Real time clock module
Actual size
Block diagram
Overview
BUS
INTERFACE
CIRCUIT
CE 1
CLK
DATA
32.768 kHz
CE 0
CONTROL
REGISTER
SHIFT REGISTER
A
LARM REGISTER
TIMER REGISTER
CLOCK and
CALENDAR
INTERRUPTS
CONTROLLER
OUTPUT
CONTROLLER
DIVIDER
CONTROL LINE
FOUT
/ TIRQ
/ AIRQ
OSC
FCON
32.768 kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• Output frequency is selectable from 1/30Hzto 32.768kHz
(32 Values)
Timer function
• Timer function which can be set up between
1/4096 second and 255 minutes.
• It is recorded automatically to TF-bit at the time of event
occurrence, and it’s possible to output with /TIRQ pin output
(open-drain output).
• Selectable one time mode or repeat mode.
Alarm function
• Alarm function can be set to any combination of day of
week, hour, or minute.
•It is recorded automatically to AF-bit at the time of event
occurrence, and it’s possible to output with /AIRQ pin output
(open-drain output).
Functions are compatible with RTC-4574SA/JE/NB.
Pin Function
T erminal connecti on
/
External dime nsion
s
(
Unit:mm
)
Signal Nam e Input / Ou tp ut Function
CE0 Input
The chip enabled input pin 0. (Built-i n pull-d own resi st ance)
When both CE0 and CE1 pins are at the “H” level , access to this
Real time clock module becomes possible.
CE1 Input
The chip enabled input pin 1.
W hen t he CE1 pin is at the HI GH l e vel , the FOUT pin is in th e out put sta te.
CLK Input The shift clock input pin for serial data transfer.
DATA Bi-directional The data input / output pin for serial data transfer.
FOUT Output
This pin outputs the reference clock signal at 32.768 kHz ( C-MOS output ).
High impedance at the time of output off.
FCON Input The input pin for the FOUT output control.
/ AIRQ Output The open drain output pin for alarm and tim e update interrupts.
/ TIRQ Output The open drain output pin for timer interrupt.
VDD
-
Connected to a positive power supply.
GND
-
Connected to a ground.
RX4574LC
1. N.C. 12. VDD
2. N.C. 11. CE1
3. /TIRQ 10. CLK
4. /AIRQ 9. DATA
5. FCON 8. CE0
6. FOUT
0.5
2.4
3.6
1.2Max.
2.8 7. GND
VSOJ12pin
S
p
ecifications
(
characteristics
)
Refer to a
pp
lication manual for details.
Recommended Operating Conditions
Item Symbol Conditions Min. T yp. Max. Unit
Power voltage VDD
-
1.6 3.0 5.5 V
Clock voltag e VCLK
-
1.3 3.0 5.5 V
Operating
temperature TOPR
-
-40 +25 +85
C
Frequency characteristics
Item Symbol Conditions Rating Unit
Frequency
tolerance f/f Ta=+25C
VDD=3.0V 523* 106
Oscillation
Start-up time tSTA
Ta=+25C
VDD=1.6V 1Max. s
Ta=-40Cto+85
C
VDD=1.6V 3Max. s
*Equivalent to 1 minute of monthly deviation
Current consumption characteristics Ta=40Cto+85C
Item Symbol Conditions Min. Typ. Max. Unit
Current
Consumption
IBK CE0,CE1=GND
FOUT;output OFF
(Hi-z)
VDD
=5V
0.45 0.9
µA
VDD
=3V
0.35 0.7
I32k
CE0=GND
CE1=VDD
FOUT;
32.768kHz output ON
CL=30pF
VDD
=5V
8.0 20.0
µA
VDD
=3V
5.0 12.0
Small size, low profile model package
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RX - 4574LC
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type : 3-wire serial interface
Operating voltage range : 1.6Vto5.5V
Wide Timekeeper voltage range : 1.3Vto5.5V
Low backup current : 0.35A/3V(Typ.)
32.768 kHz frequ ency output fun ction : C-MOS output With Contr ol Pin
The various functions include full calendar, alarm, timer.
Product Number (Please contact us)
RX-4574LC : Q414574C2000300
*Stop using the glue
Any glue mus t never use it after s oldering LC-pack age to a circuit board.This product
has glass on t he back side of a package.When glue i nvasions between circ uit board
side and glass side, then glass cracks by thermal expansion of glue.In this case a
crystal oscillation stops.Consider glue abolition or glue do not touch to LC-package
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