单片机

146818
Real-time clock with 50 bytes RAM.
+-----+--+-----+
|1 +--+ 24| VCC
X1 |2 23| SQW
X2 |3 22|
AD0 |4 21| /RCLR
AD1 |5 20| VBAT
AD2 |6 146818 19| /INT
AD3 |7 18| /RST
AD4 |8 17| DS
AD5 |9 16| GND
AD6 |10 15| R//W
AD7 |11 14| AS
GND |12 13| /CE
+--------------+