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DS1305

The Dallas Semiconductor DS1305 is a serial alarm real-time clock. It provides clock and calendar functions with 96 bytes of nonvolatile RAM.

✓ Total Stock: 685 pcs

$ Price Range: $3.00

DS1305 Available from 3 distributors

✓ Authorised

✓ Non-Authorised

Distributor		Stock	Pricing	MOQ	PKG	Lead Time	Date Code	On Order Quantity	On Order Delivery
PROSOFT ELECTRONICS ✓ Non-Authorised Inventory information	494 pcs On Request	494 pcs	On Request	1	On Request	On Request	01+	On Request	On Request
Braun Electronic Components ✓ Non-Authorised Inventory information	141 pcs On Request	141 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request
Hybrid Electronics ✓ Non-Authorised Inventory information	50 pcs On Request	50 pcs	On Request	1	On Request	On Request	On Request	On Request	On Request

DS1305 Specifications Quick View

Most important parameters for selection – full specs in datasheet.

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Category	New Products
Manufacturer Name	Dallas Semiconductor
Interface	SPI, 3-wire
Operating Temperature	-40°C
Operating Voltage	2.5V
RAM Size	96B

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DS1305 Description

Short technical summary and product information.

The DS1305 from Dallas Semiconductor is a serial alarm real-time clock (RTC) that counts seconds, minutes, hours, date, month, day of the week, and year with leap year compensation valid up to 2100. It features 96 bytes of nonvolatile RAM for data storage.

This RTC supports both Motorola SPI and standard 3-wire serial interfaces, offering flexibility in system integration. It operates over a wide voltage range of 2.5V to 5.5V, with an optional 2.0V to 5.5V full operation mode. The device also includes dual power supply pins for primary and backup power, with an optional trickle charge output for the backup supply.

The DS1305 is available in space-efficient 20-pin TSSOP and 16-pin DIP packages. It also offers an optional industrial temperature range of -40°C to +85°C, making it suitable for various environmental conditions.

Key features include two time-of-day alarms programmable on a combination of seconds, minutes, hours, and day of the week, and a burst mode for reading/writing successive addresses in clock/RAM.

DS1305 Quick Information

Product Type: Real Time Clock

Series: DS1305

Canonical Name: DS1305 Serial Alarm Real Time Clock

Subcategory: Real Time Clocks

DS1305 Compliance

RoHS Status: RoHS Compliant

Moisture Sensitivity Level (MSL): 1 Unlimited

REACH Status: REACH Unaffected

Lead Free: Yes

DS1305 Estimated Pricing

Qty	Low	High
1+	$3.00	$3.00

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

DS1305 Features

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

DS1305 Applications

Ideal for timekeeping in embedded systems.
Suitable for data logging applications.
Used in systems requiring alarm functions.
Supports mixed-voltage interface designs.

DS1305 FAQs

5 frequently asked questions generated from this part’s specifications.

What is the operating voltage range for the DS1305?

The DS1305 operates from 2.5V to 5.5V, with an optional 2.0V to 5.5V full operation mode.

What is the operating temperature range for the DS1305?

The industrial temperature range for the DS1305 is -40°C to +85°C.

How much nonvolatile RAM does the DS1305 have?

The DS1305 has 96 bytes of nonvolatile RAM for data storage.

What serial interfaces does the DS1305 support?

The DS1305 supports Motorola SPI and standard 3-wire serial interfaces.

What packages is the DS1305 available in?

The DS1305 is available in TSSOP and DIP packages.