Other Parts Discussed in Thread: CD74HCT221, CD74HC221
Tool/software:
Dear Texas Instruments Support Team,
I’m designing a trigger box for an MR scanner requiring reliable 5ms pulse stretching. I’ve noted issues with the SN74LV221A on E2E forums (e.g., pulse shortening/retriggering during capacitor discharge, threads: e2e.ti.com/support/logic/f/836072 and e2e.ti.com/support/logic/f/956110). My questions are:
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Have these issues been resolved in newer SN74LV221ASN74LV221A revisions?
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If not, do you recommend the CD74HCT221 for my 5V, 5ms pulse application (RC: ~71.5kΩ/100nF)?
Reliability is critical for medical use. I can provide further setup details if needed.
Thank you,