Maxim > Products > Real-Time Clocks (RTCs) > DS1307

DS1307

64 x 8, Serial, I²C Real-Time Clock

Status

Part Number	Status
DS1307	Active: In Production. But some versions of the family are subject to Last Time Buy. See Ordering Information.

Description

The DS1307 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially through an I²C, bidirectional bus. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with AM/PM indicator. The DS1307 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply. Timekeeping operation continues while the part operates from the backup supply.

Data Sheet

Download	Rev 5	(PDF, 148kB)
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Key Features

Real-Time Clock (RTC) Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the week, and Year with Leap-Year Compensation Valid Up to 2100
56-Byte, Battery-Backed, General-Purpose RAM with Unlimited Writes
I²C Serial Interface
Programmable Square-Wave Output Signal
Automatic Power-Fail Detect and Switch Circuitry
Consumes Less than 500nA in Battery-Backup Mode with Oscillator Running
Optional Industrial Temperature Range: -40°C to +85°C
Available in 8-Pin Plastic DIP or SO
Underwriters Laboratories (UL) Recognized

Key Specifications:

Timekeeping & Real-Time Clocks

Part Number

Interface

V_SUPPLY
(V)

Time Keeping Current
(nA)

C_L
(pF)

Memory Type

Memory Size
(Bytes)

Time of Day Alarms

Budgetary
Price

typ

See Notes

DS1307

I²C

300

12.5

NV SRAM

$1.35 @1k

See All Timekeeping & Real-Time Clocks (86)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Technical Documents

App Note 58 Crystal Considerations with Maxim Real-Time Clocks (RTCs)

App Note 95 Interfacing the DS1307 with an 8051-Compatible Microcontroller

App Note 504 Design Considerations for Maxim Real-Time Clocks

App Note 505 Lithium Coin-Cell Batteries: Predicting an Application Lifetime

App Note 701 Using the DS32kHz with Dallas Real-Time Clocks

App Note 3816 Selecting a Backup Source for Real-Time Clocks

App Note 3921 Using a DS1307 with a PIC Microcontroller

App Note 4247 Oscillator Design Considerations for Low-Current Applications

Tutorial 5413 State Machine Logic in Binary-Coded Decimal (BCD)-Formatted Real-Time Clocks

Product Guides

Real-Time Clocks (PDF)

Reliability Reports

Reliability Report:	DS1307.pdf
Underwriters Laboratories (UL) Recognized

Ordering Information

Filters:

Part Number

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1307			Last Time Buy	DS1307+	PDIP(N);8 pin;79.7 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1307+			Active		PDIP(N);8 pin;79.7 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307N			Active		PDIP(N);8 pin;79.7 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1307N+			Active		PDIP(N);8 pin;79.7 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307Z			Active		SOIC(N);8 pin;30.9 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1307Z+			Active		SOIC(N);8 pin;30.9 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307Z+T&R			Active		SOIC(N);8 pin;30.9 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307Z+T&R/C01			Active		SOIC(N);8 pin;30.9 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307Z/T&R			Active		SOIC(N);8 pin;30.9 mm² Package Details	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
DS1307ZN			Active		SOIC(N);8 pin;30.9 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1307ZN+			Active		SOIC(N);8 pin;30.9 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307ZN+T&R			Active		SOIC(N);8 pin;30.9 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307ZN+T&R/C02			Active		SOIC(N);8 pin;30.9 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1307ZN/T&R			Active		SOIC(N);8 pin;30.9 mm² Package Details	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maximintegrated.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Information Index

Overview		Design Resources		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Technical Documents Evaluation Kits Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 5; 2008-10-16
This page last modified: 2011-02-15