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The MM58146N is a real-time clock (RTC) integrated circuit manufactured by National Semiconductor (NS).

Specifications:

• Manufacturer: National Semiconductor (NS)
• Type: Real-Time Clock (RTC)
• Interface: Parallel
• Supply Voltage: 5V ±10%
• Operating Temperature Range: 0°C to +70°C
• Clock Frequency: 50Hz or 60Hz (selectable)
• Timekeeping Accuracy: Dependent on external crystal or power line frequency
• Package: 24-pin DIP (Dual In-line Package)
• Features:
• Counts seconds, minutes, hours, day of week, date, month, and year
• Leap year compensation
• 12-hour or 24-hour time format
• Power-fail detection and backup mode support
• Requires minimal external components

Descriptions:

The MM58146N is a CMOS real-time clock designed for timekeeping applications. It maintains time and calendar functions with minimal power consumption and can be driven by either an external crystal oscillator or the power line frequency (50Hz/60Hz).

Features:

• Timekeeping Functions:
• Seconds, minutes, hours
• Day of week, date, month, year
• Calendar Adjustments:
• Automatic leap year correction
• 28/29/30/31-day month handling
• Power Management:
• Battery backup capability
• Low-power CMOS technology
• Output Options:
• Parallel data interface
• Interrupt capability for alarms

This IC was commonly used in early computer systems, industrial controllers, and embedded applications requiring accurate timekeeping.