DS1693 Equivalent & Substitute Parts Reference

Part Overview

The DS1693 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 parallel interface mode with dual supply voltage ranges (2.7V–3.3V and 4.5V–5.5V) and includes battery backup capability. The DS1693 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system support where original components are no longer readily available or production has ceased.

Substiute Parts

DS1693

Analog Devices Inc./Maxim IntegratedIn Stock: 2297DS1693 Datasheet

Current PartRFQ

BQ4802LYDWR

Texas InstrumentsIn Stock: 3828BQ4802LYDWR Datasheet

MFR RecommendedRFQ

M48T58-70PC1

STMicroelectronicsIn Stock: 1546M48T58-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS1693 is determined by the following critical parameters:

Interface Compatibility: The DS1693 uses a parallel interface; substitute parts must support parallel communication to maintain firmware and PCB layout compatibility.

Time and Date Format: Both the DS1693 and substitute parts must support HH:MM:SS (12/24 hr) time format and YY-MM-DD-dd date format to ensure software compatibility without firmware modification.

Supply Voltage Ranges: The DS1693 operates across dual voltage ranges (2.7V–3.3V and 4.5V–5.5V). Substitute parts must support at least one of these ranges to function within existing power distribution architectures.

Operating Temperature Range: The DS1693 operates from 0°C to 70°C. Substitute parts must meet or exceed this range to ensure reliable operation across the same environmental conditions.

Package Type: The DS1693 uses a 28-DIP Module (0.600", 15.24mm) through-hole package. Substitutes may use alternative packages (such as 28-SOIC surface mount) if the application permits PCB redesign; however, direct pin-compatible through-hole alternatives are preferred for drop-in replacement scenarios.

Battery Backup Voltage: The DS1693 requires battery backup in the 2.5V–3.7V range. Substitute parts must support compatible battery backup voltage ranges to maintain real-time clock operation during power loss.

Parameter Comparison

Engineering Selection Recommendations

M48T58-70PC1 (STMicroelectronics): This part is the preferred direct substitute for through-hole applications. It maintains identical package geometry (28-DIP Module, 0.600", 15.24mm), identical operating temperature range (0°C–70°C), and parallel interface compatibility. Both parts support the YY-MM-DD-dd date format. The M48T58-70PC1 is actively manufactured and ROHS3 compliant, addressing the obsolescence and compliance limitations of the DS1693. The supply voltage range (4.75V–5.5V) is compatible with the DS1693's 4.5V–5.5V range. This part is suitable for direct PCB replacement without layout modification.

BQ4802LYDWR (Texas Instruments): This part provides an alternative for applications where surface-mount technology is acceptable or preferred. It maintains parallel interface compatibility, supports HH:MM:SS (12/24 hr) time format and YY-MM-DD-dd date format, and operates within the 0°C–70°C temperature range. The BQ4802LYDWR is actively manufactured and ROHS3 compliant. However, the 28-SOIC package requires PCB redesign compared to the original 28-DIP through-hole package. The supply voltage range (2.7V–3.6V) covers the DS1693's lower voltage range but does not extend to 5.5V; applications requiring 5V operation must be evaluated for compatibility. The battery backup voltage range (2.4V–4V) is compatible with the DS1693's 2.5V–3.7V requirement.

Compliance Considerations: Both substitute parts are ROHS3 compliant and REACH unaffected, addressing environmental and regulatory requirements that the obsolete DS1693 does not meet. Selection should prioritize the M48T58-70PC1 for drop-in replacement scenarios requiring through-hole mounting and 5V operation. The BQ4802LYDWR is suitable for new designs or redesigns where surface-mount technology is acceptable and supply voltage remains within the 2.7V–3.6V range.

Frequently Asked Questions (FAQ)

Q: Can the BQ4802LYDWR replace the DS1693 in an existing design without PCB modification?

A: No. The BQ4802LYDWR uses a 28-SOIC surface-mount package, while the DS1693 uses a 28-DIP through-hole package. PCB redesign is required. For drop-in replacement without PCB modification, use the M48T58-70PC1, which maintains the same 28-DIP package footprint.

Q: Does the BQ4802LYDWR support 5V operation like the DS1693?

A: The BQ4802LYDWR supply voltage range is 2.7V–3.6V, which does not include 5V operation. If your application requires 5V supply voltage, the M48T58-70PC1 (4.75V–5.5V) is the appropriate substitute.

Q: Are both substitute parts compatible with the DS1693's parallel interface?

A: Yes. Both the BQ4802LYDWR and M48T58-70PC1 use parallel interfaces and support the same time format (HH:MM:SS, 12/24 hr) and date format (YY-MM-DD-dd) as the DS1693, ensuring firmware and communication protocol compatibility.

Q: What is the difference in battery backup voltage between the DS1693 and its substitutes?

A: The DS1693 requires 2.5V–3.7V battery backup. The BQ4802LYDWR supports 2.4V–4V, which is compatible. The M48T58-70PC1 does not specify a battery backup voltage range in the provided data. Verify battery backup requirements with the M48T58-70PC1 datasheet if battery-backed operation is critical.

Q: Which substitute part is recommended for new designs?

A: For new designs, either substitute is acceptable based on packaging requirements. The M48T58-70PC1 is recommended if through-hole mounting is preferred or if 5V operation is required. The BQ4802LYDWR is recommended for surface-mount designs operating within the 2.7V–3.6V supply range.

Q: Are both substitute parts actively manufactured?

A: Yes. Both the BQ4802LYDWR (Texas Instruments) and M48T58-70PC1 (STMicroelectronics) are classified as active products, ensuring long-term availability compared to the obsolete DS1693.