ODP: Interfacing TTL and CMOS logic

[Roman Sowa]

How about a resistor network for each pin:
10k from +15 to CMOS input
6k8 from 8051 output to CMOS input

ar another way - 5V1 zener in place of 6k8 resistor

Roman

PS I've never seen more zeners than in my designs

> -----Oryginalna wiadomość-----
> Od:	jbv [SMTP:jbv.silences at wanadoo.fr]
> Wysłano:	11 marca 1999 23:25
> Do:	synth-diy at mailhost.bpa.nl
> Temat:	Interfacing TTL and CMOS logic
> 
> Hi there,
> 
> I'm back to this list with a slightly off-topic question.
> 
> I need to drive a logic CMOS IC from a TTL source (actually a port of a
> 8051).
> The power supply of the TTL source is +5V, while the CMOS IC is +15V.
> 
> jbv