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Maxim > Design Support > Technical Documents > Application Notes > Microcontrollers > APP 1087
Keywords: high-speed microcontroller, DS5000, DS5000T, DS5000FP, DS5001FP, DS5002FP, DS2250,
DS2250T, DS2251T, dc characteristics, absolute maximum rating, power-fail warning, power-fail reset,
bandgap reference, stop mode, XTAL1, microcontrollers, micorcontro
APPLICATION NOTE 1087
Micro Tutorial 1: Understanding DC Electrical
Characteristics of Microcontrollers
Jun 04, 2002
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).
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