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DS1340 Datasheet

  • DS1340

  • 2-Wire RTC with Trickle Charger

  • Maxim   Maxim

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Rev 2; 12/04
I
2
C RTC with Trickle Charger
General Description
The DS1340 is a real-time clock (RTC)/calendar that is
pin compatible and functionally equivalent to the ST
M41T00, including the software clock calibration. The
device additionally provides trickle-charge capability
on the V
BACKUP
pin, a lower timekeeping voltage, and
an oscillator STOP flag. Block access of the register
map is identical to the ST device. Two additional regis-
ters, which are accessed individually, are required for
the trickle charger and flag. The clock/calendar pro-
vides seconds, minutes, hours, day, date, month, and
year information. A built-in power-sense circuit detects
power failures and automatically switches to the back-
up supply. The device is programmed serially through
an I
2
C
TM
bidirectional bus.
Features
鈾?/div>
Enhanced Second Source for the ST M41T00
鈾?/div>
Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)
鈾?/div>
Fast (400kHz) I
2
C Interface
鈾?/div>
Software Clock Calibration
鈾?/div>
RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
鈾?/div>
Automatic Power-Fail Detect and Switch Circuitry
鈾?/div>
Trickle-Charge Capability
鈾?/div>
Low Timekeeping Voltage Down to 1.3V
鈾?/div>
Three Operating Voltage Ranges (1.8V, 3V, and 3.3V)
鈾?/div>
Oscillator Stop Flag
鈾?/div>
Available in 8-Pin 碌SOP or SO Packages
鈾?/div>
Underwriters Laboratory (UL) Recognized
DS1340
Applications
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
Ordering Information
PART
DS1340Z-18
DS1340Z-3
DS1340Z-33
TEMP RANGE
PIN-PACKAGE
TOP
MARK
D1340-18
DS1340-3
D1340-33
1340
A1-18
1340
A1-3
1340
A1-33
1340C-18
1340C-3
1340C-33
D1340-18
DS1340-3
D1340-33
1340
A1-18
1340
A1-3
1340
A1-33
1340C-18
1340C-3
1340C-33
-40擄C to +85擄C 8 SO (0.150in)
-40擄C to +85擄C 8 SO (0.150in)
-40擄C to +85擄C 8 SO (0.150in)
-40擄C to +85擄C 8 碌SOP
-40擄C to +85擄C 8 碌SOP
-40擄C to +85擄C 8 碌SOP
-40擄C to +85擄C 16 SO
-40擄C to +85擄C 16 SO
-40擄C to +85擄C 16 SO
-40擄C to +85擄C 8 SO (0.150in)
-40擄C to +85擄C 8 SO (0.150in)
-40擄C to +85擄C 8 SO (0.150in)
-40擄C to +85擄C 8 碌SOP
-40擄C to +85擄C 8 碌SOP
-40擄C to +85擄C 8 碌SOP
-40擄C to +85擄C 16 SO
-40擄C to +85擄C 16 SO
-40擄C to +85擄C 16 SO
Typical Operating Circuit
V
CC
CRYSTAL
V
CC
RPU
RPU
1
X1
6 SCL
CPU
5 SDA
RPU = t
R
/ C
B
2
X2
8
V
CC
7
FT/OUT
DS1340U-18
DS1340U-3
V
CC
DS1340U-33
DS1340C-18
DS1340C-3
DS1340C-33
DS1340Z-18+
DS1340Z-3+
DS1340Z-33+
DS1340U-18+
DS1340U-3+
DS1340U-33+
DS1340
V
BACKUP
GND
4
3
I
2
C is a trademark of Philips Corp. Purchase of I
2
C compo-
nents from 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.
DS1340C-18+
DS1340C-3+
DS1340C-33+
Note: A "+" in the part number and a "+" anywhere on the top
mark indicates a lead-free device.
Pin Configurations appear at end of data sheet.
______________________________________________
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.

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