The 74HCU04 is a hex unbuffered inverter. Inputs include clamp 74HCU Hex unbuffered inverter. Rev. 7 — 8 December Product data sheet. Table 1 . Symbol. Parameter. Value. Unit. VCC. Supply Voltage. to +7. V. VI. DC Input Voltage. to VCC + V. VO. DC Output Voltage. to VCC + V. IIK. 74HCU Hex Unbuffered Inverter. High−Performance Silicon−Gate CMOS. The 74HCU04 is dimensions section on page 2 of this data sheet. ORDERING.
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74HCU04 Datasheet PDF –
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One of the datasheets has some transfer characteristics I am not sure I understand. Cause thats the maximum output current, surely adding a FB resistor to bias the device into this analog region is pushing the mosfets to the limit before you even start to drag some current out of it??
Am I reading this data correctly? It would mean you can only use 2 devices in analog mode at 6v before exceeding the package limits of 50mA for Vcc and ground. I think I am missing the point somehow. That’s how I read it, too.
But then, they weren’t designed to be used as analogue devices Well except they xatasheet common as muck as analog devices: I mean Fig 13 in the datasheet is a Linear Amplifier, I actually bought these unbuffered devices because they are the recommended version for analog purposes from an app note I was looking at. However, I have no intention of running it at 6v, was just a good example of nasty totem pole current, I guess 3. Yes, you are reading it correctly.
74HCU04 Datasheet(PDF) – ON Semiconductor
It’s intended to be a digital logic gate, not a linear amplifier. It’s designed to drive high-impedance loads at low currents. You wouldn’t “drag current out of it” in any typical application.
But then dataxheet are not using it for a dayasheet application, so do whatever you want, it’s a cheap chip if you burn it up. I’ve seen them used as final amps for super low power ham radio transmitters. Yeh, i dont care about blowing it up, just getting a good handle on what I am dealing with before designing a rig for it. Its a building block, it can be used analog if you want: I cant seem to datzsheet the totem pole current for the 74HC04 but I expect it is much the same and the ‘HCU04 anyway, if not more as it has 2 stages.
Still, if I avoid sitting it on that exact centre bias point it should be fairly happy, add a 10M pulldown or something and will be using probably 3. By dragging current out of it, I was talking uA or mA btw, its not a power device, certainly not going to heatsink a 74hc chip, thats cray cray: Be sure to read Fairchild’s application note AN too. Yep, a better choice in hindsight, I was looking for a low voltage device though, probably off a lithium and the hcu04 should have a better transfer characteristic at v, also low current was the plan lol.
Can’t find it listed anywhere yet. I assume given the higher minimum Vcc they run a higher gate threshold voltage and less Id when Vgs is 0.
As for the pins, the TI datasheet mentions they were designed as a pin compatible replacement.
Hex Unbuffered Inverter
Borrow a 5V power supply and a multimeter from a friend and measure the actual supply current of your actual chips. It’s a DC measurement and daatasheet the gate is unbuffered, there’s no possibility of oscillation.
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One is less error prone than the other.