SN74HC245: Internal RC value

Roy Chou1

Genius 12565 points

Part Number: SN74HC245

Hi Team,

Do we have IC internal RC value can be information? Thank you.

Regards,

Roy

over 2 years ago

0 Emrys Maier over 2 years ago

TI__Guru* 96591 points

Hi Roy,

I'm afraid I don't understand - what resistor or capacitor values are you trying to determine?

0 Roy Chou1 over 2 years ago in reply to Emrys Maier

TI__Genius 12565 points

Hi Emrys,

Now, we are using B-> A direction. And we want to know below RC input. (red arrow)

Roy

0 Emrys Maier over 2 years ago in reply to Roy Chou1

TI__Guru* 96591 points

Hi Roy,

With B set as an input, we would expect the capacitance to be between 1 and 10pF, with the typical value being 3pF.

The leakage current is up to 5μA at 6V, so the worst case 'resistance' to VCC and ground can be modelled as 1.2MΩ. For typical performance, I would recommend to use 120MΩ.

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SN74HC245: Internal RC value