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L7583B View Datasheet(PDF) - Agere -> LSI Corporation

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Description
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L7583B
Agere
Agere -> LSI Corporation Agere
L7583B Datasheet PDF : 20 Pages
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L7583A/B/C/D Line Card Access Switch
Data Sheet
February 2001
Description (continued)
The L7583Bxx and L7583Dxx versions provide only an
integrated diode bridge along with current limiting and
thermal shutdown (see Figure 2 for version B). This will
cause positive faults to be directed to ground and neg-
ative faults to battery. In either polarity, faults are
reduced by the current-limit and/or thermal shutdown
mechanisms.
To protect the L7583 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
L7583 will meet all relevant ITU-T, LSSGR, FCC, or
UL* protection requirements.
The L7583 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 L7583 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 L7583, only as a
reference for the integrated protection circuit. The
L7583 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 and ring test switch will
draw a nominal 2 mA or 4 mA from the ring generator.
The L7583A/B/C/D device is packaged in a 24-pin,
plastic DIP (L7583AF/BF/CF/DF) and in a 28-pin,
plastic SOG (L7583AAJ/BAJ/CAJ/DAJ).
* UL is a registered trademark of Underwriters Laboratories, Inc.
Pin Information
FGND 1
NC 2
NC 3
TTESTin 4
SW1
SCR
AND
TRIP
CKT
SW2
24 VBAT
23 NC
22 NC
21 RTESTin
TBAT 5
TLINE 6
TRINGING 7
TTESTout 8
NC 9
SW3
SW5
SW7
SW9
20 RBAT
SW4
SW6
SW8
SW10
19 RLINE
18 RRINGING
17 RTESTout
16 LATCH
VDD 10
TSD 11
CONTROL
LOGIC
15 INTESTin
14 INRING
DGND 12
13 INTESTout
12-2364.a (F)
Note: Shown with A/C version protection. The 24-pin DIP is avail-
able with either A/C or B/D version protection.
Figure 1. 24-Pin, Plastic DIP (600 mil)
FGND 1
28 VBAT
NC 2
NC 3
NC 4
TTESTin 5
SW1
TBAT 6
TLINE 7
TRINGING 8
NC 9
SW3
SW5
SW7
TTESTout 10
NC 11
SW9
27 NC
26 NC
SW2
SW4
25 NC
24 RTESTin
23 RBAT
22 RLINE
SW6 21 NC
SW8
SW10
20 RRINGING
19 RTESTout
18 LATCH
VDD 12
TSD 13
CONTROL
LOGIC
17 INTESTin
16 INRING
DGND 14
15 INTESTout
12-2365.d (F)
Note: Shown with B/D version protection. The 28-pin SOG is avail-
able with either A/C or B/D version protection.
Figure 2. 28-Pin, Plastic SOG
2
Lucent Technologies Inc.
 

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