DS1338C-3#

Real Time Clock Overview

The DS1338C-3# is a low-power serial real-time clock (RTC) and calendar integrated circuit manufactured by Analog Devices Inc./Maxim Integrated. It features a full binary-coded decimal (BCD) clock/calendar with 56 bytes of non-volatile SRAM. The device operates via an I2C interface and includes automatic power-fail detection to switch between VCC and backup supply. Key specifications include a supply voltage range of 2.7V to 5.5V, standby current of 80µA to 125µA at 3.3V, and an operating temperature range of -40°C to +85°C. The package is a 16-pin SOIC (0.300" width).

Real Time Clock Feature Summary

• Integrated 32.768kHz crystal in the package for space savings.
• Automatic power-fail detect and switch circuitry.
• 56-byte battery-backed NV SRAM with unlimited writes.
• Programmable square-wave output signal.

Real Time Clock Applications

• Handhelds (GPS, POS Terminal)
• Consumer Electronics (Set-Top Box, Digital Recording)
• Office Equipment (Fax/Printer, Copier)
• Medical (Glucometer, Medicine Dispenser)
• Telecommunications (Router, Switcher, Server)

Real Time Clock Procurement Notes

Verify the RoHS compliance status indicated by the '#' suffix, which denotes a lead-free/RoHS-compliant device potentially including exempt lead. Confirm the specific voltage variant (DS1338C-3# corresponds to the 3.0V nominal supply range) matches the system requirements before ordering.

Real Time Clock Selection Notes

Select the DS1338C-3# when a 16-pin surface-mount package is required instead of the 8-pin alternative. Ensure the application utilizes a 2.7V to 5.5V primary supply. The integrated crystal simplifies layout but requires adherence to specific PCB isolation guidelines to maintain accuracy.

Real Time Clock Part Context

This component belongs to the DS1338 family of serial RTCs. The 'C' designation indicates the inclusion of an integrated crystal, distinguishing it from the 'Z' series which requires an external crystal. The '-3#' suffix specifies the 3.0V nominal supply voltage variant with RoHS compliance.

Real Time Clock Replacement Considerations

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