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Data Sheet

FULL DATA SHEET (PDF, 268kB) Download   E-Mail

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.

Key Features		Applications/Uses
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 General-Purpose RAM with Unlimited Writes I²C Serial Interface Programmable Square-Wave Output Signal Automatic Power-Fail Detect and Switch Circuitry -40°C to +85°C Operating Temperature Range Underwriters Laboratories (UL®) Recognized		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)

Diagram

Typical Operating Circuit

Application Notes

Application Note 58: Crystal Considerations with Dallas Real-Time Clocks (RTCs) - DS1338, DS1338, DS1338 Application Note 504: Design Considerations for Dallas Semiconductor Real-Time Clocks - DS1338 Application Note 505: Lithium Coin-Cell Batteries: Predicting an Application Lifetime - DS1338 Application Note 701: Using the DS32kHz with Dallas Real-Time Clocks - DS1338 Application Note 3300: Interfacing I²C Serial Real-Time Clocks to a Microcontroller - DS1338 Application Note 3572: FAQ About the Integrated-Crystal Package Option - DS1338 Application Note 3816: Selecting a Backup Source for Real-Time Clocks - DS1338, DS1338, DS1338 Application Note 3921: Using a DS1307 with a PIC Microcontroller - DS1338, DS1338

Evaluation Kits

none

Design Guides

Real-Time Clocks (PDF)

Reliability Reports

Reliability Report: DS1338.pdf Request Reliability Report for: DS1338C DS1338U DS1338Z Underwriters Laboratories (UL®) Recognized

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-26 of 26
DS1338C	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1338C-33#T&R			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1338C-33#			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1338C-3#			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1338C-18#			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1338C-33			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338C-3			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338C-18			SOIC(W);16 pin;111 mm² Outline Drawing: 21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338U	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1338U-3			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338U-18+			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338U-3+			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338U-3+T&R			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338U-33+T&R			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338U-33+			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338U-18			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338U-33			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338U-33/T&R			µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338Z	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1338Z-3			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338Z-3+T&R			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338Z-18			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338Z-33			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338Z-3/T&R			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338Z-33+T&R			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338Z-33+			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338Z-3+			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1338Z-33/T&R			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1338Z-18+			SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

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