Lesson 5 IC Datasheet 集成块数据表

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A datasheet is a document summarizing the performance and other technical characteristics of an electronic component [1]. A typical datasheet for an electronic component contains most of the following information: product name, manufacturer’s name, list of available packages and ordering codes, short functional description, pin connection diagram, absolute minimum/maximum ratings, recommended operating conditions, input/output waveshape diagram, timing diagram, physical dimensions, application circuit.

The following is a datasheet of 74LS00 integrated circuit.

General Description

This device contains four independent gates each of which performs the logic NAND function.

Ordering Code

Absolute Maximum Ratings

Recommend Operating Conditions

Switching Characteristics

New Words and Technical Terms

Notes to the Text

[1]A datasheet is a document summarizing the performance and other technical characteristics of an electronic component：summarizing现在分词短语修饰document。句子可以翻译为：（集成块）数据表是一个汇总了电子元件性能和其他技术特性的文档。

[2]Fairchild Semiconductor：美国仙童半导体公司。仙童半导体公司（Fairchild Semiconductor）创立于1957年，曾经是世界上最大和最富创新精神的半导体生产企业，为硅谷的成长奠定了坚实的基础。更重要的是，这家公司还为硅谷孕育了成千上万的技术人才和管理人才。

[3]74LS00 Quad 2-Input NAND Gate：74LS00是一个包含了四个“2输入与非门”的集成块。

[4]14-Lead Small Outline Package （SOP）：14条引线（引脚）的小外形封装。SOP是一种集成电路的封装技术，在这种封装中，引脚从芯片的两个较长的边引出，引脚的末端向外伸展。它是一种主要的表面封装类型，在具有较少引脚数目的集成电路中广泛使用，特别是存储器和模拟集成电路领域。

[5]14-Lead Plastic Dual-In-Line Package（PDIP）：14条引线（引脚）的塑料双列直插式封装。20世纪70年代流行的是双列直插封装，简称DIP封装，适合PCB的穿孔安装。Intel公司这期间的CPU如8086、80286都采用PDIP封装。这种封装尺寸远比芯片大，封装效率很低，占去了很多有效安装面积。

[6]inches (millimeters) ：英寸（毫米），括号前数值的单位是英寸，括号内数值的单位是毫米。如74LS00集成块的长度是0.335～0.344英寸（8.509～8.738毫米）。

Exercises

Ⅰ.Decide whether the following statement is true or false, and explain your answers.

1.An IC datasheet contains at least the following information: product name, short functional description, pin connection diagram, and application circuit.

2.A 74LS00 chip manufactured by Fairchild Semiconductor consists of four independent NOR gates.

3.In a 14-pin 74LS00 chip, each gate uses two pins for input and one pin for its output, and the remaining two contacts supply power (+5 V) and connect the ground.

4.The NAND function is equivalent to an AND function with a NOT function at the output. The output is 0 only if both inputs are 1; if one input is 1 and the other is 0, or if both inputs are 0, then the output is 1.

5.A signal must be at least 2V for 74LS00 chip to recognize logic ‘1’, while a signal must be no higher than 0.8V to recognize logic ‘0’.

6.IOH tells us that a logic ‘1’ output will allow up to 4.75A of current to flow, and IOL tells us that a logic ‘0’ output will allow up to 5.25A of current to flow.

7.The tPHL specification says that when the input conditions change such that the output must switch from ‘0’ to ‘1’ the delay is around 7ns (15ns maximum).

Ⅱ.Translate the following sentences into Chinese.

1.THREE-TERMINAL POSITIVE VOLTAGE REGULATOR IC7805 FEATURES:

OUTPUT CURRENT IN EXCESS OF 1A;

NO EXTERNAL COMPONENTS REQUIRED;

INTERNAL SHORT CIRCUIT CURRENT LIMITING;

INTERNAL THERMAL OVERLOAD PROTECTION.

2.LM324 consists of four independent high-gain frequency-compensated operational amplifiers that are designed specifically to operate from a single supply over a wide range of voltages.

3.ADC0804 is a very commonly used 8-bit analog to digital convertor. It can take only one analog signal as input. The digital outputs vary from 0 to a maximum of 255. The step size at 5V is 19.53mV (5V/255) , i.e., for every 19.53mV rise in the analog input, the output varies by 1 unit.

4.Definition of Package Pins (DAC0832) .

: Chip Select (active low) .

ILE: Input Latch Enable (active high) .

: Write. active low. is used to load the digital input data bits into the input latch.

IOUT: DAC Current Output.

VREF: Reference Voltage Input.

Ⅲ.Read more IC datasheets such as 74LS02, 74LS04, 7805, LM324, ADC0809, and DAC0832.