DS1673E-3+

Real Time Clock Overview

The DS1673E-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 at +3.0V with a serial 3-wire interface. The RTC provides timekeeping with leap year compensation up to 2100 and supports system power-on via alarm interrupts. The device manages external SRAM backup through VCCO, CEOL, and CEOH pins, ensuring data retention during power failures. It includes watchdog timer functionality and pushbutton reset control for system stability.

Real Time Clock Feature Summary

• Integrates RTC, NV SRAM controller, microprocessor monitor, and 3-channel 8-bit ADC
• Supports automatic battery backup and write protection for external SRAM via VCCO/CEOL/CEOH
• Features watchdog timer with selectable timeouts (250ms, 500ms, 1000ms) and pushbutton reset
• Uses simple 3-wire serial interface (CS, SCLK, I/O) for communication

Real Time Clock Applications

• Low-power portable products requiring integrated timing and memory management
• Systems utilizing Intel 80186 or 386EX microprocessors
• Applications needing wake-up capabilities from power-down states via RTC alarms

Real Time Clock Procurement Notes

Verify the specific voltage suffix (+3 vs +5) and package type (TSSOP vs SO) against design requirements. Confirm lead-free status indicated by the '+' suffix. Check for RoHS compliance documentation as required by local regulations. Ensure the operating temperature range of 0°C to +70°C matches the application environment.

Real Time Clock Selection Notes

Select the DS1673E-3+ for +3.0V logic systems; use DS1673E-5+ for +5.0V systems. The TSSOP package is suitable for surface mount applications. Consider the ADC channel count if analog monitoring is needed. Verify that the external SRAM interface requirements align with the CEI, BHE, and BLE pin configurations for byte or word-wide transfers.

Real Time Clock Part Context

The DS1673E-3+ belongs to the DS1673 family of portable system controllers from Analog Devices / Maxim Integrated. It is designed to consolidate multiple system functions into a single chip, reducing component count in portable designs. The 'E' indicates an extended temperature range variant within the broader product line.

Real Time Clock Replacement Considerations

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