Do we have X4028EX or XC4036EX parts in -1 speed?
No, X4000EX parts are not available in -1 Speed grade. They are only available in -4,-3, and -2.
1998 Databook has error in page 4-148, Table 27.
The speed grade should read -4,-3,-2. (not -3,-2,-1)
Product manager is aware of this error, and request has been made to correct this.
Faster speed grades are available for the XC4028XL and XC4036XL devices.