NXP Semiconductors P87LPC764BDH,518

Overview

P87LPC764BDH,518 from NXP Semiconductors (formerly Philips) is a 20-pin, low-power, OTP-based 80C51-compatible microcontroller with 4 kB on-chip EPROM, 128 B RAM, dual analog comparators, I²C and UART interfaces, and programmable port configurations. It operates from 2.7 V to 6.0 V, supports up to 20 MHz at 5 V, and targets cost-sensitive embedded control in industrial sensors and appliance subsystems.

For engineers reviewing the P87LPC764BDH,518 datasheet, P87LPC764BDH,518 pinout, P87LPC764BDH,518 application, or P87LPC764BDH,518 equivalent, key selection criteria include its TSSOP20 package, ±10% internal RC oscillator tolerance, watchdog timer with independent oscillator, LED drive capability (20 mA), and compatibility with legacy 80C51 toolchains while delivering double-speed instruction execution.

Technical Context

The P87LPC764BDH,518 implements an accelerated 80C51 CPU core executing instructions in 6 or 12 clock cycles (vs. 12/24 for standard 80C51), achieving 300–600 ns instruction cycle times at 20 MHz. Its on-chip oscillator supports crystal, resonator, or RC modes - with RC accuracy specified as ±10% for this variant - and includes fail-detect functionality via a dedicated watchdog oscillator.

Digital I/O is highly configurable per pin: quasi-bidirectional, open-drain, push-pull, or input-only modes are selectable via SFRs P0M1/P0M2/P1M1/P1M2; Schmitt-trigger inputs and controlled slew-rate outputs (≥10 ns ramp time) reduce EMI. Two 16-bit timers, full-duplex UART, and I²C interface operate independently of CPU clock division settings controlled by DIVM and CLKR bits.

Key Specifications

Pinout & Package

TSSOP20 package (SOT360-1), 4.4 mm body width, 0.65 mm pitch, lead-free compatible, suitable for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P87LPC764BDH,518, the P89LPC922FDH offers greater memory and debug features but sacrifices RC oscillator flexibility, while the AT89LP2052-20PU reduces cost and complexity at the expense of integrated analog and serial peripherals - making P87LPC764BDH,518 optimal for balanced feature-rich, low-BOM embedded control.

Availability

P87LPC764BDH,518 is available at Aetrix Electronics and suitable for industrial sensor nodes, home appliance subsystems, smart lighting dimmers, and POS peripheral modules requiring stable component supply across extended product lifecycles.

Supply support for P87LPC764BDH,518 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, formerly Philips Semiconductors, is a global leader in high-performance mixed-signal ICs for automotive, industrial, and consumer applications, with expertise in 8-bit microcontrollers and embedded system solutions.

The P87LPC764BDH,518 belongs to NXP's LPC700 family of low-pin-count, low-power 80C51 derivatives designed specifically for cost-sensitive, space-constrained embedded control applications requiring integrated analog functions and robust communication interfaces.

FAQ

What is the maximum operating frequency of the P87LPC764BDH,518 and under what voltage conditions?

The P87LPC764BDH,518 supports a maximum operating frequency of 20 MHz when VDD is between 4.5 V and 6.0 V. At lower supply voltages from 2.7 V to 6.0 V, the maximum frequency is reduced to 10 MHz. This dual-frequency specification allows designers to optimize performance versus power consumption based on system voltage regulation capability - for example, enabling full-speed operation during mains-powered mode and throttling to 10 MHz during battery backup.

Does the P87LPC764BDH,518 include an internal RC oscillator, and what is its accuracy?

Yes, the P87LPC764BDH,518 includes a user-configurable on-chip RC oscillator with ±10% accuracy over temperature and voltage, as confirmed in the Device Comparison Table for P87LPC764BDH and P87LPC764HDH variants. This oscillator eliminates the need for external crystal or resonator components in cost-sensitive applications where precise timing is not required - such as basic LED control or non-critical sensor polling - while still supporting UART baud rate generation within acceptable error margins.

How many I/O pins does the P87LPC764BDH,518 provide, and what configuration options are available?

The P87LPC764BDH,518 provides a minimum of 15 general-purpose I/O pins, expandable to 18 when using on-chip oscillator and reset options to free up external component pins. Each pin supports multiple output configurations - quasi-bidirectional, open-drain, push-pull, or input-only - selected independently via SFRs P0M1/P0M2/P1M1/P1M2. This flexibility enables direct interfacing with TTL, CMOS, and I²C buses without level-shifting components, and supports LED driving (20 mA), keypad scanning, and analog input isolation via PT0AD register.

What analog peripherals are integrated into the P87LPC764BDH,518, and how are they implemented?

The P87LPC764BDH,518 integrates two independent analog comparators (CMP1 and CMP2) with programmable inputs (CIN1A/CIN1B/CIN2A/CIN2B), selectable negative references (CMPREF pin or internal 1.28 V ±10% Vref), and interrupt-on-change capability. Comparator outputs can be routed to dedicated pins (P0.6 and P0.0) or read synchronously via SFR bits CMF1/CMF2. To ensure accurate analog operation, digital inputs on comparator pins must be disabled using the PT0AD register, and port outputs configured as input-only to prevent contention - a requirement explicitly documented in the Functional Description section.

Is the P87LPC764BDH,518 pin-compatible with other members of the LPC700 family, and what package does it use?

Yes, the P87LPC764BDH,518 uses the TSSOP20 package (SOT360-1) and shares identical pinout and electrical characteristics with other 20-pin LPC700 variants including P87LPC764BD, P87LPC764BN, and P87LPC764FDH - differing only in temperature grade, oscillator tolerance, and packaging. All share the same SU01149 pin configuration diagram, confirming mechanical and functional pin compatibility across the family. This allows design reuse across commercial, industrial, and extended-temperature applications without PCB layout changes.