L7583A datasheet(2/20 Pages) AGERE

2 / 20 page

Lucent Technologies Inc.

Data Sheet

February 2001

L7583A/B/C/D Line Card Access Switch

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

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)

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

VBAT

RBAT

RLINE

FGND

TLINE

VDD

SW1

LATCH

RRINGING

TTESTout

SW2

SW3

SW4

SW5

SW7

SW9

SW8

SW10

SW6

TTESTin

TBAT

TRINGING

INTESTin

RTESTout

RTESTin

INRING

DGND

TSD

INTESTout

CONTROL

LOGIC

SCR

AND

TRIP

CKT