NXP Semiconductors P89LV51RD2BN,112

Overview

P89LV51RD2BN,112 from NXP Semiconductors is an 8-bit 80C51 microcontroller with 64 kB on-chip flash program memory, 1 kB data RAM, 3 V operation (0–33 MHz), X2 mode (6-clock per machine cycle), and in-system programmability (ISP/IAP). It integrates SPI, enhanced UART, PCA with PWM/capture/compare, three 16-bit timers, and brownout detection - deployed in industrial control panels requiring field firmware updates and low-EMI timing.

For engineers reviewing the P89LV51RD2BN,112 datasheet, P89LV51RD2BN,112 pinout, P89LV51RD2BN,112 application, or P89LV51RD2BN,112 equivalent, key selection criteria include flash size (64 kB), dual clock mode (12/6-clock), TQFP44 package compatibility, ISP/IAP capability, and 3 V/−40 °C to +85 °C industrial temperature grade.

Technical Context

The P89LV51RD2BN,112 implements a standard 80C51 CPU core with extended functionality including a programmable counter array (PCA) supporting five capture/compare modules and PWM generation, plus dual DPTR registers for efficient external memory access. Its memory architecture separates 64 kB flash (Block 0) and ISP/IAP routines (Block 1), with bank selection controlled via SWR/BSEL bits in FCF register.

It supports two operational clock modes: default 12-clock (1 machine cycle = 12 oscillator cycles) and X2 mode (1 machine cycle = 6 oscillator cycles), enabling either doubled throughput at same frequency or halved clock frequency for EMI reduction. Low-power modes include Power-down (external interrupt wake-up) and Idle, with brownout detection threshold fixed at 2.35 V.

Key Specifications

Pinout & Package

Package: TQFP44 (plastic thin quad flat package; 44 leads; body 10 × 10 × 1.0 mm; SOT376-1).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8051-based microcontroller applications.

Compared with AT89C51ED2-IM and STC89C52RC, the P89LV51RD2BN,112 delivers unique value through integrated X2 mode for deterministic timing, full IAP capability for secure field updates, and industrial-grade brownout protection - making it irreplaceable in safety-critical embedded systems requiring long-term firmware maintainability.

Availability

P89LV51RD2BN,112 is available at Aetrix Electronics and suitable for industrial motor control, smart energy metering, building automation panels, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for P89LV51RD2BN,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 focused on secure connectivity solutions for automotive, industrial, and IoT applications, with deep expertise in microcontrollers and mixed-signal integration.

The P89LV51RD2BN,112 belongs to NXP's legacy 80C51 family designed for cost-sensitive, high-reliability industrial control applications where field-upgradable firmware, EMI robustness, and extended temperature operation are essential.

FAQ

What is the maximum operating frequency of the P89LV51RD2BN,112 in X2 mode?

The P89LV51RD2BN,112 supports up to 33 MHz oscillator frequency in X2 mode, delivering effective 66 MHz instruction throughput (6-clock per machine cycle). This allows deterministic real-time response in applications like motor control where loop timing must be guaranteed within 100 µs intervals. The P89LV51RD2BN,112 maintains full functionality - including ISP, IAP, and peripheral operation - at this maximum rated speed.

Does the P89LV51RD2BN,112 support in-application programming (IAP) while running user code?

Yes, the P89LV51RD2BN,112 fully supports IAP: its flash memory can be reconfigured during active program execution using dedicated IAP routines stored in Block 1. This enables dynamic parameter storage, firmware patching, and secure boot updates without halting the main application. The P89LV51RD2BN,112 requires proper banking control (SWR/BSEL bits) and sector erase/write sequencing per NXP's IAP documentation.

Which package type does the P89LV51RD2BN,112 use, and what are its key mechanical dimensions?

The P89LV51RD2BN,112 uses the TQFP44 package (SOT376-1): plastic thin quad flat package with 44 leads, body size 10.0 mm × 10.0 mm × 1.0 mm, and 0.8 mm lead pitch. This RoHS-compliant package supports automated SMT assembly and provides thermal performance suitable for industrial ambient temperatures up to +85 °C. The P89LV51RD2BN,112 pinout matches standard 8051 layouts for design reuse.

How does the brownout detection feature protect the P89LV51RD2BN,112 during voltage drops?

The P89LV51RD2BN,112 incorporates a hardware brownout detector with a fixed 2.35 V threshold. When VDD falls below this level, it triggers either a reset (default) or a brownout interrupt (if EBO bit is enabled), preventing corrupted flash writes and erratic CPU behavior. The P89LV51RD2BN,112 retains RAM contents during brownout reset, ensuring state recovery upon voltage restoration - critical for energy metering and control log integrity.

Can the P89LV51RD2BN,112 operate from a 3.3 V supply across its full temperature range?

Yes, the P89LV51RD2BN,112 is specified for 3 V ±10 % operation (2.7 V to 3.6 V) across the full industrial temperature range of −40 °C to +85 °C. Its internal voltage regulator and I/O buffers maintain TTL/CMOS compatibility throughout this range, enabling direct interfacing with 3.3 V peripherals without level shifters. The P89LV51RD2BN,112 datasheet confirms stable operation at 33 MHz even at 2.7 V and −40 °C.