SN74HC (ACTIVE) Octal Buffers And Line Drivers With 3-State Outputs. Datasheet ( KB). Diagram click to expand contents. Functional Diagram. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters . 2 × fo) where: 74HC; 74HCT Octal buffer/line driver; 3-state. Product data sheet. Table 1: Quick reference data. GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns.

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In case it’s the apparent lack of power to the chip that’s confusing you: The circuits that are driving the inputs may not have the power to drive the impedance of a longer wire length.

How does a Line Driver actually works? – Electrical Engineering Stack Exchange

The increased current is able to overcome the capacitance caused by having many devices on a bus. Link to AM26LS31 datasheet: You can think of it as the logic gate equivalent of an amplifier. I think that in order to reduce 7h4c244 current that the FPGA suplies to the servo, I need to put the in between them, thus reducing the “effort” from the Altera. Tristate mode also saves power by not driving the line when there is nothing to send. The first is to provide a power gain.

What do you think a buffer is? Low-power Schottky circuitry reduces power consumption without sacrificing speed. The datasheet also states: The line driver also serves to isolate the datashheet circuits from electrostatic discharge from connections that might go off the board. I mean, it gives us the temperatures, but not how the actual component works That power is used by each buffer element to increase the load it can drive.


By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. This means that it can set the line “high”, “low”, or can effectively disconnect itself from the line.

Eminem – What makes you think the input is connected directly to the output? Anyways, if you look around a bit, you can find some slightly better datasheets that have more detailed internal diagrams.

74HC244 Datasheet PDF

Sign up or log in Sign up using Google. 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.

That datasheet gives everything you need to actually use a 74HC 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. It should be noted that the device identified above is a “tri-state” driver.

Jeff Bell 1 4. There are two principal functions of this line driver.


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It sounds like you’re looking for a equivalent circuit. So I’ve searched for days for information about the 74HC line driver.

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How does a line driver actually work? Any way, there is very little information about Line Drivers in general.

74HC Datasheet PDF –

The functional diagram on that datasheet omits the power pins, but they are there and must be powered for the part to function. Home Questions Tags Users Unanswered.

As always, the Datasheet provides raw and not very good information about the actual component: 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. A line driver is 74ch244 a buffer. What you put in one end comes out the other.

So, how do thy actually works? It can be used, eg, for a “bi-directional” bus between processor and memory or between processor and devices: Sign up using Email and Password. Email Required, but never shown.