FreeLists / si-list / [SI-LIST] Re: Fan-out in TTL and CMOS

[Fred Townsend <fred@xxxxxxxxxxxxx>]

TTL fan out is determined by load factors which is another way of saying 
DC load current. On the other hand CMOS does not have a significant DC 
current but is limited by the AC current which is another way of saying 
capacitive loading. Capacitve loading is made up of both the CMOS loads 
and the circuitry. These same factors effect time delay which may or may 
not be a factor depending timing margins. Noise may be a factor again 
depending on circuitry. Other factors such as jitter and clocking may 
considerations too.  In short, there is no single factor like TTL you 
can hang your hat on.

Fred Townsend

Ummalaneni, Venu Babu (Venu) wrote:

>Hi Experts,
>
>I know that fan-out in TTL circuits is decided by noise margin, i.e.; if
>we want more fan-out noise margin has to diminishes.
>
>In case of CMOS which factor decides the fan-out. As there is no static
>current drawn by the load, I hope time delay will decide the fan-out in
>case of CMOS.
>
>Please clear me if I am wrong. Any inputs are welcome.
>
>
>Thanks in advance
>
>Best Regards,
>Venu.
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