ra-4574sa Epson Electronics America, Inc., ra-4574sa Datasheet
![no-image](/images/no-image-200.jpg)
ra-4574sa
Manufacturer Part Number
ra-4574sa
Description
Serial-interface Real Time Clock Module
Manufacturer
Epson Electronics America, Inc.
Datasheet
1.RA-4574SA.pdf
(1 pages)
Signal Name Input / Output
! ! ! !
Power voltage
Clock voltage
Operating
! ! ! !
Frequency
Oscillation
For Automotive
SERIAL-INTERFACE REAL TIME CLOCK MODULE
RA - 4574 SA
Equivalent to 1 minute of monthly deviation
temperature
tolerance
start-up time
FCON
/ AIRQ
/ TIRQ
FOUT
Block diagram
DATA
Pin Function
Specifications (characteristics)
GND
CE0
CE1
CLK
Built in frequency adjusted 32.768 kHz crystal unit.
Interface Type
Operating voltage range
Wide Timekeeper voltage range : 1.6 V to 5.5 V
Low backup current
32.768 kHz frequency output function : C-MOS output With Control Pin
The various functions include full calendar, alarm, timer.
V
Frequency characteristics
FOUT
FCON
/ TIRQ
/ AIRQ
DATA
CLK
CE 1
CE 0
Recommended Operating Conditions
Real time clock module
Real time clock module
Real time clock module
Real time clock module
DD
Item
Item
Bi-directional
Output
Output
Output
Input
Input
Input
Input
-
-
Symbol
Symbol
T
V
V
t
STA
OPR
CLK
DD
f / f
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
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.
Connected to a positive power supply.
Connected to a ground.
The open drain output pin for alarm and time update interrupts.
The open drain output pin for timer interrupt.
Real time clock module becomes possible.
32.768 kHz
T
V
T
V
a
a
DD
DD
OUTPUT
INTERRUPTS
OSC
= +25 °C
= +25 °C
Condition
BUS
= 3.0 V
= 1.6 V
CONTROLLER
CONTROLLER
INTERFACE
-
-
-
Condition
CIRCUIT
DIVIDER
: 3-wire serial interface
: 1.6 V to 5.5 V
: 0.5 A / 3 V (Typ.)
Min.
1.6
1.6
40
Typ.
+25
Function
3.0
3.0
3 Max.
5
Rating
http://www.epsontoyocom.co.jp
CLOCK and
TIMER
ALARM
CONTROL
SHIFT REGISTER
23
Max.
+85
5.5
5.5
CALENDAR
REGISTER
REGISTER
REGISTER
Unit
Unit
°C
10
V
V
s
6
CONTROL LINE
Actual size
! ! ! !
Current
Consumption
Current consumption characteristics
Item
Symbol
32.768 kHz frequency output function
Timer function
Alarm function
I
Overview
I
32k
BK
Terminal connection / External dimensions
• FOUT pin output (C-MOS output ), CL=30 pF
• Output frequency selectable from 1/30 Hz to 32.768 kHz(32 Values)
• Timer function can be set between 1/4096 second and 255 minutes.
• It is recorded automatically to TF-bit at the time of event
• Selectable one time mode or repeat mode.
• Alarm function can be set to any combination of day of
• It is recorded automatically to AF-bit at the time of event
occurrence, and it’s possible to output with /TIRQ pin output
(open-drain output).
week, hour, or minute.
occurrence, and it’s possible to output with /AIRQ pin output
(open-drain output).
CE0, CE1 = GND
FOUT ;Output OFF
CE0 = GND
CE1 = V
FOUT ;
32.768 kHz output ON
CL = 30 pF
Metal may be exposed on the top or bottom of this product.
This will not affect any quality, reliability or electrical spec.
1.
2.
3.
4.
5.
6.
7.
GND
FOUT
N.C.
N.C.
N.C.
N.C.
V
( Hi - z )
DD
DD
Condition
Refer to application manual for details.
RA
SOP
4574 SA
7.4
Epson Toyocom
Epson Toyocom
Epson Toyocom
Epson Toyocom
V
V
V
V
= 5 V
= 3 V
= 5 V
= 3 V
5.0
DD
DD
DD
DD
14 pin
0.2
Min.
Typ.
T
14.
13.
12.
11.
10.
1.0
0.5
8.0
5.0
a
9.
8.
= 40 C to +85 C
FCON
CE1
DATA
CLK
/ TIRQ
/ AIRQ
CE0
Max.
20.0
12.0
2.0
1.0
(Unit:mm)
Unit
µA
µA