MH88500 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information

MH88500
® _{Hybrid Subscriber Line Interface Circuit (SLIC)}
Preliminary Information
Features
• Differential to single ended conversion
• No transformers required
• Minimum installation space
• Off-Hook detection and LED indicator drive
• Relay drive output
• Battery and ringing feed to line
• Logic interface: MUTE, OFHK, RC
• Mute of incoming audio
• Dial pulse detection
• Voltage surge protection
Applications
Line Interface for:
• PABX
• Intercoms
• Key Systems
ISSUE 5
Ordering Information
April 1995
MH88500
20 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88500 Subscriber Line Interface Circuit
provides a complete interface between the telephone
line and a speech switch requiring only single
bidirectional switch per crosspoint. The functions
provided by the MH88500 include bidirectional
differential to single ended conversion in the speech
path, line battery feed, ringing feed and loop and dial
pulse detection. The device is fabricated as a thick
film hybrid in a 20-pin ‘single-in-line’ package
allowing optimum circuit board packing density.
TIP
RING
RING
FEED
CD
RD
RC
RGND
VA₁
V_A2
V_B
V_{C1 GND}
Loop Feed/
Ring Feed
Relay Drive
Circuit
Speech Circuit
V_A2
V_B
Loop Detection
V_C2
Figure 1 - Functional Block Diagram
JUNCTOR
MUTE
OFHK
LED
THRESH ADJ
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