MH88612 Datasheet, PDF (1/8 Pages) Mitel Networks Corporation – Subscriber Line Interface Circuit (SLIC) Preliminary Information

MH88612
®
Subscriber Line Interface Circuit (SLIC)
Preliminary Information
Features
• 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 V_Bat Denial
• Wide operating range
Applications
Line interface for:
• PABX
• Intercoms
• Key Telephone Systems
• Control Systems
ISSUE 4
Ordering Information
MH88612 20 Pin SIL Package
April 1995
0°C to 70°C
Description
The SLIC provides a complete interface between a
switching system and a 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.
TF
TIP
RING
RF
RV
VRLY
RC
RD
CD
LPGND
VBat
PD
Power
Denial
Current & Voltage
Sensing
VDD VEE AGND
2-Wire to
4-Wire
Conversion
Relay
Drive
Circuit
Constant
Current
Feed
Over Current
Protection
Loop
Supervision
SHK
FIgure 1 - Functional Block Diagram
VR
VX
VRef
CAP
2-105