DS1374U-33

DS1374U-33 Datasheet

DS1374

Part	Datasheet
DS1374U-33	DS1374U-33 (pdf)

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DS1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output 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 VCC 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. Portable Instruments Point-of-Sale Equipment Medical Equipment Telecommunications 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 Laboratory UL Recognized Typical Operating Circuit RPU = tr/CB VCC RPU RST N.O. PUSHBUTTON RESET VCC CRYSTAL X1 X2 SQW SCL DS1374 VBACKUP GND PRIMARY BATTERY, RECHARGEABLE BATTERY, OR SUPER CAPACITOR Ordering Information PART DS1374U-18 DS1374U-3 DS1374U-33 DS1374C-18 DS1374C-3 DS1374C-33 TEMP RANGE PINPACKAGE TOP MARK -40°C to +85°C 10 µSOP DS1374-18 -40°C to +85°C 10 µSOP DS1374-3 -40°C to +85°C 10 µSOP DS1374-33 -40°C to +85°C 16 SO, DS1374C-18 -40°C to +85°C 16 SO, DS1374C-3 -40°C to +85°C 16 SO, DS1374C-33 Pin Configurations appear at the end of the data sheet. I2C is a trademark of Philips Corp. Purchase of I2C compo- nents of Maxim Integrated Products, Inc., or one of its subli- censed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at DS1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Pin Relative to Ground .....-0.3V to +6.0V Voltage Range on SDA, SCL, and WDS Relative to Ground to VCC + 0.3V Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature Range ........................See the Handling, PC Board Layout, and Assembly section. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED DC OPERATING CONDITIONS VCC = VCC MIN to VCC MAX, TA = -40°C to +85°C, unless otherwise noted. Note 1 PARAMETER Supply Voltage Notes 2, 3 Input Logic 1 Input Logic 0 Pullup Resistor Voltage INT, SQW, SDA, SCL , VCC = 0V Power-Fail Voltage Note 2 Backup Supply Voltage Notes 2, 3, 4 SYMBOL VCC VIH DS1374-33 DS1374-3 DS1374-18 Note 2 Note 2 CONDITIONS Note 2 DS1374-33 DS1374-3 DS1374-18 VBACKUP DS1374-33 DS1374-3 MIN TYP MAX x VCC VCC + UNITS V DS1374 I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output DC ELECTRICAL CHARACTERISTICS VCC = VCC MIN to VCC MAX, TA = -40°C to +85°C, unless otherwise noted. Note 1 PARAMETER Trickle-Charge Current-Limiting Resistors Input Leakage I/O Leakage RST Pin I/O Leakage SDA Logic 0 Output VOL = 0.4V RST, SQW, and INT Logic 0 Outputs Note 11 Active Supply Current Notes 11, 12 Standby Current Notes 11, 13 SYMBOL R1 R2 R3 ILI ILO ILORST IOLSDA

PDF Datasheet Preview

DS1374

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

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 VCC 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.

Portable Instruments Point-of-Sale Equipment Medical Equipment Telecommunications
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 Laboratory UL Recognized

Typical Operating Circuit

RPU = tr/CB VCC RPU

RST N.O.

PUSHBUTTON RESET

VCC CRYSTAL

X1 X2

SQW SCL

DS1374

VBACKUP GND

PRIMARY BATTERY, RECHARGEABLE BATTERY, OR SUPER CAPACITOR
Ordering Information

PART

DS1374U-18 DS1374U-3 DS1374U-33 DS1374C-18 DS1374C-3 DS1374C-33

TEMP RANGE

PINPACKAGE

TOP MARK
-40°C to +85°C 10 µSOP

DS1374-18
-40°C to +85°C 10 µSOP

DS1374-3
-40°C to +85°C 10 µSOP

DS1374-33
-40°C to +85°C 16 SO, DS1374C-18
-40°C to +85°C 16 SO, DS1374C-3
-40°C to +85°C 16 SO, DS1374C-33

Pin Configurations appear at the end of the data sheet.

I2C is a trademark of Philips Corp. Purchase of I2C compo-
nents of Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard

Specification as defined by Philips.

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at

DS1374

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

ABSOLUTE MAXIMUM RATINGS

Voltage Range on VCC Pin Relative to Ground .....-0.3V to +6.0V Voltage Range on SDA, SCL, and WDS

Relative to Ground to VCC + 0.3V Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-55°C to +125°C Soldering Temperature Range ........................See the Handling,

PC Board Layout, and Assembly section.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

RECOMMENDED DC OPERATING CONDITIONS

VCC = VCC MIN to VCC MAX, TA = -40°C to +85°C, unless otherwise noted. Note 1

PARAMETER

Supply Voltage Notes 2, 3

Input Logic 1 Input Logic 0 Pullup Resistor Voltage INT, SQW, SDA, SCL , VCC = 0V

Power-Fail Voltage Note 2

Backup Supply Voltage Notes 2, 3, 4

SYMBOL VCC VIH

DS1374-33 DS1374-3 DS1374-18 Note 2

Note 2

CONDITIONS

Note 2

DS1374-33

DS1374-3

DS1374-18

VBACKUP

DS1374-33 DS1374-3

MIN TYP MAX
x VCC

VCC +

UNITS V

DS1374

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

DC ELECTRICAL CHARACTERISTICS

VCC = VCC MIN to VCC MAX, TA = -40°C to +85°C, unless otherwise noted. Note 1

PARAMETER

Trickle-Charge Current-Limiting Resistors

Input Leakage I/O Leakage RST Pin I/O Leakage SDA Logic 0 Output VOL = 0.4V RST, SQW, and INT Logic 0 Outputs Note 11

Active Supply Current Notes 11, 12

Standby Current Notes 11, 13

SYMBOL R1 R2 R3 ILI ILO

ILORST IOLSDA

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Datasheet ID: DS1374U-33 647157