HC-5509B3999-003
S E M I C O N D U C T O R
SLIC
Subscriber Line Interface Circuit
March 1996
Features
Description
• DI Monolithic High Voltage Process
The HC-5509B3999-003 telephone Subscriber Line Inter-
• Compatible with Worldwide PBX and CO Performance
Requirements
face Circuit integrates most of the BORSCHT functions on a
monolithic IC. The device is manufactured in a Dielectric Iso-
lation (DI) process and is designed for use as a high voltage
interface between the traditional telephone subscriber pair
(Tip and Ring) and the low voltage filtering and cod-
ing/decoding functions of the line card. Together with a sec-
ondary protection diode bridge and “feed” resistors, the
device will withstand 1000V lightning induced surges, in
plastic packages. The SLIC also maintains specified trans-
mission performance in the presence of externally induced
longitudinal currents. The BORSCHT functions that the SLIC
provides are:
• Controlled Supply of Battery Feed Current with Pro-
grammable Current Limit
• Operates with 5V Positive Supply (V
B+
)
• Internal Ring Relay Driver and a Utility Relay Driver
• High Impedance Mode for Subscriber Loop
• High Temperature Alarm Output
• Low Power Consumption During Standby Functions
• Switch Hook, Ground Key, and Ring Trip Detection
• Selective Power Denial to Subscriber
• Voice Path Active During Power Denial
• Battery Feed with Subscriber Loop Current Limiting
• Overvoltage Protection
• On-Chip Op Amp for 2-Wire Impedance Matching
• Ring Relay Driver
Applications
• Supervisory Signaling Functions
• Hybrid Functions (with External Op-Amp)
• Test (or Battery Reversal) Relay Driver
• Solid State Line Interface Circuit for PBX or Central
Office Systems, Digital Loop Carrier Systems
• Hotel/Motel Switching Systems
• Direct Inward Dialing (DID) Trunks
• Voice Messaging PBXs
In addition, the SLIC provides selective denial of power to
subscriber loops, a programmable subscriber loop current
limit from 20mA to 60mA, a thermal shutdown with an alarm
output and line fault protection. Switch hook detection, ring
trip detection and ground key detection functions are also
incorporated in the SLIC device.
• High Voltage 2-Wire/4-Wire, 4-Wire/2-Wire Hybrid
Ordering Information
TEMP.
RANGE ( C)
PKG.
NO.
o
The HC-5509B3999-003 SLIC is ideally suited for line card
designs in PBX and CO systems, replacing traditional
transformer solutions.
PART NUMBER
PACKAGE
HC9P5509B3999-003
0 to +75
28 Ld SOIC
M28.3
Pinout
HC-5509B3999-003 (SOIC)
TRUTH TABLE
TOP VIEW
F1
0
F0
0
ACTION
Normal Loop Feed
AG
1
2
28
27
26
25
24
23
22
21
20
19
18
17
16
15
BG
VB-
RF
VB+
0
1
RD Active
C
1
3
1
0
Power Down Latch RESET
Power on RESET
F1
4
TF
1
0
5
F0
RS
VFB
6
RD
DG
1
1
Loop Power
Denial Active
7
SHD
GKD
TST
8
PR
9
PRI
10
11
12
VTX
ALM
ILMT
OUT 1
C
2
VRX
RFS
RING
-IN 1 13
14
TIP
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
File Number 4126
Copyright © Harris Corporation 1996
1
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