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NXP Semiconductors P87C51RC+4A,512
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- Part No.:
- P87C51RC+4A,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RC+4A,512.pdf
- Description:
- IC MCU 8BIT 32KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,368
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Product details
Overview
P87C51RC+4A,512 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the enhanced 80C51 architecture, featuring 32KB on-chip program memory, 512 bytes of RAM, hardware watchdog timer, and programmable counter array (PCA) with five capture/compare modules. It operates at up to 33 MHz across 2.7–5.5 V and targets embedded control in industrial automation, motor drive interfaces, and legacy system upgrades.
For engineers reviewing the P87C51RC+4A,512 datasheet, P87C51RC+4A,512 pinout, P87C51RC+4A,512 application, or P87C51RC+4A,512 equivalent, this device requires attention to its 44-pin PLCC package, PCA-based PWM generation, dual DPTR support, asynchronous port reset capability, and OTP security bit configuration for secure firmware deployment.
Technical Context
The P87C51RC+4A,512 implements a static CMOS 80C51-compatible core with full instruction set compatibility and architectural enhancements including a 16-bit PCA module supporting edge-triggered capture, software-timed compare, and high-resolution PWM outputs. Its interrupt structure supports four priority levels and seven sources, including PCA overflow and external interrupts INT0/INT1.
It integrates a full-duplex enhanced UART with framing error detection and automatic address recognition, three 16-bit timers (T0/T1/T2), and power management modes - Idle, Stop Clock, and Power-Down - enabling flexible trade-offs between responsiveness and energy efficiency in battery-backed or thermally constrained systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with static design supporting 0–33 MHz operation |
| Program Memory | 32 KB OTP ROM - non-volatile, one-time programmable, supports secure code storage |
| RAM Size | 512 bytes internal RAM - sufficient for real-time control stacks and intermediate data buffers |
| PCA Channels | 5-channel programmable counter array - enables simultaneous PWM, input capture, and time-stamping |
| Watchdog Timer | Hardware WDT with independent oscillator - ensures fail-safe recovery in unattended systems |
| Supply Voltage | 2.7–5.5 V - compatible with both 3.3 V and 5 V logic domains without level shifting |
| Package Type | 44-pin Plastic Leaded Chip Carrier (PLCC, SOT187-2) - surface-mount, rework-friendly, thermal performance suitable for industrial PCBs |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, lead pitch 1.27 mm, body size 16.5 × 16.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/T2 | Timer 2 external count input / clock output | Enables high-precision event counting or generates synchronous clock signals for peripherals |
| P1.1/T2EX | Timer 2 reload/capture/direction control | Supports auto-reload mode and bidirectional edge detection for quadrature decoding |
| P1.2/ECI | External clock input to PCA | Allows PCA timing to be driven by external signal (e.g., encoder feedback or sensor pulse) |
| P1.3–P1.7/CEX0–CEX4 | PCA capture/compare I/O channels | Five independent pins for PWM output, input capture, or software-timed toggling |
| RST | Active-high reset input | Asynchronous reset requiring ≥2 machine cycles; supports external RC or supervisor IC integration |
| P3.0/RxD & P3.1/TxD | Full-duplex UART serial interface | Enhanced UART with framing error detection and automatic address recognition for multi-drop bus |
| XTAL1/XTAL2 | Crystal oscillator inputs | Supports quartz crystals (1–33 MHz) or external clock source on XTAL1 only |
Key Features
| Feature | Design Value |
|---|---|
| Second DPTR register | Enables efficient indirect addressing during table lookups or block memory transfers without register save/restore overhead |
| Asynchronous port reset | Allows individual port latches to be reset independently of CPU state - critical for safe I/O initialization after fault recovery |
| Low EMI ALE inhibit | Disabling ALE reduces electromagnetic emissions during high-noise industrial operation without affecting memory access timing |
| Security bits (3-bit OTP) | Prevents unauthorized read-out of firmware via JTAG or parallel programming - essential for IP protection in OEM designs |
| RAM expandable to 64 KB | Supports external SRAM expansion via MOVX @DPTR - extends data space for logging, buffering, or algorithmic workloads |
Applications
| Industrial Motor Control | Legacy System Upgrade |
|---|---|
Use Scenario: Closed-loop speed regulation of brushed DC motors using hall-effect feedback and PWM-driven H-bridge drivers. IC Role / Device Role / Timing Role: Main controller executing PID loop, generating 16-bit resolution PWM via PCA CEX0–CEX4, and managing UART-based host commands. Use Value: Hardware PCA eliminates software PWM jitter; 512-byte RAM accommodates real-time PID coefficients and error history buffers. | Use Scenario: Replacement of obsolete 8051-based controllers in HVAC control panels with extended memory and watchdog reliability. IC Role / Device Role / Timing Role: Drop-in functional replacement preserving existing PCB layout while adding secure OTP firmware and low-power idle modes. Use Value: Pin-compatible with legacy 44-pin PLCC 80C51 variants; OTP prevents cloning; watchdog ensures uptime in unattended environments. |
| Smart Sensor Interface | Power Supply Monitoring |
Use Scenario: Aggregating analog sensor data (via external ADC) and digital inputs (e.g., flow switches), then transmitting via RS-485. IC Role / Device Role / Timing Role: Data concentrator with UART multiprocessor communication mode, PCA-based timestamping of events, and hardware WDT supervision. Use Value: Automatic address recognition simplifies multi-node bus arbitration; PCA timestamps enable precise event sequencing without CPU load. | Use Scenario: Real-time monitoring of rail voltages, temperature, and fan status in telecom power shelves with fault logging to external EEPROM. IC Role / Device Role / Timing Role: Supervisor MCU sampling analog inputs via external ADC, storing fault logs in external memory, and signaling alarms over UART. Use Value: Dual DPTR enables concurrent access to internal registers and external EEPROM; 2.7–5.5 V operation covers wide input range of DC-DC converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51RB+4A | 16 KB OTP, same 44-pin PLCC package, identical peripheral set except reduced program memory | Suitable where firmware size < 16 KB and cost optimization is prioritized over future code growth headroom | Select when application firmware fits within 16 KB and BOM cost reduction is critical; retains full pin and code compatibility |
| P87C51RD+4A | 64 KB OTP, same package and peripherals, adds 1 KB RAM and extended addressing capability | Required for complex protocol stacks (e.g., Modbus TCP offload) or large lookup tables not feasible in 32 KB | Choose when firmware exceeds 32 KB or when >512-byte RAM is needed for real-time data buffering or encryption contexts |
Compared with P87C51RC+4A,512, the P87C51RB+4A offers lower memory cost but constrains firmware scalability, while the P87C51RD+4A provides headroom for feature-rich firmware at higher unit cost - all share identical I/O, timing, and power characteristics.
Availability
P87C51RC+4A,512 is available at Aetrix Electronics and suitable for industrial motor control, legacy system upgrades, and smart sensor interface applications requiring stable component supply and long-term manufacturing continuity.
Supply support for P87C51RC+4A,512 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor leader delivering secure, scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.
The P87C51RC+4A,512 belongs to NXP's legacy 80C51-enhanced microcontroller family, designed specifically for cost-sensitive, reliability-critical embedded control applications where proven architecture, OTP security, and industrial temperature tolerance are mandatory.
FAQ
What is the maximum operating frequency of the P87C51RC+4A,512?
The P87C51RC+4A,512 supports a maximum operating frequency of 33 MHz when powered at 5 V. At 2.7–3.6 V, the maximum rated frequency is 16 MHz per datasheet specifications. This dual-speed capability allows designers to optimize between performance and power consumption depending on system voltage rails and thermal constraints. The P87C51RC+4A,512 uses a static CMOS core that permits clock stopping without data loss.
Does the P87C51RC+4A,512 include a hardware watchdog timer?
Yes, the P87C51RC+4A,512 integrates a dedicated hardware watchdog timer with an independent oscillator, enabling reliable system recovery even if the main CPU locks up. The WDT can be enabled or disabled via SFR configuration and supports timeout periods configurable through prescaler settings. This feature is essential for unattended industrial equipment, and the P87C51RC+4A,512's WDT behavior is fully documented in its product specification revision of August 2000.
How many capture/compare channels does the PCA module in the P87C51RC+4A,512 support?
The P87C51RC+4A,512 features a 16-bit Programmable Counter Array (PCA) with five independent capture/compare modules (CEX0–CEX4), each mapped to dedicated Port 1 pins (P1.3–P1.7). These channels support simultaneous PWM generation, input capture with timestamping, and software-timed toggling - making the P87C51RC+4A,512 especially suited for motor control and encoder interfacing tasks requiring precise timing coordination.
What package type is used for the P87C51RC+4A,512?
The P87C51RC+4A,512 is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2, with 1.27 mm lead pitch and 16.5 × 16.5 mm body dimensions. This surface-mount package offers robust thermal performance and mechanical reliability for industrial PCB assembly, and is pin-compatible with other members of the 8XC51RA+/RB+/RC+/RD+ family in the same footprint.
Is the P87C51RC+4A,512 pin-compatible with earlier 80C51 derivatives?
The P87C51RC+4A,512 maintains full pin compatibility with other 44-pin PLCC variants in the 8XC51RA+/RB+/RC+/RD+ family (e.g., P87C51RA+4A, P87C51RB+4A), including identical Port 0–3 assignments, reset, oscillator, and control pin locations. However, it is not pin-compatible with 40-pin DIP versions or unrelated families like 8XC54/58 due to differing pin counts and PCA-specific Port 1 functions. Always verify pin mapping against the official P87C51RC+4A,512 datasheet before board reuse.
P87C51RC+4A,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 87C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- 8051
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- EBI/EMI, UART/USART
- Peripherals:
- POR, PWM, WDT
- Number of I/O:
- 32
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 512 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51RC+4A,512 FAQ
1.How can I place an order for P87C51RC+4A,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RC+4A,512 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for P87C51RC+4A,512 reliable?
The price and inventory of P87C51RC+4A,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51RC+4A,512 is usually 5 days.
3.What payment methods are accepted for P87C51RC+4A,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RC+4A,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RC+4A,512?
P87C51RC+4A,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RC+4A,512 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for P87C51RC+4A,512?
For technical support, including P87C51RC+4A,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RC+4A,512 requirements.
6.How does Aetrix verify that P87C51RC+4A,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RC+4A,512 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that P87C51RC+4A,512 meets industry standards.
7.What is the process for return or replacement of P87C51RC+4A,512?
All P87C51RC+4A,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RC+4A,512, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The P87C51RC+4A,512 part is unused and in its original packaging.
Return procedure for P87C51RC+4A,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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