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Schematics and Components Previous: Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, 774ls540 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 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.

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. The 74LS00 family improves technically on the family in two key areas: The correct term for this is “high-impedance,” often shortened to “high-Z.

Many of the basic logic functions are also available in parts with “open collector” outputs. 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.


There is a CLR input to reset the counter to Box ; Phoenix, Arizona 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.


Motorola 47ls540 are not designed, intended, or authorized for use as components in. Latches The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch.

Along the way I’ll also cover some additional chip characteristics that can be useful in complex designs. There are some other family offshoots; this list is those flavors of currently in production from one datadheetTexas Instruments.

Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch. However, if you were picking a single “best” logic family today it would probably have to be the 74LS00 family.

At the very least, they provide you with a lot of different options for creating complex logic functions and circuits. Open collector gates have an interesting property, which is that they can be ANDed together just by wiring several outputs together. These can be used in cases where the final output of a logic dafasheet only needs to sink current; a later section will give examples where this can be used.

Datasheet 74LS – Tài liệu text

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. Since open collector is often used where “0” is the active state, this is also 74ls5400 a “wired-OR” connection, referring to an active-low OR function. 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.



Outputs Q0 through Q3 are a binary value, where Q0 is the least signifigant bit and Q3 is most significant. 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 datasheeg of the very same functions and pin-outs. Motorola dqtasheet the right to make changes without further notice to any products herein.

The truth tables for the 74LS and 74LS introduce a new symbol, “Z,” which represents the “off” state. There are six of these on a single chip. Datsaheet 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.

Although less common, there are decimal versions of these chips.

Motorola makes no warranty, representation or guarantee regarding. 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. As long as other logic determines that no more than one output is driving the same signal at the same time, all is well.

Min Typ Max Unit.