DS12C887 Real Time Clock IC - Equivalent & Substitute Parts

Part Overview

The DS12C887 is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This component provides 113 bytes of parallel interface memory with alarm, daylight savings, leap year, and non-volatile SRAM capabilities. The DS12C887 is classified as obsolete, making equivalent and substitute parts necessary for new designs and legacy system replacements. Substitute parts must maintain functional compatibility across time format, date format, interface type, and core RTC features while accommodating differences in packaging, voltage specifications, and operating temperature ranges.

Substiute Parts

DS12C887

Analog Devices Inc./Maxim IntegratedIn Stock: 15696DS12C887 Datasheet

Current PartRFQ

DS12C887+

Analog Devices Inc./Maxim IntegratedIn Stock: 52467DS12C887+ Datasheet

DirectRFQ

DP8573AVX/NOPB

National SemiconductorIn Stock: 1484DP8573AVX/NOPB Datasheet

MFR RecommendedRFQ

M48T201V-85MH1F

STMicroelectronicsIn Stock: 1609M48T201V-85MH1F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the DS12C887 is based on the following critical parameters:

Functional Compatibility Requirements:

• Clock/Calendar type with parallel interface
• Time format support: HH:MM:SS with 12/24 hour capability
• Date format support: YY-MM-DD-dd
• RTC alarm functionality
• Leap year support

Electrical Compatibility Considerations:

• Supply voltage range (primary and battery backup)
• Timekeeping current consumption
• Operating temperature range

Physical Compatibility Considerations:

• Mounting type (through hole vs. surface mount)
• Package form factor and pin count
• Mechanical dimensions

Substitute parts are grouped into two categories:

Category 1: Direct Pin-Compatible Replacement DS12C887+ maintains identical pinout, package (24-DIP), electrical specifications, and feature set. This part is functionally equivalent with improved RoHS3 compliance and active product status.

Category 2: Functional Equivalents with Package/Voltage Variations DP8573AVX/NOPB and M48T201V-85MH1F provide equivalent RTC Clock/Calendar functionality with parallel interface but differ in package type, pin count, voltage specifications, and operating temperature ranges. These require circuit board redesign and are suitable for new designs where legacy package constraints do not apply.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (No Board Redesign): DS12C887+ is the recommended substitute for legacy DS12C887 applications. This part maintains identical pinout, package configuration, and electrical specifications while offering active product status and RoHS3 compliance. No circuit modifications are required for this substitution.

For New Designs (Board Redesign Acceptable): DP8573AVX/NOPB and M48T201V-85MH1F are suitable for new designs where package constraints do not apply. Selection between these parts depends on specific system requirements:

• DP8573AVX/NOPB: Maintains 5V supply compatibility with extended operating temperature range (-40°C ~ 85°C) and significantly reduced timekeeping current (1µA @ 5V). Requires surface mount assembly and 28-pin PLCC package accommodation.

• M48T201V-85MH1F: Operates at 3V supply with integrated supervisor and watchdog timer functionality. Requires 3V system design and 44-pin BSOP package accommodation. Includes Y2K compliance and enhanced feature set.

All substitute parts maintain parallel interface architecture and core RTC Clock/Calendar functionality with YY-MM-DD-dd date format and HH:MM:SS time format support.

Frequently Asked Questions (FAQ)

Q: Can DS12C887+ be used as a direct replacement for DS12C887? A: Yes. DS12C887+ is pin-compatible and electrically equivalent. It maintains the 24-DIP package, 4.5V ~ 5.5V supply range, and identical feature set including alarm, daylight savings, leap year, NVSRAM, and square wave output. No circuit modifications are required.

Q: What are the key differences between DS12C887 and DP8573AVX/NOPB? A: DP8573AVX/NOPB differs in package type (28-LCC surface mount vs. 24-DIP through hole), pin count, and timekeeping current consumption (1µA @ 5V vs. 15mA). It lacks daylight savings functionality but supports extended operating temperature (-40°C ~ 85°C). Circuit board redesign is required.

Q: Is M48T201V-85MH1F compatible with 5V systems? A: No. M48T201V-85MH1F operates at 3V ~ 3.6V supply voltage and is not compatible with 5V systems. It requires system redesign for 3V operation. This part is suitable only for new 3V designs.

Q: What mounting considerations apply to substitute parts? A: DS12C887+ maintains through-hole mounting identical to the original part. DP8573AVX/NOPB and M48T201V-85MH1F are surface mount components requiring different PCB layout and assembly processes.

Q: Do all substitute parts support 12/24 hour time format? A: DS12C887+ and DP8573AVX/NOPB support 12/24 hour format. M48T201V-85MH1F supports 24-hour format only. Applications requiring 12-hour format must use DS12C887+ or DP8573AVX/NOPB.

Q: Are substitute parts RoHS compliant? A: DS12C887+ and M48T201V-85MH1F are RoHS3 compliant. DP8573AVX/NOPB RoHS status is not specified in available documentation. Verify compliance requirements with your procurement specifications.