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However part of the current reduction in the 74LS00 family was on inputs, such that a typical 74LS00 family part can drive twenty LS loads that is, one output can fan out to twenty inputs within the 74LS00 family; compare this to the family, which could only drive ten inputs in the same family. 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.

There are plenty of other useful chips in the 74LS00 logic family, but these are some of the most useful building blocks. Motorola and are registered trademarks of Motorola, Inc. As long as other logic determines that no more than one output is driving the same signal at the same time, all is well. There is a CLR input to reset the counter to Many of the basic logic functions are also available in parts with “open datasheer outputs.

These chips have convenient pin-outs separating the input side from the output side. Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: This dstasheet a modified output circuit within the chip which sinks current to indicate a logic “0,” but turns off to indicate a logic “1.


74LS540 数据手册 ( 数据表 ) – Motorola => Freescale

Motorola makes no warranty, representation or guarantee regarding. Although less common, there are decimal versions of these chips. The five standard two-input logic gates in the 74LS00 family are listed in the table below. We’ve already spent time looking at the TTL logic family, even though Datassheet only introduced the first part in the family.

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74LS Datasheet(PDF) – TI store

Motorola makes no warranty, representation or 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. These four-bit counter parts can count up or down. Min Typ Max Unit. The truth tables for the 74LS and 74LS introduce a new symbol, “Z,” which represents the “off” state.


Two-input logic gates The five standard two-input logic gates in the 74LS00 family are listed in the table below. The correct term for this is “high-impedance,” often shortened to “high-Z. 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.

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. 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.

74LS540 Datasheet PDF

The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch. At the very least, 74l540 provide you with a lot of different options for creating complex logic functions and circuits. These devices are especially useful as output ports for the microprocessors, allowing ease of layout and greater PC dayasheet density. Along the way I’ll also cover some additional chip characteristics that can be useful in complex designs. The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source half as much current.

Schematics and Components Previous: You might use these variants if you want to count in decimal digits rather than pure binary.

A tri-state buffer or 74lw540 buffer looks like a regular buffer or inverter, except there is an additional “enable” control signal entering the gate. 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.

The 74LS00 family We’ve already spent time looking at the TTL logic family, even though I only introduced the first part in the family. However, if you were picking a single “best” logic family today it would probably have to be dataasheet 74LS00 family. There are some other family offshoots; this list is those flavors of currently in production from one manufacturerTexas Instruments. Latches The 74LS is an 74le540 transparent latch, while the 74LS is an eight-bit edge-triggered latch.

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. For dxtasheet long time, the original series was the best choice as a general-purpose logic family, and the family had more members than any of the offshoot families.


Open collector gates have an interesting property, which is that they dagasheet be ANDed together just by wiring several outputs together. Tri-state outputs allow multiple gates to “take turns” driving an output signal.

Because tri-state buffers have many applications in microprocessor circuits, there are several useful chips available which are designed to function on eight data signals bits at one time. The series was very successful and very popular, to the datadheet 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.

Outputs Q0 through Q3 are a binary value, where Eatasheet is the datasueet signifigant bit and Q3 is most significant. Motorola products are not designed, intended, or authorized for use as components in. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly datashwet indirectly, 74l540 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 datashwet.

Parts which are capable of having their output in any of these three states are considered to have “tri-state” outputs. When the enable is “1” the buffer is driving the output; when the enable is “0,” the output is turned off “tri-stated”. The 74LS00 family improves technically on the family in two key areas: This section introduces a number of useful digital logic chips for use in a variety of projects.

Motorola reserves the right to make changes without further notice to any products herein. This family arguably has the widest manufacturer support and range of available line of components. These device types are designed to be used as memory address drivers. This method of combining multiple outputs on the same signal path is used heavily in microprocessor circuits, where vatasheet different memory or input circuits may be sharing a common set of data signals.

Each has an output enable pin that can tri-state all the outputs. If all outputs are off, the combination of signals is also off.