DS3234S# by Analog Devices

Extremely Accurate SPI Bus RTC with Integrated Crystal and SRAM


The DS3234 is a low-cost, extremely accurate SPI™ bus real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The DS3234 incorporates a precision, temperature-compensated voltage reference and comparator circuit to monitor VCC. When VCC drops below the power-fail voltage (VPF), the device asserts the active-low RST output and also disables read and write access to the part when VCC drops below both VPF and VBAT. The active-low RST pin is monitored as a pushbutton input for generating a µP reset. The device switches to the backup supply input and maintains accurate timekeeping when main power to the device is interrupted. The integration of the crystal resonator enhances the long-term accuracy of the device as well as reduces the piece-part count in a manufacturing line. The DS3234 is available in commercial and industrial temperature ranges, and is offered in an industry-standard 300-mil, 20-pin SO package. The DS3234 also integrates 256 bytes of battery-backed SRAM. In the event of main power loss, the contents of the memory are maintained by the power source connected to the VBAT pin. The RTC maintains seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with active-low AM/PM indicator. Two programmable time-of-day alarms and a programmable square-wave output are provided. Address and data are transferred serially by an SPI bidirectional bus.

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Prices starting from US$5.77

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Features

Highly Accurate RTC with Integrated Crystal and SRAM Completely Manages All Timekeeping Functions Accuracy ±2ppm from 0°C to +40°C Accuracy ±3.5ppm from -40°C to +85°C Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year, with Leap Year Compensation Valid Up to 2099 Digital Temp Sensor Output: ±3°C Accuracy Register for Aging Trim Active-Low RST Input/Output Two Time-of-Day Alarms Programmable Square-Wave Output
Accuracy ±2ppm from 0°C to +40°C
Accuracy ±3.5ppm from -40°C to +85°C
Real-Time Clock Counts Seconds, Minutes, Hours, Day, Date, Month, and Year, with Leap Year Compensation Valid Up to 2099
Digital Temp Sensor Output: ±3°C Accuracy
Register for Aging Trim
Active-Low RST Input/Output
Two Time-of-Day Alarms
Programmable Square-Wave Output
Simple Serial Interface Connects to Most Microcontrollers 4MHz SPI Bus Supports Modes 1 and 3
4MHz SPI Bus Supports Modes 1 and 3
Battery-Backup Input for Continuous Timekeeping Low Power Operation Extends Battery Backup Run Time
Low Power Operation Extends Battery Backup Run Time
Operating Temperature Ranges: Commercial: 0°C to +70°C, Industrial: -40°C to +85°C
300-Mil, 20-Pin SO Package
Underwriters Laboratories® (UL) Recognized

Specifications

Frequency 32.768kHz
Osc. Type TCXO
Tuning Adjustment Type Digital
Frequency Output Type CMOS Push-Pull
Frequency Stability (±ppm/yr) (0 to +40°C) 2
Frequency Stability (±ppm/yr) (-40 to 0°C/ +40 to +85°C) 3.5
Frequency Stability (±ppm/yr) (vs. VCC) 1 (typ)
Frequency Stability (±ppm) (vs. Aging) 5 (0-10 Years)
VSUPPLY (V) 2.0 to 5.52.7 to 5.5
Package/Pins SOIC (W)/20
BudgetaryPrice (See Notes) 4.85


DS3234S# Clock,Timing & Frequency Management by Analog Devices

RTC, 0 TO 70DEG C

Status: Unknown
Series: -
RoHS: Compliant
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

RoHS Compliant YES

Alternative Descriptions

Extremely Accurate SPI Bus RTC | Analog Devices
Rtc, 0 To 70Deg C Rohs Compliant: Yes |Maxim Integrated/analog Devices DS3234S# | Newark Electronics

Frequently Asked Questions

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Is the DS3234S# RoHS compliant?

This part has not been flagged as RoHS Compliant.

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