Products > Integrated Circuits (ICs) > Clock & Timer ICs > DS1558Y+

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RTC IC, Date Time Format (Day/Date/Month/Year/Century hh:mm:ss), Bytewide, 4.5 V to 5.5 V, TQFP-48

Manufacturer : Maxim Integrated
Package/Case : TQFP-48
Product Categories : Real Time Clock
Datasheet: DS1558Y+ Datasheet (PDF)
RoHs Status: Rohs
In-stock: 210


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DS1558Y+ Product Details

The DS1558Y+ is a watchdog clock with NVRAM control in 48 pin TQFP package. The device operates at 5V and it is a full function, year 2000 compliant (Y2KC), real time clock/calendar with RTC alarm, watchdog timer, power-on reset, battery monitor and NV SRAM controller. User access to all registers within DS1558Y is accomplished with a bytewide interface. The RTC registers contain century, year, month, date, day, hours, minutes and seconds data in 24 hour BCD format. Corrections for day of month and leap year compensation valid up to the year 2100. The device maps RTC registers into SRAM address space and constantly monitors A0-A18. The DS1558Y provides greater than 10 years of timekeeping and data retention in the absence of power with small lithium coin cells and low leakage SRAM. It can be used with SRAMs up to 524,272 addresses. The DS1558Y has interrupt (active-low IRQ/FT) and reset (active-low RST) outputs that can be used to control CPU activity.



  • Supply voltage range from 4.5V to 5.5V
  • Operating temperature range from -40°C to 85°C
  • Battery voltage level indicator flag
  • Power fail write protection allows for ±10% VCC power supply tolerance
  • UL recognized
  • 4.37V write protection voltage, 70ns read cycle time and 70ns write cycle time
  • Greater than 10 years of timekeeping and data retention in absence of power
  • Precision power-on reset
  • Programmable watchdog timer and RTC alarm
  • Active supply current of 6mA and CMOS standby current of 2mA

DS1558Y+ Block Diagram
(Picture: Diagram)

Technical Parameters

  • Function
  • Clock, Calendar, Watchdog Timekeeper, NV SRAM Control, Alarm
  • RTC Bus Interface
  • Parallel
  • Time Format
  • HH:MM:SS
  • Supply Voltage Max
  • 5.5 V
  • Supply Voltage Min
  • 4.5 V
  • Maximum Operating Temperature
  • + 85 C
  • Minimum Operating Temperature
  • - 40 C
  • Mounting Style
  • Package / Case
  • TQFP-48
  • Packaging
  • Tube
  • Battery Backup Switching
  • Yes
  • Series
  • DS1558, DS1558W, DS1558Y
  • Part # Aliases
  • 90-1558Y+000

DS1558Y+ Datasheet

DS1558Y+ Related Products

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Estimated Delivery Time: Dec 13 - Dec 18 days (choose Expedited at checkout).

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We provide high quality products, thoughtful service and after sale guarantee

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    We have rich products, can meet your various needs.

  • Minimum order quantity starts from 1pcs.

    Minimum order quantity starts from 1pcs.

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    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

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    Step3: Anti-Static Bag

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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 DS1558Y+ 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 DS1558Y+ devices; we pay more attention to the channels and quality of DS1558Y+ products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of DS1558Y+ chips? Including MAXIM original factory information, Real Time Clock application, DS1558Y+ 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 DS1558Y+ 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 DS1558Y+, 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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TT Bank, Paypal, Credit Card, Western Union, and Escrow is all acceptable.
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 DS1558Y+?
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 DS1558Y+ we delivered, we will accept the replacement or return of the DS1558Y+ 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 DS1558Y+.
(3)The DS1558Y+ 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 DS1558Y+ datasheet pdf, DS1558 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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