OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

DS1391U-3+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26
19-4898; Rev 4; 10/12
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
General Description
The low-voltage serial-peripheral interface (SPI™)
DS1390/DS1391/DS1394 and the low-voltage 3-wire
DS1392/DS1393 real-time clocks (RTCs) are clocks/cal-
endars 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 V
CC
and automatically disables the bus
interface and 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, DS1391, and DS1394 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 sepa-
rate interrupt pin or a RST output/debounced input.
All five devices are available in a 10-pin µSOP package,
and are rated over the industrial temperature range.
Applications
Hand-Held Devices
GPS/Telematics Devices
Embedded Time Stamping
Medical Devices
Features
o Real-Time Clock Counts Hundredths of Seconds,
Seconds, Minutes, Hours, Day, Date, Month, and
Year with Leap-Year Compensation Valid Up to
2100
o Output Pin Configurable as Interrupt or Square
Wave with Programmable Frequency of
32.768kHz, 8.192kHz, 4.096kHz, or 1Hz
(DS1390/DS1393/DS1394 Only)
o One Time-of-Day Alarm
o Power-Fail Detect and Switch Circuitry
o Reset Output/Debounced Input (DS1391/DS1393)
o Separate SQW and INT Output (DS1392)
o Trickle-Charge Capability
o SPI Supports Modes 0 and 2 (DS1394)
o SPI Supports Modes 1 and 3 (DS1390/DS1391)
o 3-Wire Interface (DS1392/DS1393)
o 4MHz at 3.0V and 3.3V
o 1MHz at 1.8V
o Three Operating Voltages: 1.8V ±5%, 3.0V ±10%,
and 2.97 to 5.5V (DS1394: 3.3V ±10%)
o Industrial Temperature Range: -40°C to +85°C
o Underwriters Laboratories (UL) Recognized
Ordering Information
Typical Operating Circuits and Pin Configurations appear at
end of the data sheet.
Note: All devices are rated for the -40°C to +85°C operating
temperature range.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
†
A “+” anywhere on the top mark denotes a lead(Pb)-
free/RoHS-compliant package.
rr = Revision code on second line of top mark.
PART
TYP
OPERATING
VOLTAGE (V)
PIN-
PACKAGE
TOP MARK
†
DS1390U-18+ 1.8 10 µSOP 1390 rr-18
DS1390U-3+ 3.0 10 µSOP 1390 rr-3
DS1390U-33+ 3.3 10 µSOP 1390 rr-33
DS1391U-18+ 1.8 10 µSOP 1391 rr-18
DS1391U-3+ 3.0 10 µSOP 1391 rr-3
DS1391U-33+ 3.3 10 µSOP 1391 rr-33
DS1392U-18+ 1.8 10 µSOP 1393 rr-18
DS1392U-3+ 3.0 10 µSOP 1392 rr-3
DS1392U-33+ 3.3 10 µSOP 1392 rr-33
DS1393U-18+ 1.8 10 µSOP 1393 rr-18
DS1393U-3+ 3.0 10 µSOP 1393 rr-3
DS1393U-33+ 3.3 10 µSOP 1393 rr-33
DS1394U-33+ 3.3 10 µSOP 1394 rr-33
SPI is a trademark of Motorola, Inc.
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
2
Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
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
A
= +25°C,
unless otherwise noted.) (Note 1)
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.
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...........................Refer to the IPC/JEDEC
J-STD-020 Specification.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DS139x-33 2.97 3.3 5.50
DS139x-3 2.7 3.0 3.3
Supply Voltage (Note 2) V
CC
DS139x-18 1.71 1.8 1.89
V
Logic 1 V
IH
(Note 2)
0.7 x
V
CC
V
CC
+
0.5
V
Logic 0 V
IL
(Note 2) -0.3
+0.3 x
V
CC
V
Supply Voltage, Pullup
SQW/INT, SQW, INT, V
CC
= 0V
V
PU
(Note 2) 5.5 V
-33 1.3 3.0 V
CC(MAX)
-3 1.3 3.0 3.7
V
BACKUP
Voltage (Note 2) V
BACKUP
-18 1.3 3.0 3.7
V
-33 2.70 2.88 2.97
-3 2.45 2.6 2.70
Power-Fail Voltage (Note 2) V
PF
-18 1.51 1.6 1.71
V
R1 (Notes 3, 4) 250
R2 (Notes 3, 5) 2000
Trickle-Charge Current-Limiting
Resistors
R3 (Notes 3, 6) 4000
Input Leakage I
LI
(Note 7) -1 +1 µA
I/O Leakage I
LO
(Note 8) -1 +1 µA
RST Pin I/O Leakage I
LORST
(Note 9) -200 +10 µA
-33, -3 (V
OH
= 0.85 x V
CC
) -1
DOUT Logic 1 Output I
OHDOUT
-18 (V
OH
= 0.80 x V
CC
) 0.750
mA
-33, -3 (V
OL
= 0.15 x V
CC
) 3
DOUT Logic 0 Output I
OHDOUT
-18 (V
OL
= 0.20 x V
CC
) 2
mA
V
CC
> 1.71V; V
OL
= 0.4V 3.0 mA
Logic 0 Output
(DS1390/DS1393/DS1394
SQW/INT; DS1392 SQW, INT;
DS1391/DS1393 RST)
I
OLSIR
1.3V < V
CC
< 1.71V; V
OL
= 0.4V 250 µA
-33 2
-3 2
mA
V
CC
Active Supply Current
(Note 10)
I
CCA
-18 500 µA
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
3
Maxim Integrated
RECOMMENDED DC OPERATING CONDITIONS (continued)
(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
A
= +25°C,
unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
-33 115 175
-3 80 125
V
CC
Standby Current
(Note 11)
I
CCS
-18 60 100
µA
V
BACKUP
Leakage Current
(V
BACKUP
= 3.7V,
V
CC
= V
CC(MAX)
)
I
BACKUPLKG
15 100 nA
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BACKUP
Current OSC On,
SQW Off
I
BACKUP1
(Note 12) 500 1000 nA
V
BACKUP
Current OSC On,
SQW On (32kHz)
I
BACKUP2
(Note 12) 600 1150 nA
V
BACKUP
Current OSC On,
SQW On, V
BACKUP
= 3.0V,
T
A
= +25°C
I
BACKUP3
(Note 12) 600 1000 nA
V
BACKUP
Current, OSC Off
(Data Retention)
I
BACKUPDR
(Note 12) 25 100 nA
AC ELECTRICAL CHARACTERISTICS—SPI INTERFACE
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
2.7V V
CC
5.5V 0 4
SCLK Frequency (Note 13) f
SCLK
1.71V V
CC
1.89V 0 1
MHz
Data to SCLK Setup t
DC
(Notes 13, 14) 30 ns
SCLK to Data Hold t
CDH
(Notes 13, 14) 30 ns
2.7V V
CC
5.5V 80
SCLK to Data Valid
(Notes 13, 14, 15)
t
CDD
1.71V V
CC
1.89V 160
ns
2.7V V
CC
5.5V 110
SCLK Low Time (Note 13) t
CL
1.71V V
CC
1.89V 400
ns
2.7V V
CC
5.5V 110
SCLK High Time (Note 13) t
CH
1.71V V
CC
1.89V 400
ns
SCLK Rise and Fall t
R
, t
F
200 ns
CS to SCLK Setup (Note 13) t
CC
400 ns
SCLK to CS Hold (Note 13) t
CCH
100 ns
2.7V V
CC
5.5V 400
CS Inactive Time (Note 13) t
CWH
1.71V V
CC
1.89V 500
ns
CS to Output High Impedance t
CDZ
(Notes 13, 14) 40 ns
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P26

DS1391U-3+

Mfr. #:
Buy DS1391U-3+
Manufacturer:
Maxim Integrated
Description:
Real Time Clock Low-V SPI/3-Wire With Trickle Charger
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet