Other Parts Discussed in Thread: SA556
Currently, I am using TI NA556 (DUAL PRECISION TIMERS).
I used to use SA556 (manufactured by STMicroelectronics), but it has been discontinued.
I am using NA556 as a replacement.
① I believe that the NA556 above has the same specifications as the SA556, is that correct?
This product generates the following pulses, but there are no formulas for t1 and t2 in the NA556 data sheet.
Are the formulas the same? (The following is the formula described in SA556)
f=1.44/((Ra+2Rb)*C)
② Currently, I think it's the same formula, and with the combination of resistors and capacitors,
The following resistors and capacitors are used to output frequencies of 10kHz and 100Hz.
10kHz: Ra, Rb=470Ω, C=0.1μF
100Hz: Ra, Rb=4700Ω, C=1μF
However, in reality
10kHz (expected value): 11.87kHz (at startup) to 14.21kHz (about 4 hours after startup)
100Hz (expected value): 145.8Hz (at startup) to 161.5Hz (about 4 hours after startup)
The expected value of the frequency is different, and the frequency becomes higher as time passes.
Is the combination of resistor and capacitor correct?
Also, I don't think this movement is correct, but is it correct to use it?
Thank you for your confirmation.
that's all.
