"Subject: *TRISTATED GATES"
Why not use some tristated gates?
74(x)125, 74(x)126.
Three-State Outputs
Separate Output Enable Inputs
" The HC126 and HCT126 contain four independent threestate buffers,
each having its own output enable input,
which when LOW puts the output in the high-impedance state. "
" The HC125 and HCT125 contain 4 independent three-state buffers,
each having its own output enable input, which when HIGH puts the output in the high
impedance state. "
With a bit of imagination you can turn a gate or two in to an inverter to form a SPDT
switch...
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Author: Bob Paddock
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Fat City Network Services -- 858-538-5051 http://www.fatcity.com
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