IDT821621 Просмотр технического описания (PDF) - Integrated Device Technology

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IDT821621

LONG HAUL SLIC

Integrated Device Technology 

LONG HAUL SLIC

IDT821621

FEATURES

! SLIC operating states: Active, Ringing, Standby and

Disconnect

! Low standby power consumption (35 mW)

! −19 V to −58 V battery operation

! On-hook transmission

! Two-wire impedance set by single external impedance

! Programmable constant-current feed

! Programmable loop-detect threshold

! Programmable ring-trip detect threshold

! +3.3 V / +5 V compatible power supply

! No −5 V supply required

! On-chip Thermal Management (TMG)

! Four on-chip relay drivers and relay snubbers, 1 ringing and 3

general purpose

! Package available: 32 pin PLCC

DESCRIPTION

The IDT821621 is a long haul Subscriber Line Interface Circuit. It

implements the basic telephone line interface functions such as battery

feeding, impedance matching, off-hook detection and ring-trip detection.

The IDT821621 allows battery feeding between −19 V and −58 V

and has the capability for driving long loops. The architecture of

operating the SLIC in different states according to different loop states

minimizes the system power dissipation.

This long haul SLIC is pin-to-pin compatible with AMD7920. It

provides a cost-effective solution for PBX and Central Office

applications.

FUNCTIONAL BLOCK DIAGRAM

TMG

A (TIP)

HPA

Two-Wire

Interface

HPB

B (RING)

DA

DB

VBAT

BGND

The IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc.

 2003 Integrated Device Technology, Inc.

Relay Driver

Relay Driver

Relay Driver

Ring Relay Driver

Digital

Interface

Signal

Transm ission

Off-hook

Detector

Power Feed

Controller

Ring-trip

Detector

RYOUT3

RYOUT2

RYOUT1

RINGOUT

D1

D2

D3

C1

C2

DET

VTX

RSN

RD

RDC

CAS

VCC

1

VBREF

AGND

October 8, 2003

DSC-6225/1

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