82C54 CMOS Programmable Interval Timer 8MHz to 12MHz Clock Input Frequency Compatible with NMOS 8254 - Enhanced Version of NMOS 8253 2.71 24 Ld CerDIP 24 Ld PDIP 28 Ld CLCC 28 Ld PLCC 28 Ld PLCC T+R 82C55A CMOS Programmable Peripheral Interface Pin Compatible with NMOS 8255A 24 Programmable I/O Pins Fully TTL Compatible High Speed 2.01 40 Ld CerDIP 40 Ld PDIP 44 Ld CLCC 44 Ld MQFP 44 Ld MQFP T+R 44 Ld PLCC 44 Ld PLCC T+R 82C59A CMOS Priority Interrupt Controller 12.5MHz, 8MHz and 5MHz Versions Available High Speed 28 Ld CerDIP 28 Ld CerDIP 28 Ld PDIP 28 Ld PLCC 28 Ld PLCC T+R 82C84A CMOS Clock Generator Driver Generates the System Clock For CMOS or NMOS Microprocessors Up to 25MHz Operation Uses a Parallel Mode Crystal Circuit or External Frequency Source Provides Ready Synchronization 2.06 18 Ld CerDIP 18 Ld PDIP 20 Ld PLCC 20 Ld PLCC T+R