ATTL7581AC Ver la hoja de datos (PDF) - Agere -> LSI Corporation
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ATTL7581AC Datasheet PDF : 16 Pages
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L7581 Ringing Access Switch
Data Sheet
November 1999
Description (continued)
Pin Information
To protect the L7581 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
L7581 will meet all relevant ITU-T, LSSGR, FCC, or
UL* protection requirements.
The L7581 operates off of a 5 V supply only. This gives
the device extremely low idle and active power dissipa-
tion and allows use with virtually any range of battery
voltage. This makes the L7581 especially appropriate
for remote power applications such as DAML or FOC/
FITL or other Bellcore TA 909 applications where
power dissipation is particularly critical.
A battery voltage is also used by the L7581, only as a
reference for the integrated protection circuit. The
L7581 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.
The L7581 device is packaged in a 16-pin, plastic DIP
package (L7581AC/BC) and a 16-pin, plastic SOG
package (L7581AAE/BAE). These devices are pin
compatible with the L7541 device.
* UL is a registered trademark of Underwriters Laboratories, Inc.
FGND 1
NC 2
TBAT 3
TLINE 4
SW1
TRINGING 5
SW3
VDD 6
NC 7
TSD 8
SCR
AND
TRIP
CKT
16 VBAT
15 NC
SW2
14 RBAT
13 RLINE
12 RRINGING
SW4
11 LATCH
TEMPERATURE
SHUTDOWN
10 INPUT
9 DGND
12-2306.a (C)
Note: Shown with A version protection. The 16-pin DIP is available
with either A or B version protection.
Figure 1. 16-Pin, Plastic DIP
FGND 1
TBAT 2
TLINE 3
NC 4
SW1
SW3
SW2
SW4
16 VBAT
15 RBAT
14 RLINE
13 NC
NC 5
12 RRINGING
TRINGING 6
11 LATCH
VDD 7
TSD 8
10 INPUT
TEMPERATURE
SHUTDOWN
9 DGND
12-2307.a (F)
Note: Shown with B version protection. The 16-pin SOG is available
with either A or B version protection.
Figure 2. 16-Pin, Plastic SOG
2
Lucent Technologies Inc.
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