87C754

Technical Summary: Philips 87C754 Microcontroller

Overview

The Philips 83C754/87C754 is an 8-bit microcontroller that combines the advantages of the 80C51 architecture with cost-effective packaging and low-power operation. Fabricated using Philips' high-density CMOS technology, this microcontroller is designed for embedded applications requiring compact size, efficient performance, and reliable operation. The epitaxial substrate used in its construction enhances noise immunity and minimizes power consumption, making it suitable for battery-powered and space-constrained designs.

Key Features

• 80C51 Core Architecture: Fully compatible with the industry-standard 80C51 instruction set, enabling easy migration from existing designs.
• Memory Options: Available in both erasable (quartz lid) and One-Time Programmable (OTP) plastic package variants.
• High-Density CMOS Technology: Provides low power consumption while maintaining high performance.
• Epitaxial Substrate: Enhances noise immunity and reduces latch-up susceptibility in noisy environments.
• Compact Package: Small form factor ideal for space-constrained applications.
• Low-Cost Solution: Optimized for cost-sensitive applications without sacrificing functionality.
• Wide Operating Voltage Range: Supports various power supply configurations.

Applications

The 87C754 microcontroller is versatile and finds use in numerous embedded control applications, including:

• Consumer electronics (remote controls, small appliances)
• Industrial control systems
• Automotive subsystems
• Medical devices
• Security systems
• Battery-powered devices
• Sensor interfaces
• Home automation systems

Electrical Characteristics

The 87C754 offers robust electrical performance with the following key specifications:

Absolute Maximum Ratings

• Supply Voltage (Vcc): -0.5V to +7.0V
• Input Voltage (any pin): -0.5V to Vcc+0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (Vcc): 4.5V to 5.5V (standard operation)
• Operating Frequency: Up to 12MHz
• Input High Voltage (VIH): 0.7Vcc to Vcc
• Input Low Voltage (VIL): -0.5V to 0.3Vcc

Power Consumption

• Active Mode (12MHz): 15mA typical
• Idle Mode (12MHz): 5mA typical
• Power Down Mode: <100μA

Timing Characteristics

• Machine Cycle: 1μs at 12MHz
• External Clock Frequency: 3.5MHz to 12MHz
• Reset Pulse Width: 24 clock cycles minimum

Package Information

The 87C754 is available in multiple package options to suit different application requirements:

Available Packages

• PLCC (Plastic Leaded Chip Carrier): 28-pin, square package with J-leads
• DIP (Dual In-line Package): 28-pin, through-hole package
• SOIC (Small Outline Integrated Circuit): 28-pin, surface-mount package

Package Dimensions

• PLCC-28: 11.43mm x 11.43mm body, 1.27mm lead pitch
• DIP-28: 36.32mm x 7.62mm body, 2.54mm lead pitch
• SOIC-28: 17.9mm x 7.5mm body, 1.27mm lead pitch

Package Marking

All packages include the following identification markings:

• Philips logo
• Part number (87C754)
• Speed grade
• Temperature range code
• Package code
• Date code
• Country of origin

Memory Organization

The 87C754 features a well-organized memory architecture:

Program Memory

• 4KB of on-chip ROM (OTP or UV-erasable versions)
• 64KB external program memory address space
• Program memory lock bits for security

Data Memory

• 128 bytes of on-chip RAM
• 64KB external data memory address space
• 128 bytes of special function register space

Peripheral Features

The microcontroller includes several integrated peripherals:

I/O Ports

• Four 8-bit I/O ports (P0, P1, P2, P3)
• Port 0: Open-drain bidirectional I/O
• Ports 1-3: Quasi-bidirectional I/O with internal pull-ups
• Multiple alternate functions per pin

Timers/Counters

• Two 16-bit timer/counters (Timer 0 and Timer 1)
• Four operating modes per timer
• External event counting capability

Serial Interface

• Full-duplex UART
• Fixed baud rate or variable through Timer 1
• Multiprocessor communication capability

Interrupt System

• Five interrupt sources
• Two priority levels
• External interrupts can be edge- or level-triggered

Development Support

The 87C754 is supported by a comprehensive development ecosystem:

Development Tools

• In-circuit emulators
• ROM simulators
• C compilers and assemblers
• Debuggers

Programming Support

• Parallel programmers for OTP versions
• UV erasers for windowed versions
• Third-party programming support

Quality and Reliability

The 87C754 meets stringent quality standards:

• Industrial temperature range operation
• ESD protection on all pins
• Latch-up resistant design
• Manufactured in ISO-9001 certified facilities