Rev 4; 3/06
2
I C RTC with Trickle Charger
General Description
Features
♦ Enhanced Second Source for the ST M41T00
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
♦ Available in a Surface-Mount Package with an
Integrated Crystal (DS1340C)
2
♦ Fast (400kHz) I C Interface
on the V
pin, a lower timekeeping voltage, and
BACKUP
♦ Software Clock Calibration
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. Reads and writes are inhibited while the
clock continues to run. The device is programmed seri-
♦ RTC Counts Seconds, Minutes, Hours, Day, Date,
Month, and Year
♦ Automatic Power-Fail Detect and Switch Circuitry
♦ Trickle-Charge Capability
♦ Low Timekeeping Voltage Down to 1.3V
♦ Three Operating Voltage Ranges (1.8V, 3V, and 3.3V)
♦ Oscillator Stop Flag
ally through an I C* bidirectional bus.
2
♦ Available in 8-Pin µSOP or SO Packages
♦ Underwriters Laboratory (UL) Recognized
Applications
Ordering Information
Portable Instruments
Point-of-Sale Equipment
Medical Equipment
Telecommunications
TOP
MARK
PART
TEMP RANGE PIN-PACKAGE
†
DS1340Z-18
DS1340Z-3
DS1340Z-33
DS1340U-18
DS1340U-3
DS1340U-33
DS1340C-18
DS1340C-3
DS1340C-33
-40°C to +85°C 8 SO (0.150in) D1340-18
-40°C to +85°C 8 SO (0.150in) DS1340-3
-40°C to +85°C 8 SO (0.150in) D1340-33
-40°C to +85°C 8 µSOP
-40°C to +85°C 8 µSOP
-40°C to +85°C 8 µSOP
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
-40°C to +85°C 16 SO
1340A1-18
1340A1-3
1340A1-33
1340C-18
1340C-3
Typical Operating Circuit
V
V
CC
CC
CRYSTAL
1340C-33
V
CC
C1
R
PU
R
PU
1
2
8
DS1340Z-18+ -40°C to +85°C 8 SO (0.150in) D1340-18
DS1340Z-3+ -40°C to +85°C 8 SO (0.150in) DS1340-3
DS1340Z-33+ -40°C to +85°C 8 SO (0.150in) D1340-33
X1
X2
V
CC
7
3
6
5
SCL
FT/OUT
CPU
DS1340U-18+ -40°C to +85°C 8 µSOP
DS1340U-3+ -40°C to +85°C 8 µSOP
1340A1-18
1340A1-3
1340A1-33
1340C-18
1340C-3
DS1340
SDA
V
BACKUP
DS1340U-33+ -40°C to +85°C 8 µSOP
DS1340C-18# -40°C to +85°C 16 SO
GND
4
R
PU
= t / C
R B
DS1340C-3#
-40°C to +85°C 16 SO
DS1340C-33# -40°C to +85°C 16 SO
1340C-33
+ Denotes a lead-free/RoHS-compliant device.
# 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 lead-free device.
A "#" denotes a RoHS-compliant device.
2
*Purchase of I C components from Maxim Integrated Products,
Inc., or one of its sublicensed Associated Companies, conveys
2
a license under the Philips I C Patent Rights to use these com-
2
ponents in an I C system, provided that the system conforms to
2
the I C Standard Specification as defined by Philips.
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’s website at www.maxim-ic.com.
5秒后页面跳转
解析光耦仿真器：升级光耦合器技术的必要性
英伟达新一代Blackwell GPU过热问题致交付延迟
国产厂商思特威CMOS图像传感器芯片单月出货超1亿颗，技术创新引领行业发展
台积电5nm和3nm产能利用率达100%，半导体行业景气度持续攀升
微信公众号
抖音公众号
浙公网安备 33010502006866号 浙ICP备10014259号-119
营业执照ICP证
数据手册
如果您发现信息不准确，
