CPC7583

www.clare.com

7

Rev. E

Table 10. Break-Before-Make Operation (Ringing to Idle/Talk Transition)

Ring

Ring

Break

Return

Access

All Other

Switches

Switch

Switch

Access

Ring

Testin

Testout TSD

State

Timing

1 & 2

3

4

Switches

5V

0V

0V

Float

Ringing

-

Open

Closed

Closed

Open

5V

0V

5V

Float

All Off

Hold this state for </= 25ms.

Open

Open

Closed

Open

SW4 waiting for zero current to

turn off.

5V

0V

5V

Float

All Off

Zero current has occurred.

Open

Open

Open

Open

SW4 has opened.

0V

0V

0V

Float

Idle/Talk

Release Break Switches

Closed

Open

Open

Open

Alternate “Break-Before-Make” Operation

Note that the break-before-make operation can also be achieved using TSD as an input. In lines 2 & 3 of Table 10, instead of using the

logic input pins to force the “all off” state, force TSD to ground. This will override the logic inputs and also force the all off state. Hold

this state for 25 ms. During this 25 ms all off state, toggle the inputs from the 10 (ringing state) to 00 (idle/talk state). After 25 ms,

release TSD to return switch control to the input pins which will set the idle talk state.

When using the CPC7583 in this mode, forcing TSD to ground will override the INPUT pins and force an all off state. Setting TSD to

+5V will allow switch control via the logic INPUT pins. However, setting TSD to +5V will also disable the thermal shutdown mecha-

nism. This is not recommended. Therefore, to allow switch control via the logic INPUT pins, allow TSD to float.

Thus when using TSD as an input, the two recommended states are 0 (overrides logic input pins and forces all off state) and float

(allows switch control via logic input pins and thermal shutdown mechanism is active). This may require use of an open collector

buffer.

Table 11. Electrical Specifications, Protection Circuitry

PARAMETER

CONDITIONS

SYMBOL

MIN

TYP

MAX

UNITS

Parameters Related to Diodes

(in Diode Bridge)

Voltage Drop @ Continuous

Apply +/-dc current limit of break

Forward

-

2.8

3.5

V

Current (50/60 Hz)

switches

Voltage

Voltage Drop @ Surge

Apply +/-dynamic current limit of

Forward

-

5

-

V

Current

break swithces

Voltage

Parameters Related to

Surge Current

-

-

-

-

*

A

Trigger Current (25˚C)

-

I

TRIG

-60

-

mA

Hold Current (25˚C)

-

I

HOLD

-

110

-

mA

Trigger Current (85˚C)

-

I

TRIG

-35

-

mA

Hold Current (85˚C)

-

I

HOLD

60

70

-

mA

Gate Trigger Voltage

Trigger Current

-

-

V

Reverse Leakage Current

VBAT

-

-

-

1.0

µA

0.5A t = 0.5 ms

--3

-

V

2.0A t = 0.5 ms

-

-

-5

-

V

* Passes GR1089 and ITU-T K.20 with appropriate secondary protection in place.