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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 264kB) Download   E-Mail

Description

The DS1721 digital thermometer and thermostat features ±1°C accuracy over a -10°C to +85°C range. Thermometer data is read out over a 2-wire serial bus in 2's complement format with 9 to 12 bits of resolution (user-programmable). The DS1721 features three address inputs, allowing users to multidrop up to eight DS1721 devices on one bus. The DS1721 offers thermostatic functionality with over-temperature (TH) and under-temperature (TL) user-programmable trip-points stored in on-chip SRAM. The two trip-points provide programmable thermostat hysteresis: the thermostat output is asserted when the measured temperature exceeds TH and it remains active until the temperature falls below TL. The DS1721 is available in 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages. For applications requiring higher precision, the DS1631 provides ±0.5°C accuracy and is functionally compatible with the DS1721.

Key Features		Applications/Uses
±1°C accuracy from -10°C to +85°C Measures temperatures from -55°C to +125°C (-67°F to +257°F) 9- to 12-bit user-configurable resolution Dedicated thermostatic logic output Thermostatic settings are user-programmable Data is transferred over 2-wire/SMBus interface Three address inputs allow up to eight DS1721 to operate on one bus 2.7V to 5.5V supply range 150mil 8-pin SO (DS1721S) and 8-pin µMAX/µSOP (DS1721U) packages		Alarm Systems Fibre Channel Instrumentation Networking

Diagram

Functional Block Diagram

Application Notes

Application Note 127: Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS1621 - DS1721 Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS1721

Design Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report: DS1721.pdf

Software/Models

none

Ordering Information

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. More: SeeFull Data Sheet or Part 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.

Devices: 1-10 of 10

DS1721	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1721S/T&R+W			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1721S			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1721S/T&R			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1721S+			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1721S+T&R			Active	SOIC(N);8 pin;31 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1721U/T&R+W			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1721U			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1721U+			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1721U/T&R			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8-1*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1721U+T&R			Active	µMAX;8 pin;16 mm² Outline Drawing: 21-0036 (PDF) Land Pattern: 90-0092 (PDF) Use pkgcode/variation: U8+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2001-04-30  Temperature Family by Product Type

Related Products

DS1631, DS1631A, DS1731 High-Precision Digital Thermometer and Thermostat

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

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