DS1670E/T&R

Real Time Clock Overview

The DS1670E/T&R 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 battery backup input. The RTC provides timekeeping with leap year compensation up to the year 2100 and supports alarm interrupts for system wake-up. Communication utilizes a simple 3-wire serial interface. The device includes automatic write protection and power switching for external SRAM via VCCO, CEOL, and CEOH pins. It functions within a 0°C to +70°C temperature range in a 20-pin TSSOP package.

Real Time Clock Feature Summary

• Integrates RTC with leap year compensation, NV RAM controller, microprocessor monitor, and 3-channel 8-bit ADC
• Supports 3-wire serial interface for communication with host processors
• Provides automatic battery backup and write protection for external SRAM using VCCO, CEOL, and CEOH pins
• Includes microprocessor monitor with power-fail detection, pushbutton reset control, and configurable watchdog timer

Real Time Clock Applications

• Low-power portable products requiring integrated system management
• Battery-backed systems needing automatic SRAM retention during power loss
• Microprocessor-based designs requiring hardware watchdog and reset monitoring

Real Time Clock Procurement Notes

Verify that the ordering suffix /T&R corresponds to the tape-and-reel packaging format specified in the manufacturer's ordering information. Confirm that the component meets the 0°C to +70°C operating temperature range requirements for the intended application environment. Ensure compatibility with the 20-TSSOP footprint.

Real Time Clock Selection Notes

Select this component when a single-chip solution is required for RTC, SRAM backup, and processor monitoring in portable devices. The device requires an external 32.768kHz quartz crystal with a 6pF load capacitance for accurate timekeeping. Ensure the external SRAM voltage levels match the VCCO output characteristics and that the 3-wire interface signals are compatible with the host logic levels.

Real Time Clock Part Context

The DS1670E/T&R belongs to the DS1670 family of portable system controllers manufactured by Analog Devices Inc./Maxim Integrated. The base part number DS1670 encompasses various package options including TSSOP and SO. The 'E' designation typically indicates the industrial temperature grade (0°C to +70°C), while '+T&R' specifies lead-free/RoHS compliance and tape-and-reel packaging.

Real Time Clock Replacement Considerations

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