Part Number: CD74HC221
Hi Experts,
Seeking your assistance on this query from customer named Sam:
In the datasheet for the CD74HC221, it says that "The calculation for the pulse width is tW = 0.7 RXCX at VCC = 4.5V ." However, when we measured the…
Part Number: CD74HC221 Other Parts Discussed in Thread: SN74LV221A
Hello,
I would like you to confirm that CD74HC221 will receive damage or there is no problem for reliablity in following case.
-- * User input following signal to 9 pin("2An"). …
Part Number: CD74HC221 Hi, currently I am designing a circuit including part:74HC221. However I can not find pspice model for that part.
And idea on how I can find that pspice model ? Or any similar spice models which can function as same as 74hc221…
Part Number: CD74HC221 Other Parts Discussed in Thread: SN74LS221 We are using CD74HC221 monostable multivibrator for our one of the project. We are using external capacitor (10uF) and resistors (100K) for 800mS pulse width calculated as per formula provided…
Mr. Maier,
Thank you very much for your quick reply. I am aware of some of the problems that SPICE simulators
have had with digital circuits. But, I did not know of the larger issues involved. Thank you again for
your help. James Suttles
Part Number: SN74LV221A 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…
Hi John and welcome to the forums!
I can't give details regarding internal projects, however I can say that we are definitely looking into the issue.
The LV221 is the only device that's shown this problem. I would recommend to instead use the HC…
Hi Karan, I am a little confused from your reply - specifically this part - Varying the input voltage doesn't change the output voltage. Varying Vcc will change the output voltage.
Vcc is technically the input voltage, right? I am still pulsing 5V from…
Hi Bing,
Not all datasheets have the "Submit Documentation Feedback" link on them (see the CD74HC221 as an example). The generic link is www.go-dsp.com/.../doc_feedback.htm but you will need to provide all the details especially the "Literature Number…
