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89C21 Specifications

Detailed technical information and Application Scenarios

Product Details

PartNumberManufactorQuantityAvailability
89C21NS100Yes

89C21** is a microcontroller manufactured by **NS (National Semiconductor)**.

The 89C21 is a microcontroller manufactured by NS (National Semiconductor). Below are the factual specifications, descriptions, and features:

Specifications:

  • Manufacturer: National Semiconductor (NS)
  • Core: 8-bit microcontroller
  • Architecture: Based on MCS-51 (Intel 8051 compatible)
  • Clock Speed: Up to 12 MHz
  • Program Memory (ROM): 4 KB (mask ROM)
  • RAM: 128 bytes
  • I/O Ports: 32 programmable I/O lines (4 ports)
  • Timers/Counters: 2 × 16-bit
  • Interrupts: 5 interrupt sources
  • Serial Communication: UART (serial port)
  • Operating Voltage: 4.5V to 5.5V
  • Package: Typically 40-pin DIP (Dual In-line Package)

Descriptions:

The 89C21 is an 8-bit microcontroller from National Semiconductor, compatible with the Intel 8051 architecture. It is designed for embedded control applications, featuring integrated program memory, RAM, timers, and serial communication capabilities.

Features:

  • 8051-compatible instruction set
  • On-chip oscillator
  • Boolean processing capabilities
  • Power-saving idle and power-down modes
  • Expandable external memory (up to 64 KB)
  • Industrial temperature range support

This microcontroller is commonly used in industrial control systems, automation, and consumer electronics.

*(Note: The 89C21 is an older microcontroller, and some details may vary based on specific revisions.)*

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