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RTC - 4543 SA/SB
3. Pin Connections
RTC - 4543SA
1
GND
2
1
N.C
3
CE
4
FSEL
5
WR
6
FOE
7
7
N.C
SOP - 14pin
4. Pin Functions
Pin No.
Signal
SOP-14pin
(SOP-18pin)
1
GND
( 9 )
3
CE
( 8 )
4
FSEL
( 7 )
5
WR
( 6 )
6
FOE
( 5 )
9
V
DD
( 14 )
10
CLK
( 12 )
11
DATA
( 11 )
14
FOUT
( 10 )
2,7,8,12,13
N.C.
( 1,2,3,4,13,
15,16,17,18 )
* Always connect a passthrough capacitor of at least 0.1 F as close as possible between V
14
FOUT
13
14
N.C
N.C
12
11
DATA
10
CLK
9
V
8
DD
8
N.C
I/O
Connects to negative (-) side (ground) of the power supply.
Chip enable input pin.
When high,the chip is enabled. When low,the DATA pin goes to
Input
high impedance and the CLK,DATA,and WR pins are not able to
accept input.In addition, when low,the TM bit is cleared.
Serect the frequency that is output from the FOUT pin.
Input
High : 1 Hz
Low : 32.768 kHz
DATA pin input/output switching pin.
Input
High : DATA input (when writing the RTC)
Low : DATA output (when reading the RTC)
When high, the frequency selected by the FSEL pin is output from
Input
the FOUT pin.
When low, the FOUT pin goes to high impedance.
Connects to positive (+) side of the power supply.
Serial clock input pin.
Input
Data is gotten at the rising edge during a write, and data is output
at the rising edge during a read.
Bi-directional Input/outout pin that is used for writing and reading data.
Outputs the frequency selected by the FSEL pin. 1 Hz output is
Output
synchronized with the internal one-second signal.
This output is not affected by the CE pin.
Although these pins are not connected internally,they should
always be left open in order to obtain the most stable oscillation
possible.
Page - 2
RTC - 4543SB
1
N.C
1
2
N.C
3
N.C
N.C
4
5
FOE
6
WR
7
FSEL
8
CE
9
9
GND
SOP - 18pin
Function
18
N.C
18
17
N.C
N.C
16
15
N.C
14
V
DD
13
N.C
12
CLK
10
11
DATA
10
FOUT
and GND.
DD
MQ - 252 - 03
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