50
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
HC5503T
Balanced PBX/Key System SLIC,
Subscriber Line Interface Circuit
The Intersil HC5503T is a low cost Subscriber Line Interface
Circuit (SLIC) that replaces the components of a discrete
Transformer Analog circuit design. The monolithic integrated
design provides improved performance and system reliability.
The HC5503T provides: Current limited DC feed to the
subscriber loop, maintains a flat frequency response over the
voice band and beyond, has self resetting thermal protection
that allows conversation to continue while the fault is
present, provides a TTL subscriber off hook indication even
in the presence of longitudinal currents, and limits system
power consumption on short loops.
The HC5503T provides balanced 2-wire transmission and
has excellent longitudinal balance, while providing on hook
transmission and longitudinal current rejection in both the
on-hook or off-hook conditions.
The SLIC needs only one +5V supply in addition to the main
battery supply for loop current and operates over a range of
battery voltages (-24V to -58V).
Available in 22PDIP AND 24SO packaging. The HC5503T is
ideally suited as a replacement for discrete line circuits in
low cost analog PABXs, small Office/Home Office products
or Small Key Systems.
Features
Monolithic Integrated Device
Controlled Supply of Battery Feed Current for Short Loops
(30mA)
Single +5V Supply
Allows Interfacing With All Ringing Systems
Switch Hook Detection
Compatible With Worldwide PBX Performance
Requirements
Low Power Consumption During Standby
Applications
PBX Switches (Analog, Digital or ISDN)
Key Telephone Systems (KTS)
ISDN PC Plug in Modems
ISDN Small Office / Home Office (SOHO) Terminal
Adapters (TA)
CTI (Computer Telephony Integration) Products
Block Diagram
Ordering Information
PART NUMBER
TEMP.
RANGE (
o
C)
PACKAGE
PKG. NO.
HC5503TCP
0 to 75
22 Ld PDIP
E22.4
HC5503TCB
0 to 75
24 Ld SOIC
M24.3
LOOP FEED
SPEECH CIRCUIT
LOOP DETECTOR
BIAS
V
CC
AGND
DGND
V
BAT
RF
TF
BGND
TIP
RING
C1
TX
RX
SHD
RS
Data Sheet
June 1998
File Number
4506
51
Absolute Maximum Ratings
(Note 1)
Thermal Information
Maximum Continuous Supply Voltages
(V
BAT
). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -60 to 0.5V
(V
CC
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to 7V
(V
CC
- V
BAT
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75V
Relay Drive Voltage (V
RD
) . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to 15V
Operating Conditions
Temperature Range
HC-5503T-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to 75
o
C
Positive Supply Voltage (V
CC
) . . . . . . . . . . . . . . . . . . 4.75V to 5.25V
Negative Supply Voltage (V
BAT
) . . . . . . . . . . . . . . . . . .-24V to -58V
High Level Logic Input Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . 2.4V
Low Level Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . 0.6V
Thermal Resistance (Typical, Note 2)
JA
(
o
C/W)
PDIP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
53
SOIC Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
75
Maximum Junction Temperature (Plastic Package) . . . . . . . . .150
o
C
Maximum Storage Temperature Range . . . . . . . . . . -65
o
C to 150
o
C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300
o
C
(SOIC - Lead Tips Only)
Die Characteristics
Transistor Count. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Diode Count. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Die Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 x 102
Substrate Potential. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Connected
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar-DI
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. Absolute maximum ratings are limiting values, applied individually, beyond which the serviceability of the circuit may be impaired. Functional
operability under any of these conditions is not necessarily implied.
2.
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
Unless Otherwise Specified, V
BAT
= -48V, V
CC
= 5V, AG = BG = DG = 0V, Typical Parameters
T
A
= 25
o
C. Min-Max Parameters are Over Operating Temperature Range
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Off Hook I
B
+
R
L
= 600
,
T
A
= 25
o
C
-
-
5.3
mA
Off Hook I
B
-
R
L
= 600
-
-
39
mA
Off Hook Loop Current
R
L
= 1200
-
21
-
mA
Off Hook Loop Current
R
L
= 1200
, V
BAT
= -42V, T
A
= 25
o
C
17.5
-
-
mA
Off Hook Loop Current
R
L
= 200
25.5
30
34.5
mA
Switch Hook Detection Threshold
SHD = V
OL
10
-
-
mA
SHD = V
OH
-
-
5
mA
Dial Pulse Distortion
0
-
5
s
Longitudinal Balance
1V
RMS
200Hz - 3400Hz, (Note 3) IEEE Method
0
o
C
T
A
75
o
C
2-Wire Off Hook
-
65
-
dB
2-Wire On Hook
-
63
-
dB
Tip and Ring to TX, Off Hook
-
58
-
dB
Insertion Loss
At 1kHz, 0dBm Input Level, Referenced 600
-
0.05
0.2
dB
2-Wire to TX, RX to 2-Wire
Frequency Response
200 - 3400Hz Referenced to Absolute Loss at 1kHz and
0dBm Signal Level (Note 3)
-
0.02
0.05
dB
Idle Channel Noise
(Note 3)
-
1
5
dBrnC
2-Wire to TX, RX to 2-Wire
-
-89
-85
dBm0p
Trans Hybrid Loss
RX to TX
Balance Network Set Up for 600
Termination at 1kHz
-
40
-
dB
Overload Level, 2-Wire to TX, RX to 2-Wire
V
CC
= +5V, (Note 3)
2.5
-
-
V
Peak
HC5503T
52
Pinouts
Level Linearity
2-Wire to TX, RX to 2-Wire
At 1kHz, (Note 3) Referenced to 0dBm Level
+3 to -40dBm
-
-
0.05
dB
-40 to -50dBm
-
-
0.1
dB
-50 to -55dBm
-
-
0.3
dB
Power Supply Rejection Ratio
(Note 3)
V
CC
to 2-Wire
200 - 3400kHz, R
L
= 600
-
40
-
dB
V
CC
to Transmit
-
40
-
dB
V
BAT
to 2-Wire
-
40
-
dB
V
BAT
to Transmit
-
40
-
dB
Logic Input Current (RS, RC)
0V
V
IN
5V
-
-
100
A
Logic Inputs (RS, RC)
Logic `0' V
IL
-
-
0.8
V
Logic `1' V
IH
2.0
-
5.5
V
Logic Output (SHD)
Logic `0' V
OL
I
LOAD
800
A, V
CC
= 5V
-
0.1
0.5
V
Logic `1' V
OH
I
LOAD
40
A, V
CC
= 5V
2.7
-
5.0
V
NOTES:
3. These parameters are controlled by design or process parameters and are not directly tested. These parameters are characterized upon initial
design release, upon design changes which would affect these characteristics, and at intervals to assure product quality and specification com-
pliance.
Electrical Specifications
Unless Otherwise Specified, V
BAT
= -48V, V
CC
= 5V, AG = BG = DG = 0V, Typical Parameters
T
A
= 25
o
C. Min-Max Parameters are Over Operating Temperature Range (Continued)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
HC5503T
(PDIP)
TOP VIEW
HC5503T
(SOIC)
TOP VIEW
1
2
3
4
5
6
7
8
9
10
11
14
15
16
17
18
19
20
21
22
13
12
TIP
RING
DGND
RS
N/C
RF
V
BAT
TX
N/C
T3
N/C
AGND
T1
C1
RX
T2
N/C
N/C
SHD
TF
V
CC
BGND
1
2
3
4
5
6
7
8
9
10
11
12
16
17
18
19
20
21
22
23
24
15
14
13
TIP
RING
C1
DGND
RS
TF
RF
BGND
TX
N/C
T3
N/C
AGND
T1
N/C
RX
T2
N/C
N/C
N/C
SHD
N/C
V
CC
V
BAT
HC5503T
53
Pin Descriptions
22 PIN
PDIP
24 PIN
SOIC
SYMBOL
DESCRIPTION
1
1
TIP
An analog input connected to the TIP (more positive) side of the subscriber loop through a 150
feed resistor.
Functions with the Ring terminal to receive voice signals from the telephone and for loop
monitoring purposes.
2
2
RING
An analog input connected to the RING (more negative) side of the subscriber loop through a 150
feed re-
sistor. Functions with the Tip terminal to receive voice signals from the telephone and for loop monitoring
purposes.
3
3
V
CC
Positive Voltage Source - Most positive supply. V
CC
is typically 5V.
4
N/C
No Connect. For proper operation this pin should be left floating.
4
5
C
1
Capacitor - An external capacitor to be connected between this terminal and analog ground. Required for
proper operation of the voice band hybrid. Typical value is 0.3
F, 30V.
5
6
DGND
Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and outputs
on the SLIC microcircuit.
6
7
RS
This pin should be tied to 5V.
7
8
N/C
No Connect. For proper operation this pin should be left floating.
8
9
TF
Tip Feed - A low impedance analog output connected to the TIP terminal through a 150
feed resistor. Pro-
vides voice signals to the telephone set and sink longitudinal current.
9
10
RF
Ring Feed - A low impedance analog output connected to the RING terminal through a 150
feed resistor.
Functions with the TF terminal to provide loop current, feed voice signals to the telephone set, and sink lon-
gitudinal current.
10
11
V
BAT
Negative Voltage Source - Most negative supply. V
BAT
has an operational range of -24V to -58V.
Frequently referred to as "battery".
11
12
BGND
Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows into
this ground terminal.
12
13
SHD
Switch Hook Detection - A low active LS TTL - compatible logic output. This output is enabled for loop cur-
rents exceeding 10mA and disabled for loop currents less than 5mA.
13
14
N/C
No Connect. For proper operation this pin should be left floating.
15
N/C
No Connect. For proper operation this pin should be left floating.
14
16
N/C
No Connect. For proper operation this pin should be left floating.
15
17
N/C
No Connect. For proper operation this pin should be left floating.
16
18
T1
Used during production testing. For proper operation this pin should be connected to pin T2.
17
19
T2
Used during production testing. For proper operation this pin should be connected to pin T1.
18
20
T3
Used during production testing. For proper operation this pin should be connected to Analog Ground pin
AGND.
19
21
RX
Receive Input - A high impedance analog input which is internally biased. Capacitive coupling to this input is
required. AC signals appearing at this input differentially drive the Tip feed and Ring feed terminals, which in
turn drive tip and ring through 300
of feed resistance on each side of the line.
20
22
N/C
No Connect. For proper operation this pin should be left floating.
21
23
AGND
Analog Ground - To be connected to zero potential and serves as a reference for the transmit output (TX)
and receive input (RX) terminals.
22
24
TX
Transmit Output - A low impedance analog output which represents the differential voltage across Tip and
Ring. This output is unbalanced and referenced to analog ground. Since the DC level of this output varies
with loop current, capacitive coupling to the next stage is essential.
NOTE: All grounds (AGND, BGND, and DGND) must be applied before V
CC
or V
BAT
. 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.
HC5503T
54
All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site http://www.intersil.com
Applications Diagram
Typical Component Values
C
1
= 0.3
F, 30V,
20%
C
2
= 0.01
F, 100V,
20%
C
3
= 0.01
F, 20V,
20%
C
4
= 0.5
F, 20V,
20%
C5 = 0.5
F, 30V,
20%
R
B1
= R
B2
= R
B3
= R
B4
= 150
PTC used as ring generator ballast.
NOTES:
4. Secondary protection diode bridge recommended is a 2A, 200V type.
5. All grounds (AG, BG, and DG) must be applied before V
CC
or V
BAT
. 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.
6. Application shows Ring Injected Ringing.
R
B4
RING
RING FEED
TIP
V
BAT
SLIC
HC5503T
R
B2
R
B1
RING
R
B3
SUBSCRIBER
LOOP
-48V
SYSTEM CONTROLLER
1
9
10
2
TIP FEED
TIP
RX
TX
C1
V
BAT
BGND DGND AGND
V
CC
SHD
13
11
12
6
23
C
3
3
V
CC
C
2
C
1
21
24
20
19
18
5
C
4
C
5
5V
PRIMARY
PROTECTION
(NOTE 4)
PIN NUMBERS GIVEN FOR SOIC PACKAGE.
K
1A
PTC
Z
1
-48V
RING GENERATOR
RS
7
T3
T2
T1
FIGURE 1. TYPICAL LINE CIRCUIT APPLICATION WITH THE MONOLITHIC SLIC
K
1A
HC5503T
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