Products > Integrated Circuits (ICs) > Clock & Timer ICs > DS1390U-3+
  • DS1390U-3+

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Alarm RTC IC, Date Time Format (Day/Date/Month/Year hh:mm:ss:hh), SPI, 2.7 V to 3.3 V, µSOP-10

Manufacturer : Maxim Integrated
Package/Case : MSOP-10
Product Categories : Real Time Clock
Datasheet: DS1390U-3+ Datasheet (PDF)
RoHs Status: Rohs
In-stock: 400


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DS1390U-3+ Product Details

The DS1390U-3+ is a low voltage SPI real time clock (RTC) with trickle charger in 10 pin µSOP package. It has typical operating voltage of 3V. This clock/calendar provides hundredths of seconds, 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 leap year compensation valid up to 2100. The clock operates in either 24hour or 12hour format with an AM/PM indicator. A temperature compensated voltage reference monitors the status of VCC and automatically disables bus interface and switches to backup supply if a power failure is detected. On the DS1390, a single open-drain output provides CPU interrupt or square wave at one of four selectable frequencies of 32.768KHz, 8.192KHz, 4.096KHz or 1Hz. The device is programmed serially through SPI compatible bidirectional bus. The DS1390U-3+ is used in GPS/telematics devices, embedded time stamping applications.


  • Supply voltage range from 2.7V to 3.3V
  • Operating temperature range from -40°C to 85°C
  • Power fail detect and switch circuitry
  • SPI supports modes 1 and 3
  • SCLK frequency of 4MHz ( 2.7V <= VCC <= 5.5V)
  • UL recognized
  • VCC active supply current of 2mA and VCC standby current of 80µA
  • Time keeping current of 500nA
  • One programmable time of day alarm
  • Embedded Time Stamping; GPS/Telematics Devices; Handheld Devices; Medical Devices


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

DS1390U-3+ Block Diagram
(Picture: Diagram)

Technical Parameters

  • Function
  • Clock, Calendar, Alarm, Trickle Charger
  • RTC Bus Interface
  • SPI
  • Date Format
  • YY:MM:DD
  • Time Format
  • HH:MM:SS:hh
  • Supply Voltage Max
  • 3.3 V
  • Supply Voltage Min
  • 2.7 V
  • Maximum Operating Temperature
  • + 85 C
  • Minimum Operating Temperature
  • - 40 C
  • Mounting Style
  • Package / Case
  • MSOP-10
  • Packaging
  • Tube
  • Battery Backup Switching
  • Yes
  • Series
  • DS1390, DS1391, DS1392, DS1393, DS1394
  • Part # Aliases
  • 90-1390U+003

DS1390U-3+ Datasheet

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(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-3+.
(3)The DS1390U-3+ is unused and only in the original unpacked packaging.
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