DS3232S#

Real Time Clock Overview

The DS3232S# is a low-cost, temperature-compensated crystal oscillator (TCXO) integrated with an extremely accurate real-time clock (RTC) and 236 bytes of battery-backed SRAM. Manufactured by Analog Devices Inc./Maxim Integrated, this device maintains seconds, minutes, hours, day, date, month, and year information with automatic leap-year compensation valid up to 2099. It features a fast 400kHz I2C interface and operates within a commercial temperature range of 0°C to +70°C. The part number suffix '#' indicates RoHS compliance. It is housed in a 20-pin SO package.

Real Time Clock Feature Summary

• Accuracy of ±2ppm from 0°C to +40°C and ±3.5ppm from -40°C to +85°C
• Integrated 236-byte battery-backed SRAM for general-purpose storage
• Fast (400kHz) I2C bidirectional serial bus interface
• Two programmable time-of-day alarms and a programmable square-wave output

Real Time Clock Applications

• Servers
• Utility Power Meters
• Telematics GPS

Real Time Clock Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature range. The DS3232S# denotes the commercial temperature variant (0°C to +70°C). Confirm that the '#' suffix aligns with required environmental compliance standards such as RoHS before finalizing procurement orders.

Real Time Clock Selection Notes

Select the DS3232S# when a commercial temperature range (0°C to +70°C) is sufficient for the application environment. For industrial applications requiring operation down to -40°C, the DS3232SN# variant must be selected instead. Ensure the design accommodates the 20-pin SO package dimensions and provides appropriate decoupling capacitors for VCC and VBAT pins as specified in the typical operating circuit.

Real Time Clock Part Context

The DS3232 belongs to the Maxim Integrated RTC family, distinguished by its integrated TCXO which eliminates the need for external crystals. This integration enhances long-term accuracy and reduces manufacturing piece-part counts. The device is designed to maintain accurate timekeeping during main power interruptions via a backup supply input, ensuring continuous operation in critical systems.

Real Time Clock Replacement Considerations

The DS3232SN# serves as the industrial temperature range replacement for the DS3232S#. Both share identical pinouts and functional specifications but differ in their certified operating temperature ranges.