DS1673E-3+T&R

Real Time Clock Overview

The DS1673E-3+T&R is a portable system controller in a 20-pin TSSOP package, operating at +3.0V with a 0°C to +70°C temperature range. It integrates a real-time clock (RTC) with leap year compensation, a microprocessor monitor, NV SRAM controller, and a 3-channel 8-bit ADC. Communication uses a 3-wire serial interface. The RTC supports alarms for system wake-up. Automatic battery backup and write protection manage external SRAM via VCCO, CEOL, and CEOH pins. The device includes watchdog timer functionality and pushbutton reset control.

Real Time Clock Feature Summary

• Integrates RTC, NV RAM controller, microprocessor monitor, and 3-channel 8-bit ADC
• Supports automatic battery backup and write protection for external SRAM
• Features a watchdog timer with selectable time delays of 250ms, 500ms, or 1000ms
• Uses a simple 3-wire serial interface for communication

Real Time Clock Applications

• Low-power portable products requiring integrated timing and memory control
• Microprocessor-based systems needing power-fail monitoring and reset generation
• Battery-operated devices utilizing external SRAM with nonvolatile retention

Real Time Clock Procurement Notes

Verify the specific ordering suffix '+T&R' corresponds to tape-and-reel packaging as indicated in the manufacturer's ordering information table. Confirm that the 'E' suffix denotes the extended commercial temperature range of 0°C to +70°C. Ensure compatibility with the 20-pin TSSOP footprint during procurement planning.

Real Time Clock Selection Notes

Select this component when a combined RTC, SRAM controller, and microprocessor monitor is required in a single IC. The +3.0V voltage variant is suitable for low-voltage systems. Consider the 3-channel ADC if analog input monitoring is necessary. Verify that the 3-wire interface matches the host processor's available serial ports.

Real Time Clock Part Context

The DS1673E-3+T&R belongs to the DS1673 family of portable system controllers. The 'E' indicates the commercial temperature grade, while '+T&R' specifies lead-free/RoHS compliance and tape-and-reel packaging. This part consolidates functions typically handled by multiple discrete components, simplifying PCB layout for portable applications.

Real Time Clock Replacement Considerations

Direct pin-compatible replacements within the same family include the DS1673E-5+T&R for +5.0V operation. Other variants like DS1673S-3+ offer different package options but maintain functional equivalence. Verify voltage requirements and package dimensions before substitution.