CPC7591
1.9 Protection Circuitry Electrical Specifications
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
V
-
-
2.1
5
3.0
-
F
V
Forward Voltage drop, Apply dynamic current limit of break
surge current switches
V
F
Protection SCR (CPC7591xA)
Surge current
-
-
-
-
-
*
-
A
SCR activates, +25° C
65
Trigger current:
Current into V pin.
I
mA
TRIG
BAT
SCR activates, +85° C
45
SCR remains active, +25° C
SCR remains active, +85° C
-
195
130
Hold current: Current
through protection SCR
I
-
mA
HOLD
110
V
or
TBAT
§
V
-4
V
-2
Gate trigger voltage
Reverse leakage current
On-state voltage
-
V
μA
V
I
= I
GATE TRIGGER
BAT
BAT
V
RBAT
V
= -48 V
I
-
0.2
-3
1.0
BAT
VBAT
0.5 A, t = 0.5 μs
2.0 A, t = 0.5 μs
V
or
TBAT
-
-
V
-5
RBAT
Temperature Shutdown Specifications
Shutdown activation
temperature
T
T
110
10
125
-
150
25
°C
°C
Not production tested - limits are
guaranteed by design and Quality
Control sampling audits.
TSD_on
Shutdown circuit
hysteresis
TSD_off
*Passes GR1089 and ITU-T K.20 with appropriate secondary protection in place.
§
BAT
V
must be capable of sourcing I
for the internal SCR to activate.
TRIGGER
1.10 Truth Table
State
Break
Switches
IN
T
SD
Latch
Ringing Switches
RINGING
Talk
0
1
On
Off
Off
On
0
1
Ringing
Latched
All-Off
Z
X
X
1
Unchanged
X
Off
Off
0
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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