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Motorola reserves the right to make changes without further 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.
The 74LS00 family improves technically on the family in two key areas: At the very least, they provide you with a lot of different options for creating complex logic functions and circuits.
The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source half as much current. 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. 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.
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The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch. 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. However, if you were picking a single “best” logic family today it would probably have to be the 74LS00 family.
You might use these variants if you want to count in decimal digits rather than pure binary. Min Typ Max Unit. These device types are designed to be used as memory address drivers. Box ; Phoenix, Arizona The five standard two-input logic gates in the 74LS00 family are listed in the table below.
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. Although less common, there are decimal versions of these chips. There is a CLR input to reset the counter to These devices are especially useful as output datasneet for the microprocessors, allowing ease of layout and greater PC board density.
The correct term for this is “high-impedance,” often shortened to “high-Z. These chips have convenient pin-outs separating the input side from the output side.
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. Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: 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 数据手册 ( 数据表 ) – Motorola => Freescale
Motorola products are not designed, intended, or authorized for use as components in. We’ve already spent time looking at the TTL logic family, even though I only introduced the first part in the family.
Should Buyer purchase or use Motorola products for any such. If all outputs are off, the combination of signals is also off. These can be dattasheet in cases where the final output of a logic function only needs to sink current; a later section will give examples where this can datashest used.
Motorola does not convey any license under its patent rights nor the rights of others. Open collector gates have an interesting property, which is that they can be ANDed together just by wiring several outputs together.
74LS 데이터시트(PDF) – TI store
Along the way I’ll also cover some additional chip characteristics that can be useful in complex designs. Motorola makes no warranty, representation or guarantee regarding. There are plenty of other useful chips in the 74LS00 logic family, but these are some of the most useful building blocks.