DS1374C-33# Maxim Integrated Products, DS1374C-33# Datasheet

IC RTC I2C W/CHARGER 16-SOIC

DS1374C-33#

Manufacturer Part Number
DS1374C-33#
Description
IC RTC I2C W/CHARGER 16-SOIC
Manufacturer
Maxim Integrated Products
Type
Watchdog Timer/Trickle Chargerr
Datasheet

Specifications of DS1374C-33#

Time Format
Binary
Date Format
Binary
Interface
I²C, 2-Wire Serial
Voltage - Supply
2.97 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SOIC (0.300", 7.5mm Width)
Function
Clock/Calendar/Elapsed Time Counter/Watchdog Timekeeper
Supply Voltage (max)
5.5 V
Supply Voltage (min)
2.97 V
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Rtc Bus Interface
Serial (2-Wire, I2C)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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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
19-5484; Rev 4; 8/10
Pin Configurations appear at the end of the 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.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
** A "#" anywhere on the top mark denotes a RoHS-compliant package. A “+” anywhere on the top mark denotes a lead(Pb)-free
package.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
DS1374C-18#
DS1374C-3#
DS1374C-33#
DS1374U-18+
DS1374U-3+
DS1374U-33+
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
PART
I
2
C, 32-Bit Binary Counter Watchdog RTC with
General Description
Trickle Charger and Reset Input/Output
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
2
C serial interface.
Applications
______________________________________________ Maxim Integrated Products
CC
VOLTAGE (V)
to
1.8
3.0
3.3
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 Laboratories (UL) Recognized
Alarm, Watchdog Timer, or NV RAM
Reset Output
Integrated Crystal (DS1374C)
2
C Serial Interface
RPU = t
CPU
V
CC
RST
INT
RPU
r
/C
PUSHBUTTON
PIN-PACKAGE
16 SO (300 mils)
16 SO (300 mils)
16 SO (300 mils)
10 μSOP
10 μSOP
10 μSOP
B
RPU
RESET
N.O.
V
CC
Typical Operating Circuit
X1
SCL
SDA
RST
INT
Ordering Information
CRYSTAL
X2
DS1374
GND
V
BACKUP
TOP MARK**
DS1374C-18
DS1374C-3
DS1374C-33
DS1374-18
DS1374-3
DS1374-33
V
V
SQW
CC
CC
Features
PRIMARY
BATTERY,
RECHARGEABLE
BATTERY, OR
SUPER CAPACITOR
1

Related parts for DS1374C-33#

DS1374C-33# Summary of contents

Page 1

... Telecommunications Pin Configurations appear at the end of the data sheet. PART TEMP RANGE DS1374C-18# -40°C to +85°C DS1374C-3# -40°C to +85°C DS1374C-33# -40°C to +85°C DS1374U-18+ -40°C to +85°C DS1374U-3+ -40°C to +85°C DS1374U-33+ -40°C to +85°C # 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 ...

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 or SCL Relative to Ground ....................................-0.3V to ...

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 2) 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 2) (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 Trickle 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 Trickle 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 Trickle Charger and Reset Input/Output BIT 7 BIT 6 BIT 5 TCS3 TCS2 TCS1 SELECT NOTE: ONLY 1010b ENABLES CHARGER V CC Figure 7. Programmable Trickle Charger SDA ...

Page 15

I C, 32-Bit Binary Counter Watchdog RTC with Trickle 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. 16 ____________________________________________________________________ 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

... RoHS status. PACKAGE TYPE 16 SO (0.300”) 10 µSOP (3.0mm) ____________________________________________________________________ Pin Configurations 1 16 SDA 2 15 GND 3 14 RST BACKUP DS1374C N.C. N. (0.300") Package Information PACKAGE OUTLINE LAND CODE NO. PATTERN NO. ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc ...

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