CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2002. All Rights Reserved
8-19
Description
The Intersil SLIC incorporates many of the BORSHT functions
on a single IC chip. This includes DC battery feed, a ring relay
driver, supervisory and hybrid functions. This device is
designed to maintain transmission performance in the pres-
ence of externally induced longitudinal currents. Using the
unique Intersil dielectric isolation process, the SLIC can oper-
ate directly with a wide range of station battery voltages.
The SLIC also provides selective denial of power. If the PBX
system becomes overloaded during an emergency, the SLIC
will provide system protection by denying power to selected
subscriber loops.
The Intersil SLIC is ideally suited for the design of new digital
PBX systems by eliminating bulky hybrid transformers.
Ordering Information
PART
NUMBER
TEMPERATURE
RANGE
PACKAGE
HC1-5504DLC-5
0
o
to +75
o
C
24 Lead Ceramic DIP
HC1-5504DLC-9
-40
o
to +85
o
C
24 Lead Ceramic DIP
HC3-5504DLC-5
0
o
to +75
o
C
24 Lead Plastic DIP
HC3-5504DLC-9
-40
o
to +85
o
C
24 Lead Plastic DIP
HC4P5504DLC-5
0
o
to +75
o
C
28 Lead PLCC
HC4P5504DLC-9
-40
o
to +85
o
C
28 Lead PLCC
HC9P5504DLC-5
0
o
to +75
o
C
24 Lead SOIC
HC9P5504DLC-9
-40
o
to +85
o
C
24 Lead SOIC
Features
Pin for Pin Replacement for the HC-5504
Capable of +5V or +12V (
V
B
+
) Operation
Monolithic Integrated Device
DI High Voltage Process
Compatible With Worldwide PBX Performance
Requirements
Controlled Supply of Battery Feed Current for Short
Loops (41mA)
Internal Ring Relay Driver
Allows Interfacing With Negative Superimposed Ring-
ing Systems
Low Power Consumption During Standby
Switch Hook Ground Key and Ring Trip Detection
Functions
Selective Denial of Power to Subscriber Loops
Applications
Solid State Line Interface Circuit for Analog and Digi-
tal PBX Systems
Direct Inward Dial (DID) Trunks
Voice Messaging PBXs
Allows Multi-Phone Operation
May 1997
Pinouts
HC-5504DLC (PDIP, CDIP, SOIC)
TOP VIEW
HC-5504DLC (PLCC)
TOP VIEW
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
C3
DG
RS
TF
RF
BG
TX
C4
+IN
C2
AG
OUT
V
B
+
R
X
-IN
RC
PD
GKD
SHD
RD
RFS
V
B
-
C3
DG
N/C
RS
RD
TF
RX
+IN
N/C
OUT
C2
RC
RING
TI
P
TX
AG
C4
-IN
RF
BG
N/C
SH
D
GK
D
PD
V
B
+
N/C
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
1
2
3
RF
S
V
B
-
HC-5504DLC
SLIC
Subscriber Line Interface Circuit
File Number
2443.3
NOT RE
COMME
NDED F
OR NEW
DESIG
NS
See HC
5504B a
nd HC5
504B1
or cont
act our
Techni
cal Sup
port Ce
nter at
1-888-IN
TERSIL
or www
.intersil
.com/ts
c
8-20
Specifications HC-5504DLC
Absolute Maximum Ratings
(Note 1)
Operating Conditions
Maximum Continuous Supply Voltages
(V
B
-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -60 to +0.5 V
(V
B
+) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5 to +15 V
(V
B
+ - V
B
-) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +75V
Relay Drive Voltage (V
RD
) . . . . . . . . . . . . . . . . . . . . . . .-0.5 to +15V
Junction Temperature Ceramic . . . . . . . . . . . . . . . . . . . . . . +175
o
C
Junction Temperature Plastic. . . . . . . . . . . . . . . . . . . . . . . . +150
o
C
Lead Temperature (Soldering 10 Sec.) . . . . . . . . . . . . . . . . +300
o
C
Operating Temperature Range
HC-5504DLC-5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
o
C to +75
o
C
HC-5504DLC-9 . . . . . . . . . . . . . . . . . . . . . . . . . . . -40
o
C to +85
o
C
Storage Temperature Range . . . . . . . . . . . . . . . . . . -65
o
C to 150
o
C
Relay Driver Voltage (V
RD
) . . . . . . . . . . . . . . . . . . . . . . . +5 to +12V
Positive Supply Voltage (V
B
+). . . . . . . 4.75 to 5.25 or 10.8 to 13.2V
Negative Supply Voltage (V
B
-) . . . . . . . . . . . . . . . . . . . . -42 to -58V
High Level Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 2.4V
Low Level Logic Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 0.6V
Loop Resistance (R
L
) . . . . . . . . . . . . . . . . . . . . . . . . . 200 to 1200
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.
Electrical Specifications
Unless Otherwise Specified, V
B
- = -48V, V
B
+ = +12V and +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
On Hook Power Dissipation
I
LONG
* = 0, V
B
+ = +12V
-
170
235
mW
Off Hook Power Dissipation
R
L
= 600
, I
LONG
* = 0, V
B
+ = +12V
-
425
550
mW
Off Hook IB+
R
L
= 600
, I
LONG
* = 0, T
A
= -40
o
C
-
-
6.0
mA
Off Hook IB+
R
L
= 600
, I
LONG
* = 0, T
A
= +25
o
C
-
-
5.3
mA
Off Hook IB-
R
L
= 600
, I
LONG
* = 0
-
35
41
mA
Off Hook Loop Current
R
L
= 1200
, I
LONG
* = 0
-
21
-
mA
Off Hook Loop Current
R
L
= 1200
, V
B
- = -42V, I
LONG
* = 0
T
A
= +25
o
C
17.5
-
-
mA
Off Hook Loop Current
R
L
= 200
, I
LONG
* = 0
36
41
48
mA
Fault Currents
TIP to Ground
-
14
-
mA
RING to Ground
-
55
-
mA
TIP to RING
-
41
-
mA
TIP and RING to Ground
-
55
-
mA
Ring Relay Drive V
OL
I
OL
= 62mA
-
0.2
0.5
V
Ring Relay Driver Off Leakage
V
RD
= +12V, RC = 1 = HIGH, T
A
= +25
o
C
-
-
100
A
Ring Trip Detection Period
R
L
= 600
-
2
3
Ring
Cycles
On Hook Ringing Current
-
-
30
mApk
Switch Hook Detection Threshold
SHD = V
OL
18
-
-
mA
SHD = V
OH
-
-
12
mA
Ground Key Detection Threshold
GKD = V
OL
20
-
-
mA
GKD = V
OH
-
-
10
mA
Loop Current During Power Denial
R
L
= 200
-
2
-
mA
Dial Pulse Distortion
0
-
5
ms
Receive Input Impedance
(Note 2)
-
110
-
k
Transmit Output Impedance
(Note 2)
-
10
20
Two Wire Return Loss
(Referenced to 600
+ 2.16
F), (Note 2)
SR
L
LO
-
15.5
-
dB
ER
L
-
24
-
dB
SR
L
HI
-
31
-
dB
Longitudinal Balance
1V
RMS
200Hz - 3400Hz, (Note 2) IEEE Method
2 Wire Off Hook
58
65
-
dB
2 Wire On Hook
60
63
-
dB
4 Wire Off Hook
0
o
C
T
A
+75
o
C
50
58
-
dB
8-21
Specifications HC-5504DLC
Low Frequency Longitudinal Balance
R.E.A. Method, (Note 2), R
L
= 600
0
o
C
T
A
+75
o
C
-
-
23
dBrnC
-
-
-67
dBm0p
Insertion Loss
at 1kHz, 0dBm Input Level, Referenced 600
2 Wire - 4 Wire, 4 Wire - 2 Wire
-
0.05
0.2
dB
Frequency Response
200 - 3400Hz Referenced to Absolute Loss at
1kHz and 0dBm Signal Level (Note 2)
-
0.02
0.05
dB
Idle Channel Noise
(Note 2)
2 Wire - 4 Wire, 4 Wire - 2 Wire
-
1
5
dBrnC
-
-89
-85
dBm0p
Absolute Delay
(Note 2)
2 Wire - 4 Wire, 4 Wire - 2 Wire
-
-
2
ms
Trans Hybrid Loss
Balance Network Set Up for 600
Termination at
1kHz
36
40
-
dB
Overload Level
V
B
+ = +5V
1.5
-
-
Vpeak
2 Wire - 4 Wire, 4 Wire - 2 Wire
V
B
+ = +12V
1.75
-
-
Vpeak
Level Linearity
At 1kHz, (Note 2) Referenced to 0dBm Level
2 Wire - 4 Wire, 4 Wire - 2 Wire
+3 to -40dBm
-
-
0.05
dB
-40 to -50dBm
-
-
0.1
dB
-50 to -55dBm
-
-
0.3
dB
Power Supply Rejection Ratio
(Note 2)
V
B
+ to 2 Wire
30 - 60Hz, R
L
= 600
15
-
-
dB
V
B
+ to Transmit
15
-
-
dB
V
B
- to 2 Wire
15
-
-
dB
V
B
- to Transmit
15
-
-
dB
V
B
+ to 2 Wire
200 - 16kHz R
L
= 600
30
-
-
dB
V
B
+ to Transmit
30
-
-
dB
V
B
- to 2 Wire
30
-
-
dB
V
B
- to Transmit
30
-
-
dB
Logic Input Current (RS, RC, PD)
0V
V
IN
+ 5V
-
-
100
A
Logic Inputs
Logic `0' V
IL
-
-
0.8
V
Logic `1' V
IH
2.0
-
5.5
V
Logic Outputs
Logic `0' V
OL
I
LOAD
800
A, V
B
+ = +12V, +5V
-
0.1
0.5
V
Logic `1' V
OH
I
LOAD
80
A, V
B
+ = +12V
2.7
5.0
5.5
V
I
LOAD
40
A, V
B
+ = +5V
2.7
-
5.0
V
* I
LONG
= Longitudinal Current
NOTES:
1. Absolute maximum ratings are limiting values, applied individually, beyond which the serviceability of the circuit may be impaired. Func-
tional operability under any of these conditions is not necessarily implied.
2. 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 spec-
ification compliance.
Electrical Specifications
Unless Otherwise Specified, V
B
- = -48V, V
B
+ = +12V and +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
8-22
Specifications HC-5504DLC
Uncommitted Op Amp Specifications
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Offset Voltage
-
5
-
mV
Input Offset Current
-
10
-
nA
Input Bias Current
-
20
-
nA
Differential Input Resistance
(Note 2)
-
1
-
M
Output Voltage Swing
R
L
= 10K, V
B
+ = +12V
-
5
-
V
PEAK
R
L
= 10K, V
B
+ = +5V
-
3
-
V
PEAK
Output Resistance
A
VCL
= 1 (Note 2)
-
10
-
Small Signal GBW
(Note 2)
-
1
-
MHz
Pin Descriptions
28 PIN
PLCC
24 PIN
DIP/SOIC
SYMBOL
DESCRIPTION
2
1
TIP
An analog input connected to the TIP (more positive) side of the subscriber loop through a 150
feed
resistor and a ring relay contact. Functions with the Ring terminal to receive voice signals from the
telephone and for loop monitoring purposes.
3
2
RING
An analog input connected to the RING (more negative) side of the subscriber loop through a 150
feed resistor and a ring relay contact. Functions with the Tip terminal to receive voice signals from the
telephone and for loop monitoring purposes.
4
3
RFS
Senses ring side of loop for ground key and ring trip detection. During ringing, the ring signal is insert-
ed into the line at this node and RF is isolated from RFS via a relay.
5
4
V
B
+
Positive Voltage Source - Most positive supply. V
B
+ is typically 12V or 5V.
6
5
C3
Capacitor #3 - An external capacitor to be connected between this terminal and analog ground.
Required for proper operation of the loop current limiting function, and for filtering V
B
-. Typical value
is 0.3
F, 30V.
7
6
DG
Digital Ground - To be connected to zero potential and serves as a reference for all digital inputs and
outputs on the SLIC microcircuit.
9
7
RS
Ring Synchronization Input - A TTL - compatible clock input. The clock should be arranged such that
a positive pulse transition occurs on the zero crossing of the ring voltage source, as it appears at the
RFS terminal. For Tip side injected systems, the RS pulse should occur on the negative going zero
crossing and for Ring injected systems, on the positive going zero crossing. This ensures that the ring
relay activates and deactivates when the instantaneous ring voltage is near zero. If synchronization
is not required, the pin should be tied to +5V.
10
8
RD
Relay Driver - A low active open collector logic output. When enabled, the external ring relay is
energized.
11
9
TF
Tip Feed - A low impedance analog output connected to the TIP terminal through a 150
feed resistor.
Functions with the RF terminal to provide loop current, feed voice signals to the telephone set, and
sink longitudinal current.
12
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 longitudinal current.
13
11
V
B
-
Negative Voltage Source - Most negative supply. V
B
- is typically -48V with an operational range of
-42V to -58V. Frequently referred to as "battery".
14
12
BG
Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows
into this ground terminal.
16
13
SHD
Switch Hook Detection - A low active LS TTL - compatible logic output.
17
14
GKD
Ground Key Detection - A low active LS TTL - compatible logic output. This output is enabled if the
DC current into the ring lead exceeds the DC current out of the tip lead by more than 20mA, and dis-
abled if this current difference is below an internally set threshold.
18
15
PD
Power Denial - A low active TTL - Compatible logic input. When enabled, the switch hook detect
(SHD) and ground key detect (GKD) are not necessarily valid, and the relay driver (RD) output is dis-
abled.
8-23
Specifications HC-5504DLC
Functional Diagram
19
16
RC
Ring Command - A low active TTL - Compatible logic input. When enabled, the relay driver (RD)
output goes low on the next high level of the ring sync (RS) input, as long as the SLIC is not in the
power denial state (PD = 0) or the subscriber is not already off- hook (SHD = 0).
20
17
C2
Capacitor #2 - An external capacitor to be connected between this terminal and digital ground.
Prevents false ground key indications from occurring during ring trip detection. Typical value is
0.15
F, 10V. This capacitor is not used if ground key function is not required and (Pin 17) may be left
open or connected to digital ground.
21
18
OUT
The analog output of the spare operational amplifier. The output voltage swing is typically
5V.
23
19
-IN
The inverting analog input of the spare operational amplifier.
24
20
+IN
The non-inverting analog input of the spare operational amplifier.
25
21
RX
Receive Input, Four Wire Side - 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.
26
22
C4
Capacitor #4 - An external capacitor to be connected between this terminal and analog ground. This
capacitor prevents false ground key indication and false ring trip detection from occurring when
longitudinal currents are induced onto the subscriber loop from near by power lines and other noise
sources. This capacitor is also required for the proper operation of ring trip detection. Typical value is
0.5
F, to 1.0
F, 20V. This capacitor should be nonpolarized.
27
23
AG
Analog Ground - To be connected to zero potential and serves as a reference for the transmit output
(TX) and receive input (RX) terminals.
28
24
TX
Transmit Output, Four Wire Side - A low impedance analog output which represents the differential
voltage across Tip and Ring. Transhybrid balancing must be performed (using the SLIC microcircuit's
spare op amp) beyond this output to completely implement two to four wire conversion. 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.
1,8,15,22
NC
No Internal Connection.
NOTE: All grounds (AG, BG, & DG) must be applied before V
B
+ or V
B
-. 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.
Pin Descriptions (Continued)
28 PIN
PLCC
24 PIN
DIP/SOIC
SYMBOL
DESCRIPTION
+
DIFF
AMP
+
OP
AMP
LOOP
MONITORING
RING
CONTROL
2 WIRE
LOOP
SECONDARY
PROTECTION
LINE
DRIVERS
TIP
RING
V
B
-
V
B
-
PD
POWER DENIAL
150
RING
150
RF
BG
150
TF
TIP
RD
RC
RS
RING SYNC
RING COMMAND
RING
TRIP
SHD
GKD
TX
TRANSMIT
OUTPUT
OUT
+IN
-IN
RX
RECEIVE
INPUT
SLIC MICROCIRCUIT
1/2 RING
RELAY
V
B
-
RING
VOLTAGE
RFS
1/2 RING
RELAY
150
SWITCH HOOK
DETECTION
GROUND KEY
DETECTION
-1
+1
BATTERY
FEED
LOOP
CURRENT
LIMITER
8-24
HC-5504DLC
Schematic
SLIC FUNCTIONAL SCHEMATIC
(DIP/SOIC PIN NUMBERS SHOWN)
V
B2
V
B1
V
B2
V
B3
V
B4
V
B5
+5V
I
B1
I
B2
I
B3
I
B4
I
B5
I
B6
I
B7
I
B8
V
BAT
I
B9
I
B10
I
B11
V
B
+
V
B
+
VOLTAGE & CURRENT
BIAS NETWORK
A-100
TRANSV'L
I/V AMP
-
+
I
B6
R6
R5
R11
V
B
+
R7
R8
R10
R9
R22
R23
R3
R4
R1
R2
R16
R15
V
BAT
V
BAT
R12
V
BAT
V
B
+
A-200
LONG'L
I/V AMP
I
B7
+
-
R20
V
V
B
+
A-400
TIP FEED
AMP
I
B4
-
+
RING
FEED
SENSE
V
BAT
V
BAT
+5V
V
B4
I
B8
RING TRIP DETECTOR
+
SWITCH HOOK
V
B1
I
B6
+
R
DETECTOR
18
V
B
+
Q
D28
Q
D27
V
BAT
-
+
-
GND SHORTS
CURRENT
LIMITING
I
B1
V
B3
THERMAL
LIMITING
V
B5
STTL
AND LOGIC
INTERFACE
RFC
SH
GK
V
B5
-
+
I
B2
LOAD CURRENT
LIMITING
R14
R13
V
BAT
V
BAT/2
REFERENCE
R21
V
BAT
A-300
RING FEED
AMP
I
B5
-
+
RING
RF
TIP
TF
10
2
3
1
9
RX
C4
V
BAT
BAT
ANA
DIG
V
B
+
GND
GND
GND
21
22
11
12
23
6
4
+
-
OUT
20
19
18
A-500
OP AMP
V
BAT
I
B3
V
B
+
V
B
+
+5V I
B10
V
BAT
PD
15
RC
SHD
GKD
C2
16
13
17
14
TX
C3
RS
RD
8
7
24
5
R17
V
B2
V
B
+
R
19
V
BAT
Q
D36
Q
D3
BAT
8-25
HC-5504DLC
LOGIC GATE SCHEMATIC
ontinued)
15
5
6
12
4
13
A
B
C
C
B
A
TTL
TO
STTL
TTL
TO
STTL
TTL
TO
STTL
TO
R21
GKD
SHD
RD
PD
RC
RS
C2
TTL
TO
STTL
TTL
TO
STTL
DELAY
LOGIC BIAS
RELAY
DRIVER
11
14
3
9
7
8
10
2
SCHOTTKY LOGIC
Die Characteristics
Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185
Diode Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Die Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 x 102
Substrate Potential . . . . . . . . . . . . . . . . . . . . . . . Connected
Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bipolar-DI
Thermal Constants (
o
C/W)
JA
JC
Ceramic DIP . . . . . . . . . . . . . . . . . . . .
52
15
Plastic DIP . . . . . . . . . . . . . . . . . . . . . .
52
22
PLCC . . . . . . . . . . . . . . . . . . . . . . . . . .
67
29
SOIC . . . . . . . . . . . . . . . . . . . . . . . . . .
76
24
Overvoltage Protection and Longitudinal
Current Protection
The SLIC device, in conjunction with an external protection
bridge, will withstand high voltage lightning surges and
power line crosses.
High voltage surge conditions are as specified in Table 1.
The SLIC will withstand longitudinal currents up to a maxi-
mum or 30mArms, 15mArms per leg, without any perfor-
mance degradation.
.
TABLE 1
PARAMETER
TEST
CONDITION
PERFORMANCE
(MAX)
UNITS
Longitudinal
Surge
10
s Rise/
1000 (Plastic)
V
PEAK
1000
s/Fall
500 (Ceramic)
V
PEAK
Metallic Surge
10
s Rise/
1000 (Plastic)
V
PEAK
1000
Fall
500 (Ceramic)
V
PEAK
T/GND
10
s Rise/
1000 (Plastic)
V
PEAK
R/GND
1000
s Fall
500 (Ceramic)
V
PEAK
50/60Hz Current
T/GND
11 Cycles
700 (Plastic)
V
RMS
R/GND
Limited to
10Arms
350 (Ceramic)
V
RMS
8-26
HC-5504DLC
Applications Diagram
FIGURE 1. TYPICAL LINE CIRCUIT APPLICATION WITH THE MONOLITHIC SLIC
Typical Component Values
C2 = 0.15
F, 10V
C3 = 0.3
F, 30V
C4 = 0.5
F to 1.0
F, 10%, 20V (Should be nonpolarized)
C5 = 0.5
F, 20V
C6 = C7 = 0.5
F (10% Match Required) (Note 2)
C8 = 0.01
F, 100V
C9 = 0.01
F, 20V,
20%
R1 = R2 = R3 = 100k (0.1% Match Required, 1% absolute
value) ZB = 0 for 600
Terminations (Note 2)
RB
1
= RB
2
= RB
3
= RB
4
= 150
(0.1% Match Required, 1%
absolute value)
R
S1
= R
S2
=1k
, typically.
C
S1
= C
S2
= 0.1
F, 200V typically, depending on V
RING
and
line length.
Z
1
= 150V to 200V transient protection.
PTC used as ring generator ballast.
NOTES:
1. Secondary protection diode bridge recommended is a 2A, 200V type.
2. To obtain the specified transhybrid loss it is necessary for the three legs of the balance network, C6-R1 and R2 and C7-ZB-R3, to match
in impedance to within 0.3%. Thus, if C6 and C7 are 1
F each, a 20% match is adequate. It should be noted that the transmit output to
C6 sees a -22V step when the loop is closed. Too large a value for C6 may produce an excessively long transient at the op amp output
to the PCM Filter/CODEC.
A 0.5
F and 100k
gives a time constant of 50msec. The uncommitted op amp output is internally clamped to stay within
5.5V and
also has current limiting protection.
3. All grounds (AG, BG, & DG) must be applied before V
B
+ or V
B
-. 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.
4. To prevent saturation of longitudinal amplifier during ringing, the ringer current should be limited to less than 30mA peak.
5. Application shows Ring injected ringing, a Balanced or Tip injected configuration may be used.
6. Pin numbers given for DIP/SOIC package.
Additional information is contained in Application Note 549, "The HC-550X Telephone SLICs'' By Geoff Phillips
RB4
K1B
K1A
RING
RING FEED
RING FEED SENSE
TIP
V
B
-
SLIC
HC-5504DLC
R
S1
RB2
RB1
PTC
Z
1
-48V
150V PEAK (MAX)
RING GENERATOR
RING
RB3
R
S2
C
S2
SUBSCRIBER
LOOP
-48V
SYSTEM CONTROLLER
K1
8
1
9
10
3
2
1
TIP FEED
TIP
RD
OP AMP
RX
TX
+IN
-IN
OUT
C2
C3
C4
NEG.
BATT.
BATT.
GND.
DIG.
GND.
ANA.
GND.
V
B
+
POWER
DENIAL
SWITCH
HOOK
DETECT
GROUND
KEY
DETECT
RING
SYNC
RING
CMD
15
13
14
7
16
11
12
6
23
C9
4
V
B
+
C8
C4 C3 C2
+
+
21
24
20
19
18
17
5
22
C6
R1
R2
C7
C5
R3
BALANCE NETWORK
PCM
FILTER/
CODEC
SWITCHING
NETWORK
ZB
+5V TO
+12V
PRIMARY
PROTEC-
TION
C
S1
8-27
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