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Analog Devices DS1390U-33+ — DC-DC Power Modules
Analog Devices

DS1390U-33+ Real Time Clock, SPI, Industrial Temp, 10-uMAX

MPNDS1390U-33+
End of Life

Maxim Integrated DS1390U-33+, SPI Real-Time Clock/Calendar, 10-uMAX/uSOP, 2.97V–5.5V supply, -40°C to 85°C, alarm, trickle-charger, square-wave output.

$5.15Ref. price · indicative, final on quote
DS1390U-33+ datasheet
Packaging10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
StockContact for availability
MOQ1 pcs
  • 100% new & originalTraceable channels only — no refurbs, no pulls, no remarked parts.
  • Date & lot codes on quoteStated per line before you commit; label photos on request.
  • MSL-compliant ESD packingMoisture-sealed bags with indicator cards; reels photo-verified.
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Specifications

DS1390U-33+ Technical Specifications
ParameterValue
TypeClock/Calendar
Mounting typeSurface Mount
Voltage2.97V ~ 5.5V
Voltage - supply, battery1.3V ~ 5.5V
Current - timekeeping175µA @ 2.97V ~ 5.5V
InterfaceSPI
Operating temperature-40°C ~ 85°C
PackageTube
FeaturesAlarm, Leap Year, Square Wave Output, Trickle-Charger
Date formatYY-MM-DD-dd
Time formatHH:MM:SS:hh (12/24 hr)
Case10-TFSOP, 10-MSOP (0.118\", 3.00mm Width)

Product details

SPI RTC with battery backup and trickle-charger

The Maxim Integrated DS1390U-33+ is a SPI-bus real-time clock/calendar in a 10-pin uMAX/uSOP surface-mount package. It tracks time in HH:MM:SS:hh (12/24 hr) and date in YY-MM-DD-dd format, with an integrated alarm, square-wave output, and a trickle-charger for backup battery maintenance. Rated for -40°C to 85°C operation, this part fits industrial control, outdoor telecom, and factory-automation panels where the RTC must keep time through power loss and temperature swings.

Lifecycle and compliance

It is ROHS3 compliant.

Frequently asked questions

What SPI modes does the DS1390U-33+ support?

The DS1390U-33+ uses an SPI interface. The datasheet details the supported modes and timing; typical SPI RTCs from Maxim operate in mode 0 or mode 3. Verify the exact mode against the timing diagram for your MCU's SPI peripheral.

Is DS1390U-33+ a drop-in replacement for DS1390U-33?

The DS1390U-33+ is the ROHS3-compliant version of the DS1390U-33. Pinout and footprint are identical; the only difference is the lead-free finish. It is a drop-in replacement for existing designs using the non-RoHS variant.