IDT5P90005 Datasheet, PDF (1/16 Pages) Integrated Device Technology – SERIAL REAL-TIME CLOCK

SERIAL REAL-TIME CLOCK
PRELIMINARY DATASHEET
IDT5P90005
Description
The IDT5P90005 is a serial real-time clock (RTC) device
that consumes ultra-low power and provides a full
binary-coded decimal (BCD) clock/calendar. The
clock/calendar provides seconds, minutes, hours, day,
date, month, and year information. The clock operates in
either the 24-hour or 12-hour format with AM/PM indicator.
The end of the month date is automatically adjusted for
months with fewer than 31 days, including corrections for
leap year. Access to the clock/calendar registers is
provided by an I²C interface capable of operating in fast I²C
mode. Built-in Power-sense circuitry detects power failures
and automatically switches to the backup supply,
maintaining time and date operation.
Features
• Packaged in 8-pin SOIC
• Counters for seconds, minutes, hours, days, date,
months, years, and century
• 32 kHz crystal oscillator integrating load capacitance
(12.5 pF) providing exceptional oscillator stability and
high crystal series resistance operation
• Serial interface supports I2C bus (100 or 400 kHz
protocol)
• Ultra low battery supply current of 0.8 µA (typ at 3 V)
• 2.0 to 5.5 V clock operating voltage
• Automatic switch over and deselect circuitry
• Automatic leap year compensation
• Operating temperature of -40 to +85°C
Block Diagram
OSCI
OSCO
VCC
GND
V_BAT
SCL
SDA
1 Hz
32.768 kHz
Oscillator and
Divider
MUX/
Buffer
Power
Control
Control
Logic
Clock, Calendar
Counter
I²C
Interface
1 Byte 7 Bytes
Control Buffer
FT/OUT
IDT™ SERIAL REAL-TIME CLOCK
1
IDT5P90005 REV E 031209