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DS1388Z-5+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19
General Description
The DS1388 I
2
C 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 V
CC
. 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 V
CC
. When V
CC
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 I
2
C serial interface.
Applications
Portable Instruments
Point-of-Sale Equipment
Network Interface Cards
Wireless Equipment
Features
♦ Fast (400kHz) I
2
C Interface
♦ RTC Counts Hundredths of Seconds, Seconds,
Minutes, Hours, Day, Date, Month, and Year with
Leap Year Compensation Valid Up to 2100
♦ Programmable Watchdog Timer
♦ Automatic Power-Fail Detect and Switch Circuitry
♦ Reset Output with Pushbutton Reset Input
Capability
♦ 512 x 8 Bits of EEPROM
♦ Integrated Trickle-Charge Capability for Backup
Supply
♦ Three Operating Voltages: 5.0V, 3.3V, and 3.0V
♦ Low Timekeeping Voltage Down to 1.3V
♦ -40°C to +85°C Temperature Range
♦ UL Recognized
DS1388
I
2
C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
______________________________________________
Maxim Integrated Products
1
SO
TOP VIEW
+
DS1388
SCL
SDAGND
1
2
8
7
V
CC
RSTX2
V
BACKUP
X1
3
4
6
5
Pin Configuration
RST
V
CC
X1
SCL
X2
CPU
V
CC
SDA
GND
V
CC
RPU
RPU = t
R
/C
B
RPU
V
CC
CRYSTAL
V
BACKUP
DS1388
Typical Operating Circuit
19-4984; Rev 3; 8/10
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
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
DS1388
I
2
C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
2 _____________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
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)
Junction-to-Ambient Thermal Resistance (θ
JA
) (Note 1)..170°C/W
Junction-to-Case Thermal Resistance (θ
JC
) (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) .................................+260°C
Soldering Temperature (reflow) .......................................+260°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DS1388Z-5 4.5 5 5.5
DS1388Z-33 2.97 3.3 3.63
Supply Voltage V
CC
(Note 3)
DS1388Z-3 2.7 3 3.3
V
Logic 1 V
IH
(Note 3)
0.7 x
V
CC
V
CC
+
0.3
V
Logic 0 V
IL
(Note 3) -0.3
+0.3 x
V
CC
V
Pullup Voltage (SCL, SDA),
V
CC
= 0V
V
PU
5.5 V
V
BACKUP
Voltage V
BACKUP
(Note 3) 1.3 3.0 5.5 V
DS1388Z-5 4.15 4.33 4.50
DS1388Z-33 2.70 2.88 2.97
Power-Fail Voltage V
PF
(Note 3)
DS1388Z-3 2.45 2.60 2.70
V
DC ELECTRICAL CHARACTERISTICS
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
R1 (Notes 4, 5) 250
R2 (Note 6) 2000
Trickle-Charger Current-Limiting
Resistors
R3 (Note 7) 4000
Input Leakage (SCL) I
LI
-1 +1 μA
I/O Leakage (SDA) I
LO
-1 +1 μA
I/O Leakage (RST) I
LORST
(Note 8) -200 +10 μA
SDA Logic 0 Output
(V
OL
= 0.15 x V
CC
)
I
OLDOUT
3 mA
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.maxim-ic.com/thermal-tutorial
.
DS1388
I
2
C RTC/Supervisor with Trickle Charger
and 512 Bytes EEPROM
_____________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
CC(MIN)
to V
CC(MAX)
, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
CC
> 2V; V
OL
= 0.4V 3.0
1.8V < V
CC
< 2V; V
OL
= 0.2 x V
CC
3.0
mA
RST Logic 0 Output I
OLSIR
1.3V < V
CC
< 1.8V; V
OL
= 0.2 x V
CC
250 μA
DS1388Z-5 600
DS1388Z-33 250
V
CC
Active Current, EEPROM
Read, I
2
C Read/Write Access
I
CCER
(Note 9)
DS1388Z-3 225
μA
DS1388Z-5 1.0
DS1388Z-33 0.70
V
CC
Active Current, EEPROM
Write Cycle
I
CCEW
(Note 9)
DS1388Z-3 0.65
mA
DS1388Z-5 270
DS1388Z-33 100 150
V
CC
Standby Current I
CCS
(Note 10)
DS1388Z-3 140
μA
V
BACKUP
Leakage Current
(V
BACKUP
= 3.7V,
V
CC
= V
CC(MAX)
)
I
BACKUPLKG
15 100 nA
T
A
= +25°C (guaranteed by design) 200k
EEPROM Write/Erase Cycles t
WR
T
A
= -40°C to +85°C (guaranteed by
design)
50k
Cycles
DC ELECTRICAL CHARACTERISTICS
(V
CC
= 0V, V
BACKUP
= 3.7V, T
A
= +25°C, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
BACKUP
Current, OSC On
(EOSC = 0), SDA = SCL = 0V
I
BACKUP
(Note 11) 410 550 nA
V
BACKUP
Current, OSC Off
(EOSC = 1), SDA = SCL = 0V
(Data Retention)
I
BACKUPDR
(Note 11) 10 100 nA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P19

DS1388Z-5+

Mfr. #:
Buy DS1388Z-5+
Manufacturer:
Maxim Integrated
Description:
Real Time Clock I2C RTC/Supervisor w/Trickle Charger
Lifecycle:
New from this manufacturer.
Delivery:
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