DS1302SN

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DS1302SN

IC RTC CLK/CALENDAR SER 8-SOIC

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Spécifications

Supplier Analog Devices Inc./Maxim Integrated
Package Tube
ProductStatus Active
Type Clock/Calendar
Features Leap Year, NVSRAM, Trickle-Charger
MemorySize 31B
TimeFormat HH:MM:SS (12/24 hr)
DateFormat YY-MM-DD-dd
Interface 3-Wire Serial
Voltage-Supply 2V ~ 5.5V
Voltage-SupplyBattery 2V ~ 5.5V
Current-Timekeeping(Max) 0.3µA ~ 1µA @ 2V ~ 5V
OperatingTemperature -40°C ~ 85°C
MountingType Surface Mount
Package/Case 8-SOIC (0.209, 5.30mm Width)

Vue d'ensemble

Description

DS1302SN is a compact real-time clock/calendar IC with battery backup and a 3‑wire serial interface. Key points:
- Interface: CE, IO (bidirectional), SCLK (not I2C/SPI) for talking to the chip.
- Clock: 32.768 kHz crystal input (X1/X2) for timekeeping; maintains seconds, minutes, hours, day, date, month, year with leap-year handling.
- Memory: up to 31 bytes of general-purpose RAM.
- Backup: VBAT supply with a built-in trickle-charge circuit to charge a rechargeable backup battery from VCC.
- Power: operates from 2.0–5.5 V.
- Package: 8-pin DS1302SN (DIP8/SOIC8).
Common uses: microcontroller projects needing accurate timekeeping with battery backup (Arduino clocks, data loggers, schedulers). Data registers are written/read in a specific sequence; time data is typically stored in BCD.

Features

DS1302SN features:
- Real-time clock/calendar with seconds, minutes, hours, date, month, day-of-week, year; leap-year aware; supports 12/24-hour mode
- 32.768 kHz crystal oscillator; CH bit to halt the clock
- 31 bytes of RAM for general data storage
- Battery-backed operation via VBAT; RTC keeps time during main-power loss
- Trickle-charge circuit to charge a backup cell or supercapacitor via an external resistor network
- 3-wire serial interface (CE, CLK, IO) with an SPI-like protocol
- SQW/32 kHz output with programmable frequency (and can be disabled)
- 2.0–5.5 V supply range; low power in battery mode
- Available in 8-pin DS1302SN package (DIP-8/SOIC-8)

Package

DS1302SN is an 8-pin SOIC (SOP-8) surface-mount package.

Pinout

- Pin count: 8 pins (DIP-8/SO-8 package, DS1302SN).
- Function: Real-time clock/calendar with 31 bytes of RAM and a 3-wire serial interface (CE, CLK, IO). It uses VCC for normal operation and VBAT for battery backup to maintain time when power is off. Provides time/date registers (seconds, minutes, hours, day, date, month, year). Two pins may be unused/no-connect depending on package variant.

Manufacturer

The DS1302SN is manufactured by Dallas Semiconductor Corporation. Dallas Semiconductor was an American semiconductor company that designs and manufactures integrated circuits (ICs), including real-time clocks. The company was later acquired by Maxim Integrated, and Maxim (in turn) is now part of Analog Devices.

Application

DS1302SN is a real-time clock with battery-backed RAM and a 32.768 kHz oscillator. Typical applications:
- Real-time clock/calendar for embedded systems
- Time stamping and event logging in data loggers and sensors
- Alarm, timer and scheduling for automation and appliances
- Battery-backed RAM for small data storage in portable devices
- Digital clocks, handheld devices, POS terminals, and access-control systems
- Power-loss safe timekeeping for microcontroller projects

Expédition

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Référence des frais d'expédition (DHL/FedEx):

DHL: Les frais d'expédition vont de 25 à 45 $ (0,5 kg), avec un délai de livraison estimé de 2 à 5 jours ouvrables.

FedEx: Les frais d'expédition varient de 25 à 40 $ (0,5 kg), avec un délai de livraison estimé de 3 à 7 jours ouvrables.

UPS: Les frais d'expédition vont de 25 à 45 $ (0,5 kg), avec un délai de livraison estimé de 3 à 7 jours ouvrables.

TNT: Les frais d'expédition varient de 25 à 65 $ (0,5 kg), avec un délai de livraison estimé de 3 à 7 jours ouvrables.

EMS: Les frais d'expédition varient de 30 à 50 $ (0,5 kg), avec un délai de livraison estimé de 7 à 15 jours ouvrables.

Courrier aérien enregistré: Le coût d'expédition est de 2 à 4 $ (0,1 kg), avec un délai de livraison estimé de 5 à 20 jours ouvrables.

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