comp.arch.embedded cmos fet driver
The cd4041ub looks good for driving an fet with about 2500 pf at the input. In the test circuit, the 4041 is driven by an optical isolator's output with rise & fall times in the neighborhood of 5 micro sec's. In this setup, the 4041 noninverting output drives 2500 pf in about 1/4 of a microsecond, rising & falling - well within limits. However, the inverting output isn't so fast. It shows an initial ramping for a volt or two before geting to expected rise & fall rates. What's needed, in order to use the inverting output, is a noninverting amplifier before the 4041ub. Or, hopefully, an equivelent to a 4041b, without the U for unbuffered. Maybe a buffered inverting "hex" driver I haven't seen with similar output specs to the 4041? Anyone know of such a device? Hul