NXP Semiconductors P87C51RC2FA,512

Overview

P87C51RC2FA,512 from NXP Semiconductors (formerly Philips) is a single-chip 8-bit microcontroller based on the 80C51 architecture, featuring 32 KB OTP program memory, 512-byte RAM, and operation across 2.7–5.5 V supply. It supports both 6-clock and 12-clock modes (up to 30 MHz at 6-clock / 33 MHz at 12-clock), includes three 16-bit timers, a full-duplex enhanced UART with framing error detection, and a programmable counter array (PCA) for PWM and capture/compare functions - used in motor control and industrial timing systems.

For engineers reviewing the P87C51RC2FA,512 datasheet, P87C51RC2FA,512 pinout, P87C51RC2FA,512 application, or P87C51RC2FA,512 equivalent, key selection criteria include OTP capacity, PCA-based PWM resolution, 6/12-clock mode flexibility, extended temperature range (–40°C to +85°C), and PLCC-44 package compatibility with legacy 80C51 toolchains and PCB footprints.

Technical Context

The P87C51RC2FA,512 implements an accelerated 80C51 CPU core with fully static CMOS design, enabling zero-frequency clock stoppage and low-power idle/power-down modes. Its dual-clock architecture allows software-selectable 6-clock (2× throughput vs standard 80C51) or factory-default 12-clock operation via CKCON.X2 bit or parallel-programmed OTP bit OX2.

It integrates four 8-bit I/O ports (P0–P3), a 16-bit Timer 2 with capture/compare and baud-rate generation capability, and a 5-channel Programmable Counter Array (PCA) supporting simultaneous PWM output, input capture, and high-speed up/down counting - all synchronized to the same clock source without CPU intervention.

Key Specifications

Pinout & Package

Package: Plastic Leaded Chip Carrier (PLCC), 44-pin, SOT187-2 footprint, lead-free compatible, operating temperature –40°C to +85°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51RD2-RL24 and P89V51RD2FA, the P87C51RC2FA,512 offers deterministic OTP execution, lower power in idle mode, and dedicated PCA hardware - making it optimal for cost-sensitive, high-reliability motor control where firmware immutability and precise timing are critical.

Availability

P87C51RC2FA,512 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, legacy equipment upgrades, and power supply monitoring units requiring stable component supply, long-term lifecycle assurance, and drop-in compatibility with existing 80C51 designs.

Supply support for P87C51RC2FA,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

NXP Semiconductors acquired Philips Semiconductors in 2006 and continues to support legacy 80C51-based microcontrollers with long-term product assurance and documentation archives.

The P87C51RC2FA,512 belongs to the P87C51RA2/RB2/RC2/RD2 OTP microcontroller family, designed specifically for cost-sensitive, high-reliability industrial and motor control applications where firmware integrity and deterministic timing outweigh reprogrammability needs.

FAQ

What is the maximum operating frequency of the P87C51RC2FA,512?

The P87C51RC2FA,512 supports up to 33 MHz in 12-clock mode and 30 MHz in 6-clock mode at VCC = 5 V. At 3 V, the maximum frequency is reduced to 16 MHz. The 6-clock mode delivers twice the instruction throughput of standard 80C51 devices, enabling faster real-time response in time-critical applications like motor commutation.

Does the P87C51RC2FA,512 support in-system programming (ISP)?

No, the P87C51RC2FA,512 uses one-time programmable (OTP) memory and requires parallel programming via a commercial programmer before soldering. It does not support ISP or in-application reprogramming. Firmware must be finalized prior to programming, and the security bits prevent readback of the OTP contents after programming.

How many PWM channels does the P87C51RC2FA,512 provide?

The P87C51RC2FA,512 provides five independent PWM outputs via its Programmable Counter Array (PCA), using P1.3 (CEX0) through P1.7 (CEX4). Each channel supports configurable duty cycle, frequency, and edge-aligned or center-aligned modes - enabling simultaneous control of multiple actuators or LED banks without CPU overhead.

What package type and pin count does the P87C51RC2FA,512 use?

The P87C51RC2FA,512 is supplied in a 44-pin Plastic Leaded Chip Carrier (PLCC) package, SOT187-2 footprint, with operating temperature range –40°C to +85°C. This package is pin-compatible with other members of the P87C51RA2/RB2/RC2/RD2 family and maintains mechanical and thermal compatibility with legacy 80C51 PLCC layouts.

Can the P87C51RC2FA,512 operate from a 3.3 V supply?

Yes, the P87C51RC2FA,512 operates across 2.7 V to 5.5 V, including standard 3.3 V systems. At 3.3 V, the maximum clock frequency is 16 MHz in either 6- or 12-clock mode. All I/O pins are CMOS and TTL compatible, allowing direct interfacing with 3.3 V and 5 V peripherals without level shifters.