RX-4574LC Datasheet, PDF (1/2 Pages) Epson ToYoCom – SERIAL-INTERFACE REAL TIME CLOCK MODULE

Real time clock module
REAL TIME CLOCK MODULE (SPI-Bus)
RX - 4574LC
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type
: 3-wire serial interface
Operating voltage range
: 1.6Vto5.5V
Wide Timekeeper voltage range : 1.3Vto5.5V
Low backup current
: 0.35A/3V(Typ.)
32.768 kHz frequency output function : C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
Actual size
Product Number (Please contact us)
RX-4574LC : Q414574C2000300
Block diagramç
ç ç ç Overviewç
ç
FOUT
FCON
/ TIRQ
/ AIRQ
DATA
CLK
CE 1
CE 0
32.768 kHz
OSC
DIVIDER
OUTPUT
CONTROLLER
INTERRUPTS
CONTROLLER
BUS
INTERFACE
CIRCUIT
CONTROL LINE
CLOCK and
CALENDAR
TIMER
REGISTER
ALARM
REGISTER
CONTROL
REGISTER
SHIFT REGISTER
32.768 kHz frequency output function
• FOUT pin output (C-MOS output), CL=30 pF
• Output frequency is selectable from 1/30Hzto 32.768kHz
(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-4574SA/JE/NB.
Pin Functionç
Signal Name Input / Output
CE0
Input
CE1
CLK
DATA
FOUT
FCON
/ AIRQ
/ TIRQ
VDD
GND
Input
Input
Bi-directional
Output
Input
Output
Output
-
-
Function
The chip enabled input pin 0. (Built-in pull-down resistance)
When both CE0 and CE1 pins are at the “H” level , access to this
Real time clock module becomes possible.
The chip enabled input pin 1.
When the CE1 pin is at the HIGH level, the FOUT pin is in the output state.
The shift clock input pin for serial data transfer.
The data input / output pin for serial data transfer.
This pin outputs the reference clock signal at 32.768 kHz ( C-MOS output ).
High impedance at the time of output off.
The input pin for the FOUT output control.
The open drain output pin for alarm and time update interrupts.
The open drain output pin for timer interrupt.
Connected to a positive power supply.
Connected to a ground.
ç ç ç Terminal connection/External dimensionsç (Unit:mm)ç
RX4574LC
1. N.C.
2. N.C.
3. /TIRQ
4. /AIRQ
5. FCON
6. FOUT
12. VDD
11. CE1
10. CLK
2.4
9. DATA
8. CE0
2.8
7. GND
VSOJ12pin
*Stop using the glue
Any glue must never use it after soldering LC-package to a circuit board.This product
has glass on the back side of a package.When glue invasions between circuit 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
Specifications (characteristics)
 Recommended Operating Conditions
Item
Symbol Conditions
Min.
Power voltage
VDD
-
1.6
Clock voltage
VCLK
-
1.3
Operating
temperature
TOPR
-
-40
 Frequency characteristics
Item
Symbol
Conditions
Frequency
tolerance
f/f
Ta=+25C
VDD=3.0V
Ta=+25C
Oscillation
Start-up time
tSTA
VDD=1.6V
Ta=-40Cto+85C
VDD=1.6V
*Equivalent to 1 minute of monthly deviation
Typ. Max.
3.0 5.5
3.0 5.5
+25 +85
Rating
B: 523*
1Max.
3Max.
Unit
V
V
C
Unit
10^6
s
s
 Refer to application manual for details.
 Current consumption characteristics
Item Symbol
Conditions
Min.
VDD
CE0,CE1=GND
IBK _{FOUT;output OFFï€} 
(Hi-z)
=5V -

VDD
=3V -
Current

Consumption
CE0=GND
VDD
CE1=VDD
=5V -

I32k _FOUT;
VDD
32.768kHz output ON _{=3V -}
CL=30pF

Ta=-40Cto+85C
Typ. Max. Unit
0.45 0.9
µA
0.35 0.7
8.0 20.0
µA
5.0 12.0