The AX 31002 is a bipolar integrated circuit. It is designed for telephone bell replacement. It can also be used as alarms or other alerting devices.

Features:
· Current consumption is small
· Oscillation frequency is variable
· Adjustable start-up current
· Higher driving capability
· Built-in threshold circuits prevent false triggering due to power noise as well as 'chirps' due to rotary dial
· Few external components
· Easy connection to telephone system

Package: DIP - 8

Characteristics

Symbol

Test Condition

Min.

Typ.

Max.

Unit

Operating Voltage

V_opr

-

-

29

V

Initiation Supply Voltage

V_si

^{(Note 1)}

17

19

21

V

Sustaining Supply Voltage

V_sus

^{(Note 2)}

10.5

12

13.5

V

Initiation Current Consumption

I_si

No Load

1.4

3.3

4.2

mA

Sustaining Current Consumption

I_sus

No Load

0.34

1.4

2.5

mA

Oscillator Frequency

f_L

C₁=0.47uF, R₁=165kW

9

10

11

Hz

f_H1

C₂=6800pF, R₂=191kW

461

512

563

f_H2

576

640

703

Output Voltage

"H" Level

V_OH

V_CC=24V, I_OH =-10mA, Pin 7=GND

20

21.5

22.5

V

"L" Level

V_OL

V_CC=24V, I_OH=10mA, Pin 7=7V

0.7

1

2

V