ICM7170AIDG

Real Time Clock Overview

The ICM7170AIDG is a microprocessor-compatible real-time clock (RTC) manufactured by Intersil Corporation and distributed by Rochester Electronics. Fabricated using silicon gate CMOS LSI process, it features an 8-bit bidirectional bus for data input/output. The device includes eight internally addressable programmable counters ranging from 1/100 seconds to years, controlled by a crystal oscillator with selectable frequencies via an on-chip command register. It incorporates an on-chip regulated power supply for stable oscillator frequency and low power consumption. Key specifications include software-selectable 12/24 hour formats, latched time data to prevent roll-over during reads, full calendar functionality with automatic leap year correction, and an on-chip battery backup switchover circuit.

Real Time Clock Feature Summary

• Microprocessor bus compatible with 8-bit bidirectional data I/O and multiplexed or direct addressing
• Full calendar with automatic leap year correction and time range from 1/100 seconds to 99 years
• On-chip regulated oscillator supply ensuring frequency stability and low standby power operation
• Integrated alarm comparator, RAM, and interrupt capabilities from alarm and six selectable periodic intervals

Real Time Clock Applications

• Portable and personal computers
• Data logging systems
• Industrial control systems
• Point of sale terminals

Real Time Clock Part Context

The ICM7170 series is part of Intersil's legacy real-time clock portfolio, designed for microprocessor-based systems requiring precise timekeeping. Distributed by Rochester Electronics, this component serves as a replacement for obsolete inventory in existing designs. The 'A' suffix typically denotes specific temperature or performance grades within the family, while 'IDG' indicates the plastic DIP package variant suitable for through-hole mounting.

Real Time Clock Replacement Considerations

When replacing the ICM7170AIDG, verify pin compatibility with standard 24-pin DIP packages. Ensure the substitute RTC supports the required 8-bit bus interface and voltage levels. Check if the alternative device offers similar battery backup switchover mechanisms and calendar correction features to maintain system integrity without firmware modifications.