DS14285S/T&R Real Time Clock IC Equivalent & Substitute Parts

Part Overview

The DS14285S/T&R is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This device features 114B of NVSRAM, parallel interface, and comprehensive timekeeping capabilities including alarm, daylight savings, leap year, and square wave output functions. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

DS14285S/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 818DS14285S/T&R Datasheet

Current PartRFQ

DS1685S-5+

Analog Devices Inc./Maxim IntegratedIn Stock: 1030DS1685S-5+ Datasheet

MFR RecommendedRFQ

BQ4802LYPW

Texas InstrumentsIn Stock: 9564BQ4802LYPW Datasheet

MFR RecommendedRFQ

M48T201V-85MH1F

STMicroelectronicsIn Stock: 1609M48T201V-85MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS14285S/T&R is determined by the following critical parameters:

Primary Compatibility Criteria:

• Interface type: Parallel
• Time format support: HH:MM:SS (12/24 hr)
• Date format support: YY-MM-DD-dd
• Operating temperature range: 0°C ~ 70°C
• Core RTC functionality: Clock/Calendar with alarm capability

Secondary Considerations:

• Package compatibility (pin count and footprint)
• Supply voltage ranges (main and battery)
• Memory capacity (minimum 114B)
• Feature set alignment (NVSRAM, square wave output)

The three substitute parts listed below meet the primary compatibility criteria but differ in packaging, memory capacity, and certain feature implementations. These differences require evaluation based on specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

DS1685S-5+ (Recommended Primary Substitute)

The DS1685S-5+ is the manufacturer-recommended substitute from Analog Devices Inc./Maxim Integrated. It maintains identical package geometry (24-SOIC), parallel interface, and time/date format compatibility with the DS14285S/T&R. The DS1685S-5+ is active product status with ROHS3 compliance. Memory capacity increases to 242B, providing additional storage capability. Supply voltage ranges remain compatible (4.5V ~ 5.5V main, 2.5V ~ 3.7V battery). This substitute requires no PCB layout modifications and represents the most direct replacement path.

BQ4802LYPW (Alternative Substitute - Different Package)

The BQ4802LYPW from Texas Instruments provides parallel interface RTC functionality with active product status and ROHS3 compliance. This device operates at lower supply voltages (2.7V ~ 3.6V main, 2.4V ~ 4V battery) compared to the original part. The 28-TSSOP package differs from the original 24-SOIC, requiring PCB layout redesign. The BQ4802LYPW includes supervisor and watchdog timer features not present in the DS14285S/T&R. This substitute is suitable for new designs with lower voltage requirements and available board space for package accommodation.

M48T201V-85MH1F (Alternative Substitute - Larger Package)

The M48T201V-85MH1F from STMicroelectronics (Timekeeper® series) offers parallel interface RTC functionality with active product status and ROHS3 compliance. This device operates at 3V ~ 3.6V supply voltage with fixed 3V battery supply. The 44-BSOP package is significantly larger than the original 24-SOIC, requiring substantial PCB layout modification and SNAPHAT socket accommodation. The M48T201V-85MH1F supports 24-hour time format only (not 12/24 hr selectable). This substitute is appropriate for applications with available board space and 24-hour time format requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1685S-5+ directly replace DS14285S/T&R without PCB modifications?

A: Yes. The DS1685S-5+ maintains identical 24-SOIC package geometry and pin compatibility. No PCB layout changes are required. Firmware may require updates to accommodate the increased 242B memory capacity and Y2K feature set.

Q: What are the key differences between DS14285S/T&R and BQ4802LYPW?

A: The BQ4802LYPW uses a different package (28-TSSOP vs. 24-SOIC), operates at lower supply voltages (2.7V ~ 3.6V vs. 4.5V ~ 5.5V), and includes supervisor and watchdog timer functions. PCB redesign is required for this substitution.

Q: Is the M48T201V-85MH1F suitable for 12-hour time format applications?

A: No. The M48T201V-85MH1F supports 24-hour time format only. Applications requiring 12/24-hour selectable format should use DS1685S-5+ or BQ4802LYPW.

Q: What is the impact of RoHS compliance differences?

A: The DS14285S/T&R is RoHS non-compliant, while all three substitutes are ROHS3 compliant. For applications subject to RoHS regulations, any of the three substitutes satisfy compliance requirements.

Q: Does increased memory in DS1685S-5+ affect compatibility?

A: The DS1685S-5+ provides 242B memory versus 114B in the original part. This is backward compatible; applications using less than 114B of memory will function identically. Applications may utilize the additional 128B of memory for enhanced functionality.

Q: What packaging considerations apply to M48T201V-85MH1F?

A: The M48T201V-85MH1F requires SNAPHAT socket accommodation and occupies significantly more board space (44-BSOP vs. 24-SOIC). This substitution is practical only in applications with available PCB real estate.

Q: Are battery supply voltage ranges compatible across all substitutes?

A: Battery voltage ranges differ: DS14285S/T&R (2.5V ~ 3.6V), DS1685S-5+ (2.5V ~ 3.7V), BQ4802LYPW (2.4V ~ 4V), and M48T201V-85MH1F (3V fixed). Verify battery supply design compatibility before substitution.