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Номер произв PT7C4339C
Описание Real-time Clock Module
Производители Pericom Semiconductor
логотип Pericom Semiconductor логотип 



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PT7C4339C Даташит, Описание, Даташиты
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
VCC 8
1 NC
NC 8
2 X2
SQW/INT 7
2 VBACKUP
SCL 7
3 VBACKUP
SCL 6
3 GND
SQW/INT 6
4 GND
SDA 5
4 SDA
VCC 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









No Preview Available !

PT7C4339C Даташит, Описание, Даташиты
PT7C4339/4339C
Real-time Clock Module
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Pin Description
Pin No Pin Type
4339 4339C Name
1/
X1
I
2 / X2 O
6 7 SCL
I
5 4 SDA I/O
3 2 VBACKU O
P
7
6
SQW
/INT
O
85
VCC
4 3 GND
/ 1,8 NC
P
P
Description
Oscillator Circuit Input. Together with X1, 32.768kHz crystal is connected between them. Or
external clock input.
Oscillator Circuit Output. Together with X1, 32.768kHz crystal is connected between them.
When 32.768kHz external input, X2 must be float.
Serial Clock Input. SCL is used to synchronize data movement on the I2C serial interface. The
pull up voltage may be up to 5.5V regardless of the voltage on VCC.
Serial Data Input/Output. SDA is the input/output pin for the 2-wire serial interface. The SDA
pin is open-drain output and requires an external pull-up resistor. The pull up voltage may be up to
5.5V regardless of the voltage on VCC.
Secondary Power Supply. Supply voltage must be held between 1.3V and 3.7V for proper
operation. This pin can be connected to a primary cell, such as a lithium button cell. Additionally,
this pin can be connected to a rechargeable cell or a super cap when used in conjunction with the
trickle-charge feature. Diodes should not be placed in series between the backup source and the
VBACKUP input, or improper operation will result. If a backup supply is not required, VBACKUP must
be grounded.
Square-Wave/Interrupt Output. Programmable square-wave or interrupt output signal. It is an
open-drain output and requires an external pull up resistor. The pull up voltage may be up to 5.5V
regardless of the voltage on VCC. If not used, this pin may be left unconnected.
Power. When voltage is applied within normal limits, the device is fully accessible and data can be
written and read. When a backup supply is connected and VCC is below VPF, reads and writes are
inhibited. The timekeeping and alarm functions operate when the device is powered by VCC or
VBACKUP.
Ground.
No Connect. These pins are not connected internally, but must be grounded for proper operation.
Maximum Ratings
StorageTemperature....................................................................................-55oC to +125oC
Ambient Temperaturewith Power Applied..............................................-40oC to +85oC
SupplyVoltage to Ground Potential(VCCto GND)..................................-0.3Vto +6.0V
DC Input (All Other Imputs exceptVCC& GND) ...........................-0.3Vto VCC+0.3V
DC Output Voltage (SDA, SQW /INT pins).............................................-0.3Vto +6.0V
Power Dissipation...................................................................320mW(depend onpackage)
Lead Temperature(soldering, 10s)............................................................................+260 oC
SolderingTemperature (reflow).................................................................................+260 oC
Note:
Stresses greater than those listed under MAXIMUM
RATINGS may cause permanent damage to the
device. This is a stress rating only and functional
operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended Operating Conditions
Symbol
Description
VCC
VBACKUP
VIH
VIL
VPF
TA
Supply Voltage
Backup Supply Voltage
Input high level
Input low level
Power-Fail Voltage
Operation Temperature
Min
3.0
1.3
0.7VCC
-0.3
1.60
-40
Type
3.3
3.0
-
-
1.72
-
Max
5.5
3.7
VCC+0.3
0.3VCC
1.88
85
Unit
V
V
V
V
V
ºC
2015-08-0008
PT0508-1 08/24/15
2









No Preview Available !

PT7C4339C Даташит, Описание, Даташиты
PT7C4339/4339C
Real-time Clock Module
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DC Electrical Characteristics
Unless otherwise specified, VCC = MIN to MAX, VBACKUP=MIN to MAX, TA = -40 °C to +85 °C
Item
Sym.
Pin Condition Min Typ Max Units
Input Leakage
I/O Leakage
ILI
SCL
VIN=VCC or
GND
-1
ILO SDA, SQW/INT
-1
1 μA
1 μA
Logic0 Out VOL= 0.4V; VCC> VCCMIN
IOL1
IOL2
SQW/INT
SDA,
1.0 3.0
1.5 3.0
-
-
mA
mA
Logic 0 Out VOL= 0.2V;
VBACKUP >= VBACKMIN
VCC Active Current
VCC Standby Current(Note 2)
Trickle-Charger Resistor Register10h
= A5h, VCC = Typ, VBACKUP= 0V
Trickle-Charger Resistor Register10h
= A6h, VCC = Typ, VBACKUP = 0V
Trickle-Charger Resistor Register10h
= A7h, VCC = Typ, VBACKUP = 0V
VBACKUP Leakage Current
IOL1
ICCA
ICCS
R1
R2
R3
IBKLKG
SQW/INT
VCC = 3.3V
VCC = 5.5V
VCC absent,
BBSQI=1
(Note 1)
(Note 3)
VBACKUP
0.25 -
80 250
40 100
150
200
2000
4000
25
100
DC Electrical Characteristics
Unless otherwise specified, VCC = 0V, VBACKUP=MIN to MAX, TA = -40 °C to +85 °C
Item
Sym.
Condition
Min Typ Max
VBACKUP Current, /EOSC=0, SQW Off
VBACKUP Current, /EOSC=0, SQW On
IBKOSC
IBKSQW
Note 4, Note5
Note 4
300 600
400 900
VBACKUP Current, /EOSC=1
IBKDR
Note6
10 100
Note:
1. SCL clocking at max frequency = 400 kHz, VIL = 0.0V, VIH = VCC, trickle charger disabled.
2. Specified with 2-wire bus inactive, VIL = 0.0V, VIH = VCC, trickle charger disabled.
3. VCC must be less than 3.63V if 200Ω resistance is selected.
4. Using recommended crystal on X1 and X2.
5. Specified with the SQW function disabled by setting INTCN = 1.
6. Crystal oscillator is disabled.
mA
μA
μA
Ω
Ω
Ω
nA
Units
nA
nA
nA
2015-08-0008
PT0508-1 08/24/15
3










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