MH88510 Datasheet, PDF (1/10 Pages) Mitel Networks Corporation – Subscriber Line Interface Circuit (SLIC) Preliminary Information

MH88510/11
®
Subscriber Line Interface Circuit (SLIC)
Preliminary Information
Features
• High Gain version MH88511
• Compatible with popular MH88500
• Operates with a wide range of battery voltages
• Constant current battery feed
• Dry line compatible
• Overvoltage and short circuit protection
• Ringing Feed
• Off-hook detection and LED indicator drive
• Dial pulse detection
• Ring trip filter with auto ring trip
• Relay driver
• Transformerless 2-2 wire conversion
• Low power consumption
• Mute of incoming audio
• Few external components
Applications
• Line Interface for:
• PABX
• Intercoms
• Key Systems
ISSUE 1
Ordering Information
April 1995
MH88510
MH88511
20 Pin SIL Package
20 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88510/11 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 MH88510/11 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 which incorporates
various technologies for optimum circuit board and
very high reliability.
TF
TIP
RING
RF
Tip
Drive
Current &
Voltage
Sensing
Ring Short
Protection
2-2 Wire
Hybrid
Constant
Current/Voltage
Control
Ring Trip
Filter
MUTE
JUNC
Line
Supervision
Relay
Driver
VBAT AGND VDD VEE
SHK LED RRC RRD VRLY ^RGND
Figure 1 - Functional Block Diagram
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