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NXP Semiconductors P87C51RB+4A,512
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- Part No.:
- P87C51RB+4A,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RB+4A,512.pdf
- Description:
- IC MCU 8BIT 16KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,527
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Product details
Overview
P87C51RB+4A,512 from Philips Semiconductors is an 8-bit OTP microcontroller in the 8XC51RA+/RB+/RC+/RD+ family, featuring 16 KB 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 supports industrial temperature range (–40°C to +85°C) in a 44-pin PLCC package, used in motor control, industrial I/O, and embedded timing systems.
For engineers reviewing the P87C51RB+4A,512 datasheet, P87C51RB+4A,512 pinout, P87C51RB+4A,512 application, or P87C51RB+4A,512 equivalent, key selection criteria include OTP memory size (16K × 8), PCA-based PWM generation, hardware watchdog presence, 4-level interrupt priority, and compatibility with legacy 80C51 instruction set and toolchains.
Technical Context
The P87C51RB+4A,512 implements an enhanced 80C51 core with full static operation and dual DPTR registers. Its PCA module supports high-resolution pulse width modulation, input capture, and software-timed event counting via five independent CEX channels on Port 1.
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 including Idle and Power-Down - all while maintaining backward compatibility with standard 80C51 peripherals and addressing modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 8-bit 80C51-compatible CPU with full static operation and 24-clock-cycle machine cycle |
| Program Memory | 16 KB OTP - non-volatile, one-time programmable code storage; no external EPROM required |
| RAM Size | 512 bytes internal RAM - sufficient for real-time control stacks and data buffers without external expansion |
| Max Clock Frequency | 33 MHz - enables high-speed I/O handling and sub-µs timer resolution for motor commutation |
| Operating Voltage | 2.7 V to 5.5 V - supports battery-backed and mixed-voltage industrial systems |
| Temperature Range | –40°C to +85°C - qualified for industrial ambient environments without derating |
| Watchdog Timer | Hardware WDT - autonomous reset trigger prevents firmware lockup in unattended systems |
| PCA Channels | 5-channel programmable counter array - enables simultaneous PWM, capture, and frequency measurement tasks |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, lead-free compatible, with 0.050" pitch and internal thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/T2 | Timer 2 external clock input / output | Enables high-precision timebase sourcing or clock-out for synchronization |
| P1.1/T2EX | Timer 2 reload/capture/edge control | Supports auto-reload PWM and edge-triggered event capture |
| P1.2/ECI | External clock input to PCA | Allows PCA to run from external signal for frequency measurement |
| P1.3–P1.7/CEX0–CEX4 | PCA capture/compare I/O | Five independent channels for PWM generation, input capture, or software-timed outputs |
| RST | Reset input | Asynchronous active-high reset requiring ≥2 machine cycles (24 clocks) |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–33 MHz) or external CMOS clock source |
| EA/VPP | External access enable / programming voltage | When high, executes only from internal OTP; low enables external code fetch |
| P0.0–P0.7/AD0–AD7 | Multiplexed address/data bus | Drives lower 8 bits of external memory bus during MOVX accesses |
| P2.0–P2.7/A8–A15 | Upper address bus / I/O port | Provides high-order address bits for 64 KB external memory expansion |
| P3.0/RxD, P3.1/TxD | Full-duplex UART interface | Enhanced serial port with framing error detection and address recognition |
Key Features
| Feature | Design Value |
|---|---|
| 5-channel PCA with PWM capability | Enables concurrent motor phase control, LED dimming, and encoder pulse counting without CPU overhead |
| Hardware watchdog timer | Guarantees system recovery from runaway code without external components |
| 4-level nested interrupt priority | Allows deterministic response to critical events (e.g., fault detection) ahead of background tasks |
| Enhanced UART with auto-address recognition | Reduces protocol overhead in multi-node RS-485 networks by filtering addressed frames in hardware |
| Low-power operating modes | Idle mode halts CPU while preserving peripheral state; Power-Down stops oscillator for µA-level standby current |
| OTP security bits (3-bit) | Prevents unauthorized readout of firmware through hardware-level code protection |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Closed-loop DC brushless motor drive with Hall sensor feedback and six-step commutation. IC Role / Device Role / Timing Role: Primary controller executing commutation logic, generating synchronized PWM signals via PCA CEX outputs, and monitoring rotor position via INT0/INT1. Use Value: Eliminates need for external PWM generators or FPGA glue logic; 33 MHz clock enables ≤30 ns PWM resolution for precise torque control. | Use Scenario: DIN-rail mounted digital input/output expansion unit with isolated 24 VDC I/O and Modbus RTU communication. IC Role / Device Role / Timing Role: Central MCU managing opto-isolated inputs, relay/SSR outputs, and UART-based Modbus slave stack. Use Value: Hardware UART with auto-address recognition reduces CPU load during polling; 512-byte RAM accommodates protocol buffers and status registers. |
| Smart Energy Meter Interface | Embedded Test Equipment Controller |
Use Scenario: Pulse-counting interface between utility meter kWh pulses and wireless telemetry module. IC Role / Device Role / Timing Role: Edge-triggered pulse accumulator using T0/T1 and PCA CEX inputs to count meter pulses while running low-power sleep cycles. Use Value: Hardware watchdog ensures reliable long-term operation; OTP memory secures firmware against field corruption. | Use Scenario: Portable handheld tester for validating sensor calibration and actuator response in HVAC field service. IC Role / Device Role / Timing Role: Real-time sequencer coordinating analog stimulus generation, ADC sampling, and LCD display updates. Use Value: Dual DPTR registers simplify buffer management between stimulus waveform tables and measurement results; 2.7–5.5 V operation supports single-cell Li-ion battery input. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51RC+4A | 32 KB OTP, same 512-byte RAM, identical PCA and peripheral set | Higher code density for complex control algorithms or integrated communication stacks | Select when firmware exceeds 16 KB but same I/O and timing features are required |
| P87C51FA–4A | 8 KB OTP, 256-byte RAM, no hardware watchdog or PCA; shares same PLCC-44 package | Limited to simpler control tasks without PWM or robust fault recovery | Choose for cost-sensitive designs where watchdog and advanced timing are unnecessary |
Compared with P87C51RC+4A, the P87C51RB+4A,512 offers reduced code capacity but identical peripheral functionality and lower unit cost; versus P87C51FA–4A, it adds critical reliability features (WDT, PCA) and doubles RAM - making it suitable for safety-aware or multi-tasking embedded applications.
Availability
P87C51RB+4A,512 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, smart meter interfaces, and embedded test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for P87C51RB+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
Philips Semiconductors (now NXP Semiconductors) is a global semiconductor leader known for high-reliability logic, analog, and microcontroller solutions targeting industrial, automotive, and consumer markets.
The 8XC51RA+/RB+/RC+/RD+ product line was designed specifically for industrial control applications demanding OTP security, hardware watchdog resilience, and precision timing - extending the 80C51 architecture with PCA and enhanced power management.
FAQ
What is the maximum operating frequency of the P87C51RB+4A,512?
The P87C51RB+4A,512 supports a maximum clock frequency of 33 MHz when powered at 5 V. At 2.7–5.5 V operation, the device maintains full functionality up to this speed, enabling sub-microsecond timer resolution and high-throughput serial communication - essential for real-time motor control and industrial automation tasks executed by the P87C51RB+4A,512.
Does the P87C51RB+4A,512 include a hardware watchdog timer?
Yes, the P87C51RB+4A,512 integrates a dedicated hardware watchdog timer (WDT) that operates independently of the CPU clock. This feature ensures automatic system reset upon firmware hang or infinite loop conditions - a critical reliability enhancement over base 80C51 derivatives. The WDT is enabled and configured via SFR bits in the P87C51RB+4A,512's power control register.
How much internal RAM does the P87C51RB+4A,512 provide?
The P87C51RB+4A,512 provides 512 bytes of on-chip RAM, organized as standard 80C51 internal data memory plus additional space accessible via indirect addressing. This doubled RAM capacity (vs. 256-byte variants like P87C51FA) supports larger stack depths, multiple interrupt contexts, and real-time data buffering - directly benefiting applications such as Modbus RTU protocol stacks and multi-sensor fusion running on the P87C51RB+4A,512.
What package type is used for the P87C51RB+4A,512?
The P87C51RB+4A,512 is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2. This surface-mount package features a 0.050" lead pitch, J-bend leads, and an internal thermal pad - optimized for industrial PCB assembly, thermal dissipation in enclosed enclosures, and long-term mechanical reliability under vibration, as required in deployed P87C51RB+4A,512-based systems.
Is the P87C51RB+4A,512 pin-compatible with other members of the 8XC51RA+ family?
Yes, the P87C51RB+4A,512 is pin-compatible with other 44-pin PLCC variants in the 8XC51RA+/RB+/RC+/RD+ family, including P87C51RA+4A, P87C51RC+4A, and P87C51RD+4A. All share identical pinout, electrical characteristics, and peripheral mapping - allowing hardware design reuse across different code-size requirements while retaining full software compatibility with the P87C51RB+4A,512.
P87C51RB+4A,512 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 44-LCC (J-Lead)
- Series:
- 87C
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- 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:
- 16KB (16K 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:
P87C51RB+4A,512 FAQ
1.How can I place an order for P87C51RB+4A,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RB+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 P87C51RB+4A,512 reliable?
The price and inventory of P87C51RB+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 P87C51RB+4A,512 is usually 5 days.
3.What payment methods are accepted for P87C51RB+4A,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RB+4A,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RB+4A,512?
P87C51RB+4A,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RB+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 P87C51RB+4A,512?
For technical support, including P87C51RB+4A,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RB+4A,512 requirements.
6.How does Aetrix verify that P87C51RB+4A,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RB+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 P87C51RB+4A,512 meets industry standards.
7.What is the process for return or replacement of P87C51RB+4A,512?
All P87C51RB+4A,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RB+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 P87C51RB+4A,512 part is unused and in its original packaging.
Return procedure for P87C51RB+4A,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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