CPC7581
1.8 Protection Circuitry Electrical Specifications
Parameter
Conditions
Symbol
Minimum
Typical
Maximum
Unit
Parameters Related to the Diodes in the Diode Bridge
Voltage drop at
Apply dc current limit of break
continuous current (50/
switches
Forward
Voltage
-
-
2.1
5
3
-
60 Hz)
V
A
Voltage drop at surge Apply dynamic current limit of break
switches
Forward
Voltage
current
Parameters Related to the Protection SCR
Surge current
Trigger current
-
-
-
-
*
60
(CPC7581xA)
70
(CPC7581xC)
T=+25°C
T=+85°C
T=+25°C
I
TRIG
35
(CPC7581xA)
40
(CPC7581xC)
-
-
mA
110
(CPC7581xA)
135
(CPC7581xC)
I
Hold current
HOLD
60
70
(CPC7581xA) (CPC7581xA)
110 115
(CPC7581xC) (CPC7581xC)
T=+85°C
**
V
or
TBAT
I
= I
V
-4
V
-2
Gate trigger voltage
Reverse leakage current
On-state voltage
-
V
GATE TRIGGER
BAT
BAT
V
RBAT
V
= -48 V
I
-
-
-
-
1.0
μA
V
BAT
VBAT
0.5 A, t = 0.5 μs
2.0 A, t = 0.5 μs
V
or
-3
-5
-
-
TBAT
V
-
V
RBAT
*Passes GR1089 and ITU-T K.20 with appropriate secondary protection in place.
**V must be capable of sourcing I for the internal SCR to activate.
BAT
TRIGGER
1.9 Truth Table
Break
Switches
IN
T
State
Latch
Ringing Switches
RINGING
SD
Talk
0
1
On
Off
Off
On
0
1
Ringing
Latched
All-Off
Z
X
X
1
Unchanged
X
0
Off
Off
1
Z = High Impedance. Because T has an internal pull up at this pin, it should be controlled with an open-collector or open-drain type device.
SD
R05
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