NXP Semiconductors P87C51RC2FN,112

Overview

P87C51RC2FN,112 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 32 KB on-chip OTP program memory, 512 B RAM, four 8-bit I/O ports, three 16-bit timers (T0/T1/T2), a full-duplex enhanced UART with framing error detection, and a programmable counter array (PCA) supporting PWM and capture/compare functions. It operates from 2.7 V to 5.5 V at up to 33 MHz in 12-clock mode and targets motor control, industrial automation, and embedded instrumentation requiring high-speed I/O and precise timing.

For engineers reviewing the P87C51RC2FN,112 datasheet, P87C51RC2FN,112 pinout, P87C51RC2FN,112 application, or P87C51RC2FN,112 equivalent, this page delivers verified technical context, package-specific pin mapping for DIP40, real-world application scenarios, and validated alternative parts - all grounded in the official 2003 Philips product data sheet.

Technical Context

The P87C51RC2FN,112 implements a static CMOS 80C51 core with 100% instruction set compatibility and supports both 6-clock and 12-clock operation modes via OTP bit OX2 or SFR bit X2 (CKCON.0). Its enhanced peripheral set includes Timer 2 with capture/compare capability, PCA with five independent modules (CEX0–CEX4), and dual data pointers for efficient external memory access.

It integrates low-power features including Idle and Power-Down modes, asynchronous port reset, programmable clock-out on P1.0 (61 Hz–8 MHz range), and security bits with 64-byte encryption array. The device uses internal oscillator circuitry compatible with crystal or resonator inputs at XTAL1/XTAL2 and supports external memory expansion up to 64 KB ROM and 64 KB RAM.

Key Specifications

Pinout & Package

Package: 40-pin Plastic Dual In-Line Package (DIP40), SOT129-1, rated for –40 °C to +85 °C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit microcontroller applications.

Compared with AT89C51RC2-24PU, P87C51RC2FN,112 offers superior real-time control via PCA-based PWM and capture, while P89C51RD2FA extends memory headroom at the cost of footprint change - both alternatives retain 8051 software compatibility but differ in reprogrammability, memory size, and physical integration.

Availability

P87C51RC2FN,112 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, embedded data loggers, and power supply monitor units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for P87C51RC2FN,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

NXP Semiconductors, formerly Philips Semiconductors, designs high-reliability mixed-signal ICs for automotive, industrial, and consumer applications with emphasis on longevity and qualification rigor.

The P87C51RC2FN,112 belongs to the P87C51RA2/RB2/RC2/RD2 OTP microcontroller family, engineered for cost-sensitive, high-volume embedded control applications demanding deterministic timing, low power, and long-term supply stability - especially where Flash reprogramming is unnecessary.

FAQ

What is the maximum operating frequency of the P87C51RC2FN,112 and under what conditions?

The P87C51RC2FN,112 supports up to 33 MHz at VCC = 5 V in 12-clock mode and up to 30 MHz at VCC = 3 V. In 6-clock mode, it achieves equivalent throughput at half the oscillator frequency - e.g., 16.5 MHz crystal yields 33 MHz effective CPU speed. These ratings assume operation within the specified –40 °C to +85 °C temperature range and proper decoupling per the 2003 Philips datasheet.

Does the P87C51RC2FN,112 support in-system programming or reprogramming after initial OTP programming?

No, the P87C51RC2FN,112 uses One-Time Programmable (OTP) memory - once programmed, the 32 KB code space cannot be erased or rewritten. Programming requires parallel programming hardware and the OX2 clock-mode bit must be set during this process. For reprogrammable alternatives, consider Flash-based derivatives like the AT89C51RC2-24PU.

How many capture/compare channels does the PCA module in the P87C51RC2FN,112 provide?

The P87C51RC2FN,112 includes a five-channel Programmable Counter Array (PCA), with dedicated pins CEX0 through CEX4 mapped to P1.3–P1.7. Each channel supports independent capture, compare, PWM, and software timer functions - enabling simultaneous motor phase control, encoder counting, and LED dimming without CPU intervention.

What package type and pin count does the P87C51RC2FN,112 use, and what is its temperature rating?

The P87C51RC2FN,112 is supplied in a 40-pin Plastic Dual In-Line Package (DIP40), SOT129-1, qualified for industrial temperature operation from –40 °C to +85 °C. This through-hole package supports prototyping, legacy board replacement, and applications requiring mechanical robustness and manual assembly compatibility.

Can the P87C51RC2FN,112 operate from a 3.3 V supply, and what are the implications for timing performance?

Yes, the P87C51RC2FN,112 operates across 2.7 V to 5.5 V. At 3.3 V, the maximum guaranteed frequency is 16 MHz in 12-clock mode (per datasheet Table on page 3), delivering ~1.33 MIPS. Performance scales linearly with voltage and clock mode - using 6-clock mode at 3.3 V allows up to 32 MHz oscillator input for equivalent 16 MHz throughput, maintaining compatibility with 3.3 V peripheral interfaces.