Actual size
Real time clock module
Block diagram
Overview
32kHz
OUTPUT
CONTROL
OSC
COMPARATOR_D
ALARM_D REGISTER
(MIN,HOUR)
ADDRESS
DECODER
ADDRESS
REGISTER
VOLTAGE
DETECT
DIV
TIME COUNTER
(SEC,MIN,HOUR,WEEK,DAY,MONTH,YEAR)
SHIFT REGISTER
I/O
CONTROL
FOUT
INTERRUPT CONTROL
CLK
DIVIDER
CORREC
-TION
VDD
GND
COMPARATOR_W
ALARM_W REGISTER
(MIN,HOUR, WEEK)
CE
OSC
DETECT
DI
/INT
DO
 Features built-in 32.768kHz crystal unit
▪Frequency adjusted forhigh accuracy
(5106 /Ta=+25C)
(Equivalent to 13 seconds of monthly deviation)
 The various detection Function
▪Power supply voltage monitoring function
(with selectable detection threshold)
▪Stop detection function
▪Power-on reset detection function
Equipped with alarm and timer
▪Timer function produces a periodic interruption signal.
As for the Alarm function an optional combination is
produced. (Date of the week , time , minute)
Pin function
Terminal connection/External dimensions
(Unit:mm)
Signal
Name
Input /
Output
Function
CE
Input
The chip enabled input pin.
( built -in pull-down resistance )
At the "H"level, access becomes possible.
CLK
Input
The shift clock input pin for serial data transfer.
DI
Input
The data input pin for serial data transfer.
DO
Output
The data output pin for serial data transfer.
FOUT
Output
32.768kHzclock output pin with the output control
function (N-ch open drain)
High impedance at the time of output off.
/ INT
Output
Interrupt output (N-ch open drain)
TEST
-
Used by the manufacturer for testing.
(Do not connect externally.)
VDD
-
Connected to a positive power supply.
GND
-
Connected to a ground.
RX4045SA
1.
N.C.
14.
N.C.
2.
CLK
13.
DO
3.
FOUT
12.
DI
4.
N.C.
11.
GND
5.
TEST
10.
/INT
6.
VDD
9.
N.C.
7.
CE
10.1 0.2
5.0
7.40.2
3.20.1
1.27
8.
N.C.
SOP14 pin
RX4045NB
1.
CE
22.
N.C.
2.
VDD
21.
N.C.
3.
(GND)
20.
N.C.
4.
TEST
19.
N.C.
5.
FOUT
18.
N.C.
6.
CLK
17.
N.C.
7.
DO
16.
N.C.
8.
DI
15.
N.C.
9.
GND
14.
N.C.
10.
/INT
13.

11.
N.C.
4.8
6.3Max.
5.00.2
0.5
1.30.1
12.

SON22 pin
 Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
Specifications (characteristics)
 Refer to application manual for details.
Recommended Operating Conditions
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Power voltage
VDD
-
1.7
3.0
5.5
V
Clock voltage
VCLK
-
1.15
3.0
5.5
V
Operating
temperature
TOPR
-
-40
+25
+85
C
Frequency characteristics
Item
Symbol
Condition
Rating
Unit
Frequency
tolerance
f/f
Ta=+25°C
VDD=3.0V
AA: 551)
AC: 052)
106
Oscillation
start-up time
tSTA
Ta=+25°C
VDD=2.0V
1Max.
s
Frequency / voltage
characteristics
f/V
Ta=+25°C
VDD=2.0Vto5.5V
1Max.
106
1)2) Equivalent to 13 seconds of monthly deviation (excluding offset.)
Current consumption characteristics
Ta=40Cto+85C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
VDD
=5V
0.60
1.80
IBK
CE=GND
FOUT;output OFF
(Hi-z)
VDD
=3V
0.48
1.20
µA
Current
Consumption
I32k
CE=GND
FOUT;32.768kHz
output ON
VDD
=3V
0.65
2.00
µA
Power supply detection voltage
Ta=30Cto+70C
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
High-voltage mode
VDETH
VDD pin
1.90
2.10
2.30
V
Low-voltage mode
VDETL
VDD pin
1.15
1.30
1.45
V
RX-4045SA
RX-4045NB
High-Stability Frequency
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RX-4045SA/NB
Built-in 32.768 kHz crystal unit : Frequency adjusted for high accuracy.
(5106/Ta=+25C)
Interface Type : 4-wire serial interface
Operating voltage range : 1.7Vto5.5V
Wide Timekeeper voltage range : 1.15Vto5.5V
Various detection Functions : Oscillation stop detection function etc.
Low backup current : 0.48A/3V(Typ.)
32.768 kHz clock frequency output : N-ch open drain output
Function of time and calendar, the various detection function,
and interrupt function etc.
Product Number (Please contact us)
RX-4045SA : Q41404552xxxx00
RX-4045NB : Q41404592xxxx00