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DS87C520-ENL Equivalent & Substitute Parts
Part Overview
The DS87C520-ENL is an 8051-based 8-bit microcontroller manufactured by Analog Devices Inc./Maxim Integrated, featuring 16KB OTP program memory, 1KB RAM, and 32 I/O pins in a 44-TQFP surface mount package. Operating at 33MHz with a supply voltage range of 4.5V to 5.5V, this device integrates power-fail reset and watchdog timer peripherals for embedded control applications.
The DS87C520-ENL carries an Obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support legacy system maintenance or redesign initiatives.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Core Processor | 8051 |
| Core Size | 8-Bit |
| Speed | 33MHz |
| Program Memory Size | 16KB (16K x 8) |
| Program Memory Type | OTP |
| RAM Size | 1K x 8 |
| Number of I/O | 32 |
| Voltage - Supply (Vcc/Vdd) | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 44-TQFP (10x10) |
| Mounting Type | Surface Mount |
| Connectivity | EBI/EMI, SIO, UART/USART |
| Peripherals | Power-Fail Reset, WDT |
Substitute Part Grouping Explanation
Substitution of the DS87C520-ENL is determined by strict equivalence across the following critical parameters:
- Core Architecture: 8051 processor family
- Memory Configuration: 16KB OTP program memory, 1KB RAM
- Electrical Specifications: 33MHz clock speed, 4.5V to 5.5V supply voltage range, -40°C to 85°C operating temperature
- I/O Count: 32 I/O pins
- Package: 44-TQFP (10x10) surface mount
- Connectivity & Peripherals: EBI/EMI, SIO, UART/USART, Power-Fail Reset, WDT
The DS87C520-ENL+ qualifies as a direct substitute based on identical electrical, functional, and mechanical specifications. Differences in product status, packaging format, and compliance certifications do not affect functional interchangeability in circuit applications.
Parameter Comparison
| Parameter | DS87C520-ENL | DS87C520-ENL+ |
|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated |
| Core Processor | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit |
| Speed | 33MHz | 33MHz |
| Program Memory Size | 16KB (16K x 8) | 16KB (16K x 8) |
| Program Memory Type | OTP | OTP |
| RAM Size | 1K x 8 | 1K x 8 |
| Number of I/O | 32 | 32 |
| Voltage - Supply (Vcc/Vdd) | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Package / Case | 44-TQFP (10x10) | 44-TQFP (10x10) |
| Mounting Type | Surface Mount | Surface Mount |
| Connectivity | EBI/EMI, SIO, UART/USART | EBI/EMI, SIO, UART/USART |
| Peripherals | Power-Fail Reset, WDT | Power-Fail Reset, WDT |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 3 (168 Hours) |
Engineering Selection Recommendations
The DS87C520-ENL+ is the direct functional equivalent of the DS87C520-ENL. Both devices share identical core architecture, memory configuration, electrical specifications, and package format, ensuring pin-for-pin and functional compatibility.
The DS87C520-ENL+ offers the following advantages for new designs and legacy system support:
- Active Product Status: Ensures ongoing availability and supply chain continuity
- ROHS3 Compliance: Meets current environmental and regulatory requirements
- Verified Programmability: Confirmed programming capability through DiGi-Electronics verification
Selection of the DS87C520-ENL+ is appropriate for applications requiring compliance with modern regulatory standards or where long-term component availability is a design consideration.
Frequently Asked Questions (FAQ)
Q: Are the DS87C520-ENL and DS87C520-ENL+ pin-for-pin compatible?
A: Yes. Both devices use the 44-TQFP (10x10) package with identical pin assignments, electrical characteristics, and functional specifications. Direct substitution is possible without circuit modification.
Q: What is the difference between OTP and other program memory types?
A: OTP (One-Time Programmable) memory is programmed once during manufacturing or initial device programming and cannot be erased or reprogrammed. Both the DS87C520-ENL and DS87C520-ENL+ use OTP memory, making them suitable for production applications where code stability is required.
Q: Does the RoHS compliance difference affect functional compatibility?
A: No. RoHS compliance relates to material composition and environmental standards, not electrical function or performance. The DS87C520-ENL+ ROHS3 compliance status makes it preferable for applications subject to environmental regulations, but both devices operate identically in circuit.
Q: What does MSL 3 (168 Hours) mean for handling and storage?
A: MSL 3 indicates Moisture Sensitivity Level 3, requiring storage in controlled humidity conditions (less than 60% relative humidity) for up to 168 hours after package opening. Both devices share this specification and require identical handling protocols.
Q: Can the DS87C520-ENL+ be used in legacy designs originally specified for the DS87C520-ENL?
A: Yes. The DS87C520-ENL+ is functionally equivalent and can replace the DS87C520-ENL in existing designs without modification. The Active product status of the DS87C520-ENL+ makes it the recommended choice for ongoing production and support.
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