DS1391U-33

DS1391U-33 Datasheet

DS1390/DS1391/DS1392/DS1393

Part	Datasheet
DS1391U-33	DS1391U-33 (pdf)

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DS1390/DS1391/DS1392/DS1393 Low-Voltage SPI/3-Wire RTCs with Trickle Charger 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, minutes, 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 VCC 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 frequencies. 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. 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 to 5.5V Industrial Temperature Range -40°C to +85°C Underwriters Laboratory UL Recognized Hand-Held Devices GPS/Telematics Devices Embedded Time Stamping Medical Devices Typical Operating Circuits and Pin Configurations appear at end of the data sheet. Ordering Information PART TEMP RANGE PINPACKAGE TOP MARK 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 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 Low-Voltage SPI/3-Wire RTCs with Trickle Charger DS1390/DS1391/DS1392/DS1393 ABSOLUTE MAXIMUM RATINGS Voltage Range on VCC Pin Relative to Ground .....-0.3V to +6.0V Voltage Range on Inputs Relative to Ground to VCC + 0.3V Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-55°C to +125°C Soldering Temperature 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 VCC = VCC MIN to VCC MAX , TA = -40°C to +85°C, unless otherwise noted. Typical values are at nominal supply voltage and TA = +25°C, unless otherwise noted. Note 1 PARAMETER Supply Voltage Note 2 Logic 1 SYMBOL VCC DS139x-33 DS139x-3 DS139x-18 Note 2 CONDITIONS Logic 0 Supply Voltage, Pullup SQW/INT, SQW, INT, VCC = 0V VBACKUP Voltage Note 2 Power-Fail Voltage Note 2 Trickle-Charge Current-Limiting Resistors Input Leakage I/O Leakage RST Pin I/O Leakage DOUT Logic 1 Output DOUT Logic 0 Output Logic 0 Output DS1390/DS1393 SQW/INT DS1392 SQW, INT DS1391/DS1393 RST VCC Active Supply Current Note 10 Note 2 Note 2 VBACKUP R1 R2 R3 ILI ILO ILORST IOHDOUT IOHDOUT -33 -3 -18 -33 -3 -18 Notes 3, 4 Notes 3, 5 Notes 3, 6 Note 7 Note 8 Note 9 -33, -3 VOH = x VCC -18 VOH = x VCC -33, -3 VOL = x VCC -18 VOL = x VCC IOLSIR VCC > 1.71V VOL = 0.4V 1.3V < VCC < 1.71V VOL = 0.4V ICCA MIN x VCC -1 -1 -200 TYP MAX UNITS VCC + x VCC VCC MAX 2000 4000 -1 mA

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DS1390/DS1391/DS1392/DS1393

Low-Voltage SPI/3-Wire RTCs with Trickle Charger

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, minutes, 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 VCC 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 frequencies. 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.

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 to 5.5V

Industrial Temperature Range -40°C to +85°C Underwriters Laboratory UL Recognized

Hand-Held Devices GPS/Telematics Devices Embedded Time Stamping Medical Devices

Typical Operating Circuits and Pin Configurations appear at end of the data sheet.
Ordering Information

PART

TEMP RANGE

PINPACKAGE

TOP MARK

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

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

Low-Voltage SPI/3-Wire RTCs with Trickle Charger

DS1390/DS1391/DS1392/DS1393

ABSOLUTE MAXIMUM RATINGS

Voltage Range on VCC Pin Relative to Ground .....-0.3V to +6.0V Voltage Range on Inputs Relative
to Ground to VCC + 0.3V Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-55°C to +125°C Soldering Temperature 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

VCC = VCC MIN to VCC MAX , TA = -40°C to +85°C, unless otherwise noted. Typical values are at nominal supply voltage and TA = +25°C, unless otherwise noted. Note 1

PARAMETER Supply Voltage Note 2 Logic 1

SYMBOL VCC

DS139x-33 DS139x-3 DS139x-18

Note 2

CONDITIONS

Logic 0

Supply Voltage, Pullup SQW/INT, SQW, INT, VCC = 0V

VBACKUP Voltage Note 2

Power-Fail Voltage Note 2

Trickle-Charge Current-Limiting Resistors Input Leakage I/O Leakage RST Pin I/O Leakage DOUT Logic 1 Output

DOUT Logic 0 Output Logic 0 Output DS1390/DS1393 SQW/INT DS1392 SQW, INT DS1391/DS1393 RST

VCC Active Supply Current Note 10

Note 2

Note 2

VBACKUP

R1 R2 R3 ILI ILO ILORST IOHDOUT

IOHDOUT
-33 -3 -18 -33 -3 -18 Notes 3, 4 Notes 3, 5 Notes 3, 6 Note 7 Note 8 Note 9 -33, -3 VOH = x VCC -18 VOH = x VCC -33, -3 VOL = x VCC -18 VOL = x VCC

IOLSIR

VCC > 1.71V VOL = 0.4V 1.3V < VCC < 1.71V VOL = 0.4V

ICCA

MIN x VCC
-1 -1 -200

TYP MAX UNITS

VCC +
x VCC

VCC MAX
2000
4000
-1 mA

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Datasheet ID: DS1391U-33 647158