LE75181ASC datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Wireless rf/communication> Telecom circuit> LE75181ASC

LE75181ASC: DescriptionTelecom Circuit, 1-Func, PDSO16, PLASTIC, SOIC-16; CategoryWireless rf/communication Telecom circuit; File Size389KB，18 Pages; ManufacturerLegerity

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LE75181ASC Overview

Telecom Circuit, 1-Func, PDSO16, PLASTIC, SOIC-16

LE75181ASC Parametric

Parameter Name	Attribute value
Maker	Legerity
Parts packaging code	SOIC
package instruction	SOP,
Contacts	16
Reach Compliance Code	unknow
JESD-30 code	R-PDSO-G16
length	10.31 mm
Number of functions	1
Number of terminals	16
Maximum operating temperature	110 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Certification status	Not Qualified
Maximum seat height	2.65 mm
Nominal supply voltage	5 V
surface mount	YES
Telecom integrated circuit types	TELECOM CIRCUIT
Temperature level	INDUSTRIAL
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
width	7.5 mm

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™

Le75181

Ringing Access Switch

VE750 Series

APPLICATIONS

Central office

DLC

PBX

DAML

HFC/FITL

DESCRIPTION

The VoiceEdge™ family VE750 series of Line Card Access

Switches (LCAS) is a family of monolithic solid-state switches

that is designed to provide both power ringing access and test

access on the analog line card. These devices, while not a pin-

for-pin replacement for the traditional electromechanical relay

(EMR) solution, provide the equivalent switching functionality.

The VE750 series LCAS is meant as a solid-state alternative to

the EMRs.

The Le75181A/B device is pin-for-pin compatible with

Legerity’s L7581A/B device, and the Le75181C device is pin-

for-pin compatible with Legerity’s L8581A device.

Legerity also offers a range of compatible SLIC devices and

codec/filters that can be used with the VE750 series LCAS for

complete line card solutions that can be used worldwide in

analog line card applications.

FEATURES

Small size/surface-mount packaging

Monolithic IC reliability

Low impulse noise

Make-before-break, break-before-make operation

Clean, bounce-free switching

Low, matched ON-resistance

Built-in current limiting, thermal shutdown, and SLIC

protection

5 V only operation, very low power consumption

Battery monitor, all OFF state upon loss of battery

No EMI

Latched logic level inputs, no drive circuitry

Only one external protector required

TTL logic control compatible

Default power up state

BLOCK DIAGRAM

Le75181A/C

FGND

SCR

& Trip

Circuit

VBAT

TBAT

RBAT

TLINE

SW1

SW2

RLINE

TRINGING

RRINGING

SW3

SW4

LATCH

RELATED LITERATURE

081123 Le75282 Dual Intelligent Line Card Access

Switch Data Sheet

081126 Le75183 Line Card Access Switch Data Sheet

080754 Le58QL061/063 QLSLAC Data Sheet

080676 Le5711 Dual SLIC Data Sheet

081047 Le5712 Dual SLIC Data Sheet

FGND

VDD

INPUT

Temperature

Shutdown

TSD

DGND

Le75181B

VBAT

ORDERING INFORMATION

Device

LE75181ABSC

LE75181BBSC

LE75181CBSC

The green package meets RoHS Directive 2002/95/EC of the

European Council to minimize the environmental impact of

electrical equipment.

For delivery using a tape and reel packing system, add a "T" suffix

to the OPN (Ordering Part Number) when placing an order.

16-Pin SOIC, GULL (Green)

Tube

Package Type

Packing

TBAT

RBAT

TLINE

SW3

SW1

SW2

RLINE

SW4

TRINGING

RRINGING

LATCH

VDD

INPUT

Temperature Shutdown

TSD

DGND

Document ID#

081105 Date:

May 31, 2006

Rev:

Version: 1

Distribution:

Public Document

TABLE OF CONTENTS

Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Related literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Summary of Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Supply Currents and Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Device Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Zero Cross Current Turn Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Switching Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Loss of Battery Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Impulse Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Integrated SLIC Device Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

16-Pin, Plastic SOIC (GULL) (ASC/BSC/CSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Revision A1 to B1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Revision B1 to C1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Revision C1 to D1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Revision D1 to E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Le75181 VE750 Series Data Sheet

PRODUCT DESCRIPTION

The Le75181 Ringing Access Switch is a monolithic solid-state device that provides the switching functionality of a two-form C

switch.

The Le75181 is designed to provide power ringing access to tip and ring in central office, digital loop carrier, private branch

exchange, digitally added main line, and hybrid fiber coax/fiber-in-the-loop analog line card applications. The Le75181 has three

states: the idle talk state (line break switches closed, ringing access switches open), power ringing state (line break switches

open, ringing access switches closed), and all OFF state.

The Le75181 offers break-before-make or make-before-break switching, with simple logic level input control. Because of the

solid-state construction, voltage transients generated when switching into an inductive ringing load during ring cadence or ring

trip are minimized, possibly eliminating the need for external zero cross switching circuitry. State control is via logic level inputs,

so no additional driver circuitry is required.

The line break switch is a linear switch that has exceptionally low ON-resistance and an excellent ON-resistance matching

characteristic. The ringing access switch has a breakdown voltage rating >480 V which is sufficiently high, with proper protection,

to prevent breakdown in the presence of a transient fault condition (i.e., passing the transient on to the ringing generator).

Incorporated into the Le75181A and Le75181C is a diode bridge/SCR clamping circuit, current-limiting circuitry, and a thermal

shutdown mechanism to provide protection to the SLIC device and subsequent circuitry during fault conditions (see block

diagram). Positive and negative lightning is reduced by the current-limiting circuitry and steered to ground via diodes and the

integrated SCR. Power cross is also reduced by the current-limiting and thermal shutdown circuits.

The Le75181B version provides only an integrated diode bridge along with current limiting and thermal shutdown, as shown in

the block diagram. This will cause positive faults to be directed to ground and negative faults to battery. In either polarity, faults

are reduced by the current-limit and/or thermal shutdown mechanisms.

The default power up state is in Idle/Talk state unless otherwise being overwritten by external controls.

To protect the Le75181 from an overvoltage fault condition, use of a secondary protector is required. The secondary 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 Le75181 will meet all relevant ITU-T, LSSGR, FCC, or UL* protection

requirements.

The Le75181 operates off of a 5-V supply only. This gives the device extremely low idle and active power dissipation and allows

use with virtually any range of battery voltage. This makes the Le75181 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 Le75181, only as a reference for the integrated protection circuit. The Le75181 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 will draw a nominal 2 mA from the ring

generator.

The Le75181ASC/BSC/CSC device is packaged in a 16-pin, plastic SOIC (GULL) package.

Le75181 VE750 Series Data Sheet

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