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PT7C43390/43390C
Real-time Clock Module
Features
Low current consumption: 0.3µ typ. (V
DD
=3.0V,
A
T
A
= 25°
C)
Wide operating voltage range: 1.35 to 5.5 V
Minimum time keeping operation voltage: 1.25 V
Built-in clock adjustment function
Built-in free user register
2-wire (I
2
C-bus)
CPU interface
Built-in alarm interrupter
Built-in flag generator at power down or power on
Auto calendar up to the year 2099, automatic leap
year calculation function
Built-in constant voltage circuit
Built-in 32 kHz crystal oscillator circuit
Built-in 32 kHz crystal for PT7C43390C
Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L
for PT7C43390; TDFN4x4-8L for PT7C43390C
Description
The PT7C43390 is a CMOS I
2
C-bus real-time clock IC,
which operates with the very low current consumption
and in the wide range of operation voltage. The
operation voltage is 1.35 V to 5.5 V so that the RTC can
be used for various power supplies from main supply to
backup battery. In the system which operates with a
backup battery, the included free registers can be used as
the function for user’s backup memory. Users always
can take back the information in the registers which is
stored before power-off the main power supply, after the
voltage is restored.
The IC has the function to correct advance / delay of the
clock data speed, in the wide range, which is caused by
the oscillation circuit’s frequency deviation. Correcting
according to the temperature change by combining this
function and a temperature sensor, it is possible to make
a high precise clock function which is not affected by
the ambient temperature.
Applications
Mobile game device, mobile phone
Industrial control
Electronic power meter
DVD recorder
Car navigation
IP Camera, DVR, NVR
Function Table
Item
1
2
3
Oscillator
Time
Interrupt
Function
Source
Time display
Alarm interrupt pin output
Timer interrupt output
Crystal
*
12-hour
24-hour
PT7C43390
External crystal
2
1Hz,2Hz,4Hz
8Hz,16Hz
32kHz
PT0280-8
1
PT7C43390C
Integral crystal
2
1Hz,2Hz,4Hz
8Hz,16Hz
32kHz
12/11/15
4
Programmable square wave output (Hz)
2-wire I
2
C bus
Burst mode
IC test mode
Power-on detector
Power supply voltage detector
5
Communication
6
7
80
Control
Clock calibration
Free register access
2015-12-0001
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PT7C43390/43390C
Real-time Clock Module
Pin Configuration
PT7C43390
PT7C43390C
1
2
3
4
INT1
XOUT
XIN
GND
VDD
SDA
SCL
INT2
8
7
6
5
1
2
3
4
PT7C43390
INT1
XOUT
XIN
GND
VDD
SDA
SCL
INT2
8
7
6
5
PT7C43390
INT1
1
XOUT
2
XIN
3
8
7
6
5
INT1
VDD
SDA
SCL
INT2
1
2
3
NC1
NC2
GND
P
1
P
2
8
7
6
VDD
SDA
SCL
INT2
GND
4
GND
4
5
TDFN2x3-8L
SOIC-8L
TSSOP-8L
TDFN4x4-8L
Pin Description
Pin No.
43390 43390C
Pin
Name
INT1
XOUT
NC1
XIN
NC2
VSS
INT2
SCL
Type
Description
Output for Interrupt Signal 1.
This pin outputs a signal of interrupt, or a clock pulse. By
using the status register 2, users can select either of: alarm 1 interrupt, output of user-set
frequency, per-minute edge interrupt, minute-periodical interrupt 1, minute-periodical
interrupt 2, or 32.768 kHz output. This pin has NCH open drain output.
Oscillator Circuit Output.
Together with X1, 32.768kHz crystal is connected between
them. When 32.768kHz external input, X2 must be float.
No connected.
Oscillator Circuit Input.
Together with X1, 32.768kHz crystal is connected between
them. Or external clock input.
No connected.
Negative power supply pin.
Connects to GND.
Output for Interrupt Signal 2.
This pin outputs a signal of interrupt, or a clock pulse. By
using the status register 2, users can select either of: alarm2 interrupt, output of user-set
frequency, or minute-periodical interrupt 1. This pin has NCH open drain output.
Serial clock input pin.
This pin is to input a clock pulse for I
2
C-bus interface. The SDA
pin inputs/outputs data by synchronizing with the clock pulse.
Serial Data Input/Output.
This is a data input / output pin of I
2
C-bus interface. This pin
inputs / outputs data by synchronizing with a clock pulse from the SCL pin. This pin has
CMOS input and NCH open drain output. Generally in use, pull up this pin to the V
DD
potential via a resistor, and connect it to any other device having open drain or open
collector output with wired-OR connection.
Positive power supply pin.
Connect this VDD pin with a positive power supply.
1
2
-
3
-
4
5
6
1
-
2
-
3
4
5
6
O
O
-
I
-
P
O
I
7
8
7
8
SDA
I/O
VDD
P
2015-12-0001
2
PT0280-8
12/11/15
PT7C43390/43390C
Real-time Clock Module
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Block Diagram
XIN
XOUT
Oscillator
Divider,
Timing generator
INT1
INT register 1
INT controller 1
Clock correction register
Status register 1
Status register 2
Free register
VDD
Low power supply
voltage detector
Power-on
detection circuit
Constant-voltage
circuit
VSS
Comparator 1
Real-time data register
Second Minute Hour
Day of
Week
Day
Month
Year
Comparator 2
INT2
INT controller 2
SDA
SCL
INT register 2
INT register 2
Serial
interface
PT7C43390
XOUT
32.768
kHz
XIN
C
D
Oscillator
Divider,
Timing generator
INT1
INT register 1
INT controller 1
C
G
Clock correction register
Status register 1
Status register 2
Free register
VDD
Low power supply
voltage detector
Power-on
detection circuit
Constant-voltage
circuit
VSS
Comparator 1
Real-time data register
Second Minute Hour
Day of
Week
Day
Month
Year
Comparator 2
INT2
INT controller 2
SDA
SCL
INT register 2
INT register 2
Serial
interface
PT7C43390C
2015-12-0001
3
PT0280-8
12/11/15
PT7C43390/43390C
Real-time Clock Module
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Maximum Ratings
Storage Temperature.................................................................................... -55oC to +125oC
Operating Temperature..................................................................................-40oC to +85oC
Power Supply Voltage........................................................................Vss-0.3V to Vss+6.5V
DC Input Voltage(SCL, SDA) .........................................................Vss-0.3V to Vss+6.5V
DC Output Voltage(SDA, INT1, INT2) .......................................Vss-0.3V to Vss+6.5V
Power Dissipation
..........................................................
250mW (depend on package)
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 conditions
above those indicated in the operational sections of
this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may
affect reliability.
Recommended Operating Conditions
Symbol
V
DD
T
opr
V
DDT
V
DDR
V
DET
C
L
Parameter
Power supply voltage
Operating temperature
Time keeping voltage range
Register hold voltage
Power supply voltage detection voltage
*1
Crystal oscillator C
L
value
CONDITIONS
T
A
= −40 to +85°C
V
DD
=1.3 to 5.5 V
T
A
= −40 to +85°C
T
A
= −40 to +85°C
T
A
= −40 to +85°C
-
Min
1.35
−40
1.25
0.9
0.70
-
Typ
3.0
+25
-
-
1.05
6
Max
5.5
+85
5.5
5.5
1.40
12.5
Unit
V
°
C
V
V
V
pF
*1. Power supply voltage detection voltage: Constantly maintains the relation of V
DET
> V
DDRM
(minimum data hold voltage).
Oscillation Characteristics
(For PT7C43390: T
A
= 25° V
DD
= 3.0 V, V
SS
= 0 V, crystal oscillator (C
L
= 6pF, 32.768 kHz).)
C,
Symbol
V
STA
-
δIC
δV
Parameter
Oscillation start voltage
Oscillation start time
IC to IC frequency deviation
Frequency voltage deviation
Conditions
Within 10 seconds
-
-
V
DD
=1.35 to 5.5 V
Min.
1.1
-
-10
-3
Typ.
-
-
-
-
Max.
5.5
3
+10
+3
Unit
V
s
ppm
ppm
(For PT7C43390C: T
A
= 25° V
DD
= 3.0 V, V
SS
= 0 V.)
C,
Symbol
V
STA
-
δIC
f
/ f
δV
fa
Parameter
Oscillation start voltage
Oscillation start time
IC to IC frequency deviation
Frequency tolerance
Frequency voltage deviation
Aging
Conditions
Within 10 seconds
-
-
-
VDD =1.3 to 5.5 V
First year
Min.
1.1
-
-10
-30
-3
Typ.
-
-
-
-
Max.
5.5
3
+10
+30
+3
±5
Unit
V
s
ppm
ppm
ppm
ppm/year
2015-12-0001
4
PT0280-8
12/11/15
PT7C43390/43390C
Real-time Clock Module
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DC Electrical Characteristics
( T
A
= -40° to +85° V
SS
= 0V, crystal oscillator C
L
= 6pF, 32.768KHz, unless otherwise noted.)
C
C;
Pin
Symbol
Parameter
Test Conditions
Min
V
DD
= 3.0V
I
DD1
I
DD2
I
IZH
I
IZL
I
OZH
I
OZL
V
IH
V
IL
I
OL1
I
OL2
I
DD1
I
DD2
I
IZH
I
IZL
I
OZH
I
OZL
V
IH
V
IL
I
OL1
I
OL2
Current consumption 1
Current consumption 2
Input high leakage current
Input low leakage current
Output high leakage current
Output low leakage current
Input high voltage
Input low voltage
Output low current 1
Output low current 2
Current consumption 1
Current consumption 2
Input high leakage current
Input low leakage current
Output high leakage current
Output low leakage current
Input high voltage
Input low voltage
Output low current 1
Output low current 2
VDD
VDD
SCL,SDA
SCL,SDA
SDA,INT1,
INT2
SDA,INT1,
INT2
SCL,SDA
SCL,SDA
INT1
INT2
SDA
VDD
VDD
SCL,SDA
SCL,SDA
SDA,INT1,
INT2
SDA,INT1,
INT2
SCL,SDA
SCL,SDA
INT1
INT2
SDA
V
OUT
= 0.4V
Out of communication
During communication
(SCL=100kHz)
V
IN
= V
DD
V
IN
= V
SS
V
OUT
= V
DD
V
OUT
= V
SS
-
-
V
OUT
= 0.4V
V
OUT
= 0.4V
V
OUT
= 0.4V
Out of communication
During communication
(SCK=100kHz)
V
IN
= V
DD
V
IN
= V
SS
V
OUT
= V
DD
V
OUT
= V
SS
-
-
V
OUT
= 0.4V
-
-
-0.5
-0.5
-0.5
-0.5
0.8V
DD
-
1.0
5
5
-
-
-0.5
-0.5
-0.5
-0.5
0.8V
DD
-
1.0
6
6
0.3
3.5
-
-
-
-
-
-
1.6
8
8
0.35
7
-
-
-
-
-
-
1.6
10
10
0.6
8
+0.5
+0.5
+0.5
+0.5
-
0.2V
DD
-
-
-
0.7
14
+0.5
+0.5
+0.5
+0.5
-
0.2V
DD
-
-
-
µA
µA
µA
µA
µA
µA
V
V
mA
mA
mA
µA
µA
µA
µA
µA
µA
V
V
mA
mA
mA
Typ
Max
Unit
V
DD
= 5.0V
2015-12-0001
5
PT0280-8
12/11/15
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