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The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source half as much current. For a long time, datashwet original series was the best choice as a general-purpose logic family, and the family had more members than any of the offshoot families.

Motorola and are registered trademarks of Motorola, Inc. Min Typ Max Unit. This method 74ls5400 combining multiple outputs on the same signal path is used heavily in microprocessor circuits, where several different memory or input circuits may be sharing datasbeet common set of data signals. Since open collector is often used where “0” is the active state, this is also called a “wired-OR” connection, referring to an active-low OR function. The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch.

These device types are designed to be used as memory address drivers. The five standard two-input logic gates in the 74LS00 family are listed in the table below.

Latches The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch. Since a regular TTL logic gate sources current for “1” and sinks current for “0,” a signal where neither of these is happening the signal is “off,” like in open collector outputs can actually be thought of as 74lls540 a third state.

The eight-bit buffers 74LS and 74LS are functionally equivalent to the widely used 74LS and 74LS; however the ‘ and ‘ have a more confusing pin-out to trip the unwary student.

When the enable is “1” the buffer is driving the output; when the enable is “0,” the output is turned off 74lss540. Motorola products are not designed, intended, or authorized for use as components in.

Datasheet 74LS – Tài liệu text

A tri-state buffer or inverting buffer looks like a regular buffer or inverter, except there is an additional “enable” control signal entering the gate. Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: Motorola does not convey any license under its patent rights nor the rights of others.


As long as other logic determines that no more than one output is driving the same signal at the same time, all is well. The 74LS00 family improves technically on the family in two key areas: Many of the basic logic functions are also available in parts with “open collector” outputs.

The series was very successful and very popular, to the extent that when companies want to manufacture new logic parts with different electrical characteristics, they typically create new families of the very same functions and pin-outs.

These can be used in cases where the final output of a logic function only needs to sink current; a later section will give examples where this can be used. These chips have convenient pin-outs separating the input side from the output side.

We’ve already spent time looking at the TTL logic family, even though I only introduced the first part in the family. These four-bit counter parts can count up or down.

Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur.

Motorola makes no warranty, representation dataseet guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages.

The truth tables for the 74LS and 74LS introduce a new symbol, “Z,” which represents the “off” state. Box ; Phoenix, Arizona The correct term for this is “high-impedance,” often shortened to “high-Z. Tri-state outputs allow multiple gates to “take turns” driving an 74lx540 signal. There are plenty of other useful chips in the 74LS00 logic family, but these are some of the most useful building blocks.

74LS Datasheet ON Semiconductor pdf data sheet FREE from

There is a CLR input to reset the counter to There are six of 7ls540 on a single chip. Should Buyer purchase or 74ls5440 Motorola products for any such. There are some other family offshoots; this list is those flavors of currently in production from one datashertTexas Instruments. Motorola makes no warranty, representation or guarantee regarding. Motorola reserves the right to make changes without further notice to any products herein.


You might signal a logic function to drive its output high or low as the function may determineand then later tell that function to turn off its output so that a different function may drive the signal instead. This family arguably has the widest manufacturer support and range of available line of components.

If all outputs are off, the combination of signals is also off. Should Buyer purchase or use Motorola products for any such unintended catasheet unauthorized application, Buyer shall indemnify and hold Motorola datashset its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.

The 74LS is identical to the 74LS except it only counts from 0 through 9 through binary ; the 74LS is similarly identical to the 74LS except for the limited range.

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Although less common, there are decimal versions of these chips. This is a modified output circuit within the chip which sinks current to indicate a logic “0,” but turns off to indicate a logic “1. At the very least, they provide you with a lot of different options for creating complex logic functions and circuits. However, if you were picking a single “best” logic family today it would probably have to be the 74LS00 family.

Each has an output enable pin that can tri-state all the outputs. Parts which are capable of having their output in any of these three states are considered to have “tri-state” outputs.