SN74LV373A-Q1: Truth table and output status confirmation

Ethan Liu

Part Number: SN74LV373A-Q1
Other Parts Discussed in Thread: SN74LV273A-Q1, SN74LV373A

Tool/software:

H team,

I found that the truth table of SN74LV373A-Q1 are inconsistent with the package pins. Can you help explain what the CLR/CLK represents?

Besides, I connected the devices through the following structures, however, the output is always high, I don't know the reason. We need to latch the output so that the reset of MCU will not influence the output.

Best regards!

Ethan

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 316780 points

The function table is wrong; it was accidentally copied from the SN74LV273A-Q1 datasheet. The SN74LV373A datasheet has the correct table.

The initial state of a latch is undefined (either high or low). To get this latch into a known state, you would have to initialize it by pulling LE high with the desired state at the D input.

What is the actual function that you need?

0 Ethan Liu over 1 year ago in reply to Clemens Ladisch

TI__Intellectual 1445 points

Hi Clemens,

Why I test the initial state of SN74LV373A-Q1 is always high? Does it have some mechanism to latch the output to high in initial state?

Ethan

0 Clemens Ladisch over 1 year ago in reply to Ethan Liu

Guru 316780 points

See [FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)?

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SN74LV373A-Q1: Truth table and output status confirmation