Top

DS1338C, DS1338U, DS1338Z

I²C RTC with 56-Byte NV RAM

Product Details

Key Features

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.71 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 800
CL (pF) 12.5
Memory Type NV SRAM
Memory Size (Bytes) 56
Time of Day Alarms 0
Package/Pins SOIC (N)/8
SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes)
1.68
View Less

Simplified Block Diagram

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Timekeeping & Real-Time Clocks
Interface I2C
VSUPPLY (V) 1.71 to 5.5
Date/ Time Format (hh = sec/100) YY-MM-DD/ HH:MM:SS
Time Keeping Current (nA) (typ) 800
CL (pF) 12.5
Memory Type NV SRAM
Memory Size (Bytes) 56
Time of Day Alarms 0
Package/Pins SOIC (N)/8
SOIC (W)/16
UMAX/8
Budgetary
Price (See Notes)
1.68

Key Features

  • Completely Manages All Timekeeping Functions
    • RTC Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100
    • 56-Byte, Battery-Backed, General- Purpose RAM with Unlimited Writes
    • Programmable Square-Wave Output Signal
  • Surface-Mount Package with an Integrated Crystal (DS1338C) Saves Additional Space and Simplifies Design
  • Interfaces with Most Microcontrollers
    • I2C Serial Interface
  • Low-Power Operation Extends Battery Backup Run Time
    • Automatic Power-Fail Detect and Switch Circuitry
  • -40°C to +85°C Industrial Temperature Range Supports Operation in a Wide Range of Applications
  • Underwriters Laboratories (UL®) Recognized

Applications/Uses

  • Consumer Electronics (Set-Top Box, Digital Recording, Network Appliance)
  • Handhelds (GPS, POS Terminal)
  • Medical (Glucometer, Medicine Dispenser)
  • Office Equipment (Fax/Printer, Copier)
  • Other (Utility Meter, Vending Machine, Thermostat, Modem)
  • Telecommunications (Router, Switcher, Server)

Description

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.

Simplified Block Diagram

DS1338, DS1338C, DS1338U, DS1338Z: Block Diagram DS1338, DS1338C, DS1338U, DS1338Z: Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .