NXP Semiconductors P87C660X2FA,529

Overview

P87C660X2FA,529 from NXP Semiconductors (formerly Philips) is an 8-bit OTP microcontroller based on the 80C51 architecture, featuring 16 KB on-chip OTP memory, 512 B RAM, dual I²C interfaces (one Fast-mode up to 400 kbit/s), 32 I/O pins, and support for 6-/12-clock operation at up to 33 MHz (12-clock mode, V_CC = 5 V). It operates across 2.7–5.5 V and targets low-power industrial control applications requiring precise timing, PWM, and multi-master I²C communication.

For engineers reviewing the P87C660X2FA,529 datasheet, P87C660X2FA,529 pinout, P87C660X2FA,529 application, or P87C660X2FA,529 equivalent, this page delivers verified technical context, package-validated pin functions, real-world use cases, and two confirmed alternative parts with documented functional and application-level distinctions - all derived from the official 2003 Philips product data sheet.

Technical Context

The P87C660X2FA,529 implements a static CMOS 80C51 core with full instruction set compatibility and adds enhanced peripherals including a Programmable Counter Array (PCA) supporting PWM, capture/compare, and four independent channels; three 16-bit timers (T0, T1, T2); and a full-duplex enhanced UART with framing error detection and automatic address recognition.

It supports two I²C interfaces: one configurable for Fast-mode (400 kbit/s) or Standard-mode (100 kbit/s), and - unlike the P87C661X2 - only one I²C port (SCL0/SDA0 on P1.6/P1.7); the second I²C interface (SCL1/SDA1) is absent in the P87C660X2 variant per selection table and pin descriptions. Clock mode is selectable via SFR bit X2 (CKCON.0) or OTP bit OX2, enabling 6-clock (30 MHz max) or 12-clock (33 MHz max) operation at 5 V.

Key Specifications

Pinout & Package

Package: PLCC44 (plastic leaded chip carrier, 44 leads, SOT187–2), rated for –40 °C to +85 °C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with P87C661X2FA, the P87C660X2FA omits the second I²C interface - reducing pin count complexity and cost - while retaining identical OTP size, RAM, timers, and power modes. Against AT89C51RD2-RL, it trades Flash reprogrammability for guaranteed hardware I²C performance and lower system-level timing jitter in sensor-actuator coordination.

Availability

P87C660X2FA,529 is available at Aetrix Electronics and suitable for industrial automation, motor control, and legacy embedded system upgrades requiring stable component supply, long-lifecycle support, and verified PLCC44 packaging.

Supply support for P87C660X2FA,529 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 deep expertise in automotive, industrial, and secure connectivity solutions.

The P87C660X2FA,529 belongs to the P8xC66xX2 family - designed specifically for cost-sensitive, low-power 8051-based control applications demanding robust I²C communication, precise PWM, and extended temperature operation without sacrificing code compatibility.

FAQ

What is the maximum operating frequency of the P87C660X2FA,529?

The P87C660X2FA,529 supports up to 33 MHz at V_CC = 5 V in 12-clock mode, and 30 MHz in 6-clock mode. At 2.7 V, the maximum frequency is 16 MHz. These limits are defined by the internal oscillator circuit and static CMOS design, and must be observed to ensure reliable instruction execution and peripheral timing - especially for I²C baud rate generation and PCA PWM resolution. The P87C660X2FA,529 datasheet specifies these values in the Selection Table on page 3.

Does the P87C660X2FA,529 include a second I²C interface?

No, the P87C660X2FA,529 includes only one I²C interface (SCL0/SDA0 on P1.6/P1.7), configurable for Fast-mode (400 kbit/s) or Standard-mode (100 kbit/s). The second I²C interface (SCL1/SDA1) is exclusive to the P87C661X2 variant, as confirmed in the Selection Table (page 3), Block Diagram (page 4), and Pin Descriptions (page 7). Using P87C660X2FA,529 in a dual-I²C design requires external bus multiplexing or a different MCU.

How is the clock mode selected on the P87C660X2FA,529?

Clock mode (6-clock vs. 12-clock) on the P87C660X2FA,529 is controlled by both an OTP bit (OX2) programmed during parallel programming and an SFR bit (X2 in CKCON.0). If OX2 is programmed (6-clock), it overrides the X2 bit setting. If OX2 is erased, the X2 bit determines mode: X2 = 1 selects 6-clock, X2 = 0 selects 12-clock. This dual-control mechanism ensures flexibility in production and field configuration while maintaining deterministic behavior - critical for timing-critical applications using the P87C660X2FA,529.

What package and temperature grade is the P87C660X2FA,529 supplied in?

The P87C660X2FA,529 is supplied in a PLCC44 package (SOT187–2) rated for operation from –40 °C to +85 °C. This is explicitly stated in the Ordering Information table (page 4) and distinguishes it from the LQFP44 variant (P87C660X2BBD). The PLCC44 package provides robust thermal and mechanical performance for industrial PCBs, and its through-hole-compatible footprint supports high-reliability mounting in vibration-prone environments - a key consideration for P87C660X2FA,529 deployments.

Can the P87C660X2FA,529 generate PWM signals?

Yes, the P87C660X2FA,529 generates hardware PWM using its Programmable Counter Array (PCA), which includes five independent modules (CEX0–CEX4) capable of PWM output, capture, and compare functions. Each module can be configured for edge-aligned or center-aligned PWM with programmable period and duty cycle via RCAP registers. This eliminates software-timed bit-banging, ensuring jitter-free output essential for motor control and LED dimming - a core capability confirmed in the Features section (page 2) and Special Function Register definitions (page 9) of the P87C660X2FA,529 datasheet.