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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The increased current is able to overcome the capacitance caused by having many devices on a bus.

The line driver also serves to isolate the local circuits from electrostatic discharge from connections that might go off the board. 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 74c244 “effort” from the Altera. Email Required, but never shown. By clicking “Post Your Answer”, you acknowledge that you datashdet read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

In case it’s the apparent lack of power to the chip that’s confusing you: So I’ve searched for days for information about the 74HC line driver. That datasheet gives everything you need to actually use a 74HC It should be noted that the device identified above is a “tri-state” driver.

How does a line driver actually work? Eminem – What makes you think the input is connected directly to the output? Sign up or log in Sign up using Google.

Eminem Language barrier here, I think. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.


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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Jeff Bell 1 4. Low-power Schottky circuitry reduces power consumption without sacrificing speed.

Data Sheets: 74HCREV0

The datasheet also states: Sign up using Facebook. How does a Line Driver actually works?

What do you think a buffer is? What you put in one end comes out the other.

Home Questions Tags Users Unanswered. The first is to provide a power datashdet. All I see in the inner structure dataasheet enables and input to outpuut wires. There are two principal functions of this line driver. 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.

And how the can act as a line driver? So, how do thy actually works? Or the Altera can provide a good current flow to the servo without damaging it’s abilities? A line driver is simply a buffer. The enable function is common to all four drivers and offers the choice of an active-high or active-low enable G, G input. As always, the Datasheet provides raw and not very good information about the actual component: I mean, how the can increase the current with just sending the input to the output?

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. But how it works?

74HC Datasheet(PDF) – Motorola, Inc

Link to AM26LS31 datasheet: Hot Licks 3 8. Sign up using Email and Password.


Tristate mode also saves power by not driving the line when there is nothing to send. If you want more detail, you should start reading about how transistors work, and how they’re used 74hc24 make the logic gates in the shown diagram. The circuits that are driving the inputs may not have the power to drive the impedance of a longer wire length. It’s as if the chip were disconnected from the wire.


Any way, there is very little information about Line Drivers in general. I’m not sure what you mean by “how it works”. Post as a guest Name. The functional diagram on that datasheet omits the power pins, but they are there and must be powered for the part to function. This is used in situations where any of several components can “drive” the bus though hopefully not more than one at a time.

74HC244 Datasheet PDF

It sounds like you’re looking for a equivalent circuit. That power is used by each buffer datwsheet to increase the load it can drive. It can be used, eg, for a “bi-directional” bus between processor and memory datashwet between processor and devices: You can think of it as the logic gate equivalent of an amplifier.

Anyways, if you look around a bit, you can find some slightly better datasheets that have more detailed internal diagrams.

This means that it can set the line “high”, “low”, or can effectively disconnect itself from the line. I mean, it gives us the temperatures, but not how the actual component works