8-bit 8051 MCU, 4KB Flash, 20-Pin SSOP, 20MHz, 5V
8-bit 8051 MCU, 8KB Flash, 20-Pin SSOP, 20MHz
8-bit 8051 CISC MCU, 16KB Flash, 20-Pin SSOP, 5.5V
8-bit 8051 CISC MCU, 4KB Flash, 20-Pin SOP, 20MHz
8-bit 8051 CISC MCU, 4KB Flash, 20-Pin DIP