DS1305 The DS1305 is a Serial Alarm Real Time Clock IC. It features 96 bytes of non-volatile RAM and supports SPI and 3-wire interfaces.
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DS1305

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The DS1305 is a Serial Alarm Real Time Clock IC. It features 96 bytes of non-volatile RAM and supports SPI and 3-wire interfaces.
✓ Total Stock: 494 pcs
$ Price Range: $7.69

DS1305 Available from 1 distributor

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✓ Non-Authorised
Distributor Stock Pricing MOQ PKG Lead Time Date Code On Order Quantity On Order Delivery
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494 pcs
494 pcs On Request 1 On Request On Request 01+ On Request On Request

DS1305 Specifications Quick View

Most important parameters for selection – full specs in datasheet.
Category
Manufacturer Name
Interface
Mounting Type
Operating Temperature
Voltage

DS1305 Description

Short technical summary and product information.

The DS1305 is a Serial Alarm Real Time Clock (RTC) that provides seconds, minutes, hours, date, month, and year information. It includes leap year compensation valid up to 2100 and operates in either 24-hour or 12-hour format with an AM/PM indicator.

 

This RTC offers 96 bytes of non-volatile RAM for data storage. It features two time-of-day alarms that are programmable on a combination of seconds, minutes, hours, and day of the week. The serial interface supports both Motorola Serial Peripheral Interface (SPI) and standard 3-wire configurations.

 

The DS1305 operates from a voltage range of 2.5V to 5.5V, with an optional full operation range of 2.0V to 5.5V. It is available in space-efficient 20-pin TSSOP and 16-pin DIP packages. An optional industrial temperature range of -40°C to +85°C is also available.

 

Dual power supply pins are provided for primary and backup power supplies, with an optional trickle charge output to the backup supply. The VBAT pin allows the device to be backed up by a non-rechargeable battery.

DS1305 Quick Information

Product Type: Real Time Clock
Canonical Name: DS1305 Serial Alarm Real Time Clock
Subcategory: Clock/Timing

DS1305 Compliance

RoHS Status: RoHS Compliant
Moisture Sensitivity Level (MSL): 1 Unlimited
REACH Status: REACH Unaffected

DS1305 Estimated Pricing

Qty Low High
1+ $7.69 $7.69

Estimated market price range - modelled values for guidance only, not live distributor offers.

DS1305 Features

  • Counts seconds, minutes, hours, date, month, and year.
  • Includes 96 bytes of non-volatile RAM.
  • Supports SPI and 3-wire serial interfaces.
  • Operates from 2.5V to 5.5V.
  • Available in DIP and TSSOP packages.

DS1305 Applications

  • Ideal for battery-backed timekeeping.
  • Suitable for systems requiring alarms.
  • Used in embedded systems.
  • Applications needing NV RAM storage.

DS1305 FAQs

7 frequently asked questions generated from this part’s specifications.
What is the operating voltage of the DS1305?

The DS1305 operates at 2.5V with an optional 2.0V to 5.5V mode.

What interface does the DS1305 use?

It supports SPI and standard 3-wire serial interfaces.

How much non-volatile RAM does the DS1305 have?

96 bytes of non-volatile RAM for data storage.

How many alarms does the DS1305 support?

Two time-of-day alarms are available.

What crystal frequency does the DS1305 require?

A 32.768 kHz crystal is required for timekeeping.

What packages are available for the DS1305?

It is available in a 20-pin TSSOP or 16-pin DIP package.

What is the operating temperature range of the DS1305?

An optional industrial temperature range of -40°C to +85°C is available.

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