isl1220 Intersil Corporation, isl1220 Datasheet - Page 2

• Manufacturer Part Number: isl1220
• Description: Low Power Rtc With 8 Bytes Of Battery Backed Sram And Separate Fout
• Manufacturer: Intersil Corporation

Block Diagram
Pin Descriptions
NUMBER
PIN
10
1
2
3
4
5
6
7
8
9
SYMBOL
V
V
SDA
SCL
GND
BAT
F
DD
V
GND
SDA
SCL
V
X1
X2
IRQ
NC
X1
X2
OUT
BAT
DD
V
TRIP
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.
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.
This input provides a backup supply voltage to the device. V
V
Ground.
No Connection
Frequency Output (F
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.
The Serial Clock (SCL) input is used to clock all serial data into and out of the device.
Interrupt Output. Open drain output, active low.
Power supply.
DD
BUFFER
BUFFER
2
SDA
SCL
supply fails. This pin should be tied to ground if not used.
OSCILLATOR
CRYSTAL
POR
OUT
INTERNAL
SWITCH
SUPPLY
INTERFACE
). Open drain output, Programmable to be active/disabled in battery back up mode.
I
2
C
FREQUENCY
DIVIDER
ISL1220
RTC
OUT
DESCRIPTION
CONTROL
ALARM
LOGIC
BAT
supplies power to the device in the event that the
DAY OF WEEK
REGISTERS
SECONDS
CONTROL
MINUTES
HOURS
MONTH
SRAM
YEAR
USER
DATE
F
IRQ
OUT
June 22, 2006
FN6315.0