NXP Semiconductors P87LPC764BN,112

Overview

P87LPC764BN,112 from NXP Semiconductors (formerly Philips) is a 20-pin, OTP-based 80C51-compatible microcontroller optimized for low-cost, low-power embedded control in space-constrained applications. It integrates 4 kB EPROM code memory, 128 B RAM, two analog comparators, full-duplex UART, I²C interface, and a watchdog timer with on-chip oscillator - enabling self-contained operation with only VDD and VSS required. It targets industrial sensor nodes, simple appliance controllers, and LED-driven UI panels.

For engineers reviewing the P87LPC764BN,112 datasheet, P87LPC764BN,112 pinout, P87LPC764BN,112 application, or P87LPC764BN,112 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative options - all grounded in the official 2003 Philips product data sheet and ordering documentation.

Technical Context

The P87LPC764BN,112 implements an accelerated 80C51 CPU core executing instructions at twice the speed of standard 80C51 devices - achieving 300–600 ns instruction cycles at 20 MHz (VDD = 4.5–6.0 V) or 10 MHz (VDD = 2.7–6.0 V). Its architecture includes dual 16-bit timers, configurable port output modes (quasi-bidirectional, open-drain, push-pull), and selectable Schmitt-trigger inputs.

It embeds two independent analog comparators with programmable positive/negative input selection (CIN1A/CIN1B/CMPREF/Vref), interrupt-on-change capability, and compatibility with power-down wake-up. The on-chip RC oscillator (±25% tolerance) eliminates external crystal requirements, while the watchdog timer uses a separate internal oscillator to detect oscillator failure without external components.

Key Specifications

Pinout & Package

Package: 20-pin plastic dual in-line package (DIP20), 300 mil width, through-hole mount - compatible with legacy prototyping and wave-soldered industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P87LPC764BN,112, the P87LPC762BN,112 offers reduced code space and peripheral count at lower cost, while the P89LPC922FDH,518 provides Flash-based upgradability and smaller footprint - making the P87LPC764BN,112 optimal for fixed-function, crystal-free, through-hole applications demanding analog comparators and I²C in legacy-compatible form.

Availability

P87LPC764BN,112 is available at Aetrix Electronics and suitable for industrial sensor interfaces, appliance control panels, smart lighting nodes, and legacy equipment retrofits requiring stable component supply across extended production lifecycles.

Supply support for P87LPC764BN,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 (originally Philips Semiconductors) is a global leader in high-performance mixed-signal ICs, with expertise in secure connectivity, automotive, and industrial microcontrollers.

The P87LPC764BN,112 belongs to the LPC700 family - designed specifically for cost-sensitive, low-pin-count embedded control applications where integration of analog functions, serial interfaces, and ultra-low-power operation is critical.

FAQ

What is the maximum operating frequency of the P87LPC764BN,112 and under what voltage conditions?

The P87LPC764BN,112 operates at up to 20 MHz when supplied with 4.5 V to 6.0 V, and up to 10 MHz across its full 2.7 V to 6.0 V operating range. These limits are defined in the AC characteristics section of the official Philips product data sheet dated 2003 Sep 03. The P87LPC764BN,112 achieves this performance using an accelerated 80C51 core that executes most instructions in 6 or 12 clock cycles.

Does the P87LPC764BN,112 support in-system programming, and what memory type is used for firmware storage?

Yes, the P87LPC764BN,112 supports serial EPROM programming for in-circuit production coding, but it uses one-time-programmable (OTP) EPROM - not Flash - for its 4 kB code memory. This means firmware can be written once during manufacturing, with two security bits preventing readback of sensitive application code. The P87LPC764BN,112 does not support field reprogramming after initial programming.

How many analog comparators does the P87LPC764BN,112 include, and what reference voltages are available?

The P87LPC764BN,112 includes two independent analog comparators (CMP1 and CMP2), each configurable with selectable positive inputs (CIN1A/CIN1B or CIN2A/CIN2B) and negative inputs (CMPREF pin or internal 1.28 V ±10% Vref). Comparator outputs can drive dedicated pins (P0.6 and P0.0), generate interrupts, or be read synchronously via SFRs - all documented in the functional description section of the datasheet.

Can the P87LPC764BN,112 operate without an external crystal, and what is the oscillator accuracy?

Yes, the P87LPC764BN,112 includes a user-configurable on-chip RC oscillator that enables crystal-free operation. For the P87LPC764BN,112 variant, the RC oscillator has a tolerance of ±25% over temperature and supply voltage - sufficient for non-timing-critical applications like keypad scanning, LED control, or basic sensor polling. External crystals remain supported for higher-precision timing needs.

What power-saving modes does the P87LPC764BN,112 support, and how does wake-up work from Power Down mode?

The P87LPC764BN,112 supports Idle and Power Down modes, with typical Power Down current of 1 µA. Wake-up from Power Down is triggered by a low-level interrupt on any enabled external interrupt pin (e.g., INT0, INT1, or keypad inputs on Port 0), causing immediate CPU execution restart. The watchdog timer remains active during Power Down and can also initiate wake-up if configured for timeout interrupt - all confirmed in the "Power Reduction Modes" section of the datasheet.