Datasheet > L8567

L8567

更新时间： 2024-10-18 22:31:39

品牌	Logo	应用领域
杰尔 - AGERE		/
页数	文件大小	规格书
42页	670K
描述
SLIC for Peoples Republic of China Applications

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L8567 数据手册

Data Sheet

August 1999

L8567 SLIC for

People’s Republic of China Applications

Features

Description

■ Low active power (typical 149 mW during on-hook

transmission)

General

This electronic subscriber loop interface circuit

(SLIC) is optimized for low cost and low power con-

sumption while providing a full-feature set.

■ Sleep state for low idle power (47 mW typical)

■ Quiet tip/ring polarity reversal

■ Distortion-free on-hook transmission

■ –35 V to –65 V battery operation

Included in the feature set is quiet reverse battery.

Quiet polarity reversal is possible because the ac

path is uninterrupted during transmission. The dc

loop current limit is user-adjustable via a single exter-

nal resistor. The maximum battery voltage is speci-

fied as –65 V for long loop applications. The L8567

supports on-hook transmission.

■ Convenient operating states:

— Forward active

— Polarity reversal active

— Sleep

— Forward disconnect

The total short loop off-hook power may be reduced

by use of a lower-voltage auxiliary battery supply. If,

when using the 32-pin PLCC, the user does not wish

to supply an auxiliary battery, the component of the

total short loop off-hook power that is dissipated on

the L8567 SLIC is controlled by use of an external

power resistor. With the 44-pin PLCC, a power resis-

tor is not necessary.

■ Supervision functions:

— Fixed threshold off-hook detector with

longitudinal rejection and hysteresis

— Ring trip detector

— Thermal shutdown indication

■ Adjustable loop current limit

■ Three driver outputs for relay driver

■ LED driver output to indicate off-hook

■ Latched parallel data interface

Included are both the loop closure and ring trip

supervision functions. The loop closure threshold is

fixed internally, which eliminates the need for an

external precision resistor to set the threshold. To

minimize noise at the supervision output, hysteresis

is included on the loop closure function. The loop clo-

sure and ring trip outputs are multiplexed into a sin-

gle NSTAT output. Also included is a thermal

shutdown mechanism. If device temperature exceeds

165 °C, as may be the case under an extended

power cross fault, the SLIC will shut down (i.e., enter

a high-impedance state) to provide protection against

the fault. A logic output will indicate the SLIC is in

thermal shutdown.

■ Battery and +5 V required:

— Optional auxiliary lower voltage battery to

reduce short loop power

■ –40 °C to +85 °C operational temperature range

■ User-selectable power management techniques

■ Thermal protection

■ 32-pin PLCC or 44-pin PLCC packaging

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