Table 6. Make-Before-Break Operation (Ringing to Idle/Talk Transition)

Ring

Ring

Break

Return

Access

Line Access

Switches

Switch

Switch

Switches

Access

Input

TSD

State

Timing

1 & 2

3

4

5 & 6

0V

5V

Float

Ringing

-

Open

Closed

Closed

Open

0V

0V

Float

Make-before-break

SW4 waiting for next zero current

Closed

Open

Closed

Open

crossing to turn off. Maximum

time is one half of ringing. In this

transition state, current that is

limited to the dc break switch

current limit value will be sourced

from the ring node of the SLIC

0V

0V

Float

Idle / Talk

Zero cross current has occurred

Closed

Open

Open

Open

Table 5. Additional Electrical Characteristics

Parameters

Conditions

Symbol

Min

Typ

Max

Units

Digital Input Characteristics

Input Low Voltage

-

-

-

-

1.5

V

Input High Voltage

-

-

3.5

-

-

V

Input Leakage Current (High)

V

I

log

-

0.1

1

µA

V

Input Leakage Current (Low)

V

I

log

-

0.1

1

µA

V

Power Requirements

Power Dissipation

V

Idle/Talk State or All Off State

I

-

5.5

7.5

mW

Ringing State or Access State

I

DD

-

6.5

10

mW

V

V

Idle/Talk State or All Off State

I

DD

-

1.1

1.5

mA

Ringing State or Access State

I

DD

-

1.3

1.9

mA

V

V

Idle/Talk State or All Off State

I

BAT

-

0.1

10

µA

Ringing State or Access State

I

BAT

-

0.1

10

µA

Shutdown Activation Temperature

-

-

110

125

150

˚C

Shutdown Circuit Hysteresis

-

-

10

-

25

˚C

CPC7582

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Rev. 1.0