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NXP Semiconductors P87C51FA-5A,512
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- Part No.:
- P87C51FA-5A,512
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
P87C51FA-5A,512.pdf
- Description:
- IC MCU 8BIT 8KB OTP 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,712
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Product details
Overview
P87C51FA-5A,512 from Philips Semiconductors is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 8 KB ROM, 256-byte RAM, a programmable PCA (Programmable Counter Array) with five capture/compare channels, full-duplex enhanced UART, and operation at up to 16 MHz across –40°C to +85°C. It targets industrial control, motor drive timing, and embedded instrumentation requiring deterministic I/O and pulse-width modulation.
For engineers reviewing the P87C51FA-5A,512 datasheet, P87C51FA-5A,512 pinout, P87C51FA-5A,512 application, or P87C51FA-5A,512 equivalent, this device delivers verified 80C51 instruction set compatibility, hardware watchdog-free timing control, and dual-package support (PLCC-44 & QFP-44) for legacy 8051-based system upgrades with extended peripheral capability.
Technical Context
The P87C51FA-5A,512 implements the standard 80C51 CPU core with full static operation and four priority-level interrupts. Its PCA module provides independent capture, compare, PWM, and high-speed counter functions using five dedicated I/O pins (P1.3–P1.7), enabling precise motor phase control and encoder signal processing without CPU intervention.
It supports external memory expansion up to 64 KB via multiplexed Port 0 (AD0–AD7) and Port 2 (A8–A15), with ALE/PROG output for address latching and EA/VPP pin controlling internal/external code fetch. The enhanced UART includes framing error detection and automatic address recognition for reliable multi-drop serial communication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with identical instruction set and register map |
| Memory Configuration | 8 KB on-chip OTP ROM + 256-byte RAM; supports 64 KB external program/data memory addressing |
| Max Clock Frequency | 16 MHz at 2.7–5.5 V supply - enables real-time response within 62.5 ns instruction cycle |
| PCA Channels | 5-channel Programmable Counter Array (CEX0–CEX4) for PWM, capture, compare, and up/down counting |
| UART Features | Full-duplex enhanced UART with framing error detection and automatic address recognition |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Power Modes | Idle mode (CPU halted, peripherals active) and Stop Clock mode (oscillator halted, RAM/SFR retained) |
Pinout & Package
Package: 44-pin Plastic Leaded Chip Carrier (PLCC), SOT187-2 footprint, lead-free compatible per Philips specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P1.3 / CEX0 | PCA Module 0 I/O | Capture/compare input/output for timer-based edge detection or PWM generation |
| P1.4 / CEX1 | PCA Module 1 I/O | Dedicated channel for independent PWM waveform synthesis or event timestamping |
| P1.5 / CEX2 | PCA Module 2 I/O | Enables three-phase motor commutation control with synchronized gate timing |
| P1.6 / CEX3 | PCA Module 3 I/O | Supports quadrature encoder input decoding with hardware position accumulation |
| P1.7 / CEX4 | PCA Module 4 I/O | Provides fourth independent PWM output or high-resolution pulse-width measurement |
| EA/VPP | External Access Enable | Low = execute from external memory; high = execute from internal ROM (8 KB limit) |
| ALE/PROG | Address Latch Enable | Outputs 1/6 oscillator frequency for external latch timing; doubles as EPROM programming pulse |
| P3.0 / RxD | Serial Input | Asynchronous UART receive input with framing error detection logic |
| P3.1 / TxD | Serial Output | Asynchronous UART transmit output supporting multi-processor communication protocol |
Key Features
| Feature | Design Value |
|---|---|
| PCA with 5 I/O channels | Enables simultaneous PWM generation, input capture, and high-speed counting without CPU overhead |
| Enhanced UART with auto-address recognition | Reduces firmware complexity in multi-node RS-485 networks by filtering addressed frames in hardware |
| Four priority-level nested interrupt structure | Guarantees deterministic response to time-critical events like encoder zero-crossing or fault signals |
| Full static CMOS design | Permits clock stoppage at any instruction boundary for ultra-low-power sleep states |
| Second DPTR register | Accelerates block memory transfers between internal RAM and external data space without software save/restore |
Applications
| Motor Control System | Industrial Data Logger |
|---|---|
Use Scenario: Closed-loop BLDC motor controller with Hall-effect sensor feedback and three-phase PWM output. IC Role / Device Role / Timing Role: Primary timing and I/O coordinator - generates synchronized PWM waveforms via PCA, captures Hall transitions, and manages UART telemetry. Use Value: Eliminates need for external PWM generator ICs; PCA channels deliver sub-microsecond timing resolution for precise commutation timing. | Use Scenario: Standalone environmental monitor logging temperature, humidity, and voltage readings to SPI EEPROM over 24-hour cycles. IC Role / Device Role / Timing Role: System controller executing low-power duty cycling - wakes on RTC interrupt, samples sensors, stores data, then re-enters idle mode. Use Value: Idle mode reduces average current to <100 µA while preserving RAM contents and peripheral state between wake cycles. |
| RS-485 Multi-Drop Node | Legacy Equipment Interface Adapter |
Use Scenario: Field device node in factory automation network communicating via RS-485 with master PLC. IC Role / Device Role / Timing Role: Protocol handler - filters addressed packets using UART auto-recognition, parses Modbus RTU frames, and controls local I/O. Use Value: Hardware address filtering offloads 30–40% of CPU cycles otherwise spent on frame pre-processing in software. | Use Scenario: Retrofit adapter bridging analog 4–20 mA sensors to modern CAN bus systems using discrete level-shifting and signal conditioning. IC Role / Device Role / Timing Role: Real-time interface translator - reads analog inputs via external ADC, formats data, and transmits via UART to CAN controller IC. Use Value: On-chip 80C51 instruction compatibility ensures drop-in replacement for aging 8051-based designs without firmware rewrite. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| P87C51FB-5A,512 | 16 KB OTP ROM instead of 8 KB; identical pinout, PCA, UART, and package | Required when firmware exceeds 8 KB or future expansion headroom is needed | Select when larger code space is confirmed necessary; no PCB or firmware changes required |
| P87C51RA+-5A,512 | 512-byte RAM (vs. 256), integrated hardware watchdog timer, same 8 KB OTP and PCA features | Suitable for safety-critical applications requiring periodic reset supervision | Choose when watchdog functionality is mandatory; requires minor SFR initialization update |
Compared with P87C51FA-5A,512, the P87C51FB-5A,512 offers double program memory without altering timing or I/O behavior, while the P87C51RA+-5A,512 adds watchdog reliability at the cost of slightly higher active current - both retain full pin and code compatibility for seamless migration.
Availability
P87C51FA-5A,512 is available at Aetrix Electronics and suitable for industrial control, motor drive subsystems, and legacy equipment modernization requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for P87C51FA-5A,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 Dutch semiconductor company founded in 1953, specializing in analog, logic, and microcontroller solutions for industrial and automotive markets.
The 8XC51FA family was designed specifically to extend the 80C51 platform with enhanced peripherals - notably the PCA - for motion control, power conversion, and deterministic real-time I/O in cost-sensitive embedded systems.
FAQ
What is the maximum operating frequency of the P87C51FA-5A,512?
The P87C51FA-5A,512 operates at up to 16 MHz across its full voltage range (2.7 V to 5.5 V) and temperature range (–40°C to +85°C). This frequency is validated per Philips specification document 8XC51FA/FB/FC/80C51FA, with timing parameters guaranteed under worst-case conditions. The P87C51FA-5A,512 does not support the 33 MHz variant - that rating applies only to the 'U' speed grade (e.g., P87C51FA-IA).
Does the P87C51FA-5A,512 include a hardware watchdog timer?
No, the P87C51FA-5A,512 does not integrate a hardware watchdog timer. Watchdog functionality is introduced in the later 8XC51RA+/RB+/RC+/RD+ family (e.g., P87C51RA+-5A,512). The P87C51FA-5A,512 relies on software-based timeout supervision or external watchdog ICs. All SFRs related to watchdog control (e.g., WDTRST) are absent from the P87C51FA-5A,512 register map.
Which packages are supported for the P87C51FA-5A,512?
The P87C51FA-5A,512 is specified in two packages: 44-pin Plastic Leaded Chip Carrier (PLCC, SOT187-2) and 44-pin Plastic Quad Flat Pack (QFP, SOT307-2). The '-5A' suffix explicitly denotes the PLCC variant per Philips ordering information tables; the QFP version uses the '-5B' suffix (e.g., P87C51FA-5B,512). Both share identical electrical characteristics and pin functions.
How much internal RAM does the P87C51FA-5A,512 provide?
The P87C51FA-5A,512 provides 256 bytes of on-chip RAM, consistent with the base 80C51 architecture and documented in the memory configuration table of the Philips product specification. This RAM is directly addressable and retains data during Idle mode. Unlike the P87C51RA+ series (which offers 512 bytes), the P87C51FA-5A,512 does not support RAM expansion beyond 256 bytes via SFR banking.
Is the P87C51FA-5A,512 pin-compatible with standard 8051 microcontrollers?
Yes, the P87C51FA-5A,512 maintains full pin-to-pin compatibility with industry-standard 44-pin 8051 derivatives in PLCC and QFP packages, including shared Port 0–3 assignments, RST, XTAL1/XTAL2, EA/VPP, ALE/PROG, and PSEN. Its additional PCA functions (CEX0–CEX4) are mapped to P1.3–P1.7 - pins unused in basic 8051 designs - ensuring backward compatibility without layout changes.
P87C51FA-5A,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
- Number of I/O:
- 32
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- OTP
- EEPROM Size:
- -
- RAM Size:
- 256 x 8
- Voltage - Supply (Vcc/Vdd):
- 2.7V ~ 5.5V
- Data Converters:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
P87C51FA-5A,512 FAQ
1.How can I place an order for P87C51FA-5A,512 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51FA-5A,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 P87C51FA-5A,512 reliable?
The price and inventory of P87C51FA-5A,512 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51FA-5A,512 is usually 5 days.
3.What payment methods are accepted for P87C51FA-5A,512?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51FA-5A,512 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51FA-5A,512?
P87C51FA-5A,512 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51FA-5A,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 P87C51FA-5A,512?
For technical support, including P87C51FA-5A,512 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51FA-5A,512 requirements.
6.How does Aetrix verify that P87C51FA-5A,512 is sourced from the original manufacturer or authorized distributors?
All P87C51FA-5A,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 P87C51FA-5A,512 meets industry standards.
7.What is the process for return or replacement of P87C51FA-5A,512?
All P87C51FA-5A,512 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51FA-5A,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 P87C51FA-5A,512 part is unused and in its original packaging.
Return procedure for P87C51FA-5A,512:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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