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  • DS1390U-33

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Real Time Clock

Manufacturer : Maxim Integrated
Package/Case : MSOP-10
Product Categories : Real Time Clock
Datasheet: DS1390U-33 Datasheet (PDF)
RoHs Status: Lead free/RoHS Compliant
In-stock: 126


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DS1390U-33 Product Details

The low-voltage serial-peripheral interface (SPI) DS1390/DS1391/DS1394 and the low-voltage 3-wire DS1392/DS1393 real-time clocks (RTCs) are clocks/calendars that provide hundredths of a second, seconds, minutes, hours, day, date, month, and year information. The date at the end of the month 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. One programmable time-of-day alarm is provided. A temperature-compensated voltage reference monitors the status of VCC and automatically disables the bus interface and switches to the backup supply if a power failure is detected. On the DS1390, a single open drain output provides a CPU interrupt or a square wave at one of four selectable frequencies. The DS1391 replaces the SQW/active-low INT pin with an active-low RST output/debounced input. The DS1390, DS1391, and DS1394 are programmed serially through an SPI-compatible, bidirectional bus. The DS1392 and DS1393 communicate over a 3-wire serial bus, and the extra pin is used for either a separate interrupt pin or an active-low RST output/debounced input. All five devices are available in a 10-pin μSOP package, and are rated over the industrial temperature range.


  • Real-Time Clock Counts Hundredths of Seconds, Seconds, Minutes, Hours, Day, Date, Month, and Year with Leap-Year Compensation Valid Up to 2100
  • Output Pin Configurable as Interrupt or Square Wave with Programmable Frequency of 32.768kHz, 8.192kHz, 4.096kHz, or 1Hz (DS1390/DS1393/DS1394 Only)
  • One Time-of-Day Alarm
  • Power-Fail Detect and Switch Circuitry
  • Reset Output/Debounced Input (DS1391/DS1393)
  • Separate SQW and INT Output (DS1392)
  • Trickle-Charge Capability
  • SPI Supports Modes 0 and 2 (DS1394)
  • SPI Supports Modes 1 and 3 (DS1390/DS1391)
  • 3-Wire Interface (DS1392/DS1393)
  • 4MHz at 3.0V and 3.3V
  • 1MHz at 1.8V
  • Three Operating Voltages: 1.8V ±5%, 3.0V ±10%, and 2.97 to 5.5V (DS1394: 3.3V ±10%)
  • Industrial Temperature Range: -40°C to +85°C


  • Embedded Time Stamping
  • GPS/Telematics Devices
  • Handheld Devices
  • Medical Devices

DS1390U-33 Block Diagram
(Picture: Diagram)

Technical Parameters

  • Function
  • Clock, Calendar, Alarm, Trickle Charger
  • RTC Bus Interface
  • Serial
  • Time Format
  • HH:MM:SS:hh
  • Supply Voltage Max
  • 5.5 V
  • Supply Voltage Min
  • 2.97 V
  • Maximum Operating Temperature
  • + 85 C
  • Minimum Operating Temperature
  • - 40 C
  • Mounting Style
  • Package / Case
  • uSOP
  • Battery Backup Switching
  • Yes
  • Series
  • DS1390, DS1391, DS1392, DS1393, DS1394
  • Part # Aliases
  • 90-1390U-033

DS1390U-33 Datasheet

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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 DS1390U-33 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 DS1390U-33 devices; we pay more attention to the channels and quality of DS1390U-33 products than any other customer. We strictly implement supplier audits, so you can purchase with confidence.
Q: How to find the detailed information of DS1390U-33 chips? Including MAXIM original factory information, Real Time Clock application, DS1390U-33 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.
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Q: What is the process for returns or replacement of DS1390U-33?
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 DS1390U33 we delivered, we will accept the replacement or return of the DS1390U-33 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 DS1390U-33.
(3)The DS1390U-33 is unused and only in the original unpacked packaging.
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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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