IL9151-3

TECHNICAL DATA IL9151-3 PULSE DIALER The IL9151-3 pulse dialer is a monolithic CMOS integrated circuit which converts pushbutton inputs to a series of pulses suitable for telephone dialing. It is intended to replace mechanical telephone dialers and can operate directly from telephone lines. CMOS technology is used to produced this device, resulting in very low power requirements and high noise immunity. The IL9151-3 can be easily interfaced with a variety of telephones, requiring only a minimal number of external components. Direct telephone line operation 4 x 3 matrix keyboard interface Supply voltage range of 2.0 to 5.5 volts Inexpensive RC oscillator Low power standby mode for redialing 22-digit redial memory Redial with either * or # key Dialer reset for line power breaks > 200 ms Selectable make/break ratio High speed test capacity ORDERING INFORMATION IL9151-3N Plastic TA = -20° to 70° C for package PIN ASSIGNMENT www.DataSheet4U.com LOGIC DIAGRAM KEYBOARD ASSIGNMENT R1 R2 R3 R4 1 2 3 4 5 6 7 8 9 * 0 # C1 C2 C3 (*,# : Redial) PIN 5 = VCC PIN 12 = GND ww.DataSheet4U.com IL9151-3 PIN DESCRIPTION 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 at C1, C2, and C3 inputs; the dialer identifies the key by examining the R1~R4 inputs. Debouncing is pr...