6 Feb
2006
6 Feb
'06
11:33 a.m.
On 2/6/06, vrs <vrs at msn.com> wrote:
From: "9000 VAX" <vax9000 at
gmail.com>
REV.0 was not suppose to be used in a big system any way. 74HCT14 has
a lower load, but its voltage range is too big.
On the REV.0 board I used 74LS14 to receive
critical lines (DIN, DOUT,
RPLY...), and plain LSTTL for other non critical lines (DAL0-22, WTBT,
BS7...) and it worked OK too.
Ouch. I'd at least use the 74HCT14, to reduce the bus loading. That
way, the problems will show up with your device, rather than some
other :-).
But you still won't get much noise immunity from the 0.6V Vil.
Vince