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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Because transistor drop is zero Y1 will be LOW.

74LS02 Datasheet(PDF) – Hitachi Semiconductor

When both buttons are pressed. With that the total drop across both transistors will be zero.

This LED is connected to detect the state of output. Now let us consider a few states: The chip has four NOR gates in it. Like this we can use each gate of the chip depending on requirement. This output is connected to a LED trough a current limiting resistor. After verifying the three states, you can tell that we have satisfied the above truth table.

Hitachi Semiconductor America Inc. This product is not designed to be radiation resistant. Both transistors will be ON and voltage across both of them will be zero. The buttons are connected to change the logic of inputs.

74LS02 Datasheet PDF

Because of this the chip can be used high speed applications. Confirm that you have received the latest product standards or specifications before final design, purchase or use.


Hitachi bears dxtasheet responsibility for failure or damage when used. VCC-Connected to positive voltage to provide power to all four gates. The description for each pin is given below.

No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi.

The chip also provides TTL outputs which are a must in some systems. In that state the current flow through base of both transistors will be zero. Hitachi Asia Hong Kong Ltd. Here are a few cases why it is used. When you want logic inverter. No one is permitted to reproduce or duplicate, in any form, datashet whole or part of this document without.

Hitachi makes every attempt to ensure that its products are of high quality and reliability. In the circuit two transistors are connected to form a NOR gate. Confirm that you have. When both buttons are not pressed. Copyright ‘ Hitachi, Ltd. It is really popular and is available everywhere. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. The two inputs are driven out from bases of two transistors. The four NOR gates in the chip mentioned earlier are connected internally as shown below.

Tokyo 03 Fax: Even within the guaranteed ranges, consider normally foreseeable.

The chipis basically used when NOR logic function is required. We can use one or all gates.


For realizing the above truth table let us take simplified NOR gate and have it connected as shown below. Submitted by admin on 5 April TL — Programmable Reference Voltage.

adtasheet Design your application so that the product is used within the ranges guaranteed by Hitachi particularly. With them the switching datasheeh of gates are minimized. Products and product specifications may be subject to change without notice.

Tun-Hwa North Road, Taipei Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics.

For further information write to: These two inputs are connected to buttons.

74LS02 datasheet & applicatoin notes – Datasheet Archive

Where high speed NOR operation is necessary. Even within the 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.

When one of buttons 74s02 pressed. Output of the gate is taken out from joint collector of both transistors. The chip is available in different packages and is chosen depending on requirement.