L7591 Datasheet

IC型號：
L7591
PDF描述：
Subscriber Line Interface Circuit Protector
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PDF頁數(shù)：
8頁
芯片廠家：
AGERE

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Data Sheet

October 1997

L7591 Subscriber Line Interface Circuit Protector

Features

Description

The L7591 Subscriber Line Interface Circuit (SLIC)

Protector is designed to protect line-feed circuitry

from fault-induced lightning and power-cross surge

pulses. If a fault current forces TIP and/or RING to a

more negative voltage than V

, current is conducted

through the trip circuit. When the speci鏗乪d trip cur-

rent level is reached, transistors PNPN1 and/or

PNPN2 will turn on and "crowbar" the majority of the

current to ground. If similar pulses force TIP and/or

RING to a more positive state than ground, diodes

D1 and/or D2 will conduct the pulse to ground. The

L7591 SLIC Protector is available in an 8-pin, plastic

DIP (L7591AB) and in an 8-pin, plastic SONB pack-

age (L7591AS).

Shunts lightning pulses to ground

鈥?Positive or negative 30 A, 10 x 1000

碌s

鈥?Positive or negative 40 A, 5 x 320

碌s

鈥?Positive or negative 80 A, 2 x 10

碌s

Power-cross protection

鈥?3.5 A

PEAK

, 50 Hz to 60 Hz, 1 s

鈥?5.0 A

PEAK

, 50 Hz to 60 Hz, 10 ms

Gate trigger current, 15 mA max

Up to 鈥?0 V capability

Holding current, 150 mA min

Pin Information

Table 1. Pin Description

(Applies to DIP and SONB packages)

Symbol

TIP

鈥?/div>

RING

GND

Name/Function

Tip signal from customer.

Supply voltage to gate

(鈥?0 V to 鈥?0 V).

Test Point, do not use.

Ring signal from customer.

Protected ring signal to line-feed-

circuitry.

Device ground/fault current

return.

Device ground/fault current

return.

Protected tip signal to line-feed

circuitry.

TIP

TRIP

CIRCUIT

PNPN1

7 GND

8 PT

TEST

POINT

PNPN2

TRIP

CIRCUIT

6 GND

RING

5 PR

12-1590 (C)

Figure 1. Functional and Pin Diagram

Note: Pins 1 and 4 must always be connected to the protection

resistors shown in Figures 4 and 5 (Line Feed Circuitry). The

SLIC can be connected either to the protected outputs (pins

5 and 8) or to the inputs (pins 1 and 4).

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