ICM7170IBG

The ICM7170 real time clock is a microprocessor bus compatible peripheral, fabricated using Intersil’s silicon gate CMOS LSl process. An 8-bit bidirectional bus is used for the data I/O circuitry. The clock is set or read by accessing the 8 internal separately addressable and programmable counters from 1/100 seconds to years. The counters are controlled by a pulse train divided down from a crystal oscillator circuit, and the frequency of the crystal is selectable with the on-chip command register. An extremely stable oscillator frequency is achieved through the use of an on-chip regulated power supply.Features• 8-Bit, µP Bus Compatible - Multiplexed or Direct Addressing• Regulated Oscillator Supply Ensures Frequency Stability and Low Power• Time From 1/100 Seconds to 99 Years• Software Selectable 12/24 Hour Format• Latched Time Data Ensures No Roll Over During Read• Full Calendar with Automatic Leap Year Correction• On-Chip Battery Backup Switchover Circuit• Access Time Less than 300ns• 4 Programmable Crystal Oscillator Frequencies Over Industrial Temperature Range• 3 Programmable Crystal Oscillator Frequencies Over Military Temperature Range• On-Chip Alarm Comparator and RAM• Interrupts from Alarm and 6 Selectable Periodic Intervals• Standby Micro-Power Operation: 1.2µA Typical at 3.0V and 32kHz CrystalApplications• Portable and Personal Computers• Data Logging• Industrial Control Systems• Point Of Sale

Key Features

• The ICM7170IBG features include programmable counters for time and calendar information
• small outline plastic packages (SOIC)
• and 51 bits of Alarm Compare RAM for storing time data

Application

• The applications of ICM7170IBG include portable and personal computers
• data logging
• industrial control systems
• and point of sale systems