Maxim > Products > Real-Time Clocks (RTCs) > DS1374, DS1374C, DS1374U
Maxim > Products > Supervisors, Voltage Monitors, Sequencers > DS1374, DS1374C, DS1374U

DS1374, DS1374C, DS1374U

I²C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output

Elapsed Time Counter Provides Power-On Reset, Watchdog or Alarm, and Square Wave

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
DS1374	Active: In Production.
DS1374C	Active: In Production. See Ordering Information for details.
DS1374U	Active: In Production. See Ordering Information for details.

Description

The DS1374 is a 32-bit binary counter designed to continuously count time in seconds. An additional counter generates a periodic alarm or serves as a watchdog timer. If disabled, this counter can be used as 3 bytes of nonvolatile (NV) RAM. Separate output pins are provided for an interrupt and a square wave at one of four selectable frequencies. A precision temperature-compensated reference and comparator circuit monitor the status of V_CC to detect power failures, provide a reset output, and automatically switch to the backup supply when necessary.

Additionally, the reset pin is monitored as a pushbutton input for externally generating a reset. The device is programmed serially through an I²C serial interface.

Data Sheet

Download	Rev 4	(PDF, 272kB)
E-Mail

Key Features

32-Bit Binary Counter
Second Binary Counter Provides Time-of-Day Alarm, Watchdog Timer, or NV RAM
Separate Square-Wave and Interrupt Output Pins
I²C Serial Interface
Automatic Power-Fail Detect and Switch Circuitry
Single-Pin Pushbutton Reset Input/Open-Drain Reset Output
Low-Voltage Operation
Trickle-Charge Capability
-40°C to +85°C Operating Temperature Range
10-Pin µSOP, 16-Pin SO
Available in a Surface-Mount Package with an Integrated Crystal (DS1374C)
Underwriters Laboratories (UL) Recognized

Applications/Uses

Medical Equipment
Point-of-Sale Equipment
Portable Instrumentation
Telecommunications

Key Specifications:

Timekeeping & Real-Time Clocks

Part Number

Functions

Date/ Time Format

Interface

V_SUPPLY
(V)

Time Keeping Current
(nA)

C_L
(pF)

Memory Type

Time of Day Alarms

Integrated XTAL

Budgetary Price

hh = sec/100

typ

See Notes

DS1374

Elapsed Time Counter

Watchdog Timekeeper

Binary

I²C

1.8

3.3

400

None

$1.31 @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

Application Notes

Application Note 58		Crystal Considerations with Maxim Real-Time Clocks (RTCs)
Application Note 504		Design Considerations for Maxim Real-Time Clocks
Application Note 505		Lithium Coin-Cell Batteries: Predicting an Application Lifetime
Application Note 511		Using the DS1672 Low-Voltage Serial Timekeeping IC
Application Note 512		Using the Watchdog/Alarm Counter in the DS1371 and DS1374 Real-Time Clocks
Application Note 517		DS1371/DS1372/DS1374 32-Bit Binary Counter Time Conversion
Application Note 701		Using the DS32kHz with Dallas Real-Time Clocks
Application Note 3572		FAQ About the Integrated-Crystal Package Option
Application Note 3816		Selecting a Backup Source for Real-Time Clocks
Application Note 4247		Oscillator Design Considerations for Low-Current Applications

Product Guides

Real-Time Clocks (PDF)

Reliability Reports

Reliability Report:	DS1374.pdf
Request Reliability Report for:
Underwriters Laboratories (UL) Recognized

Software/Models

none

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
DS1374C-18			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1374C-18#			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1374C-3			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1374C-3#			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1374C-3#T&R			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1374C-33		N/A	No Longer Available	DS1374C-33#	SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1374C-33#			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1374C-33#T&R			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16#H2*	-40°C to +85°C	RoHS/Lead-Free: RoHS Qualified Materials Analysis
DS1374C-33/T&R			Active		SOIC(W);16 pin;110.6 mm² Outline Drawing:21-0042 (PDF) Land Pattern: 90-0107 (PDF) Use pkgcode/variation: W16-H2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1374U-18			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-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
DS1374U-18+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1374U-3		N/A	No Longer Available	DS1374U-3+	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1374U-3+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1374U-3+T&R			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1374U-33			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
DS1374U-33+			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1374U-33+T&R			Active		µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1374U-33/T&R		N/A	No Longer Available	DS1374U-33+T&R	µMAX;10 pin;15.4 mm² Outline Drawing:21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.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.

Similar Products by Function

DS1672	I²C 32-Bit Binary Counter RTC
DS1371	I²C, 32-Bit Binary Counter Watchdog Clock
See All Timekeeping & Real-Time Clocks (96 Products)

Similar Products by Application

Broadcast TV and Radio > Real-Time Clocks

Cable Modems and CATV > Real-Time Clocks

Cable Modems and CATV > Watchdog

Transport Nodes, Access Nodes, Add/Drop Multiplexers, and Digital Cross-Connects > Battery Backup

More Information

New Product Press Release	[ 2003-03-28 ]
RTC Calculator Super Capacitor Calculator

Didn't Find What You Need?

Next Day Product Selection Assistance from Applications Engineers
Parametric Search
Applications Help

Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides 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

Document Ref.: 19-5484 Rev 4; 2010-08-30
This page last modified: 2010-08-31