HT46C48A Datasheet, Holtek Semiconductor

* Operating voltage:
* Up to 0.5ms instruction cycle with 8MHz system clock fSYS=4MHz: 2.2V~5.5V fSYS=8MHz: 3.3V~5.5V
* 13 to 23 bidirectional I/O lines
.

that interface directly to analog signals, such as those from sensors. All devices include an integrated multi-channel A.