Answers Database

XC4000XL: 1996 DATA BOOK: Page 4-24 table 10.Supported Source for XC4000-Series Device Inputs is incorrect


Record #1575

Product Family:  Hardware

Product Line:  4000EX

Problem Title:
XC4000XL: 1996 DATA BOOK: Page 4-24 table 10.Supported Source for
XC4000-Series Device Inputs is incorrect



Problem 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 CM
OS device(specificly 4000XL), it will require Vtt pin to 5V.


Solution 1:

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.



End of Record #1575