COP87L40CJ/COP87L42CJ Microcontroller Technical Summary

Overview

The COP87L40CJ and COP87L42CJ are high-performance 8-bit microcontrollers from National Semiconductor's COP8 family. These devices feature a memory-mapped architecture with integrated peripherals designed for embedded control applications. The microcontrollers combine low-power operation with robust processing capabilities, making them suitable for a wide range of industrial, consumer, and automotive applications.

Key to their design is the MICROWIRE/PLUS serial interface and advanced timer/counter functionality, which provide flexible communication and timing solutions. The devices are offered in multiple package options to accommodate different design requirements.

Features

• 8-bit Memory Mapped Architecture: Efficient memory organization for code and data
• MICROWIRE/PLUS Serial I/O: Enhanced serial communication interface supporting multiple modes
• 16-bit Timer/Counter: With capture/compare capabilities for precise timing operations
• Low Power Consumption: Multiple power-saving modes including HALT and IDLE
• On-chip Oscillator: Supports both crystal and RC oscillator configurations
• Wide Operating Voltage: 2.7V to 5.5V operation for battery-powered applications
• Integrated Watchdog Timer: For improved system reliability
• Multiple I/O Ports: Configurable digital I/O with programmable options
• Industrial Temperature Range: -40°C to +85°C operation

Applications

The COP87L40CJ/COP87L42CJ microcontrollers are designed for a broad spectrum of embedded control applications, including:

• Industrial control systems
• Automotive electronics
• Consumer appliances
• Security systems
• Sensor interfaces
• Power management systems
• Peripheral controllers
• Medical devices

Their combination of low power consumption and robust peripheral set makes them particularly suitable for battery-operated devices and systems requiring reliable operation in harsh environments.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (VCC): -0.3V to +6.0V
• Input Voltage (any pin): -0.3V to VCC +0.3V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage (VCC): 2.7V to 5.5V
• Operating Temperature: -40°C to +85°C
• Input High Voltage (VIH): 0.7VCC to VCC
• Input Low Voltage (VIL): 0V to 0.3VCC

DC Characteristics

• Supply Current (Active Mode @ 5V, 8MHz): 5mA typical
• Supply Current (HALT Mode @ 5V): 10μA typical
• Input Leakage Current (any pin): ±1μA maximum
• Output Drive Current (I/O pins): ±10mA

AC Characteristics

• Instruction Cycle Time (8MHz): 0.5μs
• MICROWIRE/PLUS Clock Frequency: 2MHz maximum
• Timer Clock Input Frequency: 8MHz maximum
• Reset Pulse Width: 10μs minimum

Package Information

Available Packages

• 28-pin PLCC (Plastic Leaded Chip Carrier): J-lead configuration with 1.27mm lead pitch
• 28-pin SOIC (Small Outline Integrated Circuit): Surface-mount package with 1.27mm lead pitch
• 28-pin PDIP (Plastic Dual In-line Package): Through-hole package with 2.54mm lead pitch

Package Dimensions

PLCC-28:

• Body Size: 11.43mm x 11.43mm
• Height: 3.05mm maximum
• Lead Pitch: 1.27mm

SOIC-28:

• Body Size: 17.9mm x 7.5mm
• Height: 2.65mm maximum
• Lead Pitch: 1.27mm

PDIP-28:

• Body Size: 36.32mm x 13.97mm
• Height: 4.44mm maximum
• Lead Pitch: 2.54mm

Thermal Characteristics

• Junction-to-Ambient Thermal Resistance (θJA):
  • PLCC: 45°C/W
  • SOIC: 75°C/W
  • PDIP: 50°C/W
• Maximum Junction Temperature: 150°C

Functional Description

Core Architecture

The COP87L40CJ/COP87L42CJ microcontrollers feature an enhanced 8-bit core with memory-mapped architecture. The CPU can address up to 64KB of memory space, with integrated program memory and data RAM. The instruction set includes arithmetic, logical, and bit manipulation operations optimized for control applications.

Memory Organization

• Program Memory: 4KB/8KB ROM (depending on variant)
• Data RAM: 256 bytes
• Memory Mapping: Unified address space for program and data memory
• Special Function Registers: Memory-mapped peripheral control registers

Peripheral Features

The devices include several integrated peripherals:

• 16-bit Timer/Counter: With capture/compare registers and multiple operating modes
• MICROWIRE/PLUS Interface: Synchronous serial interface supporting master and slave modes
• Multiple I/O Ports: Configurable as inputs, outputs, or special function pins
• On-chip Oscillator: Requires minimal external components
• Watchdog Timer: Programmable timeout period for system supervision

Development Support

National Semiconductor provides comprehensive development support for the COP87L40CJ/COP87L42CJ microcontrollers, including:

• Assembler and C compiler toolchains
• In-circuit emulators and debuggers
• Evaluation boards and development kits
• Application notes and reference designs