Hello,
Is there any reason that you can't use a 74HC374 device? This can operate from a 3 volt supply, and so would be compatible with the MC1321x device.
An alternative approach to providing input or output expansion would be to use shift register devices, and to bit bang the SPI communications. For input expansion, a suitable device might be the 74HC589 or 74HC597. Multiple devices may be cascaded.
Regards,
Mac
Message Edited by bigmac on
2008-10-14 03:31 AM