The HC11’s minimum high voltage level input voltage is VDD * 0.7 = 3.5V. Most SRAM’s and UART’s guarantee no less than 2.4 volts output as a logic high, but in some cases are still compatible as their outputs are above 3.5 volts anyway.
Does anyone have any thoughts, suggestions, or experience using a chip such as a 74HCT245, or the like, between the HC11 and the data bus as a level translator? I was thinking about using the R/W line for control.
Added p/n to subject.
Message Edited by NLFSJ on 2008-09-24 01:34 PM