CPC7583 Datasheet, PDF (7/16 Pages) Clare, Inc. – Line Card Access Switch

CPC7583
Table 10. Break-Before-Make Operation (Ringing to Idle/Talk Transition)
Ring Testin Testout TSD
5V
0V
0V Float
5V
0V
5V Float
State
Ringing
All Off
5V
0V
5V Float
All Off
0V
0V
0V Float
Idle/Talk
Timing
-
Hold this state for </= 25ms.
SW4 waiting for zero current to
turn off.
Zero current has occurred.
SW4 has opened.
Release Break Switches
Break
Switches
1&2
Open
Open
Open
Closed
Ring
Return
Switch
3
Closed
Open
Open
Open
Ring
Access
Switch
4
Closed
Closed
Open
Open
All Other
Access
Switches
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 10, 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 10 (ringing state) to 00 (idle/talk state). After 25 ms,
release TSD to return switch control to the input pins which will set the idle talk state.
When using the CPC7583 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 mecha-
nism. 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 11. Electrical Specifications, Protection Circuitry
PARAMETER
CONDITIONS
SYMBOL
MIN
TYP
MAX
UNITS
Parameters Related to Diodes
(in Diode Bridge)
Voltage Drop @ Continuous Apply +/-dc current limit of break
Forward
-
2.8
3.5
V
Current (50/60 Hz)
switches
Voltage
Voltage Drop @ Surge
Apply +/-dynamic current limit of
Forward
-
5
-
V
Current
break swithces
Voltage
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
Reverse Leakage Current
ON State Voltage¹
-
-
-
-
-
Trigger Current
VBAT
0.5A t = 0.5 ms
2.0A t = 0.5 ms
1 _{Only for the CPC7583BA and CPC7583BC.}
* Passes GR1089 and ITU-T K.20 with appropriate secondary protection in place.
-
-
-
*
A
I
-
60
-
mA
TRIG
I
-
110
-
mA
HOLD
I
-
35
-
mA
TRIG
I_HOLD
60
70
-
mA
-
V_BAT - 4
-
V_BAT - 2
V
-
-
-
1.0
µA
V_on
-
-3
-
V
-
-
-5
-
V
Rev. E
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