How to Read a Datasheet
Prepared for the WIMS outreach program
5/6/02, D. Grover
In order to use a PIC microcontroller, a flip-flop, a photodetector, or practically any electronic device, you need to consult a datasheet.  This is the
to.
Where do you find datasheets?  Nowadays you can find almost any datasheet on the internet, often in PDF (Acrobat) form.  For example, the LM555 datasheet from National Semiconductor is on their website at www.national.
LM555Timer
General Description
The LM555is a highly stable device for generating accurate time delays or oscillation.Additional terminals are provided for triggering or resetting if desired.In the time delay mode of operation,the time
is precisely controlled by one external re-sistor and capacitor.For astable operation as an oscillator,the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor.The circuit may be triggered and reset on falling waveforms,and the output circuit can source or sink up to 200mA or drive TTL circuits.
Features
n Direct n Timing n Operates n Adjustable n Output n Output n Temperature n Normally n Available Applications
n Precision n Pulse n Sequential DS007851-1
©2000National Semiconductor Corporation DS007851www.national
有时常规描述（General
Description ）会给出一些其它地方没提到的特性或者用法。特性（确认电气特性所在的条件以及特殊情况。
通常叫做等效原理图，该原理不是该芯片中必须的，但是该芯片将按照里面的来运作。它能帮助解释在
数据手册中未被描述的行为。能把这个电路在面包板上搭出来吗？除非您知道那些并未给出参数的晶体管的参数。
总会有一个日期。数据手册变动，尤其是预备版或者修正版，核对一下日期。
5
5
5
M
L
DS007851-3
Top View
Number Package Marking Media Transport
LM555CM LM555CM Rails
LM555CMX LM555CM  2.5k Units Tape
LM555CMM Z551k Units Tape
LM555CMMX Z55  3.5k Units Tape
LM555CN LM555CN Rails
Ordering Information ）下，可以到带有完整零件编号的该器件的每个变种列表。通常开始的几个字母是行业标准或者厂商标识, 接着的是常规标识（“555”）。后缀通常给出封装类型（贴片安装型或直插型），温度范围（宽范围型，当然也会更贵），速度（快速型，更贵），以及其它各种如功耗，电压范围等等。
mui框架如何使用
--相关器件，如它可替换的，可直接替换的，或者可以被其它替换的器件
--提供编程或者配置该器件的信息（寄存器等）
--与其它器件之间的连接（包括输入/输出特性）
www.national2
3
www.national
www.national4

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。