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DS1374U-33 Datasheet

  • DS1374U-33

  • I2C, 32-Bit Binary Counter Watchdog RTC with Trickle Charger...

  • 15頁

  • MAXIM   MAXIM

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Rev 1; 9/04
I
2
C, 32-Bit Binary Counter Watchdog RTC with
Trickle Charger and Reset Input/Output
General Description
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
CC
to
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
2
C鈩?serial interface.
Features
鈾?/div>
32-Bit Binary Counter
鈾?/div>
Second Binary Counter Provides Time-of-Day
Alarm, Watchdog Timer, or NV RAM
鈾?/div>
Separate Square-Wave and Interrupt Output Pins
鈾?/div>
I
2
C Serial Interface
鈾?/div>
Automatic Power-Fail Detect and Switch Circuitry
鈾?/div>
Single-Pin Pushbutton Reset Input/Open-Drain
Reset Output
鈾?/div>
Low-Voltage Operation
鈾?/div>
Trickle-Charge Capability
鈾?/div>
-40擄C to +85擄C Operating Temperature Range
鈾?/div>
10-Pin 碌SOP, 16-Pin SO
鈾?/div>
Available in a Surface-Mount Package with an
Integrated Crystal (DS1374C)
鈾?/div>
Underwriters Laboratory (UL) Recognized
DS1374
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
Typical Operating Circuit
PART
V
CC
RPU = t
r
/C
B
V
CC
CRYSTAL
Ordering Information
TEMP RANGE
PIN-
PACKAGE
TOP MARK
DS1374-18
DS1374-3
DS1374-33
DS1374U-18
DS1374U-3
DS1374U-33
X1
SCL
X2
V
CC
SQW
-40擄C to +85擄C 10 碌SOP
-40擄C to +85擄C 10 碌SOP
-40擄C to +85擄C 10 碌SOP
RPU RPU
V
CC
DS1374C-18
DS1374C-3
DS1374C-33
-40擄C to +85擄C 16 SO, 0.300" DS1374C-18
-40擄C to +85擄C 16 SO, 0.300" DS1374C-3
-40擄C to +85擄C 16 SO, 0.300" DS1374C-33
CPU
INT
SDA
INT
DS1374
PRIMARY
BATTERY,
RECHARGEABLE
BATTERY, OR
SUPER CAPACITOR
RST
N.O.
PUSHBUTTON
RESET
RST
V
BACKUP
GND
Pin Configurations appear at the end of the data sheet.
I
2
C is a trademark of Philips Corp. Purchase of I
2
C compo-
nents of Maxim Integrated Products, Inc., or one of its subli-
censed Associated Companies, conveys a license under the
Philips I
2
C Patent Rights to use these components in an I
2
C
system, provided that the system conforms to the I
2
C 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鈥檚 website at www.maxim-ic.com.

DS1374U-33 產(chǎn)品屬性

  • Maxim Integrated Products

  • Tube

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