Data Sheet
October 1997
L7591 Subscriber Line Interface Circuit Protector
Applications
PROTECTED
1
2
3
4
TIP
8
TIP
R
PT
TRIP
CIRCUIT
7
–V
S
6
TRIP
CIRCUIT
R
PR
PROTECTED
RING
RING
5
12-1632 (C)
RPT and RPR must be properly selected for proper operation and/or response.
Figure 4. Standard Configuration
IP
1
8
7
6
5
TRIP
VMEAS
CIRCUIT
2
–48 V
3
4
TRIP
CIRCUIT
VMEAS
I
P
12-1596 (C)
Figure 5.Test Circuit
8
1
TIP
PTC
CARBON
BLOCK
L7591AB
SLIC
PROTECTOR
6
7
2
5
BATTERY
FEED*
RELAYS
CARBON
BLOCK
PTC
4
RING
VS
(–20 V TO –80 V)
12-1598 (C)
*An example device is Lucent Technologies Microelectronics Group’s LB1276 High Balance SLIC.
Figure 6. Fully Protected Electronic TIP-RING Interface (Not all devices needed in all applications)
Lucent Technologies Inc.
5
AGERE [ AGERE SYSTEMS ]
