了解直流电气特性的微控制器-Understanding DC

文章摘要：Abstract: This tutorial explains all of the DC characteristics as found in the Dallas Semiconductor DS80C320 high-speed microcontroller data sheet. This information is also applicable to other Dallas Semiconductor microcontrollers, such as the DS80C310, DS87C520, DS87C530, DS80C390 and DS89C450. Ove

了解直流电气特性的微控制器-Understanding DC,标签：计算机控制技术,工厂电气控制技术,http://www.88dzw.com
Abstract: This tutorial explains all of the DC characteristics as found in the Dallas Semiconductor DS80C320 high-speed microcontroller data sheet. This information is also applicable to other Dallas Semiconductor microcontrollers, such as the DS80C310, DS87C520, DS87C530, DS80C390 and DS89C450.

Overview

For the inexperienced designer, understanding the electrical characteristics presented in an integrated circuit data sheet can be confusing. If misinterpreted, a new design could prove disastrous. This tutorial is intended to demystify the steady state characteristics of the Maxim microcontroller product family.

The DS80C320 is only one of numerous high-speed microcontrollers Maxim offers. By understanding the DC characteristics of this microcontroller, the novice designer has a better appreciation for other microcontrollers with added features.

Absolute Maximum Rating

The Absolute Maximum Rating section of the DS80C320 data sheet describes the stress conditions relative to the device. These parameters do not set the maximum and minimum operating conditions the device tolerates over extended periods of time. Instead, they are the limiting operational and environmental conditions the device was stressed. If the device is exposed to these parameters for extended periods of time, no guarantee is made and device reliability device can be affected. For example, during the assembly process of a printed circuit board, the microcontroller was exposed to a solder temperature of +180°C for 15 seconds. The absolute maximum rating states soldering temperature is +160°C for 10 seconds. In this case, the microcontroller's reliability has been compromised.

DC Electrical Characteristics

The DC Electrical Characteristics found in the table are specific to a temperature range and operating voltage. The temperature range applies to both the commercial (0°C to +70°C) and industrial specifications (-40°C to +85°C).

This application note looks at the DC Electrical Characteristics table for the DS80C320 microcontroller and examines all of the parameters of this device and what they mean to designers.

The table is broken into seven columns labeled Parameter, Symbol, Minimum (Min), Typical (Typ), Maximum (Max), Unit, and Notes. The numbers in the Notes column point to a description of conditions associated with the values given in the table. These are found immediately following the DC Electrical Characteristics table. It is important to understand these conditions.

DS80C320 DC Electrical Characteristics

PARAMETER	SYMBOL	MIN	TYP	MAX	UNITS	NOTES
Operating Supply Voltage	VCC	4.5	5.0	5.5	V	1

The operating supply voltage is the voltage applied to the VCC pin on the microcontroller from the power supply. Typical voltage for a digital device is +5.0V ±10%, thus the min and max rating. It should be noted that a clean, regulated supply should be used in any digital design. Noise, such as voltage spikes, affect the reliability of the device if it exceeds the absolute maximum rating established at the beginning of the data sheet. Note 1 specifies all voltages are referenced to ground.

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