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SN74HCT373: Ideal Latch for asynchronous data access, SN74HCT373 vs SN74HCT573

Part Number: SN74HCT373
Other Parts Discussed in Thread: SN74HCT573

Hi -

I am reading data asynchronously from an ADC via a D-Latch as a buffer. The ADC interrupt is used to control the Latch state.

I need a latch that prevents invalid data being available even during the latch transition state (transparent Latch goes from disabled to enabled), So I need all Dn's to update simultaneously.

For the HTC type the logic guide says:

"Balanced propagation delay and transition times"

I assume this means Douts are updated simultaneously, which is what I want.

For the SN74HCT373, the data sheet says:

"Full Parallel Access for Loading"

Which I assume this also means Douts are updated simultaneously, same as above.

However,

The SN74HCT573  data sheet does NOT say:

"Full Parallel Access for Loading"

Basically my question is can I use the SN74HCT573 Latch instead of the SN74HCT373. Are they functionally interchangeable and well suited for balanced Dout loading?

Thank You

Tony.

  • Hi Tony,

    Functionally, these devices are interchangeable and will both work in your application. Their output skews are very minimal and is similar for both devices. The HCT573 you will see from the device pin out that the inputs are inline with the outputs which makes this device easier to layout in some instances.