87C750 Microcontroller Technical Summary

Overview

The Philips 87C750 is an 8-bit microcontroller based on the widely-used 80C51 architecture. It is designed for applications requiring compact size, low power consumption, and efficient processing capabilities. The 87C750 is available in one-time programmable (OTP) plastic packages, making it a cost-effective solution for embedded systems. With its robust feature set and flexible packaging options, this microcontroller is well-suited for a variety of consumer, industrial, and logic replacement applications.

Key Features

• 80C51 Core Architecture: Inherits the proven 80C51 instruction set and processing capabilities.
• High-Speed Operation: Supports oscillator frequencies up to 16MHz for demanding applications.
• Compact Package Options: Available in multiple small footprint packages:
  • 24-pin DIP (300 mil "skinny DIP")
  • 24-pin Shrink Small Outline Package (SSOP)
  • 28-pin Plastic Leaded Chip Carrier (PLCC)
• Memory Configuration:
  • 1KB × 8 EPROM (87C750 variant)
  • 64 × 8 bytes of RAM
• Power Management: Features multiple low-power modes:
  • Normal operation: <11mA @ 5V, 12MHz
  • Idle mode for reduced power consumption
  • Power-down mode for minimal power usage
• Timer/Counter: 16-bit auto-reloadable timer/counter for precise timing operations.
• Boolean Processor: Enhanced bit manipulation capabilities for efficient control applications.
• Compatibility: CMOS and TTL compatible I/O for flexible system integration.

Applications

The 87C750 microcontroller is designed for a wide range of applications, including:

• Consumer Electronics: Remote controls, small appliances, and entertainment systems.
• Industrial Control: Sensor interfaces, small-scale automation, and monitoring systems.
• Logic Replacement: Replaces discrete logic components in cost-sensitive designs.
• Embedded Systems: Ideal for applications requiring compact size and low power consumption.
• Automotive: Non-critical automotive subsystems and accessories.

Electrical Characteristics

Absolute Maximum Ratings

• Supply Voltage (V_CC): -0.5V to +7.0V
• 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

• Supply Voltage (V_CC): 4.5V to 5.5V
• 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 (V_OL): 0.45V max @ 1.6mA
• Output High Voltage (V_OH): 2.4V min @ -60µA
• Power Consumption:
  • Active Mode: <11mA @ 5V, 12MHz
  • Idle Mode: <3.5mA @ 5V, 12MHz
  • Power-down Mode: <50µA @ 5V

AC Characteristics

• Oscillator Frequency Range: 0Hz to 16MHz
• Machine Cycle: 12 oscillator periods (1µs @ 12MHz)
• External Data Memory Write Pulse Width: 200ns min @ 12MHz
• External Data Memory Read Pulse Width: 200ns min @ 12MHz
• Address Valid to ALE Low: 50ns min @ 12MHz

Package Information

24-Pin DIP (Dual In-line Package)

• Package Type: PDIP
• Pitch: 300 mil (7.62mm)
• Dimensions: 31.75mm × 7.62mm × 4.57mm
• Lead Count: 24
• Material: Plastic

24-Pin Shrink Small Outline Package (SSOP)

• Package Type: SSOP
• Pitch: 0.65mm
• Dimensions: 8.65mm × 5.3mm × 1.75mm
• Lead Count: 24
• Material: Plastic

28-Pin PLCC (Plastic Leaded Chip Carrier)

• Package Type: PLCC
• Pitch: 1.27mm
• Dimensions: 11.43mm × 11.43mm × 3.05mm
• Lead Count: 28
• Material: Plastic

Functional Description

The 87C750 microcontroller combines the powerful 80C51 architecture with optimized features for space-constrained applications. The 1KB EPROM provides sufficient program memory for many control applications, while the 64 bytes of RAM handle data storage needs. The 16-bit timer/counter offers flexible timing capabilities, and the Boolean processor enables efficient bit manipulation operations.

The microcontroller supports three power modes to optimize energy consumption. In active mode, all functions are operational. Idle mode stops the CPU while maintaining peripheral operation, and power-down mode preserves RAM contents while minimizing power draw. These features make the 87C750 particularly suitable for battery-powered applications.

Development Support

The 87C750 is supported by standard 80C51 development tools, including:

• Assemblers and C compilers targeting the 80C51 architecture
• In-circuit emulators for real-time debugging
• EPROM programmers for device programming
• Evaluation boards for rapid prototyping

Ordering Information

The 87C750 is available in several package variants:

• 87C750FN: 24-pin DIP package
• 87C750FB: 24-pin SSOP package
• 87C750FA: 28-pin PLCC package