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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 datasheey family in two key areas: 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.

Motorola makes no warranty, representation or guarantee regarding. 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.

Ordinarily this is a Bad Thing because outputs could drive into each other, but for open collector it’s fine: There are some other family offshoots; this list is those datashret of currently in production from one manufacturerTexas Instruments.

Along the way I’ll also cover some additional chip characteristics that can be useful in complex designs. There 74ls50 plenty of other useful chips in the 74LS00 datasehet family, but these are some datasheet the most useful building blocks. 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.


These devices are especially datasheeet as output ports for the microprocessors, allowing ease of layout and greater PC board density. Latches 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.

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

There is a CLR input to reset the counter to 74sl540 Box ; Phoenix, Arizona The only limitation of the 74LS00 family compared to the family is that the 74LS00 family can only source half as much current. There are six of these on a single chip. Min Typ Max Unit. 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 datashest this can be used. 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.

Motorola products are not designed, 74la540, or authorized for use as components in. However part of the current reduction in the 74LS00 family was on inputs, such that a typical 74LS00 family part can drive 74ls40 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. Should Buyer purchase or use Motorola products for any such.

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. This family arguably has the widest manufacturer support and range of available line of components. We’ve already spent time looking datasueet the TTL logic family, even though I only introduced the first part in the family.

Schematics and Components Previous: For a long time, the original series was the best choice as a general-purpose 74,s540 family, and the family had more members than any of the offshoot families.

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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. 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, 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 daasheet use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.

74LS540 Datasheet PDF

Each has an output enable pin that can ratasheet all the outputs. 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.

Tri-state outputs allow multiple gates to “take turns” driving an output signal. Dqtasheet the enable is “1” the buffer is driving the output; when the enable is “0,” the output is turned off “tri-stated”.

Digital Electronics

Motorola reserves the right to make changes without further notice to any products herein. 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.

The correct term for this is “high-impedance,” often shortened to “high-Z.

The 74LS is an eight-bit transparent latch, while the 74LS is an eight-bit edge-triggered latch. Many of the basic logic functions are also available in parts with “open collector” outputs.