SN74HCS595-Q1: Absolute maximum ratings of input terminals

? ??

Prodigy 40 points

Part Number: SN74HCS595-Q1

Tool/software:

Hello.

What is the maximum input voltage for input terminals such as SER and OE?

In the Input clamp current item, it says Vi>VCC+0.5V, but is the idea that VCC (Max) 7V+0.5V=7.5V correct?

11 months ago

0 Clemens Ladisch 11 months ago

Guru 317250 points

The limit always depends on the actual supply voltage.

In practice, the supply voltage will not be 7 V, so in practice, that 7.5 V value does not matter.

The recommended operating conditions do not allow voltages above V_CC. What is the actual problem you're trying to solve?

0 ? ?? 11 months ago in reply to Clemens Ladisch

Prodigy 40 points

Thank you for your reply.
What I want to know is the absolute maximum rating of the input terminal.
I would like to know the permissible value because the voltage at the input terminal can be higher than VCC.

+1 Clemens Ladisch 11 months ago in reply to ? ??

Guru 317250 points

There are clamping diodes to V_CC; see [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

When you limit the current to something near zero, the forward voltage will no more than 0.5 V (so V_CC + 0.5 V is always safe). But for larger currents up to 20 mA, the forward voltage will be higher.

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SN74HCS595-Q1: Absolute maximum ratings of input terminals