ISL12008IB8Z Intersil, ISL12008IB8Z Datasheet - Page 6

• Manufacturer Part Number: ISL12008IB8Z
• Description: IC RTC I2C LO-POWER 8-SOIC
• Manufacturer: Intersil
• Type: Clock/Calendarr

Specifications of ISL12008IB8Z

• Time Format: HH:MM:SS (24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -

Typical Performance Curves
General Description
The ISL12008 device is a low power real time clock with
timing and crystal compensation, clock/calendar, power fail
indicator, software alarm, and intelligent battery backup
switching.
The oscillator uses an external, low-cost 32.768kHz crystal.
The real time clock tracks time with separate registers for
hours, minutes, seconds, and sub-seconds. The device has
calendar registers for date, month, year and day of the week.
FIGURE 5. STANDARD OUTPUT LOAD FOR TESTING THE
3.5
3.0
2.5
2.0
1.5
1.0
0.2
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
-40
1.8
EQUIVALENT AC OUTPUT LOAD CIRCUIT FOR V
FT/OUT
FIGURE 3. I
2.3
DEVICE WITH V
-20
AND
SDA
FIGURE 1. I
2.8
0
DD1
TEMPERATURE (°C)
3.3
5.0V
DD
vs TEMPERATURE
V
BAT
6
BAT
20
= 5.0V
100pF
1533Ω
vs V
(V)
3.8
BAT
40
V
4.3
FOR V
AND I
Temperature is +25°C, unless otherwise specified.
DD
= 5V
V
OL
OL
DD
DD
4.8
60
= 0.4V
= 3mA
= 5V
= 3.3V
5.3
80
ISL12008
The calendar is accurate through 2099, with automatic leap
year correction.
The ISL12008's powerful alarm can be set to any
clock/calendar value for a match. For example, every
minute, every Tuesday or at 5:23 AM on March 21. The
alarm status is available by checking the Status Register.
The device also offers a backup power input pin. This V
pin allows the device to be backed up by battery or super
capacitor with automatic switchover from V
entire ISL12008 device is fully operational from 2.7V to 5.5V
and the clock/calendar portion of the device remains fully
operational down to 1.8V in battery mode.
Pin Descriptions
X1, X2
The X1 and X2 pins are the input and output, respectively, of
an inverting amplifier. An external 32.768kHz quartz crystal is
used with the ISL12008 to supply a timebase for the real time
clock. Internal compensation circuitry provides high accuracy
over the operating temperature range from -40°C to +85°C.
This oscillator compensation network can be used to calibrate
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
0.60
0.55
0.50
3.5
3.0
2.5
2.0
1.5
1.0
0.5
FIGURE 4. I
FIGURE 2. I
1.8
-40
2.3
-20
DD1
BAT
2.8
vs V
vs TEMPERATURE AT V
LP MODE OFF
0
DD
TEMPERATURE (°C)
3.3
WITH LPMODE ON AND OFF
V
DD
20
(V)
3.8
40
4.3
LP MODE ON
DD
BAT
September 26, 2008
to V
4.8
60
= 3V
BAT
FN6690.1
. The
5.3
BAT
80