NXP Semiconductors P87LPC761BDH,112

Overview

P87LPC761BDH,112 from NXP Semiconductors (formerly Philips) is a 16-pin, low-power, OTP-based 80C51-compatible microcontroller optimized for cost-sensitive embedded control applications. It integrates 2 kbyte EPROM code memory, 128 byte RAM, two analog comparators, full-duplex UART, I²C interface, watchdog timer with on-chip oscillator, and programmable port configurations - enabling self-contained operation in battery-powered sensors and simple industrial controllers.

For engineers reviewing the P87LPC761BDH,112 datasheet, P87LPC761BDH,112 pinout, P87LPC761BDH,112 application, or P87LPC761BDH,112 equivalent, key selection criteria include its 2.7–6.0 V operating range, 20 MHz max clock (at 4.5–6.0 V), TSSOP16 package, dual comparator inputs/outputs, and support for idle/power-down modes with 1 µA typical current.

Technical Context

The P87LPC761BDH,112 implements an accelerated 80C51 CPU core executing instructions in 6 or 12 oscillator cycles - delivering 300–600 ns instruction cycle times at 20 MHz. Its internal architecture includes dedicated SFRs for comparator control (CMP1#/CMP2#), I²C management (I2CON#/I2CFG#), and power monitoring (PCON, WDCON#).

It supports multiple oscillator options - crystal/resonator (X1/X2), on-chip RC, or external clock - selectable via EPROM configuration bits. Port I/O is fully configurable per pin: quasi-bidirectional, open-drain, push-pull, or input-only, with Schmitt-trigger inputs and 20 mA LED drive capability on all pins.

Key Specifications

Pinout & Package

Package: Plastic thin shrink small outline package (TSSOP16), 16 leads, 4.4 mm body width (SOT403-1). Pin pitch: 0.65 mm. RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT89LP2052-20PU and STM8S003F3P6, the P87LPC761BDH,112 uniquely combines OTP security, dual comparators, I²C, and TSSOP16 packaging in a single-chip solution - making it optimal for fixed-function, space-constrained, analog-aware embedded nodes where reprogramming is not needed.

Availability

P87LPC761BDH,112 is available at Aetrix Electronics and suitable for smart sensor nodes, industrial control panels, power supply monitors, and legacy equipment interface adapters requiring stable component supply and long-term manufacturability.

Supply support for P87LPC761BDH,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 company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT markets.

The P87LPC761BDH,112 belongs to NXP's legacy LPC700 family - designed specifically for ultra-low-cost, low-pin-count embedded control where integration of analog monitoring, serial interfaces, and minimal external components is essential.

FAQ

What is the maximum operating frequency of the P87LPC761BDH,112 and under what conditions?

The P87LPC761BDH,112 supports up to 20 MHz operation when VDD is between 4.5 V and 6.0 V. At lower supply voltages (2.7–6.0 V), the maximum frequency is reduced to 10 MHz to ensure reliable timing margins. This voltage-dependent frequency scaling is hardwired in silicon and cannot be overridden by software configuration. The P87LPC761BDH,112 achieves this performance using an accelerated 80C51 core with 6-cycle machine cycles.

Does the P87LPC761BDH,112 support in-system programming (ISP) or require external EPROM programmers?

The P87LPC761BDH,112 uses one-time-programmable (OTP) EPROM memory and does not support in-system programming. Programming must be performed using a dedicated parallel EPROM programmer prior to soldering. Serial EPROM programming is supported during production via dedicated pins, but once programmed, the code cannot be erased or rewritten. The P87LPC761BDH,112 includes two EPROM security bits to prevent unauthorized readout of firmware.

How many analog comparators does the P87LPC761BDH,112 integrate, and what are their key electrical characteristics?

The P87LPC761BDH,112 integrates two independent analog comparators (CMP1 and CMP2), each with dedicated positive inputs (CIN1A/CIN1B and CIN2A/CIN2B) and a shared negative reference input (CMPREF). Input offset voltage is typically ±5 mV, propagation delay is <1.5 µs at 5 V, and common-mode input range extends from VSS to VDD – 1.0 V. The P87LPC761BDH,112 allows comparator outputs to generate interrupts or toggle port pins directly - bypassing CPU polling.

Can the P87LPC761BDH,112 operate without any external passive components?

Yes - the P87LPC761BDH,112 can operate with only VDD and VSS connections when configured for on-chip RC oscillator and internal power-on reset. Its integrated RC oscillator eliminates the need for external crystals or capacitors, and the on-chip power-on reset circuit removes the requirement for external reset ICs or RC networks. This makes the P87LPC761BDH,112 ideal for minimalist designs where board space and BOM count are critical constraints.

What I/O configuration options are available on the P87LPC761BDH,112 port pins, and how are they controlled?

The P87LPC761BDH,112 supports four I/O modes per pin: quasi-bidirectional, open-drain, push-pull, and input-only. These are selected via two dedicated Special Function Registers per port (e.g., P0M1# and P0M2# for Port 0). Configuration is static after reset or runtime reprogramming - no automatic mode switching. Each pin's mode is set independently, allowing mixed configurations on the same port. The P87LPC761BDH,112 also supports selectable Schmitt-trigger inputs for noise immunity on all configurable ports.