IL5851

pin is connected to the common part in general applications.

RC1-RC3

7,8,9

Oscillator

The IL5851N contains on-chip inverters to provide oscillator which will operate

with a minimum external components.

Following figure shows the on-chip configuration with the necessary external

The oscillator period is given by:

Accuracy and stability will be enhanced with this capacitance minimized.

PPS

10

10/20pps Select

Connecting this pin to GND (pin 6) will select an output pulse rate of 10pps.

M/B

11

Make/break Select

The Make/Break pin controls the Make/Break ratio of the pulse output. The

the following table.

Input

Make

Break

33.4%

66.6%

GND(PIn 6)

40%

60%

____

Mute

12

Mute Output

The mute output is an open-drain N-Channel transistor designed to drive external

bipolar transistor.

This circuitry is usually used to mute the receiver during outpulsing. As shown in

beginning of the predigital pause and turns off (goes to an open circuit) following

the last break.

The delay from the end of the last break until the mute output turns off is mute

OH

17

ON-HOOK/TEST

This pin detects the state of the hook switch contact “OFF HOOK” corresponds

this mode, which can be up to 300msec, is completed, the circuit is deactivated

and will require current only necessary to sustain the memory and power-up-clear

detect circuitry (refer to the electrical specifications).

Upon retuning off-hook, a negative transistion on the mute output will insure the

speech network is connected to the line. If the first key entry is either a * or #, the

3