DS1689S-TRL Equivalent & Substitute Parts

Part Overview

The DS1689S-TRL is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality and 114 bytes of NVSRAM, manufactured by Analog Devices Inc./Maxim Integrated. This device operates in dual supply voltage ranges (2.7V–3.3V and 4.5V–5.5V) with battery backup capability (2.5V–3.7V) and is packaged in a 28-SOIC surface mount configuration.

The DS1689S-TRL is classified as obsolete. Equivalent and substitute parts are necessary to maintain system functionality in applications requiring RTC Clock/Calendar capability with parallel interface architecture and comparable electrical specifications.

Substiute Parts

DS1689S-TRL

Analog Devices Inc./Maxim IntegratedIn Stock: 861DS1689S-TRL Datasheet

Current PartRFQ

BQ4802YDWR

Texas InstrumentsIn Stock: 1873BQ4802YDWR Datasheet

MFR RecommendedRFQ

M48T08-100PC1

STMicroelectronicsIn Stock: 1683M48T08-100PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DS1689S-TRL are selected based on the following critical parameters:

• Interface Type: Parallel interface required for direct functional replacement
• Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd format support
• Operating Temperature Range: 0°C–70°C
• Supply Voltage Compatibility: Primary supply and battery backup voltage ranges
• Package Type: Surface mount (28-SOIC) or through-hole (28-DIP) configurations acceptable for system redesign
• Product Status: Active status preferred for long-term availability

Two substitute parts meet these criteria with varying package configurations and feature sets:

BQ4802YDWR (Texas Instruments): Surface mount 28-SOIC package, active product status, RoHS3 compliant, includes additional features (Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer).

M48T08-100PC1 (STMicroelectronics): Through-hole 28-DIP package, active product status, RoHS3 compliant, Timekeeper® series, includes Leap Year and Watchdog Timer features.

Parameter Comparison

Engineering Selection Recommendations

BQ4802YDWR is the preferred direct substitute for applications requiring surface mount packaging and 5V primary supply operation. This part maintains the 28-SOIC form factor with compatible pinout and parallel interface. The BQ4802YDWR is RoHS3 compliant and carries active product status, ensuring long-term availability and supply chain stability. The device supports 12/24-hour time format and includes enhanced features (Alarm, Daylight Savings, Leap Year, Supervisor, Watchdog Timer) not present in the original DS1689S-TRL. Battery backup voltage range (2.4V–4V) is compatible with standard lithium coin cell applications.

M48T08-100PC1 is suitable for applications where through-hole mounting is acceptable or preferred. This STMicroelectronics Timekeeper® series device operates at 4.75V–5.5V primary supply and is RoHS3 compliant with active product status. The 28-DIP package requires PCB redesign but provides robust mechanical connection for high-vibration or high-reliability applications. Time format support is limited to 24-hour operation. Battery backup voltage specification is not provided; verification with the manufacturer is required for applications requiring battery-backed operation.

Both substitutes support the required YY-MM-DD-dd date format and 0°C–70°C operating temperature range. Selection between these options depends on packaging requirements and system voltage architecture.

Frequently Asked Questions (FAQ)

Q: Can BQ4802YDWR directly replace DS1689S-TRL without PCB modification?

A: BQ4802YDWR uses the same 28-SOIC package type as DS1689S-TRL. However, pinout compatibility must be verified against device datasheets before implementation. The 28-SOIC package dimensions differ slightly (0.295" vs. 0.337" width), which may affect PCB footprint fit. Consult manufacturer documentation for pin-to-pin compatibility.

Q: What is the primary difference between BQ4802YDWR and M48T08-100PC1?

A: The primary difference is packaging: BQ4802YDWR is surface mount (28-SOIC), while M48T08-100PC1 is through-hole (28-DIP). BQ4802YDWR supports both 12-hour and 24-hour time formats; M48T08-100PC1 supports 24-hour format only. Both devices maintain parallel interface architecture and YY-MM-DD-dd date format.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both BQ4802YDWR and M48T08-100PC1 are RoHS3 compliant. The original DS1689S-TRL is RoHS non-compliant. Selection of either substitute improves environmental compliance for new designs or redesigned systems.

Q: What supply voltage range should I use for substitution?

A: BQ4802YDWR operates at 4.5V–5.5V primary supply only (no dual-voltage support like DS1689S-TRL). M48T08-100PC1 operates at 4.75V–5.5V. Both devices are optimized for 5V systems. If your application requires 3.3V operation, neither substitute is suitable without additional voltage regulation circuitry.

Q: Is battery backup supported on both substitutes?

A: BQ4802YDWR supports battery backup at 2.4V–4V, compatible with standard lithium coin cells. M48T08-100PC1 does not specify battery backup voltage; contact the manufacturer for clarification if battery-backed operation is required.

Q: What is the timekeeping current consumption difference?

A: DS1689S-TRL draws 3mA @ 5V. BQ4802YDWR draws 1.5mA (typical) @ 4.5V–5.5V, representing lower power consumption. M48T08-100PC1 draws 3mA @ 4.7V–5.5V, matching the original specification. Lower current consumption in BQ4802YDWR may extend battery backup runtime in applications with limited power budgets.