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So, how do thy actually works? And how the can act as a line driver? All I see in the inner structure is enables and input to outpuut wires. I think that in order to reduce the current that the FPGA suplies to the servo, I need to put the in between them, thus reducing the "effort" from the Altera.
Is that necessary? Or the Altera can provide a good current flow to the servo without damaging it's abilities? A line driver is simply a buffer. What you put in one end comes out the other. The increased current is able to overcome the capacitance caused by having many devices on a bus.
I'm not sure what you mean by "how it works". The datasheet tells you pretty much everything you need to actually use the part, though NXP does tend to be a bit sparse on internal details. Anyways, if you look around a bit, you can find some slightly better datasheets that have more detailed internal diagrams. If you want more detail, you should start reading about how transistors work, and how they're used to make the logic gates in the shown diagram.
The first is to provide a power gain. The circuits that are driving the inputs may not have the power to drive the impedance of a longer wire length. This chip does not perform any logical function; it is just giving the signal a strength boost. The line driver also serves to isolate the local circuits from electrostatic discharge from connections that might go off the board. The second functionality is that it has a tristate output, which means that when the enable pin is not asserted the chip does not drive the output signal at all.
It's as if the chip were disconnected from the wire. This allows you to have multiple line drivers on the same wire, and as long as they properly take turns driving it they can share the single connection. Tristate mode also saves power by not driving the line when there is nothing to send. It should be noted that the device identified above is a "tri-state" driver. This means that it can set the line "high", "low", or can effectively disconnect itself from the line.
This is used in situations where any of several components can "drive" the bus though hopefully not more than one at a time. The enable function is common to all four drivers and offers the choice of an active-high or active-low enable G, G input. Low-power Schottky circuitry reduces power consumption without sacrificing speed.
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How does a Line Driver actually works? Ask Question. Asked 5 years, 7 months ago. Active 4 years, 5 months ago. Viewed 13k times. Eminem Eminem 1 1 gold badge 3 3 silver badges 9 9 bronze badges. It sounds like you're looking for a equivalent circuit. That power is used by each buffer element to increase the load it can drive.
Active Oldest Votes. You can think of it as the logic gate equivalent of an amplifier. Majenko Majenko I mean, how the can increase the current with just sending the input to the output? What do you think a buffer is? Connor Wolf Connor Wolf Jeff Bell Jeff Bell 1 1 silver badge 4 4 bronze badges. Hot Licks Hot Licks 4 4 silver badges 8 8 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook.
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TC74HC244AP Datasheet PDF
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