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Datashete logic gates 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 I only introduced the first part in the family. 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.

PDF 74LS540 Datasheet ( Hoja de datos )

Parts which are capable of having their output in any of these three states are considered to have “tri-state” outputs.

These device types are designed to be used as memory address drivers. Motorola products are not designed, intended, or authorized for use as components in. Motorola does not convey any license under its patent rights nor the rights of others.

This family arguably has the widest manufacturer support and range of available line of components. There are some other family offshoots; this list is those flavors of currently in production from one manufacturerTexas Instruments.

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.

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.

74LS Datasheet(PDF) – Motorola, Inc

Motorola and are registered trademarks of Motorola, Inc. When the enable is “1” the buffer is driving the output; when the enable is “0,” the output is turned off “tri-stated”. These four-bit counter parts can count up or down.


Since open collector is often datashewt where “0” is the active state, this is also called a “wired-OR” connection, referring to an active-low OR function. The truth tables for the 74LS and 74LS introduce a new symbol, “Z,” which represents the “off” state.

Box ; Phoenix, Arizona There are six of these on a single chip. Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: There are plenty of other useful chips in the 74LS00 logic family, but these are some of the most useful building blocks. 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 being a third state.

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

Along the way I’ll also cover some additional chip characteristics that can be useful in complex designs. If all outputs are off, the combination of signals is also off. As long as other datashheet determines that no more than 774ls540 output is driving the same signal at the same time, all is well.

This section introduces a number of useful digital logic chips for use in a variety of projects. Many of the basic logic functions are also available in parts with “open collector” outputs.

Tri-state outputs allow multiple gates to “take turns” driving an output signal. 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. There is a CLR input to reset the counter to Should Buyer purchase or use Motorola products for any such.

This method of combining multiple outputs on the same signal path is used heavily in microprocessor circuits, where several different memory or input circuits may be sharing a common set of data signals. The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source half as much current.

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.


For a long time, the original series was the best choice 74ls450 a general-purpose logic family, and the family had more members than any of the offshoot families. These devices are especially useful as output ports for the microprocessors, allowing ease of layout and greater PC board density. 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.

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. Motorola makes no warranty, representation or guarantee regarding.

Motorola products catasheet not designed, intended, or authorized for datasheet 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 reserves the right to make changes without dataeheet notice to any products herein. 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.

However, if datashheet were picking a single “best” logic family today satasheet would probably have to be the 74LS00 family. 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 74LS00 family improves technically on the family in two key areas: