AR# 1575: XC4000XL: 1996 DATA BOOK: Page 4-24 table 10.Supported Source for XC4000-Series Device Inputs is incorrect
AR# 1575
XC4000XL: 1996 DATA BOOK: Page 4-24 table 10.Supported Source for XC4000-Series Device Inputs is incorrect
Description
Keywords: 3.3V, 4000XL, DATA BOOK, VTT, 5V
Urgency: Standard
Description
In the table it shows that, in order to have a 5V CMOS device sourcing a 3.3V CMOS device(specificly 4000XL), it will require Vtt pin to 5V.
Solution
That is incorrect, the new design puts an internal protection circuitry that can stand 5V CMOS input to 3.3V XL parts. Therefore driving a 5V CMOS output into a 4000XL input (with CMOS inputs specified) is not be a problem.