Adding analog, EPROM and EEPROM modules to CMOS logic technology: how modular?

The issue of modularity (design, process, manufacturing, reliability) in the addition of analog (resistor and capacitor), EPROM (electrically programmable ROM) (12.5-V isolation and cell), and EEPROM (electrically erasable programmable ROM) (18-V isolation, 18-V transistor and cell) modules to core CMOS technologies is discussed. Design modularity permits the design of complex circuits using standard cell logic libraries, process modularity simplifies the task of creating and executing the process flow, manufacturing modularity defines the incremental equipment requirements, and reliability modularity eliminates the need to requalify the core process. Three specific examples are described, including an 18-V EEPROM module for a 1.6- mu m CMOS core for an 8-b microcontroller with EPROM and EEPROM; a 5-V analog module for a 1.0- mu m CMOS core for a 10-b switched-capacitor, analog-to-digital converter (ADC); and a 10-V EEPROM module for a 0.8- mu m CMOS core for a EPROM programmable array logic device.<>