®
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
ISSUE 1
April 1995
Ordering Information
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.
Applications
•
•
•
•
Line Interface for:
PABX
Intercoms
Key Systems
TF
TIP
Tip
Drive
2-2 Wire
Hybrid
Current &
Voltage
Sensing
Constant
Current/Voltage
Control
MUTE
JUNC
Ring Trip
Filter
RING
RF
Ring Short
Protection
Line
Supervision
Relay
Driver
VBAT AGND VDD VEE
SHK
LED
RRC
RRD VRLY RGND
Figure 1 - Functional Block Diagram
2-53
MITEL [ MITEL NETWORKS CORPORATION ]
