SN74HCS596: Output state

Ryuuichi machida

Guru 11820 points

Part Number: SN74HCS596
Other Parts Discussed in Thread: SN74HCS595

Hello,

I would like to confirm about timing diagram of SN74HCS596.

Because, there is no data about output state which depend on state of each pins.

Could you please confirm and show it to me ?

BR,

over 3 years ago

0 Rami Mooti1 over 3 years ago

TI__Mastermind 28088 points

BR,

What exactly are you looking for? Timing characteristics and switching characteristics are quantified in the data sheet in sections 6.6 and 6.7. Waveforms are shown in figures in section 7.
with regards to output state depending on the state of each pin, this is also covered at the very in table 8-1:

Was there something specific you were uncertain about?

Thanks,
Rami

0 Ryuuichi machida over 3 years ago in reply to Rami Mooti1

Guru 11820 points

Hello,

What I want to get is below.

* Same information as Figure 6-1. Timing Diagram of SN74HCS595.

https://www.tij.co.jp/jp/lit/ds/symlink/sn74hcs595.pdf

BR,

0 Clemens Ladisch over 3 years ago in reply to Ryuuichi machida

Guru 280410 points

The '595 and '596 behave the same; the only difference is the open-drain outputs.

0 Ryuuichi machida over 3 years ago in reply to Clemens Ladisch

Guru 11820 points

Hello,

I wonder one thing about below.

>The '595 and '596 behave the same; the only difference is the open-drain outputs.

Even though 596 is open-drain output device, there is "VOH" specification in datasheet.

So, I do not know this device will output high level or not in fact. Therefore, I wanted to know exact timing diagram of 596.

Can you show actual figure of timing diagram for 596 ?

BR,

0 Clemens Ladisch over 3 years ago in reply to Ryuuichi machida

Guru 280410 points

V_OH is for the Q_H' output.

0 Ryuuichi machida over 3 years ago in reply to Clemens Ladisch

Guru 11820 points

Hello,

>V_OH is for the Q_H' output.

What I want to confirm is below.

* According to datasheet, Voh spec depends on Vcc. (Not external pull up voltage)

It seems that this means this device can drive high level. So, I want to confirm exact timing diagram for output(Qx).

Best Regards,

0 Rami Mooti1 over 3 years ago in reply to Ryuuichi machida

TI__Mastermind 28088 points

BR,

The 595 and 596 are the same except for that the 596 has open-drain outputs so you can use the 596 timing diagram. Not all the outputs are open drain in the 595 though. The Q_H' output is a serial push pull output. This is what the V_OH is referring to in the 595 datasheet. The other Q_A-Houtputs are open drain. They will not drive anything high. See section 8.3.2 of the datasheet :

Thanks,
Rami

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SN74HCS596: Output state