SN74HC595: SN74HC595

jim norder

Prodigy 10 points

Part Number: SN74HC595
Other Parts Discussed in Thread: SN74HCS595

I am trying to find out if the output pins have clamping protection to Vcc and ground.

over 3 years ago

0 Rami Mooti1 over 3 years ago

TI__Mastermind 23373 points

Hey Jim,

Here's a good FAQ on this :
[FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

In this case, the device does have the clamping diodes to VCC and Ground.

Thanks,
Rami

+1 jim norder over 3 years ago in reply to Rami Mooti1

Prodigy 10 points

I am looking for information on the output structure, such as clamping devices, of the output pins, not the input pins.

0 Rami Mooti1 over 3 years ago in reply to jim norder

TI__Mastermind 23373 points

Sorry about that, I highlighted the wrong thing. The answer remains the same for input and output

Thanks!
Rami

0 jim norder over 3 years ago in reply to Rami Mooti1

Prodigy 10 points

Rami,

Thanks for the feedback. I believe this confirms a clamping structure on the output pins. Some of the older datasheets used to include schematic representations of the input and output pin structures, but do not see that information in more recent datasheets. I wish that information was included in the datasheets.

Regards,

Jim

0 Emrys Maier over 3 years ago in reply to jim norder

TI__Guru* 96591 points

Hey Jim,

I agree that this is useful information and I don't particularly like that our datasheets stopped showing this information more clearly.

Our most recent datasheet format now includes the clamp diode information again.

The new HCS (SN74HCS595) logic family uses this format:

Logic

Logic forum

SN74HC595: SN74HC595