Rochester Electronics MD82C54/B

The 82C54 is a programmable interval timer/counter designed for use with microcomputer systems. It is a general purpose, multi-timing element that can be treated as an array of I/O ports in the system software. The 82C54 solves one of the most common problems in any microcomputer system, the generation of accurate time delays under software control. Instead of setting up timing loops in software, the programmer configures the 82C54 to match his requirements and programs one of the counters for the desired delay. After the desired delay, the 82C54 will interrupt the CPU. Software overhead is minimal and variable length delays can easily be accommodated. Some of the other computer/timer functions common to microcomputers which can be implemented with the 82C54 are: • Real time clock • Event counter • Digital one-shot • Programmable rate generator • Square wave generator • Binary rate multiplier • Complex waveform generator • Complex motor controller

• 8MHz to 12MHz Clock Input Frequency
• Compatible with NMOS 8254 - Enhanced Version of NMOS 8253
• Three Independent 16-Bit Counters
• Six Programmable Counter Modes
• Status Read Back Command
• Binary or BCD Counting
• Fully TTL Compatible
• Single 5V Power Supply
• Low Power - ICCSB... 10μA - ICCOP... 10mA at 8MHz
• Operating Temperature Ranges - CX82C54... 0°C to +70°C - IX82C54... -40°C to +85°C - MD82C54... -55°C to +125°C
• Pb-Free Plus Anneal Available (RoHS Compliant)