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Renesas Electronics Components Datasheet

ISL12008 Datasheet

I2C Real Time Clock

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DATASHEET
ISL12008 I2C Real Time Clock with Battery Backup
Low Power RTC with Battery ReSeal™ Function
FN6690
Rev 1.00
Sep 26, 2008
The ISL12008 device is a low power real time clock/calendar
that is pin compatible and functionally equivalent to the
ST M41T00S and Maxim DS1340 with timing and crystal
compensation. The device additionally provides power-fail
indicator, software alarm and intelligent battery backup.
The oscillator uses an external, low-cost 32.768kHz crystal.
The real time clock tracks time with separate registers for
hours, minutes, and seconds. The device has calendar
registers for date, month, year and day of the week. The
calendar is accurate through 2099, with automatic leap year
correction.
Pinout
X1
X2
VBAT
GND
ISL12008
(8 LD SOIC)
TOP VIEW
18
27
36
45
VDD
FT/OUT
SCL
SDA
Ordering Information
PART
NUMBER
(Note)
PART
VDD
RANGE
MARKING (V)
TEMP.
RANGE PACKAGE PKG.
(°C) (Pb-free) DWG. #
ISL12008IB8Z 12008 IBZ 2.7 to 5.5 -40 to +85 8 Ld SOIC M8.15
ISL12008IB8Z-T* 12008 IBZ 2.7 to 5.5 -40 to +85 8 Ld SOIC M8.15
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special
Pb-free material sets, molding compounds/die attach materials, and
100% matte tin plate plus anneal (e3 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations). Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Features
• Pin Compatible to ST M41T00S and Maxim DS1340
• Functionality Equivalent to ST M41T00S and Maxim
DS1340
• Real Time Clock/Calendar
- Tracks Time in Hours, Minutes, Seconds and
Sub-seconds
- Day of the Week, Day, Month, and Year
• 512Hz Frequency Outputs for On-Chip Crystal
Compensation
• Software Alarm
- Settable to the Second, Minute, Hour, Day of the Week,
Day, or Month
• Automatic Low-Drop Battery Switch for Longest Backup
Life
• Power Failure Detection
• Battery ReSealfor Long Shelf Life
• I2C Bus™
- 400kHz Data Transfer Rate
• 800nA Battery Supply Current
• Small Package Option
- 8 Ld SOIC
• Pb-Free (RoHS Compliant)
Applications
• Utility Meters
• HVAC Equipment
• Audio/Video Components
• Set-Top Box/Television
• Modems
• Network Routers, Hubs, Switches, Bridges
• Cellular Infrastructure Equipment
• Fixed Broadband Wireless Equipment
• Pagers/PDA
• POS Equipment
• Test Meters/Fixtures
• Office Automation (Copiers, Fax)
• Home Appliances
• Computer Products
• Other Industrial/Medical/Automotive
.
FN6690 Rev 1.00
Sep 26, 2008
Page 1 of 19


Renesas Electronics Components Datasheet

ISL12008 Datasheet

I2C Real Time Clock

No Preview Available !

ISL12008 I2C Real Time Clock with Battery Backup
Block Diagram
SDA
SCL
SDA
BUFFER
SCL
BUFFER
I2C
INTERFACE
X1
X2
VDD
VTRIP
VBAT
CRYSTAL
OSCILLATOR
RTC
DIVIDER
POR
FREQUENCY
OUT
SWITCH
INTERNAL
SUPPLY
RTC
CONTROL
LOGIC
SECONDS
MINUTES
HOURS
DAY OF WEEK
DATE
MONTH
YEAR
CONTROL
REGISTERS
FT/OUT
Pin Descriptions
PIN
NUMBER SYMBOL
DESCRIPTION
1 X1 The X1 pin is the input of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz
crystal. X1 can also be driven directly from a 32.768kHz source.
2 X2 The X2 pin is the output of an inverting amplifier and is intended to be connected to one pin of an external 32.768kHz quartz
crystal.
3 VBAT This input provides a backup supply voltage to the device. VBAT supplies power to the device in the event that the VDD supply
fails. This pin should be tied to ground if not used.
4 GND Ground
5 SDA Serial Data (SDA) is a bidirectional pin used to transfer serial data into and out of the device. It has an open drain output and
may be wire OR’ed with other open drain or open collector outputs.
6 SCL The Serial Clock (SCL) input is used to clock all serial data into and out of the device.
7 FT/OUT 512Hz Frequency Output or digital output pin. The function is set via the configuration register. This pin is open drain and
requires an external pull-up resistor.
8 VDD Power supply
FN6690 Rev 1.00
Sep 26, 2008
Page 2 of 19


Part Number ISL12008
Description I2C Real Time Clock
Maker Renesas
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