Replacing the X1226, X1227, X1228 or X1288 RTC with the ISL12026, ISL12027, ISL12028 Replacing the X1226, X1227, X1228 or X1288 RTC with the ISL12026, ISL12027, ISL12028 Application Note April 13, 2007 AN1303.0 Intersil has recently introduced a new family of Real Time operation should be reviewed. See the ISL12027 data sheet Clock (RTC) devices (the “ISL1202x” family) which include for more details. 4k of EEPROM. These devices are pin for pin compatible There are only two changes that affect microcode or and include enhancements over an……