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Analog Devices DS1305EN+ — Discrete Semiconductors

DS1305EN+ RTC Clock/Calendar SPI 20-TSSOP, Active

MPNDS1305EN+
End of Life

Maxim Integrated DS1305EN+ real-time clock/calendar, SPI interface, 96B NVSRAM, trickle-charger, alarm, leap year, 20-TSSOP, -40°C to 85°C, 2V to 5.5V supply.

$7.5Ref. price · indicative, final on quote
Packaging20-TSSOP (0.173", 4.40mm Width)
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

DS1305EN+ specifications
ParameterValue
TypeClock/Calendar
MountingSurface Mount
Voltage2V ~ 5.5V
Voltage - supply, battery2V ~ 5.5V
Current - timekeeping25.3µA ~ 81µA @ 2V ~ 5V
InterfaceSPI
Operating temperature-40°C ~ 85°C
PackageTube
FeaturesAlarm, Leap Year, NVSRAM, Trickle-Charger
Date formatYY-MM-DD-dd
Memory size96B
Time formatHH:MM:SS (12/24 hr)
Case20-TSSOP (0.173\", 4.40mm Width)

Product details

RTC with SPI and integrated backup management

The Maxim Integrated DS1305EN+ is a real-time clock/calendar with a full SPI interface, packing a 96B NVSRAM, alarm, leap-year compensation, and a trickle-charger into a 20-TSSOP package. It keeps time in HH:MM:SS (12/24 hr) and YY-MM-DD-dd formats, drawing 25.3µA to 81µA during timekeeping depending on supply voltage. The part is rated for -40°C to 85°C operation and accepts a main supply of 2V to 5.5V, with a separate battery input on the same voltage range for backup.

The trickle-charger supports a rechargeable backup battery or supercapacitor on the battery input. The battery supply range is 2V to 5.5V.

No last-time-buy or obsolescence notice applies.

Frequently asked questions

What are the exact specifications of the DS1305EN+?

The DS1305EN+ is a clock/calendar RTC with SPI interface, 96B NVSRAM, alarm, leap-year support, and a trickle-charger. It operates from 2V to 5.5V, draws 25.3µA to 81µA in timekeeping, and is rated for -40°C to 85°C. Package is 20-TSSOP.

Can the DS1305EN+ be used with a backup battery?

Yes. The DS1305EN+ has a dedicated battery input rated for 2V to 5.5V, and the integrated trickle-charger supports rechargeable coin cells or supercapacitors without external charging circuitry.

Does DS1305EN+ have a trickle charger?

Yes, the DS1305EN+ includes a trickle-charger feature for recharging a backup battery or supercapacitor directly from the main supply.