83C751/87C751 8-bit Microcontroller Technical Summary

Overview

The Philips 83C751 and 87C751 are high-performance 8-bit microcontrollers based on the industry-standard 80C51 architecture. These devices combine the core functionality of the 80C51 with specialized features including an I²C serial interface and low-power operation modes, making them particularly suitable for embedded control applications in consumer and industrial markets.

Available in both ROM (83C751) and EPROM (87C751) versions, these microcontrollers offer 2KB of program memory and 64 bytes of RAM. The devices are offered in multiple compact package options, providing design flexibility for space-constrained applications.

Key Features

Core Architecture

• 80C51 based 8-bit CPU architecture
• Boolean processor for efficient bit manipulation
• CMOS and TTL compatible I/O

Memory Configuration

• 2KB × 8 ROM (83C751 version)
• 2KB × 8 EPROM (87C751 OTP version)
• 64 × 8 bytes of RAM

Serial Communication

• Integrated Inter-Integrated Circuit (I²C) serial bus interface
• Supports standard I²C communication protocols

Timing Resources

• 16-bit auto-reloadable counter/timer
• Fixed-rate timer for precise timing operations

Power Management

• Low power consumption design:
  • Normal operation: <11mA @ 5V, 12MHz
  • Idle mode for reduced power
  • Power-down mode for minimal consumption
• Wide oscillator frequency range for flexibility

Packaging Options

• 24-pin DIP (300 mil "skinny DIP")
• 24-pin Shrink Small Outline Package (SSOP)
• 28-pin Plastic Leaded Chip Carrier (PLCC)

Applications

The 83C751/87C751 microcontrollers are designed for a wide range of embedded control applications, including:

• Consumer Electronics:
  • Remote controls
  • Small appliances
  • Audio/video equipment
• Industrial Control:
  • Sensor interfaces
  • Small-scale automation
  • Control panels
• Logic Replacement:
  • Discrete logic consolidation
  • Glue logic applications
• Peripheral Control:
  • Keyboard controllers
  • Display drivers

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7V
• Input Voltage (V_IN): -0.5V to V_CC+0.5V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

DC Characteristics (T_A = -40°C to +85°C, V_CC = 5V ±10%)

• Input Low Voltage (V_IL): -0.5V to 0.2V_CC-0.1V
• Input High Voltage (V_IH): 0.2V_CC+0.9V to V_CC+0.5V
• Output Low Voltage (I_OL = 1.6mA): 0.45V max
• Output High Voltage (I_OH = -60µA): V_CC-0.7V min

Power Consumption

• Active Mode (12MHz): 11mA typical
• Idle Mode (12MHz): 3.5mA typical
• Power-down Mode: 50µA typical

Timing Characteristics

• Oscillator Frequency Range: DC to 16MHz
• Machine Cycle: 12 oscillator periods
• I²C Bus Frequency: Up to 400kHz

Package Information

24-pin Dual In-line Package (DIP)

• Package Type: PDIP24
• Body Width: 300 mil (7.62mm)
• Lead Pitch: 100 mil (2.54mm)
• Dimensions: 31.75mm × 7.62mm × 4.57mm

24-pin Shrink Small Outline Package (SSOP)

• Package Type: SSOP24
• Body Width: 5.3mm
• Lead Pitch: 0.65mm
• Dimensions: 8.2mm × 5.3mm × 1.75mm

28-pin Plastic Leaded Chip Carrier (PLCC)

• Package Type: PLCC28
• Body Size: 11.43mm × 11.43mm
• Lead Pitch: 1.27mm
• Dimensions: 11.43mm × 11.43mm × 3.05mm

Development Support

The 83C751/87C751 microcontrollers are supported by a range of development tools including:

• In-circuit emulators
• C compilers and assemblers
• Evaluation boards
• Programming tools for the 87C751 OTP version

Conclusion

The Philips 83C751/87C751 microcontrollers provide a cost-effective, feature-rich solution for embedded control applications requiring the combination of 80C51 compatibility and I²C interface capability. With multiple memory options, low power consumption features, and compact packaging choices, these devices offer excellent flexibility for a wide range of applications while maintaining the benefits of the proven 80C51 architecture.

The availability of both ROM and OTP versions allows for both high-volume production and prototyping/low-volume applications, making the 83C751/87C751 family a versatile choice for designers across multiple market segments.