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PT7C43190
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
3-wire (micro wire) 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
Package: SOIC-8L, TSSOP-8L, and TDFN2x3-8L
Description
The PT7C43190 is a CMOS 3-wire 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
Function Table
Item
1
2
3
Function
Oscillator Source
Time
Interrup
t
Time
display
Crystal
*
12-hour
24-hour
PT7C43190
2
1Hz,2Hz,4Hz
8Hz,16Hz
32kHz
3
2
Alarm interrupt pin output
Timer interrupt output
Mobile game device
Digital still camera
Digital video camera
Electronic power meter
DVD recorder
TV, VCR
Mobile phone, PHS
4
Programmable square wave output
(Hz)
Commu
nication
3-wire bus
Burst mode
IC test mode
Power-on detector
Power supply voltage
detector
Pin Configuration
PT7C43190
1
5
INT
XOUT
XIN
VDD
8
SIO
7
6
Control
4
SCK
CS
6
7
80
Clock calibration
Free register access
VSS
5
SOIC-8
TSSOP-8
DFN2*3
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Pin Description
Pin
No.
Pin
Name
Type
Description
Output for Interrupt Signal.
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, alarm 2 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.
Oscillator Circuit Input.
Together with X1, 32.768kHz crystal is connected between them. Or external
clock input.
Negative power supply pin.
Connects to GND.
Chip select input pin.
This pin is to input chip select, has a pull-down resistor. Communication is
available when this pin is in "H". If not using communication, set this pin "L" or open.
Serial clock input pin.
This pin is to input a clock pulse for serial interface. When the CS pin is in "H",
the SIO pin inputs / outputs data by synchronizing with the clock pulse. When the CS pin is in "L" or
open, the SCK pin does not accept inputting a clock pulse.
Serial Data I/O pin.
This pin is a data input / output pin of serial interface. When the CS pin is in "H",
the SIO pin inputs / outputs data by synchronizing with a clock pulse from the SCK pin. The status is in
"High-Z" when the CS pin is in "L" or open, so that the chip does not transmit data. Setting the CS pin to
"H" from "L" or open, this SIO pin goes in the input status so that it receives the command data. This pin
has CMOS input and NCH open drain output.
Positive power supply pin.
Connect this VDD pin with a positive power supply.
1
2
3
4
5
6
INT
XOUT
XIN
VSS
CS
SCK
O
O
I
P
I
I
7
8
SIO
I/O
VDD
P
Block Diagram
XIN
XOUT
Oscillator
Divider,
Timing generator
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
INT
Comparator 1
Real-time data register
Second Minute Hour
Day of
Week
Day
Month
Year
Comparator 2
INT register 2
INT controller 2
SIO
SCK
CS
INT register 2
Serial
interface
PT7C43190
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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(CS, SCK, SIO)...................................................Vss-0.3V to Vss+6.5V
DC Output Voltage(SIO, 32KO, SDA, INT) ..............................Vss-0.3V to Vss+6.5V
Control Input Voltage (EN)
....................................................................
-0.5V to+6.0V
Power Dissipation
.............................................................................................
250mW
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
V
DD
T
OPR
V
DDT
V
DDR
Parameter
Power supply voltage
Operating temperature
Time keeping voltage range
Register data hold voltage
CONDITIONS
T
A
= −40 to +85°C
V
DD
=1.35 to 5.5 V
T
A
= −40 to +85°C
T
A
= −40 to +85°C
-
Min
1.35
−40
1.25
0.9
-
Typ
3.0
+25
-
-
6
Max
5.5
+85
5.5
5.5
12.5
Unit
V
°
C
V
V
pF
C
L
Crystal oscillator C
L
value
Note*:
Reference value
Oscillation Characteristics
(T
A
= 25° V
DD
= 3.0 V, V
SS
= 0 V, crystal oscillator (C
L
= 6 pF, 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
=1.3 to 5.5 V
Min.
1.1
-
-10
-3
Typ.
-
-
-
-
Max.
5.5
3
+10
+3
Unit
V
s
ppm
ppm
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DC Electrical Characteristics
(T
A
= -40° to +85° V
SS
= 0V, crystal oscillator C
L
= 6pF, 32.768 KHz, unless otherwise noted.)
C
C;
Pin
Symbol
Parameter
Test Conditions
Min
V
DD
= 3.0V
I
DD1
I
DD2
I
IZH
I
IZL
I
I1
I
I2
I
I3
I
OZH
I
OZL
V
IH
V
IL
I
OL1
I
OL3
Current consumption 1
Current consumption 2
Input high leakage current
Input low leakage current
Input current 1
Input current 2
Input current 3
Output high leakage current
Output low leakage current
Input high voltage
Input low voltage
Output low current 1
Output low current 2
V
DD
V
DD
SCK,SIO
SCK,SIO
CS
CS
CS
SIO,INT,32kO
SIO,INT,32kO
SCK,SIO,CS
SCK,SIO,CS
INT, 32kO
SIO
-
V
DD
V
DD
SCK,SIO
SCK,SIO
CS
CS
CS
SIO,INT,32kO
SIO,INT,32kO
SCK,SIO,CS
SCK,SIO,CS
INT, 32kO
SIO
Out of communication
During communication
(SCK=100kHz)
V
IN
= V
DD
V
IN
= V
SS
V
IN
= V
DD
V
IN
= 0.4V
V
IN
= 1.0V
V
OUT
= V
DD
V
OUT
= V
SS
-
-
V
OUT
= 0.4V
V
OUT
= 0.4V
-
Out of communication
During communication
(SCK=100kHz)
V
IN
= V
DD
V
IN
= V
SS
V
IN
= V
DD
V
IN
= 0.4V
V
IN
= 1.0V
V
OUT
= V
DD
V
OUT
= V
SS
-
-
V
OUT
= 0.4V
V
OUT
= 0.4V
-
-
-0.5
-0.5
-
-
-
-0.5
-0.5
0.8
V
DD
-
1.0
5
0.70
-
-
-0.5
-0.5
-
-
-
-0.5
-0.5
0.8
V
DD
-
1.0
6
0.3
2.5
-
-
0
1.3
2.6
-
-
-
-
1.4
10
1.05
0.35
5.0
-
-
0
2.3
5.0
-
-
-
-
1.4
13
0.6
8
+0.5
+0.5
-
-
-
+0.5
+0.5
-
0.2
V
DD
-
-
1.40
0.7
14
+0.5
+0.5
-
-
-
+0.5
+0.5
-
0.2
V
DD
-
-
uA
uA
uA
uA
uA
uA
uA
uA
uA
Typ
Max
Unit
mA
mA
V
uA
uA
uA
uA
uA
uA
uA
uA
uA
V
DET
Power supply voltage detection voltage *1
V
DD
= 5.0V
I
DD1
I
DD2
I
IZH
I
IZL
I
I1
I
I2
I
I3
I
OZH
I
OZL
V
IH
V
IL
I
OL1
I
OL3
Current consumption 1
Current consumption 2
Input high leakage current
Input low leakage current
Input current 1
Input current 2
Input current 3
Output high leakage current
Output low leakage current
Input high voltage
Input low voltage
Output low current 1
Output low current 2
mA
mA
V
DET
Power supply voltage detection voltage *1
-
-
0.70
1.05
1.40
V
Note:
*1.
Power supply voltage detection voltage: Constantly maintains the relation of V
DET
> V
DDRM
(minimum register data hold
voltage).
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AC Electrical Characteristics
Measure conditions
Input pulse voltage
Input pulse rise/fall time
Output determination voltage
Output load
V
IH
= 0.8 × V
DD
, V
IL
= 0.2 × V
DD
20ns
V
OH
= 0.8 × V
DD
, V
OL
= 0.2 ×V
DD
80pF + pull-up resistance 10kΩ
Symbol
t
SCK
t
DS
t
CSH
t
ISU
t
IHO
t
ACC
t
CSS
t
DH
t
R
, t
F
Parameter
Clock pulse width
Setup before CS rise
Hold time after CS rise
Input setup time
Input data hold time
Output definition time
*1
Setup before CS fall
Hold time after CS fall
Input rise/fall time
V
DD
= 1.35 to 3.0 V (V
DD
= 3.0 V)
Min.
5
1
1
1
1
-
1
1
-
Typ.
-
-
-
-
-
-
-
-
-
Max.
250000
-
-
-
-
3.5
-
-
0.1
V
DD
= 1.35 to 5.5 V (V
DD
= 5.5 V)
Min.
1
0.2
0.2
0.2
0.2
-
0.2
0.2
-
Typ.
-
-
-
-
-
-
-
-
-
Max.
250000
-
-
-
-
-
-
-
0.05
Unit
μs
μs
μs
μs
μs
μs
μs
μs
μs
*1. Since the output format of the SIO pin is Nch open-drain output, output data definition time is determined by the values of the
load resistance (R
L
) and load capacity (C
L
) outside the IC. Therefore, use this value only as a reference value.
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