DS1388 I2C RTC/Supervisor Datasheet

DS1388 Datasheet, PDF, Equivalent


Part Number

DS1388

Description

I2C RTC/Supervisor

Manufacture

Maxim Integrated

Total Page 19 Pages
Datasheet
Download DS1388 Datasheet


DS1388
DS1388
I2C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
General Description
The DS1388 I2C real-time clock (RTC), supervisor, and
EEPROM is a multifunction device that provides a
clock/calendar, programmable watchdog timer, power-
supply monitor with reset, and 512 bytes of EEPROM.
The clock provides hundredths of seconds, seconds,
minutes, and hours, and operates in 24-hour or 12-hour
format with an AM/PM indicator. The calendar provides
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. A watchdog timer provides a reset for an unre-
sponsive microprocessor. It is programmable in 10ms
intervals from 0.01 to 99.99 seconds. A temperature-
compensated voltage reference and comparator circuit
monitors the status of VCC. If a primary power failure is
detected, the device automatically switches to the
backup supply and drives the reset output to the active
state. The backup supply maintains time and date
operation in the absence of VCC. When VCC returns to
nominal levels, the reset is held low for a period to allow
the power supply and processor to stabilize. The
device also has a pushbutton reset controller, which
debounces a reset input signal. The device is
accessed through an I2C serial interface.
Applications
Portable Instruments
Point-of-Sale Equipment
Network Interface Cards
Wireless Equipment
Pin Configuration
Features
o Fast (400kHz) I2C Interface
o RTC Counts Hundredths of Seconds, Seconds,
Minutes, Hours, Day, Date, Month, and Year with
Leap Year Compensation Valid Up to 2100
o Programmable Watchdog Timer
o Automatic Power-Fail Detect and Switch Circuitry
o Reset Output with Pushbutton Reset Input
Capability
o 512 x 8 Bits of EEPROM
o Integrated Trickle-Charge Capability for Backup
Supply
o Three Operating Voltages: 5.0V, 3.3V, and 3.0V
o Low Timekeeping Voltage Down to 1.3V
o -40°C to +85°C Temperature Range
o UL Recognized
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
TOP
MARK
DS1388Z-5+ -40°C to +85°C 8 SO (150 mils) DS1388-5
DS1388Z-33+ -40°C to +85°C 8 SO (150 mils) DS138833
DS1388Z-3+ -40°C to +85°C 8 SO (150 mils) DS1388-3
+Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
TOP VIEW
X1 1 +
X2 2
VBACKUP 3
DS1388
GND 4
SO
8 VCC
7 RST
6 SCL
5 SDA
VCC
VCC
CRYSTAL
VCC
RPU RPU
CPU
X1 X2 VCC
SCL
DS1388
SDA RST
VBACKUP
GND
RPU = tR/CB
For pricing, delivery, and ordering information, please contact Maxim Direct at
1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
19-4984; Rev 4 4/13

DS1388
DS1388
I2C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
ABSOLUTE MAXIMUM RATINGS
Voltage Range on VCC or VBACKUP Pins
Relative to Ground.............................................-0.3V to +6.0V
Voltage Range on Inputs Relative
to Ground ...............................................-0.3V to (VCC + 0.3V)
Junction-to-Ambient Thermal Resistance (θJA) (Note 1)..170°C/W
Junction-to-Case Thermal Resistance (θJC) (Note 1) ......40°C/W
Operating Temperature Range
(noncondensing) .............................................-40°C to +85°C
Storage Temperature Range .............................-55°C to +125°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
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
(TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
Supply Voltage
SYMBOL
VCC (Note 3)
CONDITIONS
DS1388Z-5
DS1388Z-33
DS1388Z-3
Logic 1
VIH (Note 3)
Logic 0
Pullup Voltage (SCL, SDA),
VCC = 0V
VBACKUP Voltage
Power-Fail Voltage
VIL (Note 3)
VPU
VBACKUP (Note 3)
VPF (Note 3)
DS1388Z-5
DS1388Z-33
DS1388Z-3
MIN
4.5
2.97
2.7
0.7 x
VCC
-0.3
1.3
4.15
2.70
2.45
TYP
5
3.3
3
MAX
5.5
3.63
3.3
VCC +
0.3
+0.3 x
VCC
UNITS
V
V
V
5.5 V
3.0 5.5
4.33 4.50
2.88 2.97
2.60 2.70
V
V
DC ELECTRICAL CHARACTERISTICS
(VCC = VCC(MIN) to VCC(MAX), TA = -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER
Trickle-Charger Current-Limiting
Resistors
Input Leakage (SCL)
I/O Leakage (SDA)
I/O Leakage (RST)
SDA Logic 0 Output
(VOL = 0.15 x VCC)
SYMBOL
R1
R2
R3
ILI
ILO
ILORST
IOLDOUT
CONDITIONS
(Notes 4, 5)
(Note 6)
(Note 7)
(Note 8)
MIN
-1
-1
-200
TYP
250
2000
4000
MAX UNITS

+1 μA
+1 μA
+10 μA
3 mA
2 Maxim Integrated


Features DS1388 I2C RTC/Supervisor with Trickle C harger and 512 Bytes EEPROM General De scription The DS1388 I2C real-time cloc k (RTC), supervisor, and EEPROM is a mu ltifunction device that provides a cloc k/calendar, programmable watchdog timer , powersupply monitor with reset, and 5 12 bytes of EEPROM. The clock provides hundredths of seconds, seconds, minutes , and hours, and operates in 24-hour or 12-hour format with an AM/PM indicator . The calendar provides day, date, mont h, and year information. The date at th e end of the month is automatically adj usted for months with fewer than 31 day s, including corrections for leap year. A watchdog timer provides a reset for an unresponsive microprocessor. It is p rogrammable in 10ms intervals from 0.01 to 99.99 seconds. A temperaturecompens ated voltage reference and comparator c ircuit monitors the status of VCC. If a primary power failure is detected, the device automatically switches to the b ackup supply and drives the reset output to the active state. T.
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