Integrated Device Technology, Inc. reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance
and to supply the best possible product. IDT does not assume any responsibility for use of any circuitry described other than the circuitry embodied in an IDT product. The
Company makes no representations that circuitry described herein is free from patent infringement or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent, patent rights or other rights, of Integrated Device Technology, Inc.
LIFE SUPPORT POLICY
Integrated Device Technology's products are not authorized for use as critical components in life support devices or systems unless a specific written agreement pertaining to
such intended use is executed between the manufacturer and an officer of IDT.
1. Life support devices or systems are devices or systems which (a) are intended for surgical implant into the body or (b) support or sustain life and whose failure to perform,
when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
2. A critical component is any components of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device
or system, or to affect its safety or effectiveness.
LONG HAUL SLIC
IDT821621
FEATURES
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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.
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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
FUNCTIONAL BLOCK DIAGRAM
TMG
Relay Driver
Relay Driver
Relay Driver
A (TIP)
Ring Relay Driver
HPA
Digital
Interface
Two-Wire
Interface
Signal
Transm ission
HPB
Off-hook
Detector
B (RING)
Power Feed
Controller
DA
DB
VBAT
BGND
VCC
The IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc.
RYOUT3
RYOUT2
RYOUT1
RINGOUT
D1
D2
D3
C1
C2
DET
VTX
RSN
RD
RDC
CAS
Ring-trip
Detector
VBREF
AGND
1
2003 Integrated Device Technology, Inc.
October 8, 2003
DSC-6225/1
Table of Contents
Features ....................................................................................................................................................................................................................... 1
SLIC States Control ......................................................................................................................................................................................... 7
Relay Drivers Control ....................................................................................................................................................................................... 8
DC Feeding ...................................................................................................................................................................................................... 8
Receive Gain Setting ....................................................................................................................................................................................... 9
DC Electrical Characteristics ................................................................................................................................................................................... 10
AC Electrical Characteristics ................................................................................................................................................................................... 11
Test Circuits .............................................................................................................................................................................................................. 15
Ordering Information ................................................................................................................................................................................................ 19
DC Feeding Characteristics ................................................................................................................................................................... 8
DC Feed Programming Circuit............................................................................................................................................................... 8
Two-Wire AC Input Impedance Programming Network ....................................................................................................................... 11
Two-Wire Return Loss ......................................................................................................................................................................... 15
Four-Wire Longitudinal Signal Generation........................................................................................................................................... 16
Four-to-Two Wire Gain and Four-to-Four Wire Gain ........................................................................................................................... 17
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