Features and Benefits
- Provides Real-Time Clock
- Counts Seconds, Minutes, Hours, Date of the
- Month, Month, Day of the Week, and Year
- with Leap Year Compensation Valid Up to 2100
- Power-Control Circuitry Supports System
- Power-On from Day/Time Alarm
- Microprocessor Monitor
- Halts Microprocessor During Power Fail
- Automatically Restarts Microprocessor after
- Power Failure
- Monitors Pushbutton for External Override
- Halts and Resets an Out-of-Control
- NV RAM Control
- Automatic Battery Backup and Write Protection
- to External SRAM
- 3-Channel, 8-Bit ADC
- Simple 3-Wire Interface
- +3.0V or +5.0V Operation
The DS1673 portable system controller is a circuit that incorporates many of the functions necessary for low-power portable products integrated into one chip. The device provides a real-time clock (RTC), NV RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter (ADC). Communication with the DS1673 is established through a simple 3-wire interface.
The RTC provides seconds, minutes, hours, day, date, month, and year information with leap year compensation. The RTC also provides an alarm interrupt. This interrupt works when the DS1673 is powered by the system power supply or when in battery-backup operation, so the alarm can be used to wake up a system that is powered down.
Automatic backup and write protection of an external SRAM is provided through the VCCO, active-low CEOL, and active-low CEOH pins. The backup energy source used to power the RTC is also used to retain RAM data in the absence of VCC through the VCCO pin. The chip-enable outputs to RAM (active-low CEOL and active-low CEOH) are controlled during power transients to prevent data corruption.
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
DS1673 Reliability Data1/12/2023
Oscillator Design Considerations for Low-Current Applications1/26/2011
Selecting a Backup Source for Real-Time Clocks5/26/2006
Using the DS32kHz with Maxim Real-Time Clocks2/15/2002
Design Considerations for Maxim Real-Time Clocks2/15/2002
Crystal Considerations with Maxim Real-Time Clocks (RTCs)3/29/2001
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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