pulse dialer.
of any voltage higher than maximum rated voltages to this high-impedance circuit. For proper operation, VIN and VOUT sho.
PIN No. 1 2 3 4 14 15 16 5 12 6 7 8 NAME R1~R4 Key inputs. These inputs can be interfaced to either an XY matrix keyboard or a 2 of 7 type keyboard. The keypad inputs are normally held at high. When a key is depressed, scanning signals are presented .
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