CPC7582 Datasheet, PDF (6/12 Pages) Clare, Inc. – Line Card Access Switch

CPC7582
Table 7. Break-Before-Make Operation (Ringing to Idle/Talk Transition)
Access Input
0V 5V
5V 5V
TSD
Float
Float
5V 5V Float
0V 0V Float
State
Ringing
All Off
All Off
SW4 has opened.
Idle/Talk
Timing
-
Hold this state for <= 25ms.
SW4 waiting for zero current to
turn off.
Zero current has occurred.
Break
Switches
1&2
Open
Open
Open
Release Break Switches
Closed
Return
Switch
3
Closed
Open
Open
Open
Ring
Ring
Access Line Access
Switch Switches
4
5&6
Closed
Open
Closed
Open
Open
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 7,
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
ringing state (Input=5V, Access=0V) to the idle/talk state (Input=0V, Access=0V). After 25 ms, release TSD to return
switch control to the input pins which will set the idle talk state.
When using the CPC7582 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 mechanism. 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 8. Electrical Specifications, Protection Circuitry
Parameters
Conditions
Parameters Related to Diodes
(in Diode Bridge)
Voltage Drop @ Continuous
Current (50/60 Hz)
Apply +/-dc current limit of break
switches
Voltage Drop @ Surge
Current
Apply +/-dynamic current limit of
break switches
Parameters Related to
Protection SCR¹
Surge Current
-
Trigger Current (+25˚C)
-
Hold Current (+25˚C)
-
Trigger Current (+85˚C)
-
Hold Current (+85˚C)
Gate Trigger Voltage
Trigger Current
Reverse Leakage Current
ON State Voltage¹
V_BAT
0.5A t = 0.5 ms
2.0A t = 0.5 ms
1 _{Only for the CPC7581BA.}
* Passes GR1089 & ITU-T K.20 with appropriate secondary protection in place.
Symbol
Forward
Voltage
Forward
Voltage
-
I_TRIG
I_HOLD
I_TRIG
I_HOLD
-
-
V_on
-
Min
Typ
-
2.1
-
5
-
-
-
60
-
100
-
35
60
70
V_BAT - 4
-
-
-
-
-3
-
-5
Max
3
-
*
-
-
-
-
V_BAT - 2
1.0
-
-
Units
V
V
A
mA
mA
mA
mA
V
µA
V
V
6
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Rev. 1.0