5270 compatible logic chips

[blondguy]

First off, I am a software guy who dabbles in hardware. That said, I have questions about what digital chip series are compatible with a 5270.

The planned external components are:
2 (R/W) quadrature encoders (3st - LVTTL)
2 (R) keypad encoders (5V TTL)
1 (R) 8 bit ADC (5v TTL)
1 (W) 4-16 decoder (*) (address decoding)
2 (R/W) 8 bit latches (*)
2 (R/W) multiplexed interrupt lines (*)

(*) I can make them whatever I need to.

So my question is what series of chips should(could) I use. I was planning on using 'LV' series for everything, with the exception of using 74LVC4245's to translate the 5V signals to 3.3V.

I just saw the external bus app note and it uses an 'HC' series chip. I thought that the HC series used cmos logic levels, which from what I understand are incompatible with LVTTL.

What are my options and what are the best choices?

TIA

[rnixon]

I though HC was only 5V, which would be bad, but when I looked at some newer data sheets the HC parts have a Vcc range of 2 to 7 VDC, so if you used 3.3V it should be ok. However, I would use a class of parts that is more commonly known for 3.3V logic to make things more obvious, like LVTTL. Or you could use LVX, which is 3.3V with 5V tolerant inputs.

[rnixon]

What did you decide to use?