Real time clock module
Epson Toyocom
Product Number (Please contact us)
RTC-4543SA : Q41454351000200
RTC-4543SB : Q41454361000200
Simple Function
SERIAL-INTER FACE REA L TIME C LOCK MODULE
RTC - 4543 SA
/
SB
•Built
in frequency adjusted 32.768 kHz crystal unit.
•Interface
type
: 3-wire
serial interface
•Operating
voltage range
:
2.5 V to 5.5 V
•Wide
Timekeeper voltage range: 1.4 V to 5.5 V
•32.768
kHz frequency output function: C-MOS output With Control Pin
•The
various functions include full calendar, timer, and low voltage detection.
Actual size
RTC-4543SA
RTC-4543SB
Block diagram
32.768 kHz
Overview
•
32.768 kHz frequency output function
CLOCK AND
CALENDAR
OSC
DIVIDER
•FOUT pin output (C-MOS output ), CL=30 pF
•FOE pin enables output on/off control.
•FSEL pin enables output selectable 32.768 kHz or 1 Hz.
•
Power supply voltage monitoring function
FOUT
FSEL
FOE
OUTPUT
CONTROLLER
SHIFT REGISTER
•Detection that power supply voltage descended to 1.7 V or less.
•Automatic record to FDT-bit at the time of power supply
decline detection.
VOLTAGE
DATA
CLK
WR
CE
I/O
CONTROLLER
DETECT
CONTROL
CIRCUIT
Pin Function
Signal Name Input / Output
Terminal connection / External dimensions
Function
The chip enabled input pin.
At the HIGH level, access becomes possible.
The shift clock input pin f or serial dat a transfer.
DATA pin input / output switching pin.
(Unit:mm)
RTC
−
4543 SA
1.27
RTC
−
4543 SB
1.27
CE
CLK
WR
DATA
FOUT
FOE
FSEL
V
DD
GND
Input
Input
Input
1.
2.
3.
4.
5.
6.
7.
GND
N.C.
CE
FSEL
14.
10.1
±
0.2
FOUT
N.C.
N.C.
DATA
CLK
V
DD
N.C.
1.
2.
3.
N.C.
N.C.
N.C.
N.C.
FOE
WR
FSEL
CE
GND
18.
17.
11.4
±
0.2
N.C.
N.C.
N.C.
N.C.
V
DD
N.C.
CLK
DATA
FOUT
13.
12.
11.
16.
15.
14.
Bi-directional The data input / output pin for serial data transfer.
Output
Input
Input
-
-
32.768 kHz or 1Hz clock output pin
(C-MOS output).
High impedance at output off.
The input pin f or the FOUT output control.
Select t he frequency that is output from the
FOUT pin.
Connected to a positive power supply.
Connected to a ground.
4.
5.
6.
7.
8.
5.0
WR
3.2
±
0.1
10.
9.
8.
5.4
2.0
Ma x.
13.
12.
11.
FOE
N.C.
7.4
±
0 .2
9.
7.8
±
0.2
10.
SOP
−
14 pin
SOP
−
18 pin
Metal may be exposed on the top or bottom of this product. This w ill not affect any quality, reliability or electrical spec.
Specifications (characteristics)
!
Recommended Operating Conditions
Item
Power voltage
Clock voltage
Operating
temperature
*
Refer to application Manual for details.
!
Current consumption characteristics
Typ.
5.0
5.0
+25
Max.
5.5
5.5
+85
Unit
V
V
°C
Current
Consumption
T
a
= -40
°C
to +85
°C
Symbol
V
DD
V
CLK
T
OPR
Condition
-
-
-
Min.
2.5
1.4
-40
Item
Symbol
Condition
V
DD
=5V
V
DD
=3V
V
DD
=2V
Min.
Typ.
1.5
1.0
0.5
Max.
3.0
2.0
1.0
Unit
I
BK
CE = GND
FOE = GND
FOUT ;output OFF
(Hi-z)
µA
!
Frequency characteristics
Item
Frequency
tolerance
Oscillation
start-up time
Symbol
∆
f/f
Condition
T
a
= +25 °C
V
DD
= 5.0 V
T
a
= +25 °C
V
DD
= 2.5 V
Rating
5
±
23
∗
3 Max.
Unit
×
10
−
6
s
!
Supply Voltage Detection Characteristic
Item
Power supply
detection voltage
T
a
= -40
°
C to +85
°
C
t
STA
Symbol
V
DT
Condition
V
DD
pin
Min.
1.4
Typ.
1.7
Max.
2.0
Unit
V
∗
Please ask for tighter tolerance.(Equivalent to 1 minute of monthly deviation )
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