Document
Real time clock module
SERIAL-INTERFACE REAL TIME CLOCK MODULE
www.DataSheet4U.com
RTC - 4574 SA / JE / NB
• Built in frequency adjusted 32.768 kHz crystal unit. • Interface Type : Serial interface in 3 lines form. • Operating voltage range : 1.6 V to 5.5 V • Wide Timekeeper voltage range : 1.6 V to 5.5 V • Low backup current : 0.5 µA / 3 V ( Typ. ) • 32.768 kHz frequency output function : C-MOS output With Control Pin • The various functions include full calendar, alarm, timer. • Lead(Pb)-free : Contains high melting temperature type solder (Pb85 %) exempted by RoHS directive.
Actual size RTC-4574SA RTC-4574JE RTC-4574NB
Block diagram
32.768 kHz CONTROL LINE CLOCK and CALENDAR
Overview
• 32.768 kHz frequency output function
• FOUT pin output (C-MOS output ), CL=30 pF • Output frequency selectable from1/30 Hz to 32.768 kHz (32 Values)
OSC
DIVIDER
FOUT FCON / TIRQ / AIRQ DATA CLK CE 1 CE 0
• Timer function
OUTPUT CONTROLLER INTERRUPTS CONTROLLER BUS INTERFACE CIRCUIT SHIFT REGISTER ALARM REGISTER CONTROL REGISTER TIMER REGISTER
• Timer function can be set upbetween 1/4096 second and 255 minutes. • It is recorded automatic to TF-bit at the time of event occurrence,and 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 automatic to AF-bit at the time of event occurrence,and possible to output with /AIRQ pin output (open-drain output). ∗ Functions are compatible with RX - 4574 LC.
Terminal connection / External dimensions
RTC − 4574 SA
1.27
(Unit:mm)
RTC − 4574 JE
0.65
RTC − 4574 NB
20. 19.
7.0 ± 0.3
10.1 ± 0.2
3. 4. 5. 6. 7. 8. 9. 10.
CE0 / AIRQ / TIRQ CLK DATA CE1 FCON GND
6.0 ± 0.2 5.4
18. 17. 16. 15. 14.
N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C.
3. 4. 5. 6. 7.
N.C. N.C.
5.0
12. 11. 10.
DATA CLK / TIRQ / AIRQ CE0
4. 5. 6. 7. 8. 9. 10. 11.
CE1 DATA CLK / TIRQ / AIRQ CE0 FOUT VDD
5.0 ± 0.2 4.8
6.3 Max.
2.
FOUT
13.
CE1
2.
FOUT
N.C.
2. 3.
FCON N.C.
0.5
1.
GND
14.
FCON
1.
VDD
N.C.
1.
GND
22. 21. 20. 19. 18. 17. 16.
1.3 ± 0.1
N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. N.C. − −
N.C.
3.2 ± 0.1
N.C. VDD
7.4 ± 0.2
9. 8.
1.5 Max.
13. 12. 11.
15. 14. 13. 12.
SOP − 14 pin
VSOJ − 20 pin
Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
SON − 22 pin
Specifications (characteristics)
Recommended Operating Conditions
Item Power voltage Clock voltage Operating temperature Symbol VDD VCLK TOPR Condition Min. 1.6 1.6 −40 Typ. 3.0 3.0 +25 Max. 5.5 5.5 +85 Unit V V °C
IBK
Current Consumption
∗ Refer to application manual for details.
DC characteristics
Item Symbol Condition CE0, CE1 = GND FOUT ;output OFF ( Hi - z ) VDD =5V VDD =3V VDD =5V VDD =3V Min.
Ta = -40 °C to +85 °C
Typ. 1.0
Max. 2.0
Unit
µA 0.5 1.0
Frequency characteristics
Item Frequency tolerance Oscillation start-up time Symbol ∆f/f Condition Ta = +25 °C VDD = 3.0 V Ta = +25 °C VDD = 1.6 V Rating 5 ± 23 ∗ 3 Max. Unit × 10−6 s
CE0 = GND CE1 = VDD I32k FOUT ; 32.768 kHzoutput ON CL = 30 pF
8.0
20.0 µA
tSTA
5.0
12.0
∗ Please ask for tighter tolerance.(Equivalent to 1 minute of monthly deviation)
112
http://www.epsontoyocom.co.jp
.