DS1394 SPI/3-Wire RTCs Datasheet

DS1394 Datasheet, PDF, Equivalent


Part Number

DS1394

Description

Low-Voltage SPI/3-Wire RTCs

Manufacture

Maxim Integrated

Total Page 27 Pages
Datasheet
Download DS1394 Datasheet


DS1394
Click here for production status of specific part numbers.
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/
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 program-
mable time-of-day alarm is provided. A temperature-com-
pensated voltage reference monitors the status of VCC
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 inter-
rupt or a square wave at one of four selectable frequen-
cies. 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 separate inter-
rupt 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
● 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/
DS1394 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 0 and 2 (DS1394)
● 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 (DS1394: 3.3V ±10%)
● Industrial Temperature Range: -40°C to +85°C
● Underwriters Laboratories (UL) Recognized
Ordering Information appears at end of the data sheet.
Typical Operating Circuits appear at end of the data sheet.
SPI is a trademark of Motorola, Inc.
19-4898; Rev 5; 7/19

DS1394
DS1390–DS1394
Low-Voltage SPI/3-Wire RTCs
with Trickle Charger
Absolute Maximum Ratings
Voltage Range on VCC Pin Relative to Ground....-0.3V to +6.0V
Voltage Range on Inputs Relative
to Ground............................................... -0.3V to (VCC + 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.
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
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/DS1394
SQW/INT; DS1392 SQW, INT;
DS1391/DS1393 RST)
VCC Active Supply Current
(Note 10)
SYMBOL
VCC
VIH
DS139x-33
DS139x-3
DS139x-18
CONDITIONS
(Note 2)
VIL (Note 2)
VPU
VBACKUP
VPF
R1
R2
R3
ILI
ILO
ILORST
IOHDOUT
IOHDOUT
IOLSIR
ICCA
(Note 2)
-33
-3
-18
-33
-3
-18
(Notes 3, 4)
(Notes 3, 5)
(Notes 3, 6)
(Note 7)
(Note 8)
(Note 9)
-33, -3 (VOH = 0.85 x VCC)
-18 (VOH = 0.80 x VCC)
-33, -3 (VOL = 0.15 x VCC)
-18 (VOL = 0.20 x VCC)
VCC > 1.71V; VOL = 0.4V
1.3V < VCC < 1.71V; VOL = 0.4V
-33
-3
-18
MIN
2.97
2.7
1.71
0.7 x
VCC
-0.3
1.3
1.3
1.3
2.70
2.45
1.51
-1
-1
-200
TYP
3.3
3.0
1.8
MAX
5.50
3.3
1.89
VCC +
0.5
+0.3 x
VCC
UNITS
V
V
V
5.5 V
3.0 VCC(MAX)
3.0 3.7
3.0 3.7
2.88 2.97
2.6 2.70
1.6 1.71
250
2000
4000
+1
+1
+10
-1
0.750
3
2
V
V
µA
µA
µA
mA
mA
3.0 mA
250 µA
2
2
mA
500 µA
www.maximintegrated.com
Maxim Integrated 2


Features Click here for production status of spec ific part numbers. DS1390–DS1394 Low -Voltage SPI/3-Wire RTCs with Trickle C harger General Description The low-vol tage serial-peripheral interface (SPI ) DS1390/DS1391/DS1394 and the low-vol tage 3-wire DS1392/DS1393 real-time clo cks (RTCs) are clocks/ calendars that p rovide hundredths of a second, seconds, minutes, hours, day, date, month, and year information. The date at the end o f the month is automatically adjusted f or months with fewer than 31 days, incl uding corrections for leap year. The cl ock operates in either the 24-hour or 1 2-hour format with an AM/PM indicator. One programmable time-of-day alarm is p rovided. A temperature-compensated volt age reference monitors the status of VC C and automatically disables the bus in terface and switches to the backup supp ly if a power failure is detected. On t he DS1390, a single open-drain output p rovides a CPU interrupt or a square wav e at one of four selectable frequencies. The DS1391 replaces the SQ.
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