COP8SAA728N9

Overview

The COP8SAA728N9 is an 8-bit CMOS microcontroller from the COP8SA series, manufactured by National Semiconductor. It features 1k byte of OTP (One-Time Programmable) memory and 64 bytes of RAM. The device supports a maximum clock frequency of 10 MHz with instruction cycles as fast as 1 µs. It utilizes a modified Harvard architecture for efficient code execution. Available in a 28-pin package, it offers multiple I/O configurations including 12, 16, or 24 pins depending on the specific pinout assignment. Operating temperature ranges include commercial (0 to +70°C), extended industrial (-40 to +85°C), and automotive/industrial (-40 to +125°C).

Feature Summary

• High-speed single-cycle instruction execution with up to 10 MHz clock capability.
• Integrated 16-bit timer/counter supporting PWM, external event counting, and input capture modes.
• Built-in MICROWIRE/PLUS serial I/O interface compatible with SPI protocols.
• Low power consumption with HALT mode current typically below 4 µA.

Applications

• Battery-powered portable devices requiring low standby current.
• Industrial control systems needing robust I/O handling.
• Consumer electronics utilizing simple serial communication interfaces.
• Cost-sensitive embedded applications replacing older ROM-based controllers.

Procurement Notes

Verify the specific suffix codes against the manufacturer's official datasheet to confirm memory type, package style, and temperature grade. Ensure compatibility with existing development tools such as COP8 software and hardware programmers. Confirm that the OTP version meets the final production requirements since programming is irreversible. Check for any obsolete status notifications from National Semiconductor or Texas Instruments.

Selection Notes

Select this component when a direct replacement for COP800 series devices is required in new designs. Choose based on the necessary memory size (1k vs 2k vs 4k) and available I/O pin count. Consider the OTP variant for prototyping or low-volume production where mask ROM costs are prohibitive. Evaluate package options like CSP or DIP based on PCB layout constraints and thermal requirements.

Part Context

The COP8SA series represents an evolution of the popular COP800 family, offering enhanced performance while maintaining pin and instruction set compatibility. This series bridges legacy designs with modern low-power requirements. The inclusion of OTP technology provides flexibility during development phases. It serves as a cost-effective solution for applications transitioning from older 8-bit architectures without redesigning hardware interfaces.

Replacement Considerations

The COP8SAA728N9 is functionally compatible with the COP800 series. Specific cross-references should be verified using the official National Semiconductor compatibility matrix. Ensure that substitute parts maintain the same voltage range and package dimensions if physical replacement is intended.