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PDF HC-5524 Data sheet ( Hoja de datos )
| Número de pieza | HC-5524 | |
| Descripción | EIA/ITU 24V PABX SLIC with 25mA Loop Feed | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
HC-5524
February 1999
File Number 2798.6
EIA/ITU 24V PABX SLIC with 25mA
Loop Feed
The HC-5524 telephone Subscriber Line Interface Circuit
integrates most of the BORSCHT functions on a monolithic
IC. The device is manufactured in a Dielectric Isolation (DI)
process and is designed for use as a 24V interface between
the traditional telephone subscriber pair (Tip and Ring) and
the low voltage filtering and coding/decoding functions of the
line card. Together with a secondary protection diode bridge,
the device will withstand 500V induced surges, in plastic
packages. The SLIC also maintains specified transmission
performance in the presence of externally induced
longitudinal currents. The BORSCHT functions that the SLIC
provides are:
• Battery Feed with Subscriber Loop Current Limiting
• Overvoltage Protection
• Ring Relay Driver
• Supervisory Signaling Functions
• Hybrid Functions (with External Op-Amp)
• Test (or Battery Reversal) Relay Driver
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.
The HC-5524 SLIC is ideally suited for line card designs in
PBX and DLC systems, replacing traditional transformer
solutions.
Ordering Information
PART NUMBER
HC4P5524-9
HC9P5524-5
TEMP.
RANGE (oC)
PACKAGE
-40 to 85 44 Ld PLCC
0 to 75 28 Ld SOIC
PKG.
NO.
N44.65
M28.3
Features
• DI Monolithic High Voltage Process
• Compatible with Worldwide PBX and DLC Performance
Requirements
• Controlled Supply of Battery Feed Current with
Programmable Current Limit
• Operates with 5V Positive Supply (VB+)
• 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
• On-Chip Op Amp for 2-Wire Impedance Matching
Applications
• Solid State Line Interface Circuit for PBX or Digital Loop
Carrier Systems
• Hotel/Motel Switching Systems
• Direct Inward Dialing (DID) Trunks
• Voice Messaging PBXs
• 2-Wire/4-Wire, 4-Wire/2-Wire Hybrid
• Related Literature
- AN9607, Impedance Matching Design Equations
- AN9628, AC Voltage Gain
- AN9608, Implementing Pulse Metering
- AN549, The HC-5502S/4X Telephone Subscriber Line
Interface Circuits (SLIC)
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
1 page  
HC-5524
Pin Descriptions (Continued)
SOIC PLCC SYMBOL
DESCRIPTION
14 22
TIP An analog input connected to the TIP (more positive) side of the subscriber loop through a feed resistor and
ring relay contact. Functions with the RING terminal to receive voice signals from the telephone and for loop
monitoring purposes.
15 24 RING An analog input connected to the RING (more negative) side of the subscriber loop through a feed resistor.
Functions with the TIP terminal to receive voice signals from the telephone and for loop monitoring purposes.
16 25
RFS
Ring Feed Sense - Senses RING side of the loop for Ground Key Detection. During Ring injected ringing the
ring signal at this node is isolated from RF via the ring relay. For Tip injected ringing, the RF and RFS pins must
be shorted.
17 27
VRX Receive Input, 4-Wire Side - A high impedance analog input. AC signals appearing at this input drive the Tip
Feed and Ring Feed amplifiers differentially.
18 31
C2 Capacitor #2 - An external capacitor to be connected between this terminal and ground. It prevents false ring
trip detection from occurring when longitudinal currents are induced onto the subscriber loop from power lines
and other noise sources. This capacitor should be nonpolarized.
19 32
VTX Transmit Output, 4-Wire Side - A low impedance analog output which represents the differential voltage across
TIP and RING. Transhybrid balancing must be performed beyond this output to completely implement two to
four wire conversion. This output is referenced to analog ground. Since the DC level of this output varies with
loop current, capacitive coupling to the next stage is necessary.
20 33
PRI A TTL compatible input used to control PR. PRI active High = PR active low.
21 34
PR An active low open collector output. Can be used to drive a Polarity Reversal Relay.
22 35
DG Digital Ground - To be connected to zero potential. Serves as a reference for all digital inputs and outputs on
(Note 4) the SLIC.
23 36
RD Ring Relay Driver - An active low open collector output. Used to drive a relay that switches ringing signals onto
the 2-Wire line.
24 37
VFB Feedback input to the tip feed amplifier; may be used in conjunction with transmit output signal and the spare
(Note 5) op-amp to accommodate 2-Wire line impedance matching. (This is not used in the typical applications circuit).
25 38
NA 39
26 41
TF2 Tip Feed - A low impedance analog output connected to the TIP terminal through a feed resistor. Functions
with the RF terminal to provide loop current, and to feed voice signals to the telephone set and to sink longitu-
dinal currents. Must be tied to TF1.
TF1 Tie directly to TF2 in the PLCC application.
RF1 Ring Feed - A low impedance analog output connected to the RING terminal through a feed resistor. Functions
with the TF terminal to provide loop current, feed voice signals to the telephone set, and to sink longitudinal
currents. Tie directly to RF2.
NA 42
RF2 Tie directly to RF1 in the PLCC application.
27 43
VB- The battery voltage source. The most negative supply.
28 44
BG Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows into this
(Note 4) ground terminal.
1, 5, 6, 7,
14, 15,
16, 21,
23, 26,
28, 29,
30, 40
NC No internal connection.
NOTES:
4. All grounds (AG, BG, and DG) must be applied before VB+ or VB-. Failure to do so may result in premature failure of the part. If a user wishes
to run separate grounds off a line card, the AG must be applied first.
5. Although not used in the typical applications circuit, VFB may be used in matching complex 2-Wire impedances.
5
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