NXP Semiconductors P87C51RC2BBD,157

Overview

P87C51RC2BBD,157 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, capture, and 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, targeting motor control and embedded industrial systems.

For engineers reviewing the P87C51RC2BBD,157 datasheet, P87C51RC2BBD,157 pinout, P87C51RC2BBD,157 application, or P87C51RC2BBD,157 equivalent, key selection criteria include OTP capacity (32 KB), PCA-based PWM capability, LQFP-44 package compatibility, dual clock mode configurability (via CKCON.X2 or OTP bit OX2), and support for low-voltage operation down to 2.7 V with power-down and idle modes.

Technical Context

The P87C51RC2BBD,157 implements an accelerated 80C51 CPU core with full instruction set compatibility and static CMOS design enabling 0–33 MHz operation. Its clock system allows software-selectable 6-clock or factory-programmable 6-clock/12-clock mode, directly affecting instruction throughput and serial baud rate generation.

It integrates a 5-channel Programmable Counter Array (PCA) with dedicated CEX0–CEX4 pins for PWM output and edge-triggered capture, plus Timer 2 configured as a baud-rate generator or clock-out source. The enhanced UART supports automatic address recognition and framing error detection, while interrupt handling includes seven sources across four priority levels with nested vectoring.

Key Specifications

Pinout & Package

LQFP-44 package (SOT389-1), 10 mm × 10 mm body, 0.8 mm pitch, exposed pad optional; RoHS-compliant, industrial temperature range (0 °C to +70 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51RC2-24PU and P89C51RD2BBD,157, the P87C51RC2BBD,157 offers deterministic OTP execution timing and integrated PCA hardware ideal for hard real-time motor control, whereas alternatives trade off programmability or peripheral richness for memory scalability.

Availability

P87C51RC2BBD,157 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC I/O modules, embedded HMI controllers, and power supply monitoring units requiring stable component supply, long-term lifecycle assurance, and industrial temperature grade performance.

Supply support for P87C51RC2BBD,157 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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The P87C51RC2BBD,157 belongs to the legacy P87C51x2 OTP microcontroller family designed for cost-sensitive, high-reliability embedded control applications where firmware immutability and deterministic timing are critical - especially in motor drives and industrial automation.

FAQ

What is the maximum operating frequency of the P87C51RC2BBD,157?

The P87C51RC2BBD,157 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 actual achievable speed depends on the selected clock mode (configured via CKCON.X2 or OTP bit OX2) and supply voltage stability. The P87C51RC2BBD,157 must be operated within these limits to ensure correct instruction execution and peripheral timing compliance.

Does the P87C51RC2BBD,157 support in-system programming?

No, the P87C51RC2BBD,157 uses one-time programmable (OTP) memory and does not support in-system or in-circuit reprogramming. Firmware must be programmed using a parallel programmer before soldering. The P87C51RC2BBD,157 is intended for production applications where code is finalized and verified prior to manufacturing, ensuring immunity to accidental overwrite or corruption during field operation.

How many PWM channels does the P87C51RC2BBD,157 provide?

The P87C51RC2BBD,157 provides five independent PWM-capable channels via its Programmable Counter Array (PCA), accessible on P1.3 (CEX0) through P1.7 (CEX4). Each channel can be individually configured for edge-aligned or center-aligned PWM output with programmable period and duty cycle. This capability is implemented in hardware and does not consume CPU cycles during waveform generation - a key feature of the P87C51RC2BBD,157 for real-time motor control.

What package type is used for the P87C51RC2BBD,157?

The P87C51RC2BBD,157 uses a plastic quad flat pack (LQFP) with 44 leads (SOT389-1), measuring 10 mm × 10 mm with 0.8 mm lead pitch. This surface-mount package supports automated assembly and provides adequate thermal and electrical performance for industrial ambient conditions. The P87C51RC2BBD,157's pinout matches other members of the P87C51x2 family in LQFP-44, enabling layout reuse across memory variants.

Can the P87C51RC2BBD,157 operate from a 3.3 V supply?

Yes, the P87C51RC2BBD,157 is fully specified for operation from 2.7 V to 5.5 V, making it compatible with standard 3.3 V logic systems. At 3.3 V, the maximum operating frequency is 16 MHz (both clock modes), and all I/O pins maintain TTL/CMOS compatibility. The P87C51RC2BBD,157's wide voltage range simplifies power design in mixed-voltage embedded systems without requiring level shifters for interfacing with 3.3 V peripherals.