The AT90LS2323-4PI from Microchip Technology is an AVR 90LS 8-bit microcontroller Integrated Circuit at 4 MHz with 2 KB (1K x 16) flash memory in an 8-PDIP package.
The AT90LS2323-4SC from Microchip Technology is an AVR® 90LS microcontroller Integrated Circuit with 8-bit architecture, 4 MHz, and 2KB (1K x 16) flash memory, in an 8-SOIC package.
The AT90LS2323-4SI from Microchip Technology is an 8-bit AVR 90LS microcontroller Integrated Circuit running at 4 MHz with 2 KB (1K x 16) flash memory, in an 8-SOIC package.
The AT90LS2323-4PC from Microchip Technology is an AVR 90LS 8-bit microcontroller Integrated Circuit rated at 4 MHz, with 2 KB (1K x 16) Flash memory in an 8-PDIP package.