DS1308U-18+

$6.22

Description：IC RTC CLOCK/CALENDAR I2C 8UMAX
Series：-

SKU:1507776bee97 Category: Real Time Clocks Brand: Analog Devices Inc./Maxim Integrated

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Product introduction

DS1308U-18+ is listed in the Real Time Clock range at ChipApex. The manufacturer field lists Analog Devices Inc./Maxim Integrated. Its product description is IC RTC CLOCK/CALENDAR I2C 8UMAX. Review the specifications below when checking this part for your BOM.

Real Time Clock specifications for DS1308U-18+

Description：IC RTC CLOCK/CALENDAR I2C 8UMAX
Series：-
Package：Tube
Mfr：Analog Devices Inc./Maxim Integrated
Type：Clock/Calendar
Features：Leap Year, NVSRAM, Square Wave Output
Memory Size：56B
Time Format：HH:MM:SS (12/24 hr)
Date Format：YY-MM-DD-dd
Interface：I2C, 2-Wire Serial
Voltage - Supply：1.71V ~ 5.5V
Voltage - Supply, Battery：1.3V ~ 5.5V
Current - Timekeeping (Max)：100µA @ 200µA @ 1.89V ~ 5.5V
Operating Temperature：-40°C ~ 85°C
Mounting Type：Surface Mount
Grade：-
Qualification：-
Package / Case：8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
Supplier Device Package：8-uMAX/uSOP

Real Time Clock datasheet and documents for DS1308U-18+

DS1308U-18+

Real Time Clock Overview

The DS1308U-18+ is a low-power serial real-time clock (RTC) and 56-byte NV RAM device from Analog Devices/Maxim Integrated. It operates on an I2C interface with a supply voltage range of 1.71V to 5.5V. The RTC provides full BCD clock/calendar data including leap-year compensation up to the year 2400. Key electrical parameters include a typical standby current of 250nA at VBAT=3V, a power-fail trip point (VPF) of 1.45V to 1.70V for the -18 variant, and an operating temperature range of -40°C to +85°C. It features automatic switchover to battery backup upon power failure.

Real Time Clock Feature Summary

I2C Serial Interface with Slave Address D0h
Low-Power Operation: 250nA typical battery current
Automatic Power-Fail Detection and Switch Circuitry
56-Byte Battery-Backed General-Purpose RAM

Real Time Clock Applications

Handhelds (GPS, POS Terminal)
Consumer Electronics (Set-Top Box, Digital Recording)
Office Equipment (Fax/Printer, Copier)
Medical Devices (Glucometer, Medicine Dispenser)

Real Time Clock Procurement Notes

Verify the specific ordering suffix '-18+' confirms the 1.71V–5.5V operating voltage range and the associated power-fail trip point characteristics. Confirm package availability in FSOP or uSOP formats as required by the design. Check for end-of-life status or alternative sourcing if production continuity is critical.

Real Time Clock Selection Notes

Select the DS1308U-18+ when the system requires an I2C RTC with a minimum operating voltage down to 1.71V. Ensure the external crystal meets the 6pF load capacitance and 100kΩ ESR specifications for reliable startup. Verify that the application can accommodate the open-drain I/O requirements with appropriate pull-up resistors.

Real Time Clock Part Context

The DS1308U-18+ belongs to the Maxim Integrated DS1308 family of low-current I2C real-time clocks. The 'U' indicates the package type, while the '-18+' specifies the voltage range variant (1.71V to 5.5V). This component serves as a precise timekeeping solution with non-volatile memory for systems requiring accurate date and time tracking during power outages.