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RX-4571LC (Low Backup Voltage Serial-Interface Real Time Clock Module)
- Built in frequency adjusted 32.768kHz crystal unit.
- Interface Type
3-wire serial interface
- Operating voltage range
1.6V to 5.5V
- The wide voltage for time keeping
1.0V to 5.5V / Ta=+25°C
- Low backup current
0.32µA(Typ.) / 3V
- 32.768kHz frequency output function
C-MOS output With OE pin
- Real-time clock function Clock/calendar function, auto leap year correction function,
Alarm and Timer interrupt function, etc.
Block diagram
Overview
- 32.768kHz frequency output function
- FOUT pin output(C-MOS output), CL=30pF
- Timer function
- Timer function which can be set up between 1/4096second and 4095minutes.
- Alarm function
- Alarm function can be set to any combination of day, day of week, hour, or minute.
Specifications *Refer to application manual for details.
Recommend Operating Conditions
Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
---|---|---|---|---|---|---|
Power voltage | VDD | - | 1.6 | 3.0 | 5.5 | V |
Clock voltage | VCLK | Ta=+25°C | 1.0 | 3.0 | 5.5 | V |
Ta=-40 to +85°C | 1.1 | 3.0 | 5.5 | V | ||
Operating temperature | TOPR | - | -40 | +25 | +85 | °C |
Frequency characteristics
Item | Symbol | Condition | Rating | Unit |
---|---|---|---|---|
Frequency tolerance | Δ f/f | Ta=+25°C VDD=3.0V |
5±23 * | ×10-6 |
Oscillation start-up time | tSTA | Ta=+25°C VDD=1.6V |
1Max. | s |
* Please ask for tighter tolerance. (Equivalent to ±1 minute of monthly deviation)
Current consumption characteristics
*Ta=-40°C to +85°C
Item | Symbol | Conditions | Min. | Typ. | Max. | Unit | |
---|---|---|---|---|---|---|---|
Current consumption | lBK | CE=GND /IRQ=OFF FOUT;output OFF(Hi-z) | VDD=5V | - | 0.40 | 1.00 | µA |
VDD=3V | - | 0.32 | 0.95 | ||||
l32k | CE=GND /IRQ=OFF FOUT; 32.768kHz output ON CL=30pF |
VDD=5V | - | 8.0 | 14.0 | µA | |
VDD=3V | - | 5.0 | 8.5 |
Pin function
Signal Name | Input/Output | Function |
---|---|---|
CE | Input | The chip enabled input pin 0. ( It has a built -in pull-down resistance ) |
CLK | Input | The shift clock input pin for serial data transfer. |
DIO | Bi-directional | The data input / output pin for serial data transfer. |
FOUT | Output | 32.768kHz clock output pin with the output control function. (C-MOS) FOE pin control the condition of FOUT with FSEL1-bit, FSEL0-bit, etc. |
FOE | Input | |
/ IRQ | Output | Interrupt output (N-ch open drain) |
VDD | - | Connected to a positive power supply. |
GND | - | Connected to a ground. |
Terminal connection / External dimensions
(Unit: mm)
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
Footprint (Recommended)
(Unit: mm)
To maintain stable operation, provide a 0.1uF by-pass capacitor
at a location as near as possible to the power source terminal of the crystal product (between Vcc - GND).