CPC7691

R00E

PRELIMINARY

9

1.9 Protection Circuitry Electrical Specifications

1.10 Truth Table

Parameter

Conditions

Symbol

Minimum

Typical

Maximum

Unit

Protection Diode Bridge

Forward Voltage drop,

continuous current

(50/60 Hz)

Apply ± dc current limit of break

switches

-2.1

3.0

V

Forward Voltage drop,

surge current

Apply ± dynamic current limit of break

switches

-5-

Protection SCR (CPC7691xB)

Surge current

-

-

-

-

*

A

Trigger current:

SCR activates, +25

° C

-

65

-mA

SCR activates, +85

° C45

Hold current: Current

through protection SCR

SCR remains active, +25

° C

-

195

-mA

SCR remains active, +85

° C

110

130

Gate trigger voltage

§

-

V

-0.2

1.0

μA

On-state voltage

0.5 A, t = 0.5

μsV

-

-3

-V

2.0 A, t = 0.5

μs-5

Temperature Shutdown Specifications

Shutdown activation

temperature

Not production tested - limits are

guaranteed by design and Quality

Control sampling audits.

110

125

150

°C

Shutdown circuit

hysteresis

10

-

25

°C

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

State

Latch

Break

Switches

Ringing Switches

Talk

0

0

On

Off

Ringing

1

Off

On

Latched

X

1

Unchanged

All-Off

X

X

0

Off

Off