DS1305EN

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DS1305EN

IC RTC CLK/CALENDAR SPI 20-TSSOP

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Specifications

Supplier Analog Devices Inc./Maxim Integrated
Package Tube
ProductStatus Active
Type Clock/Calendar
Features Alarm, Leap Year, NVSRAM, Trickle-Charger
MemorySize 96B
TimeFormat HH:MM:SS (12/24 hr)
DateFormat YY-MM-DD-dd
Interface SPI
Voltage-Supply 2V ~ 5.5V
Voltage-SupplyBattery 2V ~ 5.5V
Current-Timekeeping(Max) 25.3µA ~ 81µA @ 2V ~ 5V
OperatingTemperature -40°C ~ 85°C
MountingType Surface Mount
Package/Case 20-TSSOP (0.173, 4.40mm Width)

Overview

Description

DS1305EN is Maxim/Dallas’ serial real-time clock (RTC) with battery-backed RAM. Key ideas:
- Timekeeping with a calendar (seconds, minutes, hours, day, date, month, year) using a 32.768 kHz crystal.
- Battery-backed RAM for non-volatile data storage, preserved during power loss.
- SPI-like 4-wire serial interface (CS, SCK, SI, SO) to read/write time, calendar, alarms, and RAM.
- Power-fail/battery backup support to keep time running when primary power is off.
- Intended for low-power embedded systems; typically available in 8-pin packages (DIP8/SOIC8).
Note: the EN suffix denotes a specific variant (packaging/temperature grade) of the DS1305 family. Check the datasheet for exact RAM size, voltage range, timing, and register map for your design.

Features

DS1305EN features (concise):
- Real-time clock/calendar: tracks seconds, minutes, hours, day, date, month, year; leap-year aware; supports 24/12-hour formats.
- 32.768 kHz crystal input for accurate timekeeping.
- Battery-backup operation with automatic switchover; includes trickle-charge circuit for backup source (coin cell or supercap).
- Battery-backed non-volatile RAM for user data storage.
- Programmable output options: interrupt/alarm outputs and a configurable square-wave output.
- Serial interface for host communication (read/write time, RAM, and control registers).
- Low power consumption in battery-backup mode.
- 8-pin package (DIP/SOIC) with typical application-friendly features for embedded systems.
Note: exact RAM size, voltage range, and temperature range can vary by revision; consult the DS1305EN datasheet for precise specifications.

Package

DS1305EN is an 8-pin device, available in DIP-8 and SO-8 (plastic surface-mount) package variants.

Pinout

- Pin count: 8 pins (DIP-8/SOIC-8)
- Function: Real-Time Clock (RTC) with calendar/timekeeping (time, date, year) and battery-backed memory; communicates with a host MCU via a serial interface (SPI-like).

Manufacturer

- Manufacturer: Dallas Semiconductor (DS) — now part of Maxim Integrated, and in turn part of Analog Devices.
- What kind of company: A United States–based semiconductor company that designs and manufactures integrated circuits (analog/mixed-signal ICs, including real-time clocks like the DS1305).

Application

DS1305EN 的应用领域包括：
- 实时时钟/日历与闹钟，低功耗应用
- 带时间戳的数据记录与日志系统
- 电池备份的非易失性存储（配置/数据）
- 家电、消费电子、工业自动化的定时与计划
- 工业计量、能源计量、POS 等的时间同步
- 便携式/物联网设备的时间管理与计时

Equivalent

DS1305EN is a Dallas/Maxim RTC with calendar and backup. Equivalent RTCs (depending on interface/packaging) include:
- DS1307 – I2C RTC, 32kHz crystal, battery backup
- DS3231 – I2C RTC, high-accuracy TCXO
- DS1337/DS1338 – I2C RTC with battery
- MCP7940N – I2C RTC with battery
- PCF8563 – I2C RTC
- ISL1208 – I2C RTC
- RV-8803-C2 – I2C RTC
Note: verify interface, voltage, and pin compatibility for your design.

Shipping

Shipping MethodsWe

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Shipping Fee Reference (DHL/FedEx):

DHL: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 2-5 business days.

FedEx: Shipping cost ranges from $25-$40 (0.5kg), with an estimated delivery time of 3-7 business days.

UPS: Shipping cost ranges from $25-$45 (0.5kg), with an estimated delivery time of 3-7 business days.

TNT: Shipping cost ranges from $25-$65 (0.5kg), with an estimated delivery time of 3-7 business days.

EMS: Shipping cost ranges from $30-$50 (0.5kg), with an estimated delivery time of 7-15 business days.

Registered Air Mail: Shipping cost is $2-$4 (0.1kg), with an estimated delivery time of 5-20 business days.

Payments

Payment Methods

The Payment term is 100% Prepaid.

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3. Wire Transfer

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