DS1670S+

Real Time Clock Overview

The DS1670S+ 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 3.3V supply with a range of 2.97V to 3.63V. The RTC provides timekeeping in BCD format with leap year compensation up to the year 2100 and supports 12/24-hour modes. Communication utilizes a simple 3-wire serial interface. The device includes automatic battery backup switching via the VCCO pin when VCC drops below 2.7V, ensuring data retention for external SRAM.

Real Time Clock Feature Summary

• Integrates RTC with alarm interrupt, NV RAM controller, watchdog timer, and 3-channel 8-bit ADC
• Supports 3-wire serial interface for low-pin-count communication
• Provides automatic write protection and power switchover for external SRAM via CEOL/CEOH pins
• Includes microprocessor monitor with pushbutton reset and watchdog timer functionality

Real Time Clock Applications

• Portable system controllers requiring timekeeping and memory management
• Battery-powered embedded systems needing low-power standby modes
• Microprocessor-based designs requiring hardware watchdog and reset monitoring

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 production status, as discontinuation notices may affect long-term availability. Ensure ordering specifications match the required 20-SOIC package variant.

Real Time Clock Selection Notes

Select this component for applications requiring integrated RTC and SRAM control in a single package. Ensure the design accommodates the 3.3V operating voltage and 0°C to +70°C temperature range. Verify that the external crystal load capacitance matches the recommended 6pF for accurate timing. Confirm compatibility with the 3-wire interface protocol for system integration.

Real Time Clock Part Context

The DS1670S+ belongs to the DS1670 family of portable system controllers manufactured by Analog Devices Inc./Maxim Integrated. It shares functional characteristics with variants like the DS1670E+, differing primarily in package type (SO vs. TSSOP) and top marking. The series is designed for low-power portable electronics, combining timekeeping, memory control, and analog conversion capabilities.

Real Time Clock Replacement Considerations

DS1670E+ serves as a direct functional substitute with identical electrical specifications, differing only in the 20-TSSOP package instead of 20-SOIC. Verify pinout compatibility and physical footprint constraints before substitution.