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Analog Devices DS1342U+T&R — DC-DC Power Modules
Analog Devices

Maxim DS1342U+T&R RTC Clock/Calendar, I2C, 8-uMAX

MPNDS1342U+T&R
End of Life

Maxim DS1342U+T&R, Clock/Calendar RTC, I2C 2-Wire Serial, Alarm/Leap Year/Square Wave Output, 1.8V-5.5V, -40°C to 85°C, 8-uMAX/uSOP, Tape & Reel.

$3.67Ref. price · indicative, final on quote
DS1342U+T&R datasheet
Packaging8-TSSOP, 8-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.
  • PayPal buyer protectionPay by T/T, PayPal or Payoneer — card payments covered end to end.

Specifications

DS1342U+T&R Technical Specifications
ParameterValue
TypeClock/Calendar
Mounting typeSurface Mount
Voltage1.8V ~ 5.5V
Current - timekeeping0.6µA ~ 0.7µA @ 3V ~ 5V
InterfaceI²C, 2-Wire Serial
Operating temperature-40°C ~ 85°C
PackageTape & Reel (TR); Cut Tape (CT)
FeaturesAlarm, Leap Year, Square Wave Output
Date formatYY-MM-DD-dd
Time formatHH:MM:SS (12/24 hr)
Case8-TSSOP, 8-MSOP (0.118\", 3.00mm Width)

Product details

Device overview and key features

Timekeeping current is specified at 0.6µA to 0.7µA at 3V to 5V, which is the headline spec for battery-backed applications where every microamp matters. The industrial temperature range of -40°C to 85°C covers most embedded, telecom, and industrial equipment environments.

Lifecycle and sourcing status

The DS1342U+T&R is listed as Active on the manufacturer's lifecycle record and is ROHS3 compliant. This is not an NRND or EOL part — it remains a current-production device suitable for new designs and ongoing production. There is no last-time-buy window to track, and no PCN-driven urgency to secure inventory. As an active Maxim (now Analog Devices) RTC, the DS1342U+T&R is available through independent distribution channels.

I2C interface and integration notes

Communication is via a standard I2C 2-wire serial interface, which requires only SDA and SCL lines plus pull-up resistors. The DS1342U+T&R functions as an I2C slave device. The alarm feature generates an interrupt or can be polled; the square-wave output provides a programmable frequency reference without needing an external oscillator buffer.

Frequently asked questions

What is the DS1342U+T&R vs the DS1340?

The DS1340 is an earlier-generation RTC in the same family with similar I2C interface and timekeeping functionality. The DS1342U+T&R adds a programmable square-wave output and operates down to 1.8V (vs 2.7V for the DS1340), which is the key differentiator for low-voltage or battery-backed designs. Both are pin-compatible in the 8-uMAX package, but the DS1342 is the preferred choice for new designs requiring the wider supply range and square-wave feature.

What is the DS1342U+T&R package and footprint?

The DS1342U+T&R is supplied in an 8-uMAX/uSOP package, which is footprint-compatible with 8-TSSOP and 8-MSOP (0.118", 3.00mm width). The T&R suffix means it ships in Tape & Reel format for pick-and-place assembly. The mounting type is Surface Mount.

How do I set the alarm on the DS1342?

The alarm is configured through the I2C interface by writing to the alarm registers (seconds, minutes, hours, day/date). The alarm can be set to trigger on a match of seconds, minutes, hours, day, or any combination. When the alarm matches, the INT/SQW pin can be configured to output an interrupt signal. Refer to the device datasheet for the register map and programming sequence.