Skip to main content
Log in
Analog Devices DS1558W+ — DC-DC Power Modules

DS1558W+ Real-Time Clock, Parallel Interface, 48-LQFP

MPNDS1558W+
End of Life

Maxim Integrated DS1558W+ Clock/Calendar RTC, Parallel Interface, 48-LQFP, 2.97V to 3.63V supply, -40°C to 85°C, Alarm, Leap Year, Watchdog Timer, Y2K.

$12.41Ref. price · indicative, final on quote
Analog Devices DS1558W+ datasheet (PDF)
Packaging48-LQFP
RoHSROHS3 Compliant
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

DS1558W+ specifications
ParameterValue
TypeClock/Calendar
MountingSurface Mount
Voltage2.97V ~ 3.63V
Voltage - supply, battery2.5V ~ 3.7V
Current - timekeeping2mA @ 3.3V
InterfaceParallel
Operating temperature-40°C ~ 85°C
PackageTray
FeaturesAlarm, Leap Year, Watchdog Timer, Y2K
Date formatYY-MM-DD-dd
Time formatHH:MM:SS (24 hr)
Case48-LQFP

Product details

What this RTC brings to a timekeeping design

The Maxim Integrated DS1558W+ is a parallel-interface real-time clock/calendar in a 48-LQFP package, handling YY-MM-DD-dd date and HH:MM:SS 24-hour time formats. It runs from a 2.97 V to 3.63 V main supply and draws 2 mA max in timekeeping mode at 3.3 V. On-chip features include a programmable alarm, a watchdog timer, leap-year compensation, and Y2K compliance.

No last-time-buy notice or end-of-life bulletin applies.

The 2 mA timekeeping current — what it means for battery life

If the design relies on a coin cell during main-power loss, that 2 mA figure sets the battery-capacity budget.

Parallel interface — why it matters

The parallel interface means the RTC connects directly to a microprocessor bus without serial-protocol overhead — useful in legacy controller designs where the MCU already has a parallel memory interface. The trade-off is more I/O pins consumed versus an I²C or SPI RTC.

Frequently asked questions

Does DS1558W+ have a watchdog timer?

Yes, the DS1558W+ includes a watchdog timer as one of its on-chip features, along with an alarm, leap-year compensation, and Y2K compliance.

What is the difference between DS1558W+ and DS1558W?

The DS1558W+ is the ROHS3-compliant version of the DS1558W. The electrical and functional specifications — parallel interface, 48-LQFP package, 2.97V to 3.63V supply, industrial temperature range — are identical. The '+' suffix indicates lead-free / RoHS compliance.

What is the closest pin-compatible alternative to DS1558W+?

Within the same family, the DS1558W (non-RoHS version) is pin-compatible and functionally identical. For a different RTC with similar parallel interface and package, the DS1557W+ or DS1556W+ may be considered, but verify pinout and feature set per the respective datasheets.