LUCL8574DP-D AGERE [Agere Systems], LUCL8574DP-D Datasheet - Page 10

• Manufacturer Part Number: LUCL8574DP-D
• Description: L8574D Resistive Subscriber Line Interface Circuit(SLIC), Ring Relay,and Protector(SRP)for Long Loop and TR-57 Applications
• Manufacturer: AGERE [Agere Systems]

L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring
Relay, and Protector (SRP) for Long Loop and TR-57 Applications
Electrical Characteristics
Fault Protection
Loss of Power Supplies
The L8574 must protect itself from lightning and power cross voltages on Tip and Ring if any (or any combination)
of the power supplies (V
ally, if any power supply is disconnected, no overvoltage on Tip or Ring can cause a supply voltage to exceed its
maximum rating. Under these conditions, V
pins of supplies which have more than one pin are shorted together, and bypass capacitors are connected. To sat-
isfy these requirements (and also to disconnect ringing from the loop when ring trip cannot be detected), the L8574
is placed into the disconnect state depending on the voltage at the power supply pins as shown in Table 6.
Table 6. Loss of Power Supplies
10
V
V
Normal Operating State (as defined by control logic)
Disconnect State
Normal Operating State (as defined by control logic)
Disconnect State
Disconnect State
CCA
BAT1
:
and V
DD
:
(continued)
CCA
Parameter
, V
DD
, V
BAT1
(continued)
, and V
CCA
BAT2
and V
) are disconnected (open circuit) from their dc source. Addition-
DD
are considered as one supply (V
Min
–10
–65
—
—
1
Typ
—
—
—
—
—
CCA
Lucent Technologies Inc.
Max
–75
–20
4.5
shorted to V
—
—
October 1998
Data Sheet
Unit
V
V
V
V
V
DD
), the