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DP8573AVX Real Time Clock IC Equivalent & Substitute Parts
Part Overview
The DP8573AVX is a Real Time Clock (RTC) IC with Clock/Calendar functionality in a 28-LCC (J-Lead) surface mount package, manufactured by Texas Instruments. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The DP8573AVX provides parallel interface timekeeping with alarm and leap year capabilities, operating across a 4.5V to 5.5V supply range with battery backup support from 2.2V to 5.1V.
Substiute Parts
Key Parameters
| Parameter | DP8573AVX |
|---|---|
| Manufacturer | Texas Instruments |
| Product Status | Obsolete |
| Type | Clock/Calendar |
| Interface | Parallel |
| Package / Case | 28-LCC (J-Lead) |
| Mounting Type | Surface Mount |
| Voltage - Supply | 4.5V ~ 5.5V |
| Voltage - Supply, Battery | 2.2V ~ 5.1V |
| Current - Timekeeping (Max) | 1µA @ 5V |
| Operating Temperature | -40°C ~ 85°C |
| Time Format | HH:MM:SS:hh (12/24 hr) |
| Date Format | YY-MM-DD-dd |
| Features | Alarm, Leap Year |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution for the DP8573AVX is determined by the following critical parameters:
Primary Substitution Criteria:
- Parallel interface requirement
- Clock/Calendar functionality with alarm and leap year support
- Operating temperature range compatibility (-40°C ~ 85°C preferred)
- Supply voltage compatibility (4.5V ~ 5.5V primary operation)
- RoHS3 compliance status (preferred for modern designs)
Secondary Considerations:
- Package type (surface mount vs. through hole)
- Memory size (non-critical for basic timekeeping)
- Mounting footprint compatibility
- Current consumption during timekeeping mode
Substitute parts are grouped into two categories: direct package equivalents (28-LCC or similar surface mount) and functional equivalents with alternative packages (DIP, SOIC, TSSOP). All listed substitutes maintain parallel interface operation and support the required time/date formats.
Parameter Comparison
| Parameter | DP8573AVX | DP8573AVX/NOPB | DS12885N+ | DS1501WZN+T&R | DS1511W+ | DS1685E-5+T&R | DS1685S-5+T&R | DS17285SN-3+ | DS17485S-5+T&R |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | National Semiconductor | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim | Analog Devices Inc./Maxim |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active |
| Type | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar | Clock/Calendar |
| Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Package / Case | 28-LCC (J-Lead) | 28-LCC (J-Lead) | 24-DIP (0.600") | 28-SOIC (0.295") | 28-DIP Module (0.600") | 24-TSSOP (0.173") | 24-SOIC (0.295") | 24-SOIC (0.295") | 24-SOIC (0.295") |
| Mounting Type | Surface Mount | Surface Mount | Through Hole | Surface Mount | Through Hole | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 3V ~ 3.6V | 3V ~ 3.6V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 2.7V ~ 3.7V | 4.5V ~ 5.5V |
| Voltage - Supply, Battery | 2.2V ~ 5.1V | 2.5V ~ 4V | 2.5V ~ 4V | 2.5V ~ 3.7V | 2.5V ~ 3.7V | 2.5V ~ 3.7V | 2.5V ~ 3.7V | 2.5V ~ 3.7V | 2.5V ~ 3.7V |
| Current - Timekeeping (Max) | 1µA @ 5V | 1µA @ 5V | 15mA @ 4.5V ~ 5.5V | 4mA @ 3V ~ 3.6V | 4mA @ 3V ~ 3.6V | 3mA @ 5V | 3mA @ 5V | 2mA @ 2.7V ~ 3.7V | 3mA @ 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C | 0°C ~ 70°C | 0°C ~ 70°C | -40°C ~ 85°C | 0°C ~ 70°C |
| Time Format | HH:MM:SS:hh (12/24 hr) | HH:MM:SS:hh (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) | HH:MM:SS (12/24 hr) |
| Date Format | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd | YY-MM-DD-dd |
| Features | Alarm, Leap Year | Alarm, Leap Year | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Alarm, Leap Year, NVSRAM, Square Wave Output, Watchdog Timer, Y2K | Alarm, NVSRAM, Square Wave Output, Y2K | Alarm, NVSRAM, Square Wave Output, Y2K | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output | Alarm, Daylight Savings, Leap Year, NVSRAM, Square Wave Output |
| RoHS Status | RoHS non-compliant | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalent (Recommended for Pin-Compatible Replacement): DP8573AVX/NOPB is the direct equivalent from National Semiconductor, maintaining identical package (28-LCC), pinout, voltage specifications, and operating temperature range. This part is active and suitable for immediate substitution in existing designs without PCB modification.
Active Substitutes for 4.5V ~ 5.5V Supply Systems: DS12885N+, DS1685E-5+T&R, DS1685S-5+T&R, and DS17485S-5+T&R are all active Analog Devices/Maxim parts compatible with 4.5V ~ 5.5V supply voltage. These parts feature ROHS3 compliance and enhanced functionality including NVSRAM and watchdog timer capabilities. Package changes require PCB redesign: DS12885N+ uses 24-DIP (through hole), DS1685E-5+T&R uses 24-TSSOP (surface mount), DS1685S-5+T&R and DS17485S-5+T&R use 24-SOIC (surface mount).
Extended Temperature Range Compatibility (-40°C ~ 85°C): DS12885N+, DS1501WZN+T&R, and DS17285SN-3+ support the full -40°C ~ 85°C operating temperature range. DS12885N+ and DS17285SN-3+ are ROHS3 compliant. DS1501WZN+T&R operates at 3V ~ 3.6V supply, requiring voltage regulation if 5V supply is primary.
ROHS3 Compliant Alternatives: All substitute parts except DP8573AVX/NOPB carry ROHS3 compliance certification, meeting modern environmental and regulatory requirements. Selection should prioritize ROHS3 compliant parts for new designs.
Frequently Asked Questions (FAQ)
Q: Can DP8573AVX/NOPB be used as a direct replacement without PCB changes? A: Yes. DP8573AVX/NOPB maintains identical 28-LCC package, pinout, voltage specifications (4.5V ~ 5.5V), and operating temperature range (-40°C ~ 85°C). No PCB modification is required.
Q: What is the primary difference between DP8573AVX and the Analog Devices/Maxim substitutes? A: The DP8573AVX is obsolete and RoHS non-compliant. Analog Devices/Maxim alternatives are active, ROHS3 compliant, and offer enhanced features such as NVSRAM, watchdog timers, and Y2K support. Package types differ across the substitute range.
Q: Which substitute is best for 5V supply systems requiring -40°C ~ 85°C operation? A: DS12885N+ is the optimal choice, offering 4.5V ~ 5.5V supply compatibility, -40°C ~ 85°C operating range, ROHS3 compliance, and active product status. The 24-DIP through-hole package requires PCB redesign.
Q: Are all substitutes pin-compatible with the original DP8573AVX? A: No. Only DP8573AVX/NOPB maintains pin compatibility. All Analog Devices/Maxim parts use different packages (24-DIP, 24-SOIC, 24-TSSOP, 28-SOIC, 28-EDIP) and require PCB layout modifications and firmware validation.
Q: What is the significance of NVSRAM in the substitute parts? A: NVSRAM (Non-Volatile Static RAM) provides additional user-accessible memory beyond the basic clock/calendar registers. This feature is not present in the original DP8573AVX but is available in most active substitutes, offering design flexibility for applications requiring additional data storage.
Q: Can DS1501WZN+T&R or DS1511W+ be used in place of DP8573AVX in a 5V system? A: No. Both parts operate at 3V ~ 3.6V supply voltage. While they support 24-hour time format and include enhanced features, they require voltage regulation or system redesign for 5V primary supply compatibility.
Q: What packaging considerations apply when selecting a substitute? A: DP8573AVX uses 28-LCC surface mount. Substitutes vary: DP8573AVX/NOPB maintains 28-LCC; DS12885N+ and DS1511W+ use through-hole DIP packages; DS1501WZN+T&R, DS1685E-5+T&R, DS1685S-5+T&R, DS17285SN-3+, and DS17485S-5+T&R use surface mount packages (SOIC or TSSOP). Package selection impacts PCB footprint, assembly process, and thermal management.
Q: Is firmware modification required when switching to a substitute part? A: Register-level compatibility must be verified against the specific substitute selected. While all parts maintain parallel interface and basic clock/calendar functionality, enhanced features (watchdog timer, Y2K support, NVSRAM) may require firmware updates to utilize or disable appropriately.
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