Epson RTC-4543SA, RTC-4543SB manual 5

RTC - 4543 SA/SB

3. Pin Connections

			RTC - 4543SA			14	FOUT				RTC - 4543SB
1	GND							1	N.C	1		18	18 N.C
2	N.C	1			14	13	N.C	2	N.C				17 N.C
3	CE					12	N.C	3	N.C				16 N.C
								4	N.C				15	N.C
4	FSEL					11	DATA
								5	FOE				14	VDD
5	WR					10	CLK	6	WR				13	N.C
6	FOE	7			8	9	VDD	7	FSEL				12	CLK
								8 CE		9		10 11 DATA
7	N.C					8	N.C
				SOP - 14pin				9	GND				10 FOUT
											SOP - 18pin

4. Pin Functions

Signal	Pin No.	I/O	Function
	SOP-14pin
	(SOP-18pin)
GND	1		Connects to negative (-) side (ground) of the power supply.
	( 9 )
	3		Chip enable input pin.
		Input	When high,the chip is enabled. When low,the DATA pin goes to
CE	( 8 )		high impedance and the CLK,DATA,and WR pins are not able to
			accept input.In addition, when low,the TM bit is cleared.
	4		Serect the frequency that is output from the FOUT pin.
FSEL		Input	High : 1 Hz
	( 7 )
			Low : 32.768 kHz
	5		DATA pin input/output switching pin.
WR		Input	High : DATA input (when writing the RTC)
	( 6 )
			Low : DATA output (when reading the RTC)
	6		When high, the frequency selected by the FSEL pin is output from
FOE		Input	the FOUT pin.
	( 5 )
			When low, the FOUT pin goes to high impedance.
VDD	9		Connects to positive (+) side of the power supply.
	( 14 )
	10		Serial clock input pin.
CLK		Input	Data is gotten at the rising edge during a write, and data is output
	( 12 )
			at the rising edge during a read.
DATA	11	Bi-directional	Input/outout pin that is used for writing and reading data.
	( 11 )
	14		Outputs the frequency selected by the FSEL pin. 1 Hz output is
FOUT		Output	synchronized with the internal one-second signal.
	( 10 )
			This output is not affected by the CE pin.
	2,7,8,12,13		Although these pins are not connected internally,they should
N.C.	( 1,2,3,4,13,		always be left open in order to obtain the most stable oscillation
	15,16,17,18 )		possible.

* Always connect a passthrough capacitor of at least 0.1 ∝ F as close as possible between VDD and GND.

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