SN74LVC1G80-Q1: Output issue and connection check

Zirui Su

Part Number: SN74LVC1G80-Q1

Hi team

My customer is externally connect a SN74LVC1G80-Q1 but there is no output at the device output (Q) side, could you please kindly help to check whether their connection is correct? Thank you (The red marked part is the external SN74LVC1G80Q1)

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 316690 points

What do you mean with "no output"? Does pin 4 have the wrong voltage, or is there no voltage at all? Does the output change when there is a rising clock edge?

The P6.5 output, if active, will override the /Q output. Can you show oscilloscope traces of pins 1, 2, and 4?

0 Zirui Su over 3 years ago in reply to Clemens Ladisch

TI__Expert 5340 points

Hi Ladisch,

I will ask customer to test the pin 1/2/4 waveform. By the way, I discuss with customer that their /Q has no voltage at all, do you mean if the P6.5 output if keep always high, the /Q output will also be high?

0 Clemens Ladisch over 3 years ago in reply to Zirui Su

Guru 316690 points

Without the connection to P6.5, the output would toggle at every rising edge of CLK. But when P6.5 outputs a fixed value, the output will never change.

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SN74LVC1G80-Q1: Output issue and connection check