Interfacing TTL and CMOS logic

[jbv]

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.
Of course, direct interfacing is impossible, especially because the
'positive' level of the TTL
output (typically 3.5V) is not sufficient for the CMOS. So I need to put
some buffer in between.

I found out that the 4049 (sextuple buffer) converts signals up to +15V
into +5V TTL regular
signals. So I imagine that there must be some equivalent buffer to
convert 0/5V TTL signals
into 0/+15V CMOS signals. And I don't have any CMOS databook at hand
(everywhere I ask, it
seems to be unavailable or sold out...)

Important : I have very little room left on my PCB, and that's why I'm
looking for a one-chip
solution (no extra resistors, etc.).

I also read somewhere that pull-up resistors connected between the TTL
outputs and the VCC
would be a workable solution... But to which VCC : +5V for TTL ics, or
+15V for CMOS  ics ?

Any suggestion ?

jbv