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PDF DS1393 Data sheet ( Hoja de datos )
| Número de pieza | DS1393 | |
| Descripción | (DS1390 - DS1393) Low-Voltage SPI/3-Wire RTCs | |
| Fabricantes | Maxim Integrated Products | |
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Rev 0; 7/04
Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
General Description
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 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 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
Applications
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
PIN-
PACKAGE
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
Where “rr” is a revision code on the second line of the top mark.
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.
1 page  
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Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
AC ELECTRICAL CHARACTERISTICS—3-WIRE INTERFACE
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C.) (Note 1) (Figures 3, 4)
PARAMETER
SCLK Frequency (Note 13)
Data to SCLK Setup
SCLK to Data Hold
SCLK to Data Valid (Notes 13,
14, 15)
SCLK Low Time (Note 13)
SCLK High Time (Note 13)
SCLK Rise and Fall
CS to SCLK Setup
SCLK to CS Hold
CS Inactive Time (Note 13)
CS to Output High Impedance
SYMBOL
fSCLK
tDC
tCDH
tCDD
tCL
tCH
tR, tF
tCC
tCCH
tCWH
tCDZ
CONDITION
2.7V ≤ VCC ≤ 5.5V
1.71V ≤ VCC ≤ 1.89V
(Notes 13, 14)
(Notes 13, 14)
2.7V ≤ VCC ≤ 5.5V
1.71V ≤ VCC ≤ 1.89V
2.7V ≤ VCC ≤ 5.5V
1.71V ≤ VCC ≤ 1.89V
2.7V ≤ VCC ≤ 5.5V
1.71V ≤ VCC ≤ 1.89V
(Note 13)
(Note 13)
2.7V ≤ VCC ≤ 5.5V
1.71V ≤ VCC ≤ 1.89V
(Note 13, 14)
MIN TYP MAX UNITS
4
MHz
1
30 ns
30 ns
80
ns
160
110
ns
400
110
ns
400
200 ns
400 ns
100 ns
400
ns
500
40 ns
AC ELECTRICAL CHARACTERISTICS
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETER
Pushbutton Debounce
Reset Active Time
Oscillator Stop Flag (OSF) Delay
SYMBOL
PBDB
tRST
tOSF
(Note 16)
CONDITIONS
MIN TYP MAX UNITS
160 200
ms
160 200
ms
100 ms
_____________________________________________________________________ 5
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Low-Voltage SPI/3-Wire RTCs with
Trickle Charger
Functional Diagram
X1
X2
VCC
GND
VBACKUP
(DS1390/91) CS
(DS1392/93) (CE)
SCLK
(DS1390/91) DIN
(DS1390/91) DOUT
(DS1392/93) I/O
32,768Hz
CRYSTAL
OSCILLATOR
VCC LEVEL DETECT,
POWER SWITCH,
WRITE PROTECT,
TRICKLE CHARGER
BUS
INTERFACE
HUNDREDTHS-OF-
SECONDS
GENERATOR
REAL-TIME CLOCK
WITH HUNDREDTHS
OF SECONDS
SQUARE-WAVE RATE
SELECTOR, INT, MUX,
RST OUTPUT
SQW/INT (DS1390/93)
RST (DS1391/93)
SQW (DS1392)
ALARM REGISTERS
CONTROL/STATUS
REGISTERS
TRICKLE REGISTER
DS1390/DS1391/
DS1392/DS1393
Detailed Description
The DS1390/DS1391/DS1392/DS1393 RTCs are low-
power clocks/calendars with alarms. Address and data
are transferred serially through a 4-wire SPI interface
for the DS1390 and DS1391 and through a 3-wire inter-
face for the DS1392 and DS1393. The clocks/calendars
provide hundredths of seconds, seconds, minutes,
hours, day, date, month, and year information. The
alarm functions are performed off all timekeeping regis-
ters, allowing the user to set high resolution alarms. The
date at the end of the month is automatically adjusted
for months with fewer than 31 days, including correc-
tions for leap year. The clocks operate in either the 24-
hour or 12-hour format with an AM/PM indicator. All four
devices have a built-in temperature-compensated volt-
age reference that detects power failures and automati-
cally switches to the battery supply. Additionally, the
devices can provide trickle charging of the backup
voltage source, with selectable charging resistance
and diode voltage drops.
Operation
The DS1390/DS1391 operate as a slave device on the
SPI serial bus. The DS1392/DS1393 operate using a
3-wire synchronous serial bus. Access is obtained by
selecting the part by the CS pin (CE on DS1392/
DS1393) and clocking data into/out of the part using
the SCLK and DIN/DOUT pins (I/O on DS1392/
DS1393). Multiple-byte transfers are supported within
one CS low period (see the SPI Serial-Data Bus sec-
tion). The devices are fully accessible and data can be
written and read when VCC is greater than VPF.
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet DS1393.PDF ] | |
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