SN74HC365: Sn74HC365 - Increasing output current drive

ANDREW JAMES

Part Number: SN74HC365

In my application I would like to drive regularly drive 7.5mA from the output from these hex-lin-drivers with the possiblity in an unlikely fault condition they would have to drive 12mA for about 500mS max.

The data sheet mentions a +/-6mA output drive, then quotes "Io" as +/-35mA and I'm not sure what the difference is.

If 6mA is the true limit, I am considering 'pairing up' multiple channels in parrallel to double their output drive capability:

Would this be a valid workaround?

Thanks

4 months ago

0 Clemens Ladisch 4 months ago

Guru 322010 points

WIth up to 6 mA, the electrical characteristics are guaranteed.

With up to 36 mA, the device will not be damaged, but the output voltage is not guaranteed. (With a fault, you probably do not care about that.)

0 ANDREW JAMES 4 months ago in reply to Clemens Ladisch

Prodigy 50 points

OK thanks for the explanation.

If I wanted to guarantee the output voltage is still maintained with 7.5mA current draw under non-fault conditions, would "pairing" channels double that 6mA limit to about 12mA ?

+1 Malcolm Lyn 4 months ago in reply to ANDREW JAMES

TI__Mastermind 31950 points

Hi Andrew,

Yes, shorting together the outputs and their respective inputs allows you to effectively double the drive strength.

Best,

Malcolm

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SN74HC365: Sn74HC365 - Increasing output current drive