Products > Integrated Circuits (ICs) > Clock & Timer ICs > DS1308U-18+
  • DS1308U-18+

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RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss), I2C, 1.71 V to 5.5 V, µSOP-8

Manufacturer : Maxim Integrated
Package/Case : uSOP-8
Product Categories : Real Time Clock
Datasheet: DS1308U-18+ Datasheet (PDF)
RoHs Status: Rohs
In-stock: 240


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DS1308U-18+ Product Details

The DS1308U-18+ is a low current I2C RTC with 56byte NV RAM in 8 pin µSOP package. This serial real-time clock (RTC) is a full binary coded decimal (BCD) clock/calendar plus 56bytes of NV RAM. 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 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 an AM/PM indicator. It has a built-in power sense circuit that detects power failures and automatically switches to backup supply, maintaining time and date operation. It is used in office equipment (fax/printer, copier), telecommunications (router, switcher, server) and other (utility meter, vending machine, thermostat, modem).


  • Supply voltage range is 1.71V to 5.5V
  • Operating temperature range from -40°C to 85°C
  • Compatible with crystal ESR up to 100Kohm allows crystal to be optimized for cost & space
  • Low power operation extends battery backup run time, low timekeeping current of 250nA (typ)
  • Power fail trip point is 1.62V
  • Completely manages all timekeeping functions
  • 56 byte, battery backed, general-purpose RAM with unlimited writes
  • Programmable square wave output signal
  • Simple serial port interfaces with most microcontrollers
  • 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)

DS1308U-18+ Block Diagram
(Picture: Diagram)

Technical Parameters

  • Function
  • Clock, Calendar
  • RTC Bus Interface
  • I2C
  • RTC Memory Size
  • 56 B
  • Supply Voltage Max
  • 5.5 V
  • Supply Voltage Min
  • 1.71 V
  • Maximum Operating Temperature
  • + 85 C
  • Mounting Style
  • Package / Case
  • uSOP-8
  • Series
  • DS1308
  • Part # Aliases
  • 90-1308U+018

DS1308U-18+ Datasheet

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Estimated Delivery Time: Jun 29 - Jul 04 days (choose Expedited at checkout).

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  • 7-30 days

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  • charge 3.5% service fee.
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We provide high quality products, thoughtful service and after sale guarantee

  • We have rich products, can meet your various needs.

    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

  • Lowest international shipping fee starts from US$2.00.

    Lowest international shipping fee starts from US$2.00.

  • 90 days quality guarantee for all products.

    90 days quality guarantee for all products.


  • Step1:Product

    Step1: Products

  • Step2:Vacuum packaging

    Step2: Vacuum Packaging

  • Step3:Anti-static bag

    Step3: Anti-Static Bag

  • Step4:Individual packaging

    Step4: Individual Packaging

  • Step5:Packaging boxes

    Step5: Packaging Boxes

  • Step6:bar-code shipping tag

    Step6: Bar-Code Shipping Tag

All the products will packing in anti-staticbag. Ship with ESD antistatic protection.

Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.

We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.

After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.

Jotrin ESD packing


1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.

2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.


Q: How does Jotrin guarantee that DS1308U-18+ is the original manufacturer or agent of MAXIM?
We have a professional business development department to strictly test and verify the qualifications of MAXIM original manufacturers and agents. All MAXIM suppliers must pass the qualification review before they can publish their DS1308U-18+ devices; we pay more attention to the channels and quality of DS1308U-18+ products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of DS1308U-18+ chips? Including MAXIM original factory information, Real Time Clock application, DS1308U-18+ pictures?
You can use Jotrin's intelligent search engine, or filter by Timekeeping & Real-Time Clocks category, or find it through Maxim Integrated Information page.
Q: Are the MAXIM's DS1308U-18+ price and stock displayed on the platform accurate?
The MAXIM's inventory fluctuates greatly and cannot be updated in time, it will be updated periodically within 24 hours. After submitting an order for DS1308U-18+, it is recommended to confirm the order with Jotrin salesperson or online customer service before payment.
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Yes. We accept offline orders.
We can provide order placement service. You only need to log in, click "My Orders" to enter the transaction management, and you will see the "Order Details" interface. After checking it, select all and click "Place Order". In addition, you can enjoy coupons or other selected gifts when placing orders online.
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Q: How is the shipping arranged and track my package?
Customers can choose industry-leading freight companies, including DHL, FedEx, UPS, TNT, and Registered Mail.
Once your order has been processed for shipment, our sales will send you an e-mail advising you of the shipping status and tracking number.
Note: It may take up to 24 hours before carriers will display tracking information. In normal conditions, Express delivery needs 3-5 days, Registered Mail needs 25-60 days.
Q: What is the process for returns or replacement of DS1308U-18+?
All goods will implement Pre-Shipment Inspection (PSI), selected at random from all batches of your order to do a systematic inspection before arranging the shipment. If there is something wrong with the DS1308U18+ we delivered, we will accept the replacement or return of the DS1308U-18+ only when all of the below conditions are fulfilled:
(1)Such as a deficiency in quantity, delivery of wrong items, and apparent external defects (breakage and rust, etc.), and we acknowledge such problems.
(2)We are informed of the defect described above within 90 days after the delivery of DS1308U-18+.
(3)The DS1308U-18+ is unused and only in the original unpacked packaging.
Two processes to return the products:
(1)Inform us within 90 days
(2)Obtain Requesting Return Authorizations
More details about return electronic components please see our Return & Change Policy.
Q: How to contact us and get support, such as DS1308U-18+ datasheet pdf, DS1308 pin diagram?
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Maxim Integrated Products is a global range of linearity, mixed-signal integrated circuits (IC) design, R & D and manufacturing leader, has designed, developed, and manufactured analog, mixed-signal, high-frequency, and digital circuits that enable all four of these key interactions....
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