NXP Semiconductors P87C51RC2BN,112

Overview

P87C51RC2BN,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 at 2.7–5.5 V and supports both 6-clock and 12-clock modes for up to 30 MHz (6-clock) or 33 MHz (12-clock) operation - ideal for motor control and industrial embedded systems requiring precise timing and pulse-width modulation.

For engineers reviewing the P87C51RC2BN,112 datasheet, P87C51RC2BN,112 pinout, P87C51RC2BN,112 application, or P87C51RC2BN,112 equivalent, key selection criteria include its DIP40 package compatibility, OTP-based firmware immutability, dual clock mode flexibility, PCA-driven PWM capability, and support for low-voltage operation down to 2.7 V in industrial temperature range (0 °C to +70 °C).

Technical Context

The P87C51RC2BN,112 implements a static CMOS 80C51 core with 100% instruction set compatibility and extends it with hardware enhancements including Timer 2 (capture/compare), a 5-channel PCA module, and programmable clock-out via P1.0. Its dual clock mode (6- or 12-clock per machine cycle) is selectable either by OTP bit OX2 (via parallel programmer) or SFR bit X2 in CKCON, enabling performance scaling without hardware change.

It integrates power management features including Idle and Power-down modes, asynchronous port reset, and wake-up from Power-down via external interrupts (INT0/INT1). The enhanced UART supports automatic address recognition and framing error detection, while the PCA provides five independent capture/compare channels (CEX0–CEX4) and PWM outputs - all mapped to Port 1 pins with dedicated alternate functions.

Key Specifications

Pinout & Package

Package: 40-pin Plastic Dual In-Line Package (DIP40), SOT129-1 footprint, through-hole mountable, compatible with legacy 8051 development sockets and wave-soldering processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51RD2-24PU and P89C51RD2BN,112, the P87C51RC2BN,112 delivers optimal trade-off between OTP firmware security, PCA-driven PWM precision, and 32 KB code density - making it preferred for cost-sensitive, safety-aware industrial control where reprogramming is unnecessary.

Availability

P87C51RC2BN,112 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, legacy equipment retrofits, and power supply monitoring units requiring stable component supply, long-term obsolescence management, and verified DIP40 through-hole compatibility.

Supply support for P87C51RC2BN,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 is a global semiconductor leader delivering secure, energy-efficient, and scalable solutions for automotive, industrial, IoT, and communication infrastructure markets.

The P87C51RC2BN,112 belongs to NXP's legacy 80C51 OTP microcontroller family, designed specifically for cost-effective, high-reliability industrial control applications where firmware integrity, deterministic timing, and long-lifecycle support are essential.

FAQ

What is the maximum operating frequency of the P87C51RC2BN,112?

The P87C51RC2BN,112 supports up to 30 MHz in 6-clock mode and 33 MHz in 12-clock mode at VCC = 5 V. At 3 V, the maximum frequency is 16 MHz. These limits are guaranteed across the 0 °C to +70 °C operating temperature range and reflect actual silicon performance - not theoretical peak values. The P87C51RC2BN,112 achieves this via advanced CMOS process optimization and dual-clock architecture.

Does the P87C51RC2BN,112 support in-system programming (ISP)?

No, the P87C51RC2BN,112 does not support in-system programming. It uses one-time-programmable (OTP) memory programmed via parallel programming using a commercial programmer and the EA/VPP pin. Unlike Flash-based variants, the P87C51RC2BN,112 firmware cannot be erased or rewritten after initial programming - ensuring code integrity and preventing unauthorized modification.

How many PWM channels does the P87C51RC2BN,112 provide?

The P87C51RC2BN,112 provides five independent PWM-capable channels via its Programmable Counter Array (PCA): CEX0 through CEX4 on Port 1 pins. Each channel supports configurable duty cycle, frequency, and edge-aligned or center-aligned output. This capability is implemented in hardware and does not consume CPU cycles - a key advantage over software-timed PWM on basic 8051 derivatives.

What package type is used for the P87C51RC2BN,112?

The P87C51RC2BN,112 uses a 40-pin Plastic Dual In-Line Package (DIP40), designated SOT129-1. It is through-hole mountable, compatible with standard 0.6-inch DIP sockets, and matches the pinout of legacy 8051 devices - enabling straightforward replacement in existing designs without PCB revision.

Can the P87C51RC2BN,112 operate from a 3.3 V supply?

Yes, the P87C51RC2BN,112 supports a supply voltage range of 2.7 V to 5.5 V, making it fully compatible with 3.3 V systems. At 3.3 V, it operates up to 16 MHz (per datasheet specification), maintaining full functionality of all peripherals including the PCA, UART, and timers - ideal for mixed-voltage industrial interfaces where 3.3 V logic coexists with 5 V sensors or actuators.