15 Oct
2007
15 Oct
'07
11:46 p.m.
On 10/14/07, Tony Duell <ard at p850ug1.demon.co.uk> wrote:
The only 8-pin TTL chips I (just) rememebr the 7456
ands 7457 (I think)
which were /50 and /60 counters (desigend to get 1Hz clocks from European
or US power lines)
A darned useful set of through-hole TTL DIPs to have around are the
Fairchild 74OL6000 series. Basically opto-isolated level
translators in a 6 pin DIP. LSTTL in and (depending on part) TTL or
CMOS out, inverting or noninverting.
Pretty fast for optos too--about 70 nsec. propogation delay.
Still made, the last I checked.
Cheers,
Chuck