DS3231 – Precision Real-Time Clock IC

Part Number: DS3231, DS3231SN

Function: Extremely Accurate Real-time Clock (RTC) IC

Package: SO 16 Pin type

Manufacturer: Dallas, Maxim



The DS3231 is a low-cost, extremely accurate I²C real-time clock (RTC) with an integrated temperature-compensated crystal oscillator (TCXO) and crystal. The device incorporates a battery 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 DS3231 is available in commercial and industrial temperature ranges, and is offered in a 16-pin, 300-mil SO package.

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 an 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 through an I²C bidirectional bus.




1. Highly Accurate RTC Completely Manages All Timekeeping Functions

(1) Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year, with Leap-Year Compensation Valid Up to 2100

(2) Accuracy ±2ppm from 0°C to +40°C

(3) Accuracy ±3.5ppm from -40°C to +85°C

(4) Digital Temp Sensor Output: ±3°C Accuracy

(5) Register for Aging Trim

(6) Active-Low RST Output/Pushbutton Reset Debounce Input

(7) Two Time-of-Day Alarms

(8) Programmable Square-Wave Output Signal

2. Simple Serial Interface Connects to Most Microcontrollers

(1) Fast (400kHz) I2C Interface


1. Servers

2. Telematics

3. Utility Power Meters

4. GPS


Official Homepage: https://www.analog.com/en/products/ds3231.html


DS3231 Datasheet PDF


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MAX3232 Datasheet PDF – True RS-232 Transceiver – Maxim

Part Number: MAX3232, MAX3232ESE

Function: 3.0V to 5.5V / up to 1Mbps / True RS-232 Transceiver

Package: 16 Narrow SO, 16 TSSOP, 16 DIP Type

Manufacturer: Maxim




The MAX3222 / MAX3232 / MAX3237 / MAX3241 transceivers have a proprietary low-dropout transmitter output stage enabling true RS-232 performance from a 3.0V to 5.5V supply with a dual charge pump. The devices require only four small 0.1µF external charge-pump capacitors. The MAX3222, MAX3232, and MAX3241 are guaranteed to run at data rates of 120kbps while maintaining RS-232 output levels. The MAX3237 is guaranteed to run at data rates of 250kbps in the normal operating mode and 1Mbps in the MegaBaud operating mode, while maintaining RS-232 output levels.

The deives have 2 receivers and 2 drivers. The MAX3222 features a 1µA shutdown mode that reduces power consumption and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1µA supply current. The ICs are pin, package, and functionally compatible with the industry-standard MAX242 and MAX232, respectively.




1. Notebook, Subnotebook, and Palmtop Computers

2. High-Speed Modems

3. Battery-Powered Equipment

4. Hand-Held Equipment

5. Peripherals

6. Printers


MAX3232 Datasheet PDF

MAX3232 pdf


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