74LS Absolute Maximum Ratings(Note 1). Note 1: The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be. 74LS02 is a LOGIC GATE IC and member of 74XXYY IC series which are logic Where to use 74LS02 IC 74LS02 NOR Gate IC Datasheet. 74LS02 datasheet, 74LS02 pdf, 74LS02 data sheet, datasheet, data sheet, pdf, Fairchild Semiconductor, Quad 2-Input NOR Gate.

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Design your application so that the product is used within the ranges guaranteed by Hitachi particularly.

The chipis basically used when NOR logic function is required. Even within xatasheet guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as fail- safes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product.

Submitted by admin on 5 April In that state the current flow through base of both transistors will be zero. Because transistor drop is zero Y1 will be LOW. Because of this the chip can be used high speed applications. In the circuit two transistors are connected to form a NOR gate.

No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without. Both transistors will be ON and voltage across both of them will be zero. Here are a few cases why it is used. When both buttons are pressed.


Hitachi bears no responsibility for failure or damage when used.

74LS02 Datasheet

The chip has four NOR gates in it. Hitachi makes every attempt to ensure that its products are of high quality and reliability. With that the total drop across both transistors will be zero. For further information write to: The buttons are connected to change the logic of inputs. 774ls02 North Road, Taipei Tokyo 03 Fax: Output of the gate is taken out from joint collector of both transistors.

Hitachi Semiconductor America Inc. This output is connected to a LED trough a current limiting resistor.

74LS02 NOR Gate IC Pinout, Features, Equivalents, Circuit & Datasheet

For realizing the above truth table let us take simplified NOR gate and have it connected as shown below.

The chip also provides TTL outputs which are a must in some systems. We can use one or all gates. Like this we can use each gate of the chip depending on requirement. The four NOR gates datasheef the chip mentioned earlier are connected internally as shown below. Where high speed NOR operation is necessary. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. Design your application dafasheet that the product is used within the ranges guaranteed datasheer Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics.


When both buttons are not pressed. This LED is connected to detect the state of output. VCC-Connected to positive voltage to provide power to all four gates.

Hitachi Asia Hong Kong Ltd.

Confirm that you have received the latest product standards or specifications before final design, dqtasheet or use. The description for each pin is given below. TL — Programmable Reference Voltage.

After verifying the three states, you can tell that we have satisfied the above truth table. The chip is available in different packages and is chosen depending on requirement. These two inputs are connected to buttons. Products and product specifications may be subject to change without notice.

Even within the guaranteed ranges, consider normally foreseeable. Now let us consider a few states: With them the switching delays of gates are minimized. Copyright ‘ Hitachi, Dahasheet. The two inputs are driven out from bases of two transistors. This product is not designed to be radiation resistant.

Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges.

PDF 74LS02 Datasheet ( Hoja de datos )

Confirm that you have. When you want logic inverter. It is really popular and is available everywhere. When one of buttons is pressed.

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