DS1689SN/T&R Equivalent & Substitute Parts

Part Overview

The DS1689SN/T&R 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 across dual voltage ranges (2.7V–3.3V and 4.5V–5.5V) with parallel interface connectivity and is packaged in a 28-SOIC form factor. The product is currently classified as obsolete, necessitating identification of active equivalent and substitute components for new designs or legacy system replacements.

Substiute Parts

DS1689SN/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 1222DS1689SN/T&R Datasheet

Current PartRFQ

BQ4802LYDWR

Texas InstrumentsIn Stock: 3828BQ4802LYDWR Datasheet

MFR RecommendedRFQ

DP8573AVX/NOPB

National SemiconductorIn Stock: 1484DP8573AVX/NOPB Datasheet

MFR RecommendedRFQ

M48T201Y-70MH1F

STMicroelectronicsIn Stock: 2083M48T201Y-70MH1F Datasheet

MFR RecommendedRFQ

M48T37V-10MH1F

STMicroelectronicsIn Stock: 1945M48T37V-10MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1689SN/T&R is determined by the following critical parameters:

• Interface Type: Parallel interface requirement
• Time/Date Format: HH:MM:SS (12/24 hr) and YY-MM-DD-dd format support
• Voltage Supply Ranges: Compatibility with 2.7V–3.3V and/or 4.5V–5.5V operation
• Package Form Factor: 28-SOIC or equivalent surface-mount package
• Operating Temperature Range: Support for -40°C to 85°C or subset thereof
• RTC Functionality: Clock/Calendar with timekeeping capability

The substitute parts identified below maintain parallel interface architecture and clock/calendar functionality. However, variations exist in package dimensions, voltage ranges, temperature ratings, and additional integrated features (alarm, watchdog timer, supervisor functions). Selection must account for specific system voltage requirements and thermal operating conditions.

Parameter Comparison

Engineering Selection Recommendations

BQ4802LYDWR (Texas Instruments): This substitute maintains 28-SOIC packaging with reduced physical dimensions (0.295" vs. 0.337" width) and operates in the 2.7V–3.6V range. Product status is active with ROHS3 compliance. Operating temperature is limited to 0°C–70°C, which does not cover the full -40°C to 85°C range of the original part. This device is suitable for applications operating within the restricted temperature window and lower voltage supply range.

DP8573AVX/NOPB (National Semiconductor): This substitute operates exclusively in the 4.5V–5.5V supply range and maintains the parallel interface with YY-MM-DD-dd date format. Package form factor is 28-LCC (J-Lead), differing from the original 28-SOIC. Operating temperature range matches the original (-40°C to 85°C). This device is appropriate for 5V-only systems with extended temperature requirements but requires PCB layout accommodation for the different package geometry.

M48T201Y-70MH1F (STMicroelectronics): This substitute operates in the 4.5V–5.5V range with 44-BSOP packaging (larger than the original 28-SOIC). Product status is active with ROHS3 compliance. Operating temperature is limited to 0°C–70°C. This device includes additional features (alarm, square wave output, supervisor, watchdog timer, Y2K support) but requires board redesign due to package size increase and does not support the full temperature range.

M48T37V-10MH1F (STMicroelectronics): This substitute operates in the 3V–3.6V range with 44-BSOP packaging. Product status is active with ROHS3 compliance. Operating temperature is limited to 0°C–70°C. This device includes alarm and watchdog timer features but requires board redesign due to package size increase and does not support the full temperature range or 5V operation.

Frequently Asked Questions (FAQ)

Q: Can BQ4802LYDWR replace DS1689SN/T&R in all applications?

A: BQ4802LYDWR maintains parallel interface and clock/calendar functionality with compatible time/date formats. However, it operates only at 0°C–70°C, which excludes applications requiring -40°C operation. Voltage supply is limited to 2.7V–3.6V, excluding 4.5V–5.5V operation. Substitution is valid only for systems operating within these restricted ranges.

Q: What are the package compatibility considerations?

A: DS1689SN/T&R uses 28-SOIC (0.337", 8.56mm width). BQ4802LYDWR uses 28-SOIC (0.295", 7.50mm width)—physically smaller but pin-compatible. DP8573AVX/NOPB uses 28-LCC (J-Lead), requiring different PCB footprint. M48T201Y-70MH1F and M48T37V-10MH1F use 44-BSOP packaging, requiring significant board redesign. Package selection depends on available PCB real estate and manufacturing capabilities.

Q: Which substitute supports the full -40°C to 85°C temperature range?

A: DP8573AVX/NOPB is the only substitute supporting the complete -40°C to 85°C operating temperature range. However, it operates exclusively at 4.5V–5.5V and uses 28-LCC packaging. All other substitutes are limited to 0°C–70°C operation.

Q: Are there voltage supply compatibility issues?

A: DS1689SN/T&R supports dual ranges: 2.7V–3.3V and 4.5V–5.5V. BQ4802LYDWR supports 2.7V–3.6V only. DP8573AVX/NOPB supports 4.5V–5.5V only. M48T201Y-70MH1F supports 4.5V–5.5V only. M48T37V-10MH1F supports 3V–3.6V only. System voltage requirements must be matched to substitute device specifications.

Q: What is the significance of RoHS compliance status?

A: DS1689SN/T&R is RoHS non-compliant. BQ4802LYDWR, M48T201Y-70MH1F, and M48T37V-10MH1F are ROHS3 compliant. For new designs or systems subject to RoHS regulations, compliant substitutes are required. Legacy systems may continue using non-compliant components.

Q: How do additional features affect substitution decisions?

A: BQ4802LYDWR adds alarm, daylight savings, leap year, supervisor, and watchdog timer functions. M48T201Y-70MH1F adds alarm, square wave output, supervisor, watchdog timer, and Y2K support. M48T37V-10MH1F adds alarm and watchdog timer. These features do not prevent substitution but may require firmware or circuit modifications to utilize or disable them appropriately.

Q: What is the MSL (Moisture Sensitivity Level) consideration?

A: DS1689SN/T&R has MSL 1 (unlimited shelf life). BQ4802LYDWR has MSL 1 (unlimited shelf life). M48T201Y-70MH1F and M48T37V-10MH1F have MSL 3 (168-hour limit after moisture exposure). MSL 3 devices require controlled storage and handling procedures to prevent moisture absorption prior to soldering.