Product Summary

The DS1338 serial real-time clock (RTC) is a low-
power, full binary-coded decimal (BCD)
clock/calendar plus 56 bytes of NV SRAM. Address
and data are transferred serially through an I2C
interface. The clock/calendar provides seconds, minutes, hours, day, date, month, and year
information. The end of the month date 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 AM/PM indicator. The DS1338 has a built-in power-
sense circuit that detects power failures and automatically switches to the backup supply, maintaining time and date operation

Features

RTC Counts Seconds, Minutes, Hours, Date
of the Month, Month, Day of the Week, and
Year with Leap-Year Compensation Valid Up
to 2100
?? Available in a Surface-Mount Package with an
Integrated Crystal (DS1338C)
?? 56-Byte Battery-Backed NV RAM for Data
Storage
?? I2C Serial Interface
?? Programmable Square-Wave Output Signal
?? Automatic Power-Fail Detect and Switch
Circuitry
?? -40°C to +85°C Operating Temperature Range
?? Underwriters Laboratory (UL) Recognized

Diagrams

Image Part No Mfg Description Data Sheet Download Pricing
(USD)
Quantity
DS1338U-33
DS1338U-33

Maxim Integrated Products

Real Time Clock I2C Serial RTC w/56 Byte NV RAM

Data Sheet

0-6920: $1.11
DS1338U-33/T&R
DS1338U-33/T&R

Maxim Integrated Products

Real Time Clock I2C Serial RTC w/56 Byte NV RAM

Data Sheet

0-7490: $0.92
DS1338U-33+T&R
DS1338U-33+T&R

Maxim Integrated Products

Real Time Clock I2C Serial RTC w/56 Byte NV RAM

Data Sheet

0-1: $1.60
1-25: $1.51
25-50: $1.02
50-100: $0.86
DS1338U-33+
DS1338U-33+

Maxim Integrated Products

Real Time Clock I2C Serial RTC w/56 Byte NV RAM

Data Sheet

0-1: $2.07
1-25: $1.39
25-50: $1.01
50-100: $1.00