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NXP Semiconductors P87C51RA+4A,512
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- Part No.:
- P87C51RA+4A,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RA+4A,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,076
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Product details
Overview
P87C51RA+4A,512 from Philips Semiconductors is an 8-bit OTP microcontroller based on the enhanced 80C51 architecture, featuring 8 KB ROM/OTP, 512 bytes RAM, hardware watchdog timer, and programmable counter array (PCA) for capture/compare/PWM. It operates from 2.7 V to 5.5 V at up to 16 MHz and targets industrial control, motor drive interfaces, and embedded instrumentation requiring deterministic timing and external memory expansion.
For engineers reviewing the P87C51RA+4A,512 datasheet, P87C51RA+4A,512 pinout, P87C51RA+4A,512 application, or P87C51RA+4A,512 equivalent, key selection criteria include its 44-pin PLCC package, PCA-based PWM generation, dual DPTR support, asynchronous port reset, and compatibility with standard TTL external memory up to 64 KB.
Technical Context
This device belongs to the 8XC51RA+ family - a derivative of the 80C51 core with architectural enhancements including a 5-channel programmable counter array (PCA), hardware watchdog timer, and enhanced UART with automatic address recognition and framing error detection. It retains full instruction set compatibility with the baseline 80C51.
The P87C51RA+4A,512 implements four 8-bit I/O ports (P0–P3), three 16-bit timers (T0/T1/T2), and supports both internal and external program memory access via EA/VPP pin logic. Its static CMOS design enables full-speed operation down to 0 Hz in Stop Clock mode, with power-down and idle modes for low-power system management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Enhanced 80C51 8-bit CPU with full instruction set compatibility |
| Memory (ROM/OTP) | 8 KB - sufficient for medium-complexity firmware without external code storage |
| RAM Size | 512 bytes - supports larger stack depth and data buffers than base 80C51 |
| Operating Voltage | 2.7 V to 5.5 V - enables single-supply operation across industrial and battery-powered systems |
| Max Clock Frequency | 16 MHz - delivers ~2 MIPS throughput with 12-clock-per-instruction cycle |
| Watchdog Timer | Integrated hardware WDT - prevents runaway code in safety-critical embedded applications |
| PCA Channels | 5-channel Programmable Counter Array - enables simultaneous PWM, input capture, and software timers |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, suitable for socketed or surface-mount industrial PCBs with thermal and mechanical robustness.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/T2 | Timer 2 external count input / clock output | Enables high-resolution event counting or precise clock distribution to peripherals |
| P1.1/T2EX | Timer 2 reload/capture/direction control | Supports auto-reload PWM and edge-triggered capture for encoder or pulse measurement |
| P1.2/ECI | External clock input to PCA | Allows PCA to run from independent timing source for synchronized multi-channel operation |
| P1.3–P1.7/CEX0–CEX4 | PCA capture/compare I/O channels | Each pin provides dedicated hardware PWM output or input capture with minimal CPU overhead |
| RST | Reset input | Asynchronous active-high reset with internal pull-down; requires ≥2 machine cycles for reliable assertion |
| EA/VPP | External access enable / programming voltage | Controls boot source: high = internal memory only; low = fetch from external program memory starting at 0000H |
| P0.0–P0.7/AD0–AD7 | Address/data multiplexed bus | Serves as lower 8-bit address + data during external memory accesses; requires external latch for AD demux |
| P2.0–P2.7/A8–A15 | Upper address bus | Provides high-order address bits for 64 KB external memory addressing capability |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Counter Array (PCA) | Five independent 16-bit modules supporting PWM generation, input capture, software timers, and high-speed I/O with zero CPU polling overhead |
| Hardware Watchdog Timer | Dedicated on-chip WDT with configurable timeout - eliminates need for external watchdog IC in cost-sensitive designs |
| Enhanced UART | Full-duplex with framing error detection and automatic address recognition - simplifies multi-drop RS-485 network implementation |
| Second DPTR register | Enables efficient indirect addressing of two separate data memory regions - critical for buffer management in communication stacks |
| Asynchronous Port Reset | I/O ports (P1–P3) transition to known state immediately upon RST assertion - improves system reliability during brown-out recovery |
| Low EMI ALE inhibition | ALE signal can be disabled via SFR bit to reduce electromagnetic emissions - aids EMC compliance in noise-sensitive environments |
Applications
| Motor Control Interface | Industrial Data Logger |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from hall-effect sensors and real-time PWM adjustment. IC Role / Device Role / Timing Role: Central controller executing PID algorithm, generating 5-channel PWM outputs via PCA, and managing serial telemetry to host PC. Use Value: Hardware PCA offloads PWM timing from CPU, enabling consistent 10–20 kHz switching frequency with jitter < 1 µs - essential for smooth torque delivery. | Use Scenario: Standalone environmental sensor node logging temperature, humidity, and pressure at 1-second intervals to SPI flash memory. IC Role / Device Role / Timing Role: Main MCU handling sensor I²C reads, timestamping via T2, buffering data in 512-byte RAM, and managing flash writes over SPI interface. Use Value: Integrated hardware watchdog ensures recovery from flash write errors; dual DPTR enables concurrent buffer management and flash command execution. |
| Legacy System Upgrade | RS-485 Industrial Gateway |
Use Scenario: Drop-in replacement for obsolete 80C32 in aging PLC I/O module requiring extended memory and improved interrupt latency. IC Role / Device Role / Timing Role: Pin-compatible upgrade path retaining same PCB layout while adding 256-byte RAM increase, PCA, and WDT. Use Value: 512-byte RAM allows deeper interrupt nesting and larger protocol stacks; enhanced UART reduces firmware complexity for Modbus RTU parsing. | Use Scenario: Protocol translator bridging CAN bus field devices to Modbus RTU over RS-485 in factory automation networks. IC Role / Device Role / Timing Role: Dual-protocol gateway running CAN controller firmware and Modbus RTU slave stack with hardware-assisted UART framing detection. Use Value: Enhanced UART's automatic address recognition and framing error detection eliminate software CRC checks - reducing latency by ~120 µs per frame. |
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 instead of 8 KB; identical pinout, package, and peripheral set | Requires no layout change but supports larger firmware images and more complex protocols | Select when firmware size exceeds 8 KB and memory headroom is needed for future updates |
| P87C51RC+4A | 32 KB OTP, same 44-pin PLCC package and peripheral complement | Enables integration of bootloader, diagnostics, and dual-application partitioning without external memory | Choose for systems requiring field-upgradable firmware or secure boot functionality |
Compared with P87C51RA+4A,512, the P87C51RB+4A and P87C51RC+4A provide scalable code memory (16 KB and 32 KB respectively) while preserving identical I/O mapping, timing behavior, and power characteristics - allowing seamless migration within the same hardware platform.
Availability
P87C51RA+4A,512 is available at Aetrix Electronics and suitable for industrial control, motor drive interfaces, and embedded instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for P87C51RA+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 innovator focused on high-reliability, industrial-grade ICs with strong legacy in 8-bit microcontrollers and automotive electronics.
The 8XC51RA+ product line was designed specifically for cost-sensitive, high-volume industrial control applications requiring enhanced peripherals over baseline 80C51 - including PCA for motor control, hardware WDT for fail-safe operation, and low-voltage operation for battery-backed systems.
FAQ
What is the maximum operating frequency of the P87C51RA+4A,512?
The P87C51RA+4A,512 supports a maximum clock frequency of 16 MHz under its specified 2.7 V to 5.5 V operating voltage range. This corresponds to approximately 1.33 million instructions per second (MIPS) assuming a 12-clock-per-instruction execution model. The device is not rated for 33 MHz operation - that specification applies only to the higher-voltage 5 V-only variants denoted with "IN", "IA", or "IB" suffixes, not the "4A" variant.
Does the P87C51RA+4A,512 include a hardware watchdog timer?
Yes, the P87C51RA+4A,512 integrates a hardware watchdog timer as a standard feature. This is confirmed in the product specification table comparing device families: the 80C51RA+/8XC51RA+ series explicitly lists "Yes" for Hardware Watch Dog Timer, distinguishing it from earlier 8XC54/58 and 80C51FA variants which omit this function. The WDT enhances system reliability in unattended industrial deployments.
What package type does the P87C51RA+4A,512 use?
The P87C51RA+4A,512 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, identified in Philips' ordering information as SOT187-2. This surface-mount package features J-leads for robust mechanical attachment and thermal performance, and is distinct from the 40-pin DIP (SOT129-1) and 44-pin QFP (SOT307-2) variants offered in the same family.
How much RAM does the P87C51RA+4A,512 provide?
The P87C51RA+4A,512 provides 512 bytes of on-chip RAM, as documented in the memory comparison table within the Philips product specification. This doubles the 256-byte RAM found in earlier 8XC54/58 and 80C51FA devices, enabling larger stack usage, more complex interrupt service routines, and expanded data buffering - particularly valuable in communication-intensive applications.
Is the P87C51RA+4A,512 pin-compatible with other members of the 8XC51RA+ family?
Yes, the P87C51RA+4A,512 is pin-compatible with other 44-pin PLCC variants in the 8XC51RA+/RB+/RC+/RD+ family, including P87C51RB+4A, P87C51RC+4A, and P87C51RD+4A. All share identical pin functions, electrical characteristics, and package dimensions (SOT187-2), enabling direct substitution where increased program memory capacity is required without PCB redesign.
P87C51RA+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:
- 8KB (8K 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:
P87C51RA+4A,512 FAQ
1.How can I place an order for P87C51RA+4A,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RA+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 P87C51RA+4A,512 reliable?
The price and inventory of P87C51RA+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 P87C51RA+4A,512 is usually 5 days.
3.What payment methods are accepted for P87C51RA+4A,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RA+4A,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RA+4A,512?
P87C51RA+4A,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RA+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 P87C51RA+4A,512?
For technical support, including P87C51RA+4A,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RA+4A,512 requirements.
6.How does Aetrix verify that P87C51RA+4A,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RA+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 P87C51RA+4A,512 meets industry standards.
7.What is the process for return or replacement of P87C51RA+4A,512?
All P87C51RA+4A,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RA+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 P87C51RA+4A,512 part is unused and in its original packaging.
Return procedure for P87C51RA+4A,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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