Data Sheet
November 1999
L7582 Tip Ring Access Switch
Description (continued)
Pin Information
The L7582Bxx version provides only an integrated
diode bridge along with current limiting and thermal
shutdown as shown in Figure 2. This will cause positive
faults to be directed to ground and negative faults to
battery. In either polarity, faults are reduced by the cur-
rent-limit and/or thermal shutdown mechanisms.
SCR
AND
TRIP
CKT
FGND
TBAT
1
2
3
4
5
6
7
8
16 VBAT
15 RBAT
SW2
SW1
SW3
SW5
To protect the L7582 from an overvoltage fault condi-
tion, use of a secondary protector is required. The sec-
ondary protector must limit the voltage seen at the tip/
ring terminals to prevent the breakdown voltage of the
switches from being exceeded. To minimize stress on
the solid-state contacts, use of a foldback- or crowbar-
type secondary protector is recommended. With proper
choice of secondary protection, a line card using the
L7582 will meet all relevant ITU-T, LSSGR, FCC, or
UL* protection requirements.
TLINE
14 RLINE
SW4
TRINGING
TACCESS
VDD
13 RRINGING
SW6
12 RACCESS
11 LATCH
10 INRING
TSD
DGND
9
INACCESS
The L7582 operates from a 5 V supply only. This
gives the device extremely low idle and active power
dissipation and allows use with virtually any range of
battery voltage. This makes the L7582 especially
appropriate for remote power applications such as
DAML or FOC/FITL or other Bellcore TA 909 applica-
tions where power dissipation is particularly critical.
12-2306.i (F)
Note: Shown with A version protection. The 16-pin SOG is available
with either A or B version protection.
Figure 1. 16-Pin, Plastic SOG
A battery voltage is also used by the L7582, only as a
reference for the integrated protection circuit. The
L7582 will enter an all OFF state upon loss of battery.
During power ringing, to turn on and maintain the ON
state, the ring access switch will draw a nominal 2 mA
or 4 mA from the ring generator.
FGND
TBAT
1
2
3
4
5
6
7
8
16 VBAT
15 RBAT
The L7582 device is packaged in a 16-pin, plastic DIP
package (L7582AC/BC) and a 16-pin, plastic SOG
package (L7582AAE/BAE). The L7582AAE/BAE are
pin compatible with the L7542AAE/BAE.
SW2
SW4
SW6
SW1
SW3
SW5
TLINE
14 RLINE
TRINGING
TACCESS
VDD
13 RRINGING
12 RACCESS
11 LATCH
10 INRING
*UL is a registered trademark of Underwriters Laboratories, Inc.
TSD
DGND
9
INACCESS
12-2306.c (F)
Note: Shown with B version protection. The 16-pin DIP is available
with either A or B version protection.
Figure 2. 16-Pin, Plastic DIP
2
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
