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DS1374C-33+ PDF预览

DS1374C-33+

更新时间： 2024-11-16 13:07:23
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美信 - MAXIM 计数器电源电路电源管理电路光电二极管
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DS1374C-33+ 数据手册

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Rev 3; 1/06  
2
I C, 32-Bit Binary Counter Watchdog RTC with  
Trickle Charger and Reset Input/Output  
General Description  
Features  
♦ 32-Bit Binary Counter  
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-  
♦ Second Binary Counter Provides Time-of-Day  
Alarm, Watchdog Timer, or NV RAM  
♦ Separate Square-Wave and Interrupt Output Pins  
2
♦ I C Serial Interface  
♦ Automatic Power-Fail Detect and Switch Circuitry  
♦ Single-Pin Pushbutton Reset Input/Open-Drain  
ence and comparator circuit monitor the status of V  
to  
CC  
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-  
Reset Output  
♦ Low-Voltage Operation  
♦ Trickle-Charge Capability  
2
grammed serially through an I C* serial interface.  
♦ -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  
Applications  
Portable Instruments  
Point-of-Sale Equipment  
Medical Equipment  
Typical Operating Circuit  
V
CC  
V
CC  
Telecommunications  
RPU = t /C  
r
B
CRYSTAL  
RPU RPU  
V
CC  
V
X1  
X2  
CC  
2
*Purchase of I C components of Maxim Integrated Products,  
SQW  
Inc., or one of its sublicensed Associated Companies, conveys  
SCL  
SDA  
2
a license under the Philips I C Patent Rights to use these com-  
CPU  
2
ponents in an I C system, provided that the system conforms  
DS1374  
2
to the I C Standard Specification as defined by Philips.  
INT  
RST  
INT  
PRIMARY  
BATTERY,  
V
BACKUP  
RST  
RECHARGEABLE  
BATTERY, OR  
SUPER CAPACITOR  
GND  
N.O.  
PUSHBUTTON  
RESET  
Pin Configurations appear at the end of the data sheet.  
Ordering Information  
TEMP RANGE  
-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  
-40°C to +85°C  
PART  
DS1374C-18  
VOLTAGE (V)  
PIN-PACKAGE  
16 SO (300 mils)  
16 SO (300 mils)  
16 SO (300 mils)  
16 SO (300 mils)  
16 SO (300 mils)  
16 SO (300 mils)  
TOP MARK**  
DS1374C-18  
DS1374C-18  
DS1374C-3  
DS1374C-3  
DS1374C-33  
DS1374C-33  
1.8  
1.8  
3.0  
3.0  
3.3  
3.3  
3.3  
DS1374C-18#  
DS1374C-3  
DS1374C-3#  
DS1374C-33  
DS1374C-33#  
DS1374C-33/T&R  
16 SO (300 mils)/Tape and Reel  
DS1374C-33  
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.  
______________________________________________ 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 www.maxim-ic.com.  
1234567...17

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