1

®

FN4920.5

ISL5571A

Access High Voltage Switch

The ISL5571A is a solid state device designed to replace the

electromechanical relay used on Subscriber Line Cards. The

device contains two Line Break MOSFET switches, one Ring

Return MOSFET switch and one Ring Access SCR switch.

The ISL5571A is pin-for-pin compatible with the Lucent

L7581AAE LCAS and Clare CPCL7581A Products.

Max) higher dV/dt sensitivity (5000V/

µs), protection SCR

hold current set to 110mA.

The line break MOSFETs have very low on resistance

(<16.0

Ω Typ) and Ron match (<0.05Ω Typ, 0.5Ω Max) and a

blocking voltage >330V. The Ring Return MOSFET has a

typical Ron of 50

Ω and a blocking voltage >330V. The

Ringing Access switch is implemented with a SCR device

with a blocking voltage >480V. The SCR switch inherently

offers low EMI connect and disconnect circuitry. All control

I/Os use TTL thresholds making the device compatible with

3V logic.

The ISL5571A also includes on-chip protection in the form of

an over-voltage clamping circuit, current-limited MOSFET

switches, and thermal shutdown circuitry. The over-voltage

clamping circuit consists of a diode bridge and SCR.

Features

• Small Size/Surface-Mount Packaging

• Low Impulse Noise, Low EMI

• Clean, Bounce-Free Switching

• Line Break Switches

-0.5

-28

Ω Max r

ON

• Built-In Current Limiting, Thermal Shutdown and

Secondary Protection for the SLIC

• Optimized for Short Loop High REN Applications

• 3V/5V Logic-Capable I/O

• Pb-free Available

Applications

• Central Office

• PBX

•DLC

•HFC

•FITL

•DAML

Related Literature

• Technical Brief TB363 “Guidelines for Handling and

Processing Moisture Sensitive Surface Mount Devices

(SMDs)”

• Technical Brief TB379 “Thermal Characterization of

Packages for ICs”

• Texas Instruments TISPL758LF3D Data Sheet

• Teccor Electronics Document DO-214AA

Pinout

ISL5571A

TOP VIEW

Ordering Information

PART

NUMBER

PROT

SCR

TEMP

RANGE (°C)

PACKAGE

TYPE

PKG.

DWG. #

ISL5571AIB

Yes

-40 to 85

16 Ld SOIC

M16.3

ISL5571AIBZ

(Note)

Yes

-40 to 85

16 Ld SOIC

(Pb-free)

M16.3

NOTE: Intersil Pb-free products employ special Pb-free material

sets; molding compounds/die attach materials and 100% matte tin

plate termination finish, which is compatible with both SnPb and

Pb-free soldering operations. Intersil Pb-free products are MSL

classified at Pb-free peak reflow temperatures that meet or exceed

the Pb-free requirements of IPC/JEDEC J Std-020B.

Add “-T” for tape and reel.

14

15

16

9

13

12

11

10

1

2

3

4

5

7

6

8

NC

NC

NC

LATCH

INPUT

Data Sheet

July 2004

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Copyright © Intersil Americas Inc. 2001, 2002, 2004. All Rights Reserved

All other trademarks mentioned are the property of their respective owners.