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RTC-4543SB (Simple Function Serial-Interface Real Time Clock Module)
- Built in frequency adjusted 32.768kHz crystal unit.
- Interface Type
3-wire serial interface - Operating voltage range
2.5V to 5.5V - Wide Timekeeper voltage range
1.4V to 5.5V - 32.768kHz frequency output function
C-MOS output With Control Pin - The various functions include full calendar, timer, and low voltage detection.
Block diagram
Overview
- 32.768kHz frequency output function
- FOUT pin output (C-MOS output ), CL=30pF
- FOE pin enables output on/off control.
- FSEL pin enables output selectable 32.768kHz or 1 Hz.
- Power supply voltage monitoring function
- Detection that power supply voltage descended to 1.7V or less.
- Automatic record to FDT-bit at the time of power supply decline detection.
Pin function
Signal Name | Input/Output | Function |
---|---|---|
CE | Input | The chip enabled input pin. At the HIGH level, access becomes possible. |
CLK | Input | The shift clock input pin for serial data transfer. |
WR | Input | DATA pin input / output switching pin. |
DATA | Bi-directional | The data input / output pin for serial data transfer. |
FOUT | Output | 32.768kHz or 1Hz clock output pin (C-MOS output). High impedance at output off. |
FOE | Input | The input pin for the FOUT output control. |
FSEL | Input | Select the frequency that is output from the FOUT pin. |
VDD | - | Connected to a positive power supply. |
GND | - | Connected to a ground. |
Terminal connection / External dimensions
(Unit: mm)
Metal may be exposed on the top or bottom of this product. This will not affect any quality, reliability or electrical spec.
Specifications *Refer to application manual for details.
Recommend Operating Conditions
Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
---|---|---|---|---|---|---|
Power voltage | VDD | - | 2.5 | 5.0 | 5.5 | V |
Clock voltage | VCLK | - | 1.4 | 5.0 | 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=5.0V |
5±23 * | ×10-6 |
Oscillation start-up time | tSTA | Ta=+25°C VDD=2.5V |
3Max. | s |
* Please ask for tighter tolerance.(Equivalent to ±1minute of monthly deviation )
Current consumption characteristics
*Ta=-40°C to +85°C
Item | Symbol | Conditions | Min. | Typ. | Max. | Unit | |
---|---|---|---|---|---|---|---|
Current Consumption |
lBK | CE=GND FOE=GND FOUT;output OFF(Hi-z) |
VDD=5V | 1.5 | 3.0 | µA | |
VDD=3V | 1.0 | 2.0 | |||||
VDD=2V | 0.5 | 1.0 |
Supply Voltage Detection Characteristic
Item | Symbol | Condition | Min. | Typ. | Max. | Unit |
---|---|---|---|---|---|---|
Power supply detection voltage |
VDT | VDD pin | 1.4 | 1.7 | 2.0 | V |