Technical Summary: Philips 87C550 Microcontroller

Overview

The Philips 87C550 is a high-performance microcontroller based on the 80C51 architecture, fabricated using Philips' advanced high-density CMOS technology. This technology combines the speed and density benefits of HMOS with the low power consumption of CMOS, making it suitable for a wide range of embedded applications. The microcontroller features an epitaxial substrate that minimizes latch-up sensitivity, enhancing its reliability in demanding environments.

The 87C550 variant includes 4KB of on-board EPROM, providing flexible program storage for developers. It is designed for applications requiring robust performance, low power consumption, and integrated analog-to-digital conversion capabilities.

Features

Core Architecture

• 80C51-based architecture with enhanced functionality.
• 4KB × 8 EPROM (87C550) or ROM (83C550) for program storage.
• 128 × 8 RAM for data storage and processing.
• Boolean processor for efficient bit manipulation.

Peripheral Integration

• Eight channels of 8-bit A/D conversion for analog signal processing.
• Two 16-bit counter/timers for precise timing and event counting.
• Watchdog timer for system reliability and recovery.
• Full-duplex serial channel (UART) for communication.

Memory and Addressing

• 64KB ROM and 64KB RAM external memory addressing capability.

Power Management

• Idle mode for reduced power consumption during inactivity.
• Power-down mode for minimal power usage when the system is idle.

Compatibility and Performance

• CMOS and TTL compatible for easy interfacing with other logic families.
• Single speed range (3.5MHz to 16MHz) at V_CC = 5V ±10%.
• Extended temperature ranges for industrial applications.
• One-Time Programmable (OTP) package option available for prototyping and production.

Applications

The 87C550 microcontroller is well-suited for a variety of embedded applications, including but not limited to:

• Industrial control systems – Leveraging its A/D converters and robust design.
• Consumer electronics – Such as smart appliances and remote controls.
• Automotive systems – Where reliability and extended temperature operation are critical.
• Sensor interfaces – Utilizing its analog-to-digital conversion capabilities.
• Communication devices – Benefiting from its full-duplex serial channel.

Electrical Characteristics

Operating Conditions

• Supply voltage (V_CC): 5V ±10%.
• Operating frequency: 3.5MHz to 16MHz.
• Temperature ranges:
  • Standard: 0°C to +70°C.
  • Extended: -40°C to +85°C (selected packages).

Power Consumption

• Active mode: Current consumption varies with clock frequency.
• Idle mode: Reduced power consumption with CPU halted but peripherals active.
• Power-down mode: Minimal current draw (typically µA range) with only RAM retention.

Analog-to-Digital Converter (ADC) Specifications

• Resolution: 8-bit.
• Channels: 8 multiplexed inputs.
• Conversion time: Dependent on clock frequency.

Package Information

Available Packages

• Plastic Dual In-Line Package (PDIP) – SOT129-1.
• Plastic Leaded Chip Carrier (PLCC) – SOT187-2.

Ordering Information

The 87C550 is available in multiple configurations, including ROMless (80C550), ROM (83C550), and EPROM (87C550) variants. Below is a summary of ordering options:

• P80C550EBP – ROMless, PDIP, 0°C to +70°C, 3.5-16MHz.
• P83C550EBP – ROM, PDIP, 0°C to +70°C, 3.5-16MHz.
• P87C550EBP – EPROM, PDIP, 0°C to +70°C, 3.5-16MHz.
• P80C550EBA – ROMless, PLCC, 0°C to +70°C, 3.5-16MHz.
• P83C550EBA – ROM, PLCC, 0°C to +70°C, 3.5-16MHz.
• P87C550EBA – EPROM, PLCC, 0°C to +70°C, 3.5-16MHz.
• P80C550EFA – ROMless, PLCC, -40°C to +85°C, 3.5-16MHz.
• P83C550EFA – ROM, PLCC, -40°C to +85°C, 3.5-16MHz.
• P87C550EFA – EPROM, PLCC, -40°C to +85°C, 3.5-16MHz.

OTP (One-Time Programmable) Option

The 87C550 is also available in an OTP (One-Time Programmable) version, which allows for cost-effective prototyping and low-volume production without the need for UV-erasable EPROMs.

Conclusion

The Philips 87C550 microcontroller is a versatile and high-performance solution for embedded systems requiring integrated analog-to-digital conversion, robust timing capabilities, and low power consumption. Its compatibility with the 80C51 architecture ensures a familiar development environment, while its advanced CMOS technology provides the speed and efficiency needed for modern applications. With multiple package options and temperature ranges, the 87C550 is suitable for a broad spectrum of industrial, automotive, and consumer applications.