DS1670S

Real Time Clock Overview

The DS1670S is a portable system controller in a 20-SOIC package, operating at 3.3V with a supply range of 2.97V to 3.63V. It integrates a real-time clock (RTC), nonvolatile RAM controller, microprocessor monitor, and a 3-channel, 8-bit analog-to-digital converter (ADC). Communication utilizes a 3-wire serial interface. The RTC supports leap year compensation up to 2100 and includes an alarm interrupt for system wake-up. The device features automatic battery backup and write protection for external SRAM via VCCO, CEOL, and CEOH pins. Operating temperature ranges from 0°C to +70°C.

Real Time Clock Feature Summary

• Integrates RTC with leap year compensation, NV RAM controller, microprocessor monitor, and 3-channel 8-bit ADC
• Provides automatic battery backup and write protection for external SRAM using VCCO, CEOL, and CEOH pins
• Microprocessor monitor includes power-fail detection, pushbutton reset control, and watchdog timer
• Operates on a simple 3-wire serial interface with 3.3V supply voltage

Real Time Clock Applications

• Low-power portable products requiring integrated timing and monitoring
• Systems utilizing external SRAM requiring automatic backup and write protection
• Applications needing microprocessor reset management and watchdog functionality
• Devices requiring analog input monitoring via the integrated ADC

Real Time Clock Procurement Notes

Verify the specific suffix 'S' indicates the 20-SOIC package variant when sourcing replacements. Confirm lead-free status if '+', RoHS-compliant versions are required for assembly. Check current availability as component lifecycles may vary. Ensure the 3.3V operating voltage aligns with the target system design constraints before procurement.

Real Time Clock Selection Notes

Select the DS1670S for applications requiring a combined RTC, SRAM controller, and microprocessor monitor in a single chip. The 20-SOIC package is suitable for surface-mount assembly where space allows. Ensure the system operates within the 0°C to +70°C temperature range. Verify that the 3-wire interface compatibility exists with the host microcontroller or processor.

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 similarities with other members like the DS1670E but differs in packaging. The device is designed to reduce component count in portable systems by integrating multiple critical functions into one IC.

Real Time Clock Replacement Considerations

Direct replacement options include the DS1670E+ in a TSSOP package, though pinout and physical dimensions differ. Verify electrical compatibility and interface signals when substituting packages. No other direct pin-compatible alternatives are documented in the provided source material.