MH88612C Datasheet, PDF (1/8 Pages) Mitel Networks Corporation – Subscriber Line Interface Circuit Preliminary Information

MH88612C
®
Subscriber Line Interface Circuit
Preliminary Information
Features
• Input impedance 200Ω + 560Ω // 0.1µF
• Transformerless 2-wire to 4-wire conversion
• Battery and ringing feed to line
• Off-hook and dial pulse detection
• Ring ground over-current protection
• Adjustable constant current feed
• Relay drive output
• Power VBat Denial
• Wide Operating Range
• Programmable Receive Gain
Applications
Line interface for:
• PABX
• Intercoms
• Key Telephone Systems
• Control Systems
ISSUE 4
April 1995
Ordering Information
MH88612C 20 Pin SIL Package
0°C to 70°C
Description
The SLIC provides a complete interface between a
switching system and subscriber loop. Functions
provided include battery feed and ringing feed to the
subscriber line, 2-Wire to 4-Wire hybrid interfacing,
constant current feed and dial pulse detection. The
device is fabricated using thick film hybrid
technology in a 20-pin single in-line package.
VBat
VDD VEE GNDA
GS
TF
TIP
RING
RF
RV
VRLY
RC
RD
Relay
Drive
Circuit
Current & Voltage
Sensing
Over Current
Protection
Constant
Current
Feed
2-Wire to
4-Wire
Conversion
Loop
Supervision
SHK
FIgure 1 - Functional Block Diagram
VR
VX
VRef
CAP
2-113