MH88612BV-K
Subscriber Line Interface Circuit (SLIC)
Advance Information
DS5066
ISSUE 2
January 1999
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Transformerless 2-wire to 4-wire conversion
Battery and ringing feed to line.
Off-hook and dial pulse detection.
Ring ground over-current protection.
Constant current feed with constant voltage
foldover.
Relay driver.
Power Denial.
Wide Operating Range.
Pin for pin compatible 600R and 900R variants.
Ordering Information
MH88612BV-K
MH88612BV-4K
20 Pin SIL Package (600R)
20 Pin SIL Package (900R)
0∞ to 70∞
C
C
Description
The SLIC provides a complete interface between a
switching system and a subscriber loop. Functions
provided include battery feed and ringing feed to the
subscriber line, 2-Wire to 4-Wire hybrid interfacing,
constant current feed with constant voltage foldback,
and dial pulse detection. The device is fabricated
using thick film hybrid technology in a 20-pin single
in-line package.
Applications
Line interface for:
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PABX
Intercoms
Key Telephone Systems
Control Systems
LPGND
VBAT PD VCC VEE AGND
Constant
Voltage
Foldback
Power
Management
TF
TIP
RING
RF
Current and
Voltage
Sensing
2-Wire to
4-Wire
Conversion
VR
VX
RV
VRLY
Over Current
Protection
Relay
Drive
Circuit
Constant
Current
Feed
Loop
Supervision
CAP
RC
RD
CD
SHK
Figure 1 - Functional Block Diagram
1
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