CD4070B: VOL and VOH, TTL of LM566

Mirthunraju M

Part Number: CD4070B

Hi,

The VCO LM566 provide the TTL square wave output,

IC	VOH (V)	VOL (V)
LM566	14.27	6.41

Which is provided to CD4070 and CD4013's CLK,

IC	VIH (V)	VIL (V)
CD4013BE	11	4
CD4070BE	11	4

whereas, the VIL is exceeding the range, but still the expected output is observed.

We need to Understand, how it is possible?

Regards,

Mirthunraju M

6 months ago

0 Malcolm Lyn 6 months ago

TI__Genius 14520 points

Hi Mirthunraju,

Switching usually takes somewhere right around 50% VCC +/- a couple of hundred mV depending on process variations. However, we only guarantee switching performance within the range specified by VIL/VIH.

So, the design could work if you are operating between VIL/VIH, however, you do so at your own risk.

Best,

Malcolm

0 Mirthunraju M 6 months ago in reply to Malcolm Lyn

Prodigy 220 points

Hi Malcolm,

Yeah, I understood.

The VIH and VOH of VCO LM566 is practically tested value, and the exact value are not provided in datasheet.

Could you please provide?

Regards,

Mirthunraju M

0 Malcolm Lyn 6 months ago in reply to Mirthunraju M

TI__Genius 14520 points

We do not have an exact value. As I said, the value changes with process variations. We only characterize devices based off of VIH and VIL.

Best,

Malcolm

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CD4070B: VOL and VOH, TTL of LM566