DS1374C-18- MAXIM [Maxim Integrated Products], DS1374C-18- Datasheet

DS1374C-18-

Manufacturer Part Number

DS1374C-18-

Description

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

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.DS1374C-18-.pdf (17 pages)

Current page: 1 of 17
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The DS1374 is a 32-bit binary counter designed to contin-

uously count time in seconds. An additional counter gen-

erates a periodic alarm or serves as a watchdog timer. If

disabled, this counter can be used as 3 bytes of non-

volatile (NV) RAM. Separate output pins are provided for

an interrupt and a square wave at one of four selectable

frequencies. A precision temperature-compensated refer-

ence and comparator circuit monitor the status of V

detect power failures, provide a reset output, and auto-

matically 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 pro-

grammed serially through an I

Rev 3; 1/06

*Purchase of I

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

ponents in an I

to the I

Pin Configurations appear at the end of the data sheet.

Ordering Information continued at end of data sheet.

#Denotes a RoHS-compliant device that may include lead that is exempt under RoHS requirements. The lead finish is JESD97 category

e3, and is compatible with both lead-based and lead-free soldering processes.

**A "#" anywhere on the top mark denotes a RoHS-compliant package.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

DS1374C-18

DS1374C-18#

DS1374C-3

DS1374C-3#

DS1374C-33

DS1374C-33#

DS1374C-33/T&R

Portable Instruments

Point-of-Sale Equipment

Medical Equipment

Telecommunications

C Standard Specification as defined by Philips.

PART

C components of Maxim Integrated Products,

C system, provided that the system conforms

C, 32-Bit Binary Counter Watchdog RTC with

General Description

C Patent Rights to use these com-

-40°C to +85°C

TEMP RANGE

Trickle Charger and Reset Input/Output

C* serial interface.

Applications

______________________________________________ Maxim Integrated Products

VOLTAGE (V)

1.8

3.0

3.3

♦ 32-Bit Binary Counter

♦ Second Binary Counter Provides Time-of-Day

♦ Separate Square-Wave and Interrupt Output Pins

♦ I

♦ Automatic Power-Fail Detect and Switch Circuitry

♦ Single-Pin Pushbutton Reset Input/Open-Drain

♦ 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

♦ Underwriters Laboratory (UL) Recognized

Alarm, Watchdog Timer, or NV RAM

Reset Output

Integrated Crystal (DS1374C)

PIN-PACKAGE

16 SO (300 mils)

16 SO (300 mils)/Tape and Reel

C Serial Interface

RPU = t

CPU

RST

INT

RPU

PUSHBUTTON

RPU

RESET

N.O.

Typical Operating Circuit

Ordering Information

SCL

SDA

RST

INT

CRYSTAL

DS1374

GND

BACKUP

SQW

TOP MARK**

DS1374C-18

DS1374C-3

DS1374C-33

Features

PRIMARY

BATTERY,

RECHARGEABLE

BATTERY, OR

SUPER CAPACITOR

Related parts for DS1374C-18-

DS1374C-18- Summary of contents

Page 1

... Single-Pin Pushbutton Reset Input/Open-Drain CC 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 RPU = RPU V ...

Page 2

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output ABSOLUTE MAXIMUM RATINGS Voltage Range on V Pin Relative to Ground .....-0.3V to +6.0V CC Voltage Range on SDA, SCL, and WDS Relative to Ground ....................................-0.3V ...

Page 3

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output DC ELECTRICAL CHARACTERISTICS ( -40°C to +85°C, unless otherwise noted.) (Note 1) CC CC(MIN) CC(MAX) A PARAMETER SYMBOL Trickle-Charge ...

Page 4

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output AC ELECTRICAL CHARACTERISTICS ( -40°C to +85°C, unless otherwise noted.) (Note 1) (Figure 1) CC CC(MIN) CC(MAX) A PARAMETER ...

Page 5

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output POWER-UP/POWER-DOWN CHARACTERISTICS (T = -40°C to +85°C) (Figure 3) A PARAMETER SYMBOL V Detect to Recognize Inputs CC (V Rising Fall Time ...

Page 6

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output SDA t BUF t LOW SCL t HD:STA STOP START 2 Figure 1. Data Transfer Serial Bus RST PB DB Figure 2. Pushbutton ...

Page 7

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output (V = +3.3V +25°C, unless otherwise noted vs. V BAT0SC1 BAT SQUARE-WAVE OFF 550 500 450 400 ...

Page 8

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output PIN NAME µSOP SO Connections for a Standard 32.768kHz Quartz Crystal. The internal oscillator circuitry is designed for operation with a crystal having a specified load ...

Page 9

... Refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks for detailed information The DS1374C integrates a standard 32,768Hz crystal into the package. Typical accuracy at nominal V 25°C is approximately 10ppm. See Application Note 58 is on. CC for information about crystal accuracy vs. temperature. ...

Page 10

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output Power Control The power-control function is provided by a precise, temperature-compensated voltage reference and a comparator circuit that monitors the V device is fully accessible and ...

Page 11

I C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger and Reset Input/Output Watchdog/Alarm Counter The contents of the watchdog/alarm counter, which is a separate 24-bit down counter, are accessed in the address range 04h–06h. When this counter is ...

Page 12

I C, 32-Bit Binary Counter Watchdog RTC with Tickle Charger and Reset Input/Output Bit 7 Bit 6 Bit 5 EOSC WACE WD/ALM Special Purpose Registers The DS1374 has two additional registers (07h–08h) that control the WD/ALM counter and the ...

Page 13

I C, 32-Bit Binary Counter Watchdog RTC with Tickle Charger and Reset Input/Output Bit 7 Bit 6 Bit 5 OSF 0 Status Register (08h) Bit 7/Oscillator Stop Flag (OSF). A logic 1 in this bit indicates that the oscillator ...

Page 14

I C, 32-Bit Binary Counter Watchdog RTC with Tickle Charger and Reset Input/Output BIT 7 BIT 6 BIT 5 TCS3 TCS2 TCS1 TCS0 SELECT NOTE: ONLY 1010b ENABLES CHARGER V CC Figure 7. Programmable Trickle Charger ...

Page 15

I C, 32-Bit Binary Counter Watchdog RTC with Tickle Charger and Reset Input/Output SLAVE REGISTER ADDRESS ADDRESS (n) DATA (n) DATA ( 1101000 0 A XXXXXXXX A XXXXXXXX A XXXXXXXX A XXXXXXXX S - START DATA ...

Page 16

... The DS1374 must receive a not acknowledge to end a read. Handling, PC Board Layout, and The DS1374C package contains a quartz tuning-fork crystal. Pick-and-place equipment can be used, but precautions should be taken to ensure that excessive shocks are avoided. Ultrasonic cleaning should be avoided to prevent damage to the crystal ...

Page 17

I C, 32-Bit Binary Counter Watchdog RTC with Tickle Charger and Reset Input/Output TEMP RANGE PART -40°C to +85°C DS1374U-18 -40°C to +85°C DS1374U-18+ -40°C to +85°C DS1374U-3 -40°C to +85°C DS1374U-3+ -40°C to +85°C DS1374U-3/T&R -40°C to +85°C ...

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