The PT7C4563 serial real-time clock is a low-power
clock/calendar with a programmable square-wave output.
Address and data are transferred serially via a 2-wire
bidirectional 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 the 24-
hour format indicator.
Table 1 shows the basic functions of PT7C4563. More
details are shown in section: overview of functions.
Programmable square wave output signal
Oscillator stop flag
Low backup current: typ. 400nA at V
DD
=3.0V and
T
A
=25
°
C
Operating range: 1.3V to 5.5V
Table 1.
Basic functions of PT7C4563
Item
1
Oscillator
Function
PT7C4563
-
-
-
1, 32, 1.024k, 32.768k
-
Source: Crystal: 32.768kHz
Oscillator enable/disable
Oscillator fail detect
Time display
2
Time
Century bit
Time count chain enable/disable
3
4
5
Interrupt
Communicati
on
Alarm interrupt
2-wire I
2
C bus
Burst mode
Programmable square wave output (Hz)
12-hour
24-hour
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PT0333-5
1
PT7C4563
Pin Configuration
PT7C4363
1
X1
VCC
8
2
X2
INT
SQW
7
SCL
6
3
4
GND
SDA
5
SOIC-8, MSOP-8,
DIP-8
TSSOP-8, TDFN-8
SOIC-8
TSSOP-8
Pin Description
Pin no.
1
Pin
X1
Type
I
Description
Oscillator Circuit Input.
Together with X2, 32.768kHz crystal is connected between them.
2
X2
O
Oscillator Circuit Output.
Together with X1, 32.768kHz crystal is connected between them.
3
INT
O
Interrupt Output.
Open drain, active low.
4
GND
P
Ground.
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.
Serial Clock Input.
SCL is used to synchronize data movement on the I
2
C serial interface.
Clock Output.
Open drain. Four frequencies selectable: 32.768k, 1.024k, 32, 1Hz when SQWE
bit is set to 1.
Power.
5
6
7
SDA
SCL
SQW
I/O
I
O
8
VCC
P
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PT0333-5
2
PT7C4563
Function Block
PT7C4363
X1
32.768
kHz
C
D
Comparator
Alarm Register
(Min, Hour, Day, Date)
OSC
Counter Chain
Time Counter
(Sec,Min,Hour,Day,Date,Month,Year)
X2
C
G
Control Register
Address
Decoder
Address
Register
I /O
Interface
(I
2
C)
Shift Register
SCL
INT
SQW
Alarm Interrupt Control
Square Wave Output Control
SDA
Note:
Built in C
D
=C
G
=12pF
Maximum Ratings
Storage Temperature ...............................................................................................................-65oCto +150oC
Ambient Temperature with Power Applied ......................................................................-40oCto +85oC
Supply Voltage to Ground Potential (Vcc to GND) ..................................................... -0.3V to +6.5V
DC Input (All Other Inputs except Vcc & GND)........................................................... -0.3V to (V
cc
+0.3V)
DC Output Voltage (SDA, /INTA, /INTB pins) ..............................................................-0.3V to +6.5V
Power Dissipation ....................................................................................................................320mW (Depend on package)
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 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
CC
V
IH
V
IL
T
A
Power voltage
Input high level
Input low level
Operating temperature
Description
Min.
1.3
0.7 V
CC
-0.3
-40
Typ.
-
-
-
-
Max.
5.5
V
CC
+0.3
0.3 V
CC
85
º
C
V
Unit
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PT0333-5
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PT7C4563
DC Electrical Characteristics
Unless otherwise specified, GND =0V, V
CC
= 1.3 ~ 5.5 V, T
A
= -40 ° to +85 ° f
OSC
= 32.768kHz.
C
C,
Sym.
Description
Supply voltage
V
CC
Supply voltage for clock
data integrity
Pin
V
CC
V
CC
Conditions
Interface inactive. T
A
= 25°
1)
C
Interface active. f
SCL
= 400kHz , T
A
= 25°
1)
C
-
Interface active
Interface inactive (f
SCL
= 0Hz),
V
CC
pin 7 disabled T
A
=-40~85°
C
Interface inactive (f
SCL
= 0Hz),
pin 7 enabled at 32kHz T
A
=-
40~85°
C
SCL
-
SCL
-
SDA
V
OL
= 0.4V, V
CC
= 5V
/INT, SQW V
OL
= 0.4V, V
CC
= 5V
SCL
-
-
f
SCL
= 400kHz
f
SCL
= 100kHz
V
CC
= 5.0V
V
CC
= 3.0V
V
CC
= 5.0V
V
CC
= 3.0V
Min.
1.1
1.3
1.1
-
-
-
-
-
-
0
0.7V
CC
-3
-1
-
-
Typ.
-
-
-
-
-
450
400
650
600
-
-
-
-
-
-
Max.
5.5
5.5
5.5
35
15
850
650
1200
850
0.3V
CC
V
CC
-
-
1
1
A
nA
Unit
V
I
CC
Supply current
nA
V
IL1
Low-level input voltage
V
IH1
High-level input voltage
I
OL
I
IL
I
OZ
Low-level output voltage
Input leakage current
V
mA
A
A
Output current when OFF -
Note:
1) For reliable oscillator start-up at power-up: V
CC(min)power-up
= V
CC(min)
+ 0.3 V.
AC Electrical Characteristics
Sym
V
HM
V
HL
Description
Rising and falling threshold voltage high
Rising and falling threshold voltage low
Value
0.8 V
CC
0.2 V
CC
Unit
V
V
Signal
V
HM
V
LM
t
f
t
r
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2016-10-0003
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PT0333-5
4
PT7C4563
Over the operating range
Symbol
f
SCL
t
SU;STA
t
HD;STA
t
SU;DAT
t
HD;DAT1
t
HD;DAT2
t
SU;STO
t
BUF
t
LOW
t
HIGH
t
r
t
f
t
SP
*
C
B
SCL clock frequency
START condition set-up time
START condition hold time
Data set-up time (RTC read/write)
Data hold time (RTC write)
Data hold time (RTC read)
STOP condition setup time
Bus idle time between a START and STOP condition
When SCL = "L"
When SCL = "H"
Rise time for SCL and SDA
Fall time for SCL and SDA
Allowable spike time on bus
Capacitance load for each bus line
Item
Min.
-
0.6
0.6
200
35
0
0.6
1.3
1.3
0.6
-
-
-
-
Typ.
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Max.
400
-
-
-
-
-
-
-
-
-
0.3
0.3
50
400
Unit
kHz
s
s
ns
ns
s
s
s
s
s
s
s
ns
pF
* Note:
Only reference for design.
S
SCL
t
LOW
f
SCL
t
HIGH
Sr
t
HD;STA
t
SP
P
t
SU;STA
t
BUF
SDA
t
HD;STA
t
SU;DAT
t
HD;DAT
t
SU;STA
t
SU;STO
t
HD;STA
S
Sr
Start condition
Restart condition
P
Stop condition
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