DS1673S-3+

Real Time Clock Overview

The DS1673S-3+ is a portable system controller integrating a real-time clock (RTC), nonvolatile RAM controller, microprocessor monitor, and a 3-channel 8-bit analog-to-digital converter (ADC). It operates on a +3.0V supply with a range of 2.7V to 3.3V and functions within a 0°C to +70°C temperature range. The device utilizes a simple 3-wire serial interface for communication. Key features include leap year compensation valid until 2100, automatic battery backup switching via the VCCO pin, and watchdog timer functionality. It is housed in a 20-pin SO package.

Real Time Clock Feature Summary

• Integrates RTC with alarm interrupt, NV SRAM controller, microprocessor monitor, and 3-channel 8-bit ADC
• Supports +3.0V operation (2.7V–3.3V) with automatic switchover to VBAT during power failure
• Features a 3-wire serial interface (CS, SCLK, I/O) for register access
• Includes watchdog timer with selectable delays (250ms, 500ms, 1000ms) and pushbutton reset control

Real Time Clock Applications

• Low-power portable products requiring integrated timekeeping and memory management
• System controllers for microprocessor-based embedded applications
• Battery-operated devices needing automatic backup switching and write protection

Real Time Clock Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status as indicated by the '+' suffix. Check current availability status, as this specific part number may be subject to discontinuation or limited stock conditions depending on the supplier region.

Real Time Clock Selection Notes

Select the DS1673S-3+ when a 3.0V supply voltage is required; the DS1673E-5 variant supports 5.0V. Ensure the application requires the SO-20 package format rather than TSSOP. Verify that the external SRAM interface requirements align with the CEOL/CEOH chip-enable outputs and that the 3-wire interface is compatible with the host microcontroller.

Real Time Clock Part Context

The DS1673S-3+ belongs to the DS1673 family of portable system controllers manufactured by Analog Devices / Maxim Integrated. The 'S' designation indicates the SO-20 package, while the '-3' suffix specifies the +3.0V operating voltage version. This component consolidates multiple system management functions into a single chip to reduce board space and complexity in portable designs.

Real Time Clock Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.