 5.5V 0°C ~ 70°C Through Hole - - 24-EDIP
DS1687-3IND Analog Devices Inc./Maxim Integrated

DS1687-3IND

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

1,242
RFQ
DS1687-3IND Datasheet

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 3V -40°C ~ 85°C Through Hole - - 24-EDIP
DS1687-5IND Analog Devices Inc./Maxim Integrated

DS1687-5IND

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

1,239
RFQ
DS1687-5IND Datasheet

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, NVSRAM, Square Wave Output, Y2K 242B HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 3mA @ 5V -40°C ~ 85°C Through Hole - - 24-EDIP
DS17287-3 Analog Devices Inc./Maxim Integrated

DS17287-3

IC RTC CLK/CALENDAR PAR 24EDIP

Analog Devices Inc./Maxim Integrated

1,470
RFQ
DS17287-3 Datasheet

Datasheet

- 24-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output 2KB HH:MM:SS (12/24 hr) YY-MM-DD-dd Parallel 2.7V ~ 3.7V 2.5V ~ 3.7V 2mA @ 2.7V ~ 3.7V 0°C ~ 70°C Through Hole - - 24-EDIP
DS1643AL-120 Analog Devices Inc./Maxim Integrated

DS1643AL-120

IC RTC CLK/CALENDAR PAR 34LPM

Analog Devices Inc./Maxim Integrated

2,634
RFQ
DS1643AL-120 Datasheet

Datasheet

- 34-LPM Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM 8KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V 0°C ~ 70°C Surface Mount - - 34-LPM
DS1744W-120 Analog Devices Inc./Maxim Integrated

DS1744W-120

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

3,759
RFQ
DS1744W-120 Datasheet

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 28-EDIP
DS1744W-120IND Analog Devices Inc./Maxim Integrated

DS1744W-120IND

IC RTC CLK/CALENDAR PAR 28EDIP

Analog Devices Inc./Maxim Integrated

1,894
RFQ
DS1744W-120IND Datasheet

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 32KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V -40°C ~ 85°C Through Hole - - 28-EDIP
DS1244W-120IND Analog Devices Inc./Maxim Integrated

DS1244W-120IND

IC RTC PHANTOM CHIP PAR 28EDIP

Analog Devices Inc./Maxim Integrated

1,194
RFQ
DS1244W-120IND Datasheet

Datasheet

- 28-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 32KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 7mA @ 3.3V -40°C ~ 85°C Through Hole - - 28-EDIP
DS1746W-120 Analog Devices Inc./Maxim Integrated

DS1746W-120

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

3,288
RFQ
DS1746W-120 Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 128KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1248Y-100IND Analog Devices Inc./Maxim Integrated

DS1248Y-100IND

IC RTC PHANTOM CHIP PAR 32EDIP

Analog Devices Inc./Maxim Integrated

3,860
RFQ
DS1248Y-100IND Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Phantom Time Chip NVSRAM 128KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 7mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1747-70 Analog Devices Inc./Maxim Integrated

DS1747-70

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

4,436
RFQ
DS1747-70 Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1747W-120 Analog Devices Inc./Maxim Integrated

DS1747W-120

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

1,599
RFQ
DS1747W-120 Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1251W-120 Analog Devices Inc./Maxim Integrated

DS1251W-120

IC RTC PHANTOM CHIP PAR 32EDIP

Analog Devices Inc./Maxim Integrated

1,690
RFQ
DS1251W-120 Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 7mA @ 3.3V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1251Y-70 Analog Devices Inc./Maxim Integrated

DS1251Y-70

IC RTC PHANTOM CHIP PAR 32EDIP

Analog Devices Inc./Maxim Integrated

2,651
RFQ
DS1251Y-70 Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 10mA @ 5V 0°C ~ 70°C Through Hole - - 32-EDIP
DS1747-70IND Analog Devices Inc./Maxim Integrated

DS1747-70IND

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

3,188
RFQ
DS1747-70IND Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V - 4mA @ 5V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1747W-120IND Analog Devices Inc./Maxim Integrated

DS1747W-120IND

IC RTC CLK/CALENDAR PAR 32EDIP

Analog Devices Inc./Maxim Integrated

2,985
RFQ
DS1747W-120IND Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Clock/Calendar Leap Year, NVSRAM, Y2K 512KB HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 2mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1251W-120IND Analog Devices Inc./Maxim Integrated

DS1251W-120IND

IC RTC PHANTOM CHIP PAR 32EDIP

Analog Devices Inc./Maxim Integrated

4,364
RFQ
DS1251W-120IND Datasheet

Datasheet

- 32-DIP Module (0.600", 15.24mm) Tube Obsolete Not Verified Phantom Time Chip Leap Year, NVSRAM 512KB HH:MM:SS:hh (12/24 hr) YY-MM-DD-dd Parallel 2.97V ~ 3.63V - 7mA @ 3.3V -40°C ~ 85°C Through Hole - - 32-EDIP
DS1501YSN Analog Devices Inc./Maxim Integrated

DS1501YSN

IC RTC CLK/CALENDAR PAR 28SOIC

Analog Devices Inc./Maxim Integrated

3,866
RFQ
DS1501YSN Datasheet

Datasheet

- 28-SOIC (0.295", 7.50mm Width) Tube Obsolete Not Verified Clock/Calendar Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K 256B HH:MM:SS (24 hr) YY-MM-DD-dd Parallel 4.5V ~ 5.5V 2.5V ~ 3.7V 5mA @ 4.5V ~ 5.5V -40°C ~ 85°C Surface Mount - - 28-SOIC
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Real Time Clocks Electronic Components Sourcing and Lifecycle Support

FPGAX is a global sourcing partner specializing in FPGA and programmable logic solutions for engineering and manufacturing organizations worldwide. For customers sourcing Real Time Clocks components, we support both current production requirements and long-term component availability across demanding product lifecycles.

Our sourcing approach combines traceability, supply stability, and technical coordination. FPGAX is certified to AS9120B, ISO 9001:2008, and ISO 14001 standards and supports procurement programs where continuity, documentation, and dependable component supply are important.

How FPGAX Supports Real Time Clocks Requirements

  • Active component sourcing: support for current FPGA, programmable logic, and related semiconductor requirements.
  • End-of-life sourcing: assistance with obsolete and hard-to-find parts when designs must remain in production.
  • Lifecycle management: sourcing support during product transitions, allocation periods, and supply interruptions.
  • Design continuity: long-term supply support intended to reduce redesign pressure and production disruption.
  • Major programmable logic brands: sourcing coverage includes Xilinx, Intel/Altera, Lattice, Microchip, and QuickLogic.

Supply Support at a Glance

Requirement FPGAX Support
Current production Active FPGA, programmable logic, and semiconductor component sourcing
Legacy programs End-of-life and hard-to-find component sourcing
Supply continuity Lifecycle transition and long-term availability support
Quality requirements Traceable sourcing and quality-management processes

Focused on FPGA and Programmable Logic Supply

FPGAX focuses on helping customers maintain access to critical programmable devices throughout the full component lifecycle. Whether the requirement is for a current design, an established production program, or an older platform facing component obsolescence, our goal is to provide a stable sourcing path and help customers maintain design and manufacturing continuity.

Real Time Clocks FAQ

Can FPGAX source both active and end-of-life Real Time Clocks components?

Yes. FPGAX supports sourcing for both active components and end-of-life or hard-to-find parts, with an emphasis on maintaining supply continuity for engineering and manufacturing programs.

Which programmable logic manufacturers does FPGAX support?

Our core sourcing coverage includes major FPGA and programmable logic manufacturers such as Xilinx, Intel/Altera, Lattice, Microchip, and QuickLogic, subject to specific part requirements and availability.

How does FPGAX help with component lifecycle changes?

We support customers through lifecycle transitions by helping locate current or legacy supply, reducing exposure to supply disruptions, and supporting long-term availability for designs that need to remain in production.

What quality and traceability standards does FPGAX follow?

FPGAX states certification to AS9120B, ISO 9001:2008, and ISO 14001 standards. Our sourcing services are structured around traceability, stable supply, and quality-management requirements.

What information should I provide for a Real Time Clocks sourcing request?

Providing the manufacturer part number, required quantity, target delivery schedule, and any lifecycle or traceability requirements helps us evaluate the sourcing request more efficiently.