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NXP Semiconductors P80C51FA-4N,112
- Part No.:
- P80C51FA-4N,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Microcontrollers
- Package:
- 40-DIP (0.600", 15.24mm)
- Datasheet:
-
P80C51FA-4N,112.pdf
- Description:
- IC MCU 8BIT ROMLESS 40DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,515
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Product details
Overview
P80C51FA-4N,112 from Philips Semiconductors is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 8 KB ROM, 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, supports four 8-bit I/O ports, three 16-bit timers, and nested 4-level priority interrupts - deployed in industrial motor control and embedded instrumentation systems.
For engineers reviewing the P80C51FA-4N,112 datasheet, P80C51FA-4N,112 pinout, P80C51FA-4N,112 application, or P80C51FA-4N,112 equivalent, key selection criteria include its 8 KB OTP memory size, PCA-based PWM/capture capability, dual DPTR support, asynchronous port reset, and low-EMI ALE inhibit - all critical for real-time I/O timing and legacy 8051 code migration.
Technical Context
The P80C51FA-4N,112 implements a static CMOS 80C51-compatible core with architectural enhancements including a 5-channel PCA module supporting capture, compare, PWM, and high-speed counting. Its enhanced UART provides framing error detection and automatic address recognition for multiprocessor communication.
It features full static operation down to 0 Hz, power control modes (Idle, Power Down, Stop Clock), and security bits (3 OTP encryption bits + 64-byte encryption array). The device uses standard TTL-compatible external memory expansion up to 64 KB and retains register state during low-power modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 80C51-compatible 8-bit CPU with identical instruction set and SFR mapping |
| Memory (ROM/OTP) | 8 KB on-chip OTP - enables secure, one-time-programmable firmware storage without external EPROM |
| RAM | 256 bytes internal RAM - sufficient for small real-time control stacks and data buffers |
| Max Clock Frequency | 16 MHz - supports deterministic timing for motor commutation and sensor sampling at ≤62.5 ns instruction cycle |
| Operating Voltage | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V system rails, easing mixed-voltage board design |
| PCA Channels | 5-channel Programmable Counter Array - enables simultaneous PWM generation, input capture, and event counting without CPU overhead |
| Interrupt Structure | 4-level nested priority with 7 interrupt sources - ensures deterministic response to time-critical events like encoder edges or fault signals |
| UART | Enhanced full-duplex UART with framing error detection and auto-address recognition - simplifies RS-485 multidrop network implementation |
Pinout & Package
Package: 40-pin Plastic Dual In-line Package (DIP), SOT129-1, lead-free per RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| P0.0–P0.7 | Open-drain bidirectional I/O / AD0–AD7 | Multiplexed address/data bus for external memory access; requires external pull-ups for strong logic-high drive |
| P1.0–P1.7 | Bidirectional I/O with internal pull-ups | Includes PCA functions: T2, T2EX, ECI, CEX0–CEX4 - used for PWM output, encoder input, or pulse capture |
| P2.0–P2.7 | Bidirectional I/O / A8–A15 | Provides high-order address byte during 16-bit external memory accesses (e.g., MOVX @DPTR) |
| P3.0–P3.7 | Bidirectional I/O with alternate functions | RxD/TxD (serial), INT0/INT1 (external interrupts), T0/T1 (timer inputs), WR/RD (memory strobes) |
| RST | Active-high reset input | Requires ≥2 machine cycles (24 oscillator periods) high pulse; internal weak pull-down allows RC-based power-on reset |
| XTAL1/XTAL2 | Oscillator input/output | Supports crystal (1–16 MHz) or external clock source; enables precise timing for UART baud rate generation |
| EA/VPP | External Access Enable / Programming voltage | Low = execute from external program memory; high = execute from internal OTP (8 KB limit); VPP = 12.75 V for programming |
| ALE/PROG | Address Latch Enable / Programming pulse | Emits 1/6 oscillator frequency for external latch sync; doubles as EPROM programming pulse; disable via AUXR.0 |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Clock-Out | Configurable output on P1.0 (T2) enables synchronous clock distribution to peripherals without external oscillator |
| Second DPTR Register | Enables efficient indirect addressing of multiple external memory banks - reduces instruction count in data-movement routines |
| Asynchronous Port Reset | Ports 1–3 enter known state immediately upon RST assertion - eliminates floating I/O during startup sequencing |
| Low-EMI ALE Inhibit | ALE can be disabled via SFR to reduce radiated emissions in noise-sensitive analog or RF-adjacent designs |
| Security Bits & Encryption | 3 OTP security bits + 64-byte encryption array prevent firmware reverse engineering and unauthorized cloning |
| Power Control Modes | Stop Clock, Idle, and Power Down modes allow dynamic power scaling - critical for battery-operated instrumentation |
Applications
| Industrial Motor Control | Embedded Data Logger |
|---|---|
Use Scenario: Closed-loop BLDC motor commutation using hall-effect sensors and PWM-driven gate drivers. IC Role / Device Role / Timing Role: Real-time execution of commutation logic, 5-channel PCA generating synchronized 3-phase PWM with dead-time insertion, and UART telemetry reporting. Use Value: Eliminates need for external PWM generator or FPGA; deterministic 16 MHz timing ensures ±1° electrical angle accuracy in rotor position tracking. | Use Scenario: Standalone environmental sensor node recording temperature, humidity, and pressure at 10 Hz with local SD card storage. IC Role / Device Role / Timing Role: Sensor interface controller (via I/O and timers), SPI master for SD card, UART host interface, and low-power scheduler managing sleep/wake cycles. Use Value: 256-byte RAM + 8 KB OTP holds firmware and circular buffer; Power Down mode extends battery life to >1 year on two AA cells. |
| Legacy Industrial PLC I/O Module | RS-485 Fieldbus Node |
Use Scenario: Retrofit replacement for aging 8051-based digital I/O expansion modules in factory automation cabinets. IC Role / Device Role / Timing Role: Bit-banged parallel I/O expansion with interrupt-driven status change detection on P1/P3 pins; watchdog supervision of fieldbus communication. Use Value: Pin-compatible upgrade path from obsolete 80C31/80C51; same PCB layout, no firmware rewrite needed due to 100% instruction-set compatibility. | Use Scenario: Slave node in Modbus RTU network collecting analog inputs and controlling relay outputs. IC Role / Device Role / Timing Role: UART controller with automatic address recognition and framing error detection; handles Modbus CRC calculation and response timing. Use Value: Enhanced UART eliminates external address decoder logic; 4-level interrupt prioritization ensures timely response to broadcast commands while servicing local I/O. |
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-4N | Same 8 KB OTP, 256B RAM, PCA, and package - but manufactured with newer OTP process offering improved data retention (>10 years @ 85°C) | No functional difference; validated drop-in replacement in all existing P80C51FA-4N designs | Select when long-term firmware reliability in high-temp environments is required |
| P80C51RA+-4N | 512B RAM, hardware watchdog timer, and 8 KB ROM - lacks PCA but adds WDT and larger RAM for more complex state machines | Suitable for applications needing robust fault recovery (e.g., safety interlocks) but not PCA-based PWM or capture | Choose when watchdog supervision outweighs PCA functionality, and firmware size permits 8 KB ROM usage |
Compared with P87C51FA-4N, the P80C51FA-4N,112 offers proven field reliability with mature OTP process, while P80C51RA+-4N trades PCA capability for watchdog and RAM - making P80C51FA-4N,112 optimal for cost-sensitive, timing-critical motor and instrumentation roles where PCA is essential.
Availability
P80C51FA-4N,112 is available at Aetrix Electronics and suitable for industrial motor control, embedded data logging, and legacy PLC I/O modules requiring stable component supply and long-lifecycle support.
Supply support for P80C51FA-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 high-reliability, automotive-qualified ICs since the 1980s.
The 80C51FA family was designed specifically for industrial control applications demanding OTP security, extended voltage range, and enhanced peripheral timing - bridging legacy 8051 ecosystems with modern power and interface requirements.
FAQ
What is the maximum operating frequency of the P80C51FA-4N,112?
The P80C51FA-4N,112 supports a maximum clock frequency of 16 MHz. This is specified for the full 2.7–5.5 V operating voltage range and enables a 62.5 ns instruction cycle time for time-critical tasks such as motor phase switching or high-speed sensor sampling. The device remains fully static - meaning it tolerates 0 Hz clock stoppage without data loss.
Does the P80C51FA-4N,112 include a hardware watchdog timer?
No, the P80C51FA-4N,112 does not include a hardware watchdog timer. That feature is present in the later 80C51RA+/RB+ family (e.g., P80C51RA+-4N) but omitted from the FA/FB/FC series. System-level watchdog functionality must be implemented externally or via software timer supervision using the PCA or Timer 2 modules in the P80C51FA-4N,112.
What package type and pin count does the P80C51FA-4N,112 use?
The P80C51FA-4N,112 uses a 40-pin Plastic Dual In-line Package (DIP), designated SOT129-1. It is lead-free and RoHS-compliant. This package matches the footprint of legacy 8051 devices, enabling direct replacement in existing through-hole industrial control boards without PCB redesign.
How much internal memory does the P80C51FA-4N,112 have?
The P80C51FA-4N,112 integrates 8 KB of on-chip OTP (One-Time Programmable) program memory and 256 bytes of internal RAM. The OTP memory is non-volatile and secured with three dedicated security bits and a 64-byte encryption array, preventing unauthorized readout or duplication of firmware.
Can the P80C51FA-4N,112 interface with external memory, and what is the addressing limit?
Yes, the P80C51FA-4N,112 supports external program and data memory expansion up to 64 KB using its multiplexed P0 (AD0–AD7) and P2 (A8–A15) buses. When EA is held high, it executes from internal OTP up to 0x1FFF; beyond that address, it automatically fetches from external memory - enabling hybrid memory architectures for larger firmware or data tables.
P80C51FA-4N,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Package/Case:
- 40-DIP (0.600", 15.24mm)
- Series:
- 80C
- 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:
- -
- Program Memory Type:
- ROMless
- 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:
P80C51FA-4N,112 FAQ
1.How can I place an order for P80C51FA-4N,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for P80C51FA-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 P80C51FA-4N,112 reliable?
The price and inventory of P80C51FA-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 P80C51FA-4N,112 is usually 5 days.
3.What payment methods are accepted for P80C51FA-4N,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for P80C51FA-4N,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for P80C51FA-4N,112?
P80C51FA-4N,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your P80C51FA-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 P80C51FA-4N,112?
For technical support, including P80C51FA-4N,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your P80C51FA-4N,112 requirements.
6.How does Aetrix verify that P80C51FA-4N,112 is sourced from the original manufacturer or authorized distributors?
All P80C51FA-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 P80C51FA-4N,112 meets industry standards.
7.What is the process for return or replacement of P80C51FA-4N,112?
All P80C51FA-4N,112 units undergo pre-shipment inspection (PSI). If there is an issue with P80C51FA-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 P80C51FA-4N,112 part is unused and in its original packaging.
Return procedure for P80C51FA-4N,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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