NXP Semiconductors P87C51RB2BBD,157

Overview

P87C51RB2BBD,157 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 16 KB on-chip OTP program memory, 512 B RAM, 32 I/O pins, three 16-bit timers (T0/T1/T2), a full-duplex enhanced UART, and a 5-channel 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.

For engineers reviewing the P87C51RB2BBD,157 datasheet, P87C51RB2BBD,157 pinout, P87C51RB2BBD,157 application, or P87C51RB2BBD,157 equivalent, key selection criteria include its LQFP-44 package with 32 configurable I/Os, 6-/12-clock mode flexibility, low-voltage operation down to 2.7 V, integrated PCA for precise timing control, and compatibility with legacy 80C51 toolchains and code bases.

Technical Context

The P87C51RB2BBD,157 implements a static CMOS 80C51 core with 100% instruction set compatibility and adds extended peripherals including Timer 2 (capture/compare), four-priority-level nested interrupts, and dual data pointers. Its clock system supports software-selectable 6-clock or factory-programmable 6-clock mode via CKCON.X2 and OTP bit OX2 - enabling up to 33 MHz operation at 5 V while maintaining backward timing predictability.

It integrates a full-duplex enhanced UART with framing error detection and automatic address recognition, plus a 5-channel PCA with independent PWM, input capture, and software-triggered compare outputs. All I/O ports (P0–P3) feature internal pull-ups and configurable alternate functions, with Port 1 dedicated to PCA channels (CEX0–CEX4) and Timer 2 control (T2/T2EX/ECI).

Key Specifications

Pinout & Package

Package: LQFP-44 (SOT389-1), 10 mm × 10 mm, 0.8 mm pitch, lead-free compatible.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89C51RC2-24PU and P89V51RD2FA, the P87C51RB2BBD,157 delivers deterministic 6-/12-clock timing, hardware-accelerated PWM via PCA, and OTP security - making it optimal for cost-sensitive, high-volume motor control where firmware immutability and precise timing are critical.

Availability

P87C51RB2BBD,157 is available at Aetrix Electronics and suitable for motor control systems, industrial PLC modules, embedded instrumentation, and legacy 80C51 upgrades requiring stable component supply and long-term manufacturing continuity.

Supply support for P87C51RB2BBD,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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep heritage in 8-bit microcontrollers inherited from Philips Semiconductors.

The P87C51RB2BBD,157 belongs to the P87C51RA2/RB2/RC2/RD2 OTP microcontroller family, designed specifically for cost-effective, high-reliability embedded control in industrial and consumer equipment where firmware integrity and long-term availability are essential.

FAQ

What is the maximum operating frequency of the P87C51RB2BBD,157 and under what conditions?

The P87C51RB2BBD,157 supports up to 33 MHz at 5 V in 12-clock mode and 30 MHz at 3 V. In 6-clock mode (enabled via OTP bit OX2 or CKCON.X2), it achieves equivalent throughput at half the oscillator frequency - e.g., 16.5 MHz crystal yields 33 MHz effective CPU speed. Operation above 30 MHz requires VCC ≥ 4.5 V per datasheet specifications.

Does the P87C51RB2BBD,157 support in-system programming (ISP)?

No, the P87C51RB2BBD,157 uses one-time programmable (OTP) memory and does not support in-system programming. Programming requires parallel programming hardware with VPP = 12.5 V during write cycles. Firmware must be verified pre-deployment, as reprogramming is not possible after initial programming.

How many PWM outputs can the P87C51RB2BBD,157 generate simultaneously?

The P87C51RB2BBD,157 can generate up to five independent PWM signals simultaneously using its 5-channel Programmable Counter Array (PCA), with each channel (CEX0–CEX4) configurable for edge-aligned or center-aligned PWM output. Resolution is determined by Timer 2 reload value and oscillator frequency.

What package type and pin count does the P87C51RB2BBD,157 use?

The P87C51RB2BBD,157 uses a 44-pin LQFP package (SOT389-1), measuring 10 mm × 10 mm with 0.8 mm pitch. It provides 32 general-purpose I/O pins across Ports 0–3, plus dedicated oscillator, reset, and power terminals - matching pin-for-pin functionality with PLCC-44 and PDIP-40 variants in the same family.

Can the P87C51RB2BBD,157 operate from a 3.3 V supply?

Yes, the P87C51RB2BBD,157 is fully specified for operation from 2.7 V to 5.5 V. At 3.3 V, it supports frequencies up to 16 MHz in 12-clock mode and up to 30 MHz in 6-clock mode (with appropriate derating). All I/Os remain TTL/CMOS compatible, and internal regulators ensure stable core voltage across the range.