MCS® 251 Microcontroller LineCard Each product listed below has the high performance MCS251 architecture, PCA, and H/W WDT Product: 87C251SA ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 8K 1K 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 87C251SB ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 16K 1K 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 87C251SP ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 8K 512 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 87C251SQ ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 16K 512 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 83C251SA (87C251SA, ROM) ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 16K 512 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 83C251SB (87C251SB, ROM) ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 16K 1K 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 83C251SP (87C251SP, ROM) ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 8K 512 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 83C251SQ (87C251SQ, ROM) ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp 16K 512 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 80C251SB ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp ROMless 1K 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Product: 80C251SQ ROM/ EPROM (Bytes) Register RAM (Bytes) Timer/ Counters Serial Port Analog Input Channels I/O Pins Speed (MHz) Process / Package Security Temp ROMless 512 3 1 0 32 16 CHMOS / P,N,TN,TP L3 C,E Nomenclature: P = 40 Lead Plastic Dual Inline Package at commercial temp N = 44 Lead Plastic Lead Chip Carrier at commercial temp TN = 44 Lead Plastic Lead Chip Carrier at express temp TP = 40 Lead Plastic Dual Inline Package at express temp C = Commercial Temperature E = Express Temperature 87CX51,ROM = Factory Program ROM

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