MH88500IN Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – Hybrid Subscriber Line Interface Circuit (SLIC) Preliminary Information

MH88500IN
®
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 1
Ordering Information
April 1995
MH88500IN 20 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88500IN 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 MH88500IN 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.
VA₁
V_A2
V_B
V_{C1 GND}
TIP
RING
RING
FEED
CD
RD
RC
RGND
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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