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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. These can be used in cases where the final output of a logic function only needs to sink current; a later section datashert give examples where this can be datxsheet. 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. Open collector gates have an interesting property, which is that they can be ANDed together just by wiring several outputs together.

These device types are designed to be used as memory address drivers.

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Motorola makes no warranty, representation or guarantee regarding. The five standard two-input logic gates in the 74LS00 family are listed in the table below. There are some other family offshoots; this list is those flavors of currently in production from one manufacturerTexas Instruments.

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. Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: 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. Latches The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch.


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 74LS00 family improves technically on the family in two key areas: Min Typ Max Unit.


There are plenty of other useful chips in the 74LS00 logic family, but these are some of the most useful building blocks. There are six of these on a single chip. Each has an output enable pin that can tri-state all the outputs. Motorola reserves the right to make changes without further notice to any products herein.

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.

Two-input logic gates The five standard two-input logic gates in the 74LS00 family are listed in the table below. You might use these variants if you want to count in decimal digits rather than pure binary.

At the very least, they provide you with a lot of different options for creating complex logic functions and circuits.

PDF 74LS540 Datasheet ( Hoja de datos )

If all outputs are off, the combination of signals is also off. Motorola products are not designed, intended, or authorized for use as components in.


Along the way I’ll also cover some additional chip characteristics that can be useful in complex designs. When the enable is “1” the buffer is driving the output; when the enable is “0,” the output is turned off “tri-stated”. The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source datashwet as much current.

Although less common, there are decimal versions of these chips. We’ve already spent time looking at the TTL logic family, even though I only introduced the first part in the family.

74LS Datasheet(PDF) – TI store

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 74ls5540 family; compare this to the family, which could only drive ten inputs in the same family.

Tri-state outputs allow multiple gates to “take turns” driving an output signal. These four-bit counter parts can count up or down. 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. This family arguably has the widest manufacturer support and range of available line of components.

Box ; Phoenix, Arizona The correct term for this is “high-impedance,” often shortened to dayasheet. Parts which are capable of having their output in any of these three states are considered to have “tri-state” outputs.

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

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