The low-voltage serial-peripheral interface (SPI™)
DS1390/DS1391 and the low-voltage 3-wire DS1392/
DS1393 real-time clocks (RTCs) are clocks/calendars
that provide hundredths of a second, seconds, min-
utes, hours, day, date, month, and year information.
The date at the end of the month is automatically
adjusted for months with fewer than 31 days, including
corrections for leap year. The clock operates in either
the 24-hour or 12-hour format with an AM/PM indicator.
One programmable time-of-day alarm is provided. A
temperature-compensated voltage reference monitors
the status of V
CC
and automatically switches to the
backup supply if a power failure is detected. On the
DS1390, a single open-drain output provides a CPU
interrupt or a square wave at one of four selectable fre-
quencies. The DS1391 replaces the SQW/INT pin with a
RST
output/debounced input.
The DS1390 and DS1391 are programmed serially
through an SPI-compatible, bidirectional bus. The
DS1392 and DS1393 communicate over a 3-wire serial
bus, and the extra pin is used for either a separate
interrupt pin or a
RST
output/debounced input.
All four devices are available in a 10-pin µSOP package,
and are rated over the industrial temperature range.
Features
♦
Real-Time Clock Counts Hundredths of Seconds,
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap-Year Compensation Valid Up to
2100
♦
Output Pin Configurable as Interrupt or Square
Wave with Programmable Frequency of
32.768kHz, 8.192kHz, 4.096kHz, or 1Hz
(DS1390/DS1393 Only)
♦
One Time-of-Day Alarm
♦
Power-Fail Detect and Switch Circuitry
♦
Reset Output/Debounced Input (DS1391/DS1393)
♦
Separate SQW and INT Output (DS1392)
♦
Trickle-Charge Capability
♦
SPI Supports Modes 1 and 3 (DS1390/DS1391)
♦
3-Wire Interface (DS1392/DS1393)
♦
4MHz at 3.0V and 3.3V
♦
1MHz at 1.8V
♦
Three Operating Voltages: 1.8V ±5%, 3.0V ±10%,
and 2.97 to 5.5V
♦
Industrial Temperature Range: -40°C to +85°C
♦
Underwriters Laboratory (UL) Recognized
DS1390/DS1391/DS1392/DS1393
Applications
Hand-Held Devices
GPS/Telematics Devices
Embedded Time Stamping
Medical Devices
PART
Ordering Information
PIN-
TOP MARK
PACKAGE
DS1390U-18
-40°C to +85°C 10 µSOP
DS1390 rr-18
DS1390U-3
-40°C to +85°C 10 µSOP
DS1390 rr-3
DS1390U-33
-40°C to +85°C 10 µSOP
DS1390 rr-33
DS1391U-18
-40°C to +85°C 10 µSOP
DS1391 rr-18
DS1391U-3
-40°C to +85°C 10 µSOP
DS1391 rr-3
DS1391U-33
-40°C to +85°C 10 µSOP
DS1391 rr-33
DS1392U-18
-40°C to +85°C 10 µSOP
DS1393 rr-18
DS1392U-3
-40°C to +85°C 10 µSOP
DS1392 rr-3
DS1392U-33
-40°C to +85°C 10 µSOP
DS1392 rr-33
DS1393U-18
-40°C to +85°C 10 µSOP
DS1393 rr-18
DS1393U-3
-40°C to +85°C 10 µSOP
DS1393 rr-3
DS1393U-33
-40°C to +85°C 10 µSOP
DS1393 rr-33
Where “rr” is a revision code on the second line of the top mark.
TEMP RANGE
Typical Operating Circuits and Pin Configurations appear at
end of the data sheet.
SPI is a trademark of Motorola, Inc.
______________________________________________
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.
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
DS1390/DS1391/DS1392/DS1393
ABSOLUTE MAXIMUM RATINGS
Voltage Range on V
CC
Pin Relative to Ground .....-0.3V to +6.0V
Voltage Range on Inputs Relative
to Ground ...............................................-0.3V to (V
CC
+ 0.3V)
Operating Temperature Range ...........................-40°C
to +85°C
Storage Temperature Range .............................-55°C to +125°C
Soldering Temperature .......................................See IPC/JEDEC
J-STD-020A Specification
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED DC OPERATING CONDITIONS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at nominal supply voltage and T
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