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MH88600
Global SLIC
Preliminary Information
Features
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Programmable line impedance matching
Internal complex impedance networks
Transformerless 2-4 wire conversion
Programmable transmit/receive gain
Accommodates worldwide transmission
standards
Operates with a wide range of battery voltages
Adjustable constant current battery feed
Overvoltage and short circuit protection
Switch hook and ground button detection
Ring trip filter and relay driver
Low power consumption
High power dissipation capability during fault
conditions
MH88600
ISSUE 7
April 1995
Ordering Information
40 Pin DIL Hybrid
0°C to 70°C
Description
The MH88600 is a SLIC (Subscriber Line Interface
Circuit) which provides all of the BORSCH functions
of Battery Feed, Overvoltage Protection, Ringing
Feed, Line Supervision and 2-4 Wire Hybrid
conversion. In addition, the device matches the
many different line impedances specified by
regulatory authorities of around the world.
Applications
Line interface for:
• PABXs
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Control Systems
Key Telephone Systems
Central Office Equipment
VREF
TF1
TF2
Tip Drive
Constant
Current
Battery Feed
Impedance Matching Network
PG2
2-4 Wire
Hybrid
Circuit
PG4
Gain Adjust
TX
PG3
PG1
LCA
ZN14 ZN13.................ZN8
ZN7.....................ZN1 ZN0
TIP
RING
Over Voltage &
Short Circuit
Protection
RF1
Ring Trip Filter
Ring Drive
Line Supervision
Relay Driver
RF2
Vbat
EGB
SHK
Figure 1 - Functional Block Diagram
2-83
GNDBat
GNDA
VRR
VDD
VEE
RC
RD
MITEL [ MITEL NETWORKS CORPORATION ]
