DS1689 Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS1689 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality and 114 bytes of NVSRAM, packaged in a 28-DIP through-hole configuration. Manufactured by Analog Devices Inc./Maxim Integrated, this component is classified as obsolete. Due to its discontinued status, identifying functionally compatible substitute parts is essential for system redesign, legacy product support, and component procurement continuity.

Substiute Parts

DS1689

Analog Devices Inc./Maxim IntegratedIn Stock: 1640DS1689 Datasheet

Current PartRFQ

M48T02-70PC1

STMicroelectronicsIn Stock: 1276M48T02-70PC1 Datasheet

MFR RecommendedRFQ

M48T35AV-10PC1

STMicroelectronicsIn Stock: 1390M48T35AV-10PC1 Datasheet

MFR RecommendedRFQ

M48T37V-10MH1F

STMicroelectronicsIn Stock: 1945M48T37V-10MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1689 is determined by the following critical parameters:

• Interface Type: Parallel interface required for direct pin-level compatibility
• Package Configuration: Physical form factor and pin count (28-DIP preferred for through-hole mounting)
• Voltage Supply Range: Compatibility with dual-voltage operation (2.7V ~ 3.3V and 4.5V ~ 5.5V)
• Time/Date Format: Support for 12/24-hour time and YY-MM-DD-dd date format
• Operating Temperature Range: 0°C ~ 70°C minimum requirement
• Mounting Type: Through-hole technology for PCB integration

The substitute parts identified are manufactured by STMicroelectronics under the Timekeeper® series. These components maintain parallel interface architecture and compatible operating temperature ranges. However, substitution requires evaluation of specific package variants and voltage supply configurations, as individual substitute parts may operate within narrower voltage ranges or different package types.

Parameter Comparison

Engineering Selection Recommendations

M48T35AV-10PC1 is the primary substitute for through-hole applications requiring 28-DIP package compatibility. This part maintains identical package dimensions, through-hole mounting technology, and operating temperature range. Voltage supply operates within the 3V ~ 3.6V range, suitable for systems designed around the DS1689's lower voltage specification. RoHS3 compliance provides environmental regulatory advantage over the non-compliant DS1689.

M48T02-70PC1 serves as an alternative for 5V-dominant systems. The 24-DIP package represents a reduced pin count configuration, requiring PCB layout modification. This part is suitable only when system architecture permits package reconfiguration. RoHS3 compliance is maintained.

M48T37V-10MH1F is applicable for new designs or systems undergoing redesign that can accommodate surface-mount technology. The 44-BSOP package offers enhanced integration density and requires SNAPHAT socket accommodation. This part includes additional features (Alarm, Watchdog Timer) beyond the DS1689 baseline functionality. Surface-mount deployment eliminates through-hole PCB constraints but requires manufacturing process adaptation.

All substitute parts maintain parallel interface architecture, YY-MM-DD-dd date format, and 0°C ~ 70°C operating temperature compatibility. Selection depends on voltage supply requirements, package form factor constraints, and manufacturing process capabilities.

Frequently Asked Questions (FAQ)

Q: Can M48T02-70PC1 directly replace DS1689 in existing PCB designs?

A: Direct replacement is not possible. M48T02-70PC1 uses a 24-DIP package versus DS1689's 28-DIP configuration. Pin count reduction requires PCB layout modification and firmware validation to confirm functional compatibility.

Q: What is the primary voltage supply difference between substitute parts?

A: M48T02-70PC1 operates at 4.75V ~ 5.5V (5V systems only). M48T35AV-10PC1 and M48T37V-10MH1F both operate at 3V ~ 3.6V (3V systems). DS1689 supports dual-voltage operation (2.7V ~ 3.3V and 4.5V ~ 5.5V). System voltage architecture determines substitute eligibility.

Q: Are all substitute parts RoHS compliant?

A: Yes. M48T02-70PC1, M48T35AV-10PC1, and M48T37V-10MH1F are all ROHS3 compliant. DS1689 is RoHS non-compliant. Regulatory requirements may mandate substitution regardless of functional compatibility.

Q: What mounting technology differences exist among substitutes?

A: M48T02-70PC1 and M48T35AV-10PC1 are through-hole components compatible with traditional PCB assembly. M48T37V-10MH1F is surface-mount (44-BSOP package), requiring SMT assembly equipment and process modification.

Q: Does M48T37V-10MH1F offer functional advantages over other substitutes?

A: M48T37V-10MH1F includes integrated Alarm, Leap Year, and Watchdog Timer features. DS1689 features NVSRAM. Feature sets differ; selection depends on application requirements beyond basic clock/calendar functionality.

Q: What is the inventory status of substitute parts?

A: M48T02-70PC1: 1235 units. M48T35AV-10PC1: 1322 units. M48T37V-10MH1F: 1912 units. All are listed as active products with current availability.

Q: Can 12-hour time format operation be maintained with substitute parts?

A: Substitute parts support 24-hour time format only. DS1689 supports both 12/24-hour formats. Applications requiring 12-hour operation require firmware adaptation or alternative component selection.