ICM7170IPG

Product Summary

The ICM7170IPG real time clock is a microprocessor bus compatible peripheral, fabricated using Intersils silicon gate CMOS LSl process. An 8-bit bidirectional bus is used for the data I/O circuitry. The clock ICM7170IPG is set or read by accessing the 8 internal separately addressable and programmable counters from 1/100 seconds to years. The counter is controlled by a pulse train divided down from a crystal oscillator circuit, and the frequency of the crystal is selectable with the onchip command register. An extremely stable oscillator frequency of the ICM7170IPG is achieved through the use of an on-chip regulated power supply. The ICM7170IPG access time (tACC) of 300ns eliminates the need for wait states or software overhead with most microprocessors. Furthermore, an ALE (Address Latch Enable) input is provided for interfacing to microprocessors with a multiplexed address/data bus. With these two special features, the ICM7170IPG can be easily interfaced to any available microprocessor. It is intended for Portable and Personal Computers, Data Logging, Industrial Control Systems and Point Of Sale.

Parametrics

ICM7170IPG absolute maximum ratings: (1)Supply Voltage: +8.0V; (2)Power Dissipation: 500mW; (3)Storage Temperature Range: -65 to 150℃; (4)Lead Temperature (Soldering 10s): 300℃; (5)Input Voltage (Any Terminal): VDD +0.3V to VSS -0.3V.

Features

ICM7170IPG features: (1)8-Bit, uP Bus Compatible: Multiplexed or Direct Addressing; (2)Regulated Oscillator Supply Ensures Frequency Stability and Low Power; (3)Time From 1/100 Seconds to 99 Years; (4)Software Selectable 12/24 Hour Format; (5)Latched Time Data Ensures No Roll Over During Read; (6)Full Calendar with Automatic Leap Year Correction; (7)On-Chip Battery Backup Switchover Circuit; (8)Access Time Less than 300ns; (9)4 Programmable Crystal Oscillator Frequencies Over Industrial Temperature Range; (10)3 Programmable Crystal Oscillator Frequencies Over Military Temperature Range; (11)On-Chip Alarm Comparator and RAM; (12)Interrupts from Alarm and 6 Selectable Periodic Intervals; (13)Standby Micro-Power Operation: 1.2uA Typical at 3.0V and 32kHz Crystal.

Diagrams