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NXP Semiconductors P87C51RA+IA,512
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- Part No.:
- P87C51RA+IA,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51RA+IA,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,411
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Product details
Overview
P87C51RA+IA,512 from Philips Semiconductors is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 8 KB ROM, 512 bytes RAM, hardware watchdog timer, programmable counter array (PCA), and full-duplex enhanced UART. It operates at up to 33 MHz with 2.7–5.5 V supply and targets embedded control applications requiring pulse-width modulation, high-speed I/O, and multiprocessor serial communication.
For engineers reviewing the P87C51RA+IA,512 datasheet, P87C51RA+IA,512 pinout, P87C51RA+IA,512 application, or P87C51RA+IA,512 equivalent, key selection criteria include its 44-pin PLCC package, PCA-based capture/compare capability, dual DPTR support, asynchronous port reset, and low-EMI ALE inhibition - all critical for motor control, industrial automation, and legacy 8051 migration designs.
Technical Context
This device belongs to the 8XC51RA+/RB+/RC+/RD+ family, extending the 80C51 ISA with architectural enhancements including a 5-channel programmable counter array (PCA) supporting PWM, capture, compare, and software timers. Its interrupt structure supports four priority levels and seven sources, including PCA overflow and external interrupts on INT0/INT1.
The microcontroller integrates a second data pointer (DPTR), enhanced UART with framing error detection and automatic address recognition, and power management modes (Idle, Power Down, Stop Clock). It supports external memory expansion up to 64 KB via multiplexed AD0–AD7 and A8–A15 buses, with Port 0 and Port 2 serving dual roles as I/O and address/data lines.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with identical instruction set and timing |
| Memory Size | 8 KB OTP program memory + 512 bytes on-chip RAM |
| Max Clock Frequency | 33 MHz at 5 V - enables 12-cycle-per-instruction execution at ~2.75 MIPS |
| Operating Voltage | 2.7–5.5 V - supports battery-powered and mixed-voltage system integration |
| Watchdog Timer | Hardware WDT included - ensures reliable recovery from software lockups |
| PCA Channels | 5-channel programmable counter array - enables simultaneous PWM generation and input capture |
| UART Features | Enhanced full-duplex UART with framing error detection and automatic address recognition |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.0/T2 | Timer 2 external count input / clock output | Enables external event counting or precise clock signal generation |
| P1.1/T2EX | Timer 2 reload/capture/direction control | Supports auto-reload, edge-triggered capture, and bidirectional counter control |
| P1.2/ECI | External clock input to PCA | Allows PCA to operate from independent clock source for timing isolation |
| P1.3–P1.7/CEX0–CEX4 | PCA capture/compare I/O channels | Each pin supports PWM output, input capture, or software timer functions |
| RST | Reset input | Active-high reset requiring ≥2 machine cycles (24 oscillator periods) |
| P3.0/RxD & P3.1/TxD | Serial interface I/O | Full-duplex UART with framing error detection and multiprocessor addressing |
| XTAL1/XTAL2 | Crystal oscillator inputs | Supports crystal (1–33 MHz) or external clock drive on XTAL1 only |
Key Features
| Feature | Design Value |
|---|---|
| Second DPTR register | Enables efficient indirect addressing during table lookups or string operations without software save/restore overhead |
| Asynchronous port reset | Allows individual port latches to be reset independently of CPU state - improves I/O reliability during fault recovery |
| Low EMI ALE inhibition | Disabling ALE reduces electromagnetic emissions during high-noise industrial operation without affecting memory access |
| Programmable clock out | Generates precise system clock derivatives (e.g., for ADC sampling or peripheral sync) directly from internal oscillator |
| Four-level nested interrupt | Supports real-time prioritization across 7 interrupt sources including PCA overflow, UART, and external events |
Applications
| Motor Control System | Industrial PLC Module |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from encoder pulses and PWM-driven H-bridge. IC Role / Device Role / Timing Role: Primary controller executing PID algorithm, generating 16-bit PWM via PCA channels CEX0–CEX2, and capturing quadrature encoder edges on CEX3/CEX4. Use Value: Hardware PCA eliminates CPU polling overhead, enabling deterministic 100 µs control loop timing at 33 MHz clock. | Use Scenario: Standalone logic controller handling discrete I/O, analog monitoring, and Modbus RTU communication over RS-485. IC Role / Device Role / Timing Role: Central processing unit managing 16 digital inputs/outputs, reading 4-channel ADC via external interface, and implementing Modbus protocol stack in UART with automatic address recognition. Use Value: Enhanced UART reduces firmware complexity for multi-drop bus arbitration; 512-byte RAM accommodates protocol buffers and state tables. |
| Legacy Equipment Retrofit | Power Supply Monitor |
Use Scenario: Replacement for obsolete 80C51 variants in medical infusion pumps requiring safety-certified firmware updates. IC Role / Device Role / Timing Role: Drop-in architectural replacement with identical pinout (44-pin PLCC), retaining existing PCB layout while adding watchdog timer and low-voltage brown-out detection. Use Value: Hardware WDT and 2.7 V minimum operating voltage improve system resilience during battery depletion or line sags. | Use Scenario: Real-time monitoring of AC/DC converter rail voltages, temperature, and fan status in telecom rectifiers. IC Role / Device Role / Timing Role: Supervisor MCU sampling analog sensors via external ADC, logging events to EEPROM, and triggering shutdown via GPIO when thresholds exceeded. Use Value: Dual DPTR enables concurrent access to sensor data tables and EEPROM command sequences without register bank switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51FA-IA | Same 44-pin PLCC package and 33 MHz max frequency, but only 256 bytes RAM and no hardware watchdog timer | Lacks WDT and PCA - unsuitable for safety-critical or PWM-intensive applications | Select only if cost sensitivity outweighs need for watchdog or advanced timing features |
| P89C51RD2FA | Flash-based 80C51 derivative with 64 KB flash, 1 KB RAM, and ISP capability; same PLCC-44 package | Enables field firmware updates and larger code storage, but requires different programming infrastructure | Prefer for new designs requiring reprogrammability or extended memory, not for direct replacement |
Compared with P87C51FA-IA, the P87C51RA+IA,512 adds 256 bytes RAM and hardware WDT - essential for robust real-time control; versus P89C51RD2FA, it trades flash flexibility for OTP security and simpler production programming, making it optimal for fixed-function, high-volume embedded systems.
Availability
P87C51RA+IA,512 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, legacy equipment retrofits, and power supply monitors requiring stable component supply across extended product lifecycles.
Supply support for P87C51RA+IA,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 specializing in high-reliability, industrial-grade ICs with strong heritage in 8-bit microcontroller innovation.
The 8XC51RA+ family was designed specifically for cost-sensitive, high-volume embedded control applications demanding enhanced timing precision, low-power operation, and backward compatibility with legacy 8051 toolchains and hardware designs.
FAQ
What is the maximum operating frequency of the P87C51RA+IA,512?
The P87C51RA+IA,512 supports a maximum clock frequency of 33 MHz when operated at 5 V. At this speed, it delivers approximately 2.75 million instructions per second (MIPS) under typical 12-cycle-per-instruction execution. The device maintains full functionality across its specified voltage range (2.7–5.5 V), though maximum frequency is reduced at lower supply voltages per the manufacturer's AC characteristics table.
Does the P87C51RA+IA,512 include a hardware watchdog timer?
Yes, the P87C51RA+IA,512 includes a dedicated hardware watchdog timer - a key differentiator from earlier 8XC51FA/FB/FC variants. This feature is explicitly confirmed in the family comparison table and functional description, enabling autonomous system recovery from software hangs without external components. The watchdog is controlled via the PCON register and can be enabled/disabled in firmware.
What package type does the P87C51RA+IA,512 use, and is it RoHS-compliant?
The P87C51RA+IA,512 uses a 44-pin Plastic Leaded Chip Carrier (PLCC) package, designated SOT187-2 in Philips documentation. While the original 2000 datasheet predates RoHS legislation, current Aetrix Electronics inventory complies with EU RoHS Directive 2011/65/EU and REACH SVHC requirements, verified through supplier declarations and material testing reports for this specific orderable part.
How many PCA channels does the P87C51RA+IA,512 support, and what functions do they enable?
The P87C51RA+IA,512 supports five PCA channels (CEX0–CEX4), each configurable for PWM generation, input capture, software timer, or high-speed output toggle. These channels are mapped to Port 1 pins P1.3–P1.7 and are controlled via dedicated SFRs including CCAPM0–CCAPM4 and CCON. This capability enables simultaneous motor control, encoder counting, and time-stamped event logging without CPU intervention.
Can the P87C51RA+IA,512 execute code from external memory, and what addressing modes are supported?
Yes, the P87C51RA+IA,512 can execute code from external program memory when the EA/VPP pin is held low. It supports both 8-bit (MOV @Ri) and 16-bit (MOVX @DPTR) external data memory addressing, with Port 0 providing AD0–AD7 and Port 2 providing A8–A15. The device can address up to 64 KB of external program and data memory, maintaining full compatibility with standard TTL-compatible memory interfaces.
P87C51RA+IA,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:
- 33MHz
- 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):
- 4.5V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51RA+IA,512 FAQ
1.How can I place an order for P87C51RA+IA,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51RA+IA,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+IA,512 reliable?
The price and inventory of P87C51RA+IA,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+IA,512 is usually 5 days.
3.What payment methods are accepted for P87C51RA+IA,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51RA+IA,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51RA+IA,512?
P87C51RA+IA,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51RA+IA,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+IA,512?
For technical support, including P87C51RA+IA,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51RA+IA,512 requirements.
6.How does Aetrix verify that P87C51RA+IA,512 is sourced from the original manufacturer or authorized distributors?
All P87C51RA+IA,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+IA,512 meets industry standards.
7.What is the process for return or replacement of P87C51RA+IA,512?
All P87C51RA+IA,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51RA+IA,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+IA,512 part is unused and in its original packaging.
Return procedure for P87C51RA+IA,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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