PT7C4339 Datasheet, PDF (1/22 Pages) Pericom Semiconductor Corporation – Real-time Clock Module

PT7C4339/4339C
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Real-time Clock Module
Features
 Real-Time Clock (RTC) Including Time (Seconds,
Minutes and Hours) and Calendar (Day, Date,
Month and Year with Leap-Year Compensation
Valid Up to 2100) counter functions (BCD code)
 Available in a Surface-Mount Package with an
Integrated Crystal (Only for PT7C4339C)
 I²C Serial Interface supports I²C-Bus's high speed
mode (400 kHz)
 Programmable square wave output signal, defaults
to 32 kHz on Power-up
 Two Time-of-Day Alarms
 Oscillator Stop Flag
 Automatic Power-Fail Detect and Switch Circuitry
 Temperature Range: -40°C to +85°C
 Package: MSOP-8L and SOIC-8L for PT7C4339
TDFN4x4-8L for PT7C4339C
Applications
Description
The PT7C4339 real-time clock is a low-power
clock/calendar device with two programmable time-of-
day alarms and a programmable square-wave output.
Address and data are transferred serially through an I²C
bus. The clock/calendar provides seconds, minutes,
hours, 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. The clock operates in either the 24-hour or
12-hour format with AM/PM indicator. The PT7C4339
has a build-in power-sense circuit that detects power
failures and automatically switch to the backup supply,
maintaining time, date, and alarm operation.
Pin Configuration
PT7C4339
PT7C4339C
1 X1
V_CC 8
1 _NC
NC ⁸
2 X2
SQW/INT 7
2 V_BACKUP
SCL ⁷
3 V_BACKUP
SCL ⁶
3 _GND
SQW/INT ⁶
4 _GND
SDA ⁵
4 _SDA
V_CC 5
SOIC-8
MSOP8
DFN4*4-8L
Table1. Diverse functions of RTC circuits
Item
Function
Source
External crystal
1 Oscillator
Oscillator enable/disable
Oscillator fail detect
2 Time
Time display
Century bit
12-hour
24-hour
Time count chain enable/disable
3 Interrupt
Alarm interrupt output
4 Programmable square wave output (Hz)
5 Communication
2-wire I²C bus
6 Power failure detect
PT7C4339
External crystal






2
1, 4.096k, 8.192k, 32.768k


PT7C4339C
Integrated Crystal






2
1, 4.096k, 8.192k, 32.768k


2015-08-0008
PT0508-1 08/24/15
1