Consider the age of this piece of gear. ?If it uses
old-style (4000
series) CMOS for other things, the use of a 10 volt Vdd/Vcc has
advantages--increased speed and noise immunitity being the chiefest.
Would this piece of equipment be too new to use HTL?
I understand this is a piece of RCA video equipment from the late
1970s, with custom LSI. Perhaps it was designed by one of the guys
that was pushing higher voltage CMOS designs of the era.
--
Will