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NXP Semiconductors P87C51FA-4N,112
- Part No.:
- P87C51FA-4N,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
P87C51FA-4N,112.pdf
- Description:
- IC MCU 8BIT 8KB OTP 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,741
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Product details
Overview
P87C51FA-4N,112 from Philips Semiconductors is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 8 KB on-chip program memory, 256 bytes RAM, programmable PCA (Programmable Counter Array), and full-duplex enhanced UART. It operates at up to 16 MHz across 2.7–5.5 V supply, supporting industrial control, motor drive timing, and embedded instrumentation.
For engineers reviewing the P87C51FA-4N,112 datasheet, P87C51FA-4N,112 pinout, P87C51FA-4N,112 application, or P87C51FA-4N,112 equivalent, this device requires attention to its 40-pin DIP package, PCA-based PWM capability, dual timer/counter interrupt sources, and compatibility with legacy 80C51 toolchains and peripheral drivers.
Technical Context
The P87C51FA-4N,112 implements a static CMOS 80C51 core with instruction-set compatibility and architectural enhancements including a 5-channel PCA for capture/compare/PWM generation, four 8-bit I/O ports, and three 16-bit timers. Its enhanced UART supports framing error detection and automatic address recognition for multiprocessor communication.
It supports low-power operation via Idle and Power-Down modes, with clock stop capability and internal pull-ups on all I/O ports. The device uses external crystal or ceramic resonator via XTAL1/XTAL2, and includes security bits (3-bit OTP protection) and 64-byte encryption array for code confidentiality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with static design enabling 0–16 MHz operation |
| Memory | 8 KB OTP program memory + 256 B RAM; supports up to 64 KB external addressing |
| PCA Channels | 5-channel Programmable Counter Array (CEX0–CEX4) for PWM, capture, and high-speed I/O |
| UART | Full-duplex enhanced UART with framing error detection and automatic address recognition |
| Power Supply | 2.7–5.5 V operation; supports single-supply battery or regulated rail designs |
| Interrupts | 4-level priority nested interrupt structure with 6 sources (INT0, INT1, T0, T1, RxD, PCA) |
| Package | 40-pin Plastic Dual In-line Package (SOT129-1), lead-free compliant per datasheet revision |
Pinout & Package
40-pin PDIP (Plastic Dual In-line Package), SOT129-1 footprint, 0.6-inch width, through-hole mount. Pin 1 = T2/P1.0; Pin 40 = VCC; Pin 20 = VSS; no internal connection on pins marked NIC in alternate packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 (39–32) | Multiplexed AD bus / Port 0 | Open-drain I/O; serves as low-order address/data bus during external memory access; requires external pull-ups |
| P1.0–P1.7 (1–8) | General-purpose I/O with PCA functions | Internal pull-ups; P1.0/T2 and P1.1/T2EX support Timer2; P1.2–P1.7 map to CEX0–CEX4 PCA channels |
| P2.0–P2.7 (21–28) | High-order address bus / Port 2 | Drives A8–A15 during 16-bit external memory access; emits P2 register value during 8-bit MOVX @Ri |
| P3.0–P3.7 (10–17) | Secondary function I/O port | RxD/TxD (serial), INT0/INT1 (external interrupts), T0/T1 (timer inputs), WR/RD (memory strobes) |
| RST (9) | Reset input | Active-high reset requiring ≥2 machine cycles (24 oscillator periods); internal pull-down enables power-on reset with RC network |
| XTAL1 (19), XTAL2 (18) | Oscillator interface | XTAL1 accepts external clock or crystal input; XTAL2 outputs inverted clock signal; supports 0–16 MHz crystals |
| EA/VPP (31) | External access enable | Low = execute from external ROM; high = execute from internal OTP up to 8 KB; also receives 12.75 V during programming |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Clock-Out | Configurable output on P1.0/T2 pin enables system clock distribution without external oscillator |
| Second DPTR Register | DPS bit allows fast switching between two data pointer registers for efficient external memory block transfers |
| Asynchronous Port Reset | Ports 1–3 drive to known state asynchronously upon RST assertion, improving system reliability during brown-out |
| Low EMI Mode | ALE inhibition via AUXR.0 reduces electromagnetic emissions during high-noise industrial operation |
| Security Bits | 3-bit OTP lock prevents unauthorized readout of program memory and disables EA bypass during debug |
Applications
| Motor Control System | Industrial PLC I/O Module |
|---|---|
Use Scenario: Closed-loop DC motor speed regulation using feedback from encoder and real-time PWM output. IC Role / Device Role / Timing Role: Primary controller executing PID algorithm, generating 16-bit resolution PWM via PCA channels CEX0–CEX2, and handling quadrature decode via INT0/INT1 edge-triggered interrupts. Use Value: Enables precise 10–20 kHz PWM carrier frequency with <1 µs jitter, meeting IEC 61800-3 EMC requirements for variable-frequency drives. | Use Scenario: Standalone digital I/O expansion node communicating over RS-485 with master PLC. IC Role / Device Role / Timing Role: Protocol handler and I/O scheduler managing 16-channel opto-isolated inputs/outputs, buffering serial commands, and maintaining deterministic response latency. Use Value: Full-duplex UART with automatic address recognition allows multi-drop RS-485 networks without software address filtering overhead. |
| Energy Meter Firmware Loader | Legacy Equipment Retrofit Controller |
Use Scenario: Field-upgradable firmware loader for electromechanical energy meters using infrared or RS-232 interface. IC Role / Device Role / Timing Role: Secure bootloader verifying signed firmware images stored in external SPI flash, then programming internal OTP via ISP-like sequence. Use Value: 3-bit security lock and 64-byte encryption array prevent cloning and ensure only authorized firmware executes. | Use Scenario: Drop-in replacement for obsolete 8031/8051 controllers in aging test equipment with minimal PCB modification. IC Role / Device Role / Timing Role: Pin- and code-compatible upgrade providing same instruction timing, memory map, and interrupt vector layout while adding PCA-based pulse counting. Use Value: Maintains backward compatibility with existing assembly code and hardware interfaces while enabling new high-speed event capture functionality. |
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-4N,112 | 16 KB OTP memory; identical pinout, clock, and peripheral set | Supports larger firmware images without external memory expansion | Select when application firmware exceeds 8 KB and external memory access must be avoided |
| P87C51RA+-4N,112 | 8 KB OTP + 512 B RAM + hardware watchdog timer; same PCA and UART features | Required for safety-critical systems needing periodic reset supervision | Select when IEC 61508 or UL 60730 compliance mandates independent watchdog monitoring |
Compared with P87C51FA-4N,112, P87C51FB-4N,112 offers double program memory without changing layout or firmware timing, while P87C51RA+-4N,112 adds watchdog capability essential for fail-safe embedded control-both retain full 80C51 code compatibility and share the same 40-pin DIP footprint.
Availability
P87C51FA-4N,112 is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy equipment retrofit requiring stable component supply, long-lifecycle assurance, and RoHS-compliant through-hole packaging.
Supply support for P87C51FA-4N,112 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 pioneer in 8-bit microcontroller innovation, delivering robust, industry-proven ICs for automotive, industrial, and consumer applications since the 1980s.
The 8XC51FA family was designed specifically for cost-sensitive, high-reliability embedded control systems requiring OTP security, extended voltage range, and enhanced peripherals beyond baseline 8051-targeting motor drives, power supplies, and instrumentation.
FAQ
What is the maximum operating frequency of the P87C51FA-4N,112?
The P87C51FA-4N,112 supports a maximum crystal frequency of 16 MHz, yielding a 2-MHz internal instruction cycle rate (12-clock mode). It is not rated for 33 MHz operation-that specification applies only to the higher-voltage P87C51FA-IN variant. Operating above 16 MHz may cause timing violations in the PCA or UART modules.
Does the P87C51FA-4N,112 include a hardware watchdog timer?
No, the P87C51FA-4N,112 does not integrate a hardware watchdog timer. That feature is present only in the P87C51RA+/RB+/RC+ variants. For watchdog functionality with the P87C51FA-4N,112, an external supervisor IC such as the MAX813L or equivalent must be used in conjunction with the RST pin.
How is program memory protected on the P87C51FA-4N,112?
The P87C51FA-4N,112 uses three OTP security bits to disable external readout of program memory and prevent EA pin override during debugging. Once programmed, these bits permanently lock the OTP contents-no factory or field reprogramming is possible without erasing the entire chip, which destroys the code.
Can the P87C51FA-4N,112 operate from a 3.3 V supply?
Yes, the P87C51FA-4N,112 is fully specified for 2.7–5.5 V operation, making it compatible with 3.3 V systems. At 3.3 V, maximum operating frequency is reduced to 10 MHz per datasheet limits; all I/O pins remain 5 V tolerant when configured as inputs, simplifying level-shifting in mixed-voltage designs.
What development tools support the P87C51FA-4N,112?
The P87C51FA-4N,112 is supported by Keil µVision2/3 (C51 compiler v7.x+), SDCC open-source toolchain, and Philips/NXP FlashMagic for ISP programming. Hardware debuggers include the Philips UOC-51 and third-party 8051 ICE units compatible with standard 80C51 JTAG or on-chip debug interfaces.
P87C51FA-4N,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
P87C51FA-4N,112 FAQ
1.How can I place an order for P87C51FA-4N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for P87C51FA-4N,112 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-4N,112 reliable?
The price and inventory of P87C51FA-4N,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for P87C51FA-4N,112 is usually 5 days.
3.What payment methods are accepted for P87C51FA-4N,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P87C51FA-4N,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P87C51FA-4N,112?
P87C51FA-4N,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P87C51FA-4N,112 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-4N,112?
For technical support, including P87C51FA-4N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P87C51FA-4N,112 requirements.
6.How does Aetrix verify that P87C51FA-4N,112 is sourced from the original manufacturer or authorized distributors?
All P87C51FA-4N,112 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-4N,112 meets industry standards.
7.What is the process for return or replacement of P87C51FA-4N,112?
All P87C51FA-4N,112 units undergo pre-shipment inspection (PSI). If there is an issue with P87C51FA-4N,112, 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-4N,112 part is unused and in its original packaging.
Return procedure for P87C51FA-4N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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