Datasheet > L8574D

L8574D

更新时间： 2024-10-18 22:31:39

品牌	Logo	应用领域
杰尔 - AGERE		继电器
页数	文件大小	规格书
36页	461K
描述
L8574D Resistive Subscriber Line Interface Circuit(SLIC), Ring Relay,and Protector(SRP)for Long Loop and TR-57 Applications

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L8574D 数据手册

Data Sheet

October 1998

L8574D Resistive Subscriber Line Interface Circuit (SLIC), Ring

Relay, and Protector (SRP) for Long Loop and TR-57 Applications

Included in the L8574 are a solid-state ringing

access switch and a line break switch. Also included

Features

is a relay driver for an external (test) access mechan-

ical relay.

■ Low-power scan mode for low on-hook power dis-

sipation (55 mW max)

State control is via four latched parallel data inputs. A

■ Low active power dissipation; talk or on-hook

chip select feature allows the user to enable, disable,

transmission (240 mW max)

or reset the data latches to a known logic state.

■ Distortion-free on-hook transmission

The L8574 offers a low-power scan state to minimize

power to less than 55 mW in the on-hook state. The

L8574 also supports on-hook transmission. The

■ Eight operating states via latched paralleled data

inputs with channel select feature

active power in both the talk or on-hook transmission

mode is also very low (<240 mW). Current is limited

to a ﬁxed value of 25 mA by an internal precision

■ Precision ﬁxed 28 mA current limiter

■ Integrated protection

current-limit circuit.

■ No external protection device required

Because of the internal architecture of the L8574

SLIC and because of the power rating of the associ-

ated external feed resistors, the L8574 will meet most

■ Integrated ringing access relay

■ Ring trip detector

surge requirements without use of an external sec-

ondary protection device. Internal circuitry steers

both positive and negative faults to fault ground. Neg-

■ Loop closure detector with hysteresis

■ Relay driver

ative faults are not dumped into battery.

■ Battery noise cancellation

The L8574 is a two-chip line interface solution pack-

aged in a single, 44-pin PLCC package. The Tip and

Ring drive ampliﬁers, the XMT ampliﬁer, the receive

■ Thermal protection

■ 44-pin, surface-mount, plastic package (PLCC)

interface, and battery noise cancellation circuits are

fabricated in a 90 V complementary bipolar (CBIC)

Description

process. The ring access switch, line break switch,

battery switch, current-limit, protection functions,

supervision, and control functions are fabricated in a

320 V dielectrically isolated bipolar-CMOS-DMOS

(BCDMOS) process. The device is available in a

44-pin PLCC package.

The L8574 is a resistive subscriber line interface cir-

cuit (SLIC) that is optimized for long loop applica-

tions, such as Bellcore TR-NWT-000057

requirements for digital loop carrier (DLC) applica-

tions. It interfaces the low-voltage circuits on an ana-

log line card to the Tip/Ring subscriber loop. The

L8574 does not supply dc current to the subscriber

loop; external resistors are used for this purpose.

12 3 4 5 6 7...36

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与L8574D相关器件

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