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如何阅读芯片数据手册

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  • 日期: 2017-09-11
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标签: 电子芯片初学者数据手册

非常适合初学者的电子用书!减少电子工程必经的弯路,希望对您有帮助!

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How to Read a Datasheet Prepared for the WIMS outreach program 5602 D Grover In order to use a PIC microcontroller a flipflop a photodetector or practically any electronic device you need to consult a datasheet This is the document that the manufacturer provides telling you the typical device performance minimum and maximum requirements and characteristics what you can do to the device without harming it suggested uses and hints Manufacturers want you the designer to have ......

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 document that the manufacturer provides telling you the typical device performance • • minimum and maximum requirements and characteristics • what you can do to the device without harming it • suggested uses and hints Manufacturers want you, the designer, to have a successful experience with their device. They are trying to be helpful. They don’t always succeed. The datasheet on the following pages is a relatively good datasheet. It tries to concisely tell you everything you need to know about the device, a common 555 timer chip (the duct-tape of the electronics hobbyist). Most datasheets for ICs follow the same general layout. You don’t have to understand everything in a datasheet. There’s a lot of information that might not be of any use to you. The annotations that follow try to point out parts of the datasheet that you should pay particular attention 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.com. What is the LM555? The LM555 is a timer chip that uses external resistors and capacitors to generate either a single pulse of a certain duration, or a continuous sequence of pulses with a variety of pulse widths possible. Because it is a very general purpose collection of functional blocks such as comparators, a flip-flop, internal voltage divider, high power output stage, and so on, a number of different timing-related functions are possible. Entire books have been written about the 555, though it is often used when another IC would work better. (See for example the CD4538 timer chip.) February 2000 L M 5 5 5 i T m e r Features n Direct replacement for SE555/NE555 n Timing from microseconds through hours n Operates in both astable and monostable modes n Adjustable duty cycle n Output can source or sink 200 mA n Output and supply TTL compatible n Temperature stability better than 0.005% per ˚C n Normally on and normally off output n Available in 8-pin MSOP package Applications n Precision timing n Pulse generation n Sequential timing n Time delay generation n Pulse width modulation n Pulse position modulation n Linear ramp generator LM555 Timer General Description The LM555 is 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. Schematic Diagram DS007851-1 © 2000 National Semiconductor Corporation DS007851 www.national.com 5 5 5 M L Connection Diagram Dual-In-Line, Small Outline and Molded Mini Small Outline Packages Top View DS007851-3 Ordering Information Package 8-Pin SOIC 8-Pin MSOP 8-Pin MDIP Part Number LM555CM LM555CMX LM555CMM LM555CMMX LM555CN Package Marking Media Transport NSC Drawing LM555CM LM555CM Z55 Z55 LM555CN Rails 2.5k Units Tape and Reel 1k Units Tape and Reel 3.5k Units Tape and Reel Rails M08A MUA08A N08E www.national.com 2 Absolute Maximum Ratings (Note 2) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Power Dissipation (Note 3) LM555CM, LM555CN LM555CMM Operating Temperature Ranges LM555C Storage Temperature Range +18V 1180 mW 613 mW 0˚C to +70˚C −65˚C to +150˚C Electrical Characteristics (Notes 1, 2) (TA = 25˚C, VCC = +5V to +15V, unless othewise specified) Conditions Parameter Supply Voltage Supply Current Timing Error, Monostable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Timing Error, Astable Initial Accuracy Drift with Temperature Accuracy over Temperature Drift with Supply Threshold Voltage Trigger Voltage Trigger Current Reset Voltage Reset Current Threshold Current Control Voltage Level Pin 7 Leakage Output High Pin 7 Sat (Note 7) Output Low Output Low VCC = 5V, RL = ¥ VCC = 15V, RL = ¥ (Low State) (Note 4) RA = 1k to 100kW , C = 0.1µF, (Note 5) RA, RB = 1k to 100kW C = 0.1µF, (Note 5) , VCC = 15V VCC = 5V (Note 6) VCC = 15V VCC = 5V VCC = 15V, I7 = 15mA VCC = 4.5V, I7 = 4.5mA Soldering Information Dual-In-Line Package Soldering (10 Seconds) Small Outline Packages (SOIC and MSOP) Vapor Phase (60 Seconds) Infrared (15 Seconds) L M 5 5 5 260˚C 215˚C 220˚C See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” for other methods of soldering surface mount devices. Limits LM555C Typ Min 4.5 3 10 1 50 1.5 0.1 2.25 150 3.0 0.30 0.667 5 1.67 0.5 0.5 0.1 0.1 10 3.33 1 180 80 0.4 9 2.6 Units V mA % ppm/˚C % %/V % ppm/˚C % %/V x VCC V V µA V mA µA V nA mV mV Max 16 6 15 0.9 1 0.4 0.25 11 4 100 200 3 www.national.com 5 5 5 M L Electrical Characteristics (Notes 1, 2) (Continued) (TA = 25˚C, VCC = +5V to +15V, unless othewise specified) Conditions Parameter Limits LM555C Typ Min Output Voltage Drop (Low) Output Voltage Drop (High) Rise Time of Output Fall Time of Output VCC = 15V ISINK = 10mA ISINK = 50mA ISINK = 100mA ISINK = 200mA VCC = 5V ISINK = 8mA ISINK = 5mA ISOURCE = 200mA, VCC = 15V ISOURCE = 100mA, VCC = 15V VCC = 5V 12.75 2.75 0.1 0.4 2 2.5 0.25 12.5 13.3 3.3 100 100 Max 0.25 0.75 2.5 0.35 Units V V V V V V V V V ns ns Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is func- tional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guar- antee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. Note 3: For operating at elevated temperatures the device must be derated above 25˚C based on a +150˚C maximum junction temperature and a thermal resistance of 106˚C/W (DIP), 170˚C/W (S0-8), and 204˚C/W (MSOP) junction to ambient. Note 4: Supply current when output high typically 1 mA less at VCC = 5V. Note 5: Tested at VCC = 5V and VCC = 15V. Note 6: This will determine the maximum value of RA + RB for 15V operation. The maximum total (RA + RB) is 20MW Note 7: No protection against excessive pin 7 current is necessary providing the package dissipation rating will not be exceeded. Note 8: Refer to RETS555X drawing of military LM555H and LM555J versions for specifications. . www.national.com 4
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jytomcat
资料不错 ,刚好是我需要的。谢谢上传者
2017-09-16 08:15:41回复
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