74LS540 DATASHEET PDF

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Along the way I’ll also cover some additional chip characteristics that can datazheet useful in complex designs. These devices are especially useful as output ports for the microprocessors, allowing ease of layout and greater PC board density. 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.

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 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch. 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.

The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source half as much current.

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Motorola makes no warranty, representation or guarantee regarding. Ordinarily this is a Bad Thing because outputs 47ls540 drive into each other, but for open collector it’s fine: There is a CLR input to reset the counter to These four-bit counter parts can count up or down. Each has an output enable pin that can tri-state all the outputs.

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Although less common, there are decimal versions of these chips. These chips have convenient pin-outs separating the input side from the output side.

Box ; Phoenix, Arizona Should Buyer purchase or use Motorola products for any such. Min Typ Max Unit. The correct term for this is “high-impedance,” often shortened to “high-Z. This family arguably has the widest manufacturer support and range of available line of components.

The 74LS00 family We’ve already spent datashewt looking at the TTL logic family, even though I only introduced the first 74ls40 in the family. Motorola and are registered trademarks of Motorola, Inc. These device types are designed to be used as memory address drivers. However part of the current reduction in the 74LS00 daatsheet 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.

If all outputs are off, the combination dwtasheet signals is also off. Outputs Q0 through Q3 are a binary value, where Q0 is the least signifigant bit and Q3 is most significant.

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For a 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. You might use these variants if you want to count in dayasheet digits rather than pure binary. You satasheet signal a logic function to drive its output high or low as the function may determineand then datazheet tell that function to turn off its output so that a different function may drive the signal instead.

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

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Schematics and Components Previous: 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, 74ks540, 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.

This section introduces a number of useful digital logic datxsheet for use in a variety of projects. This method of combining multiple outputs on the 74ls54 signal path is used heavily in microprocessor circuits, where several different memory or input circuits may be sharing a common set of data signals.

Open collector gates have an interesting property, which is that they can be ANDed together just by wiring several outputs together. There are six of these on a single chip.

74LS, datasheet & applicatoin notes – Datasheet Archive

Tri-state outputs allow multiple gates to “take turns” driving an 74os540 signal. There are some other family offshoots; this list is those flavors of currently in production from one manufacturerTexas Instruments. The five standard two-input logic gates in the 74LS00 family are listed in the table below.