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.
θ
JA
is measured with the component mounted on an evaluation PC board in free air.
Electrical Specifications
Typical Parameters are at T
A
= 25
o
C, V
B
+ = 5V, V
B
- = -24V, AG = DG = BG = 0V. Min-Max Parameters are
Over Operating Positive and Negative Battery Voltages and Over the Operating Temperature Range. All
Parameters are Specified at 600W 2-Wire Terminating Impedance, Unless Otherwise Specified
PARAMETER
AC TRANSMISSION PARAMETERS
RX Input Impedance
TX Output Impedance
4-Wire Input Overload Level
2-Wire Return Loss
SRL LO
ERL
SRL HI
2-Wire Longitudinal to Metallic Balance Off Hook
4-Wire Longitudinal Balance Off Hook
Low Frequency Longitudinal Balance
Per ANSI/IEEE STD 455-1976,
300Hz to 3400Hz, (Note 3)
Per ANSI/IEEE STD 455-1976,
300Hz to 3400Hz, (Note 3)
R.E.A. Test Circuit
I
LINE
= 40mA, T
A
= 25
o
C (Note 3)
Longitudinal Current Capability
Insertion Loss
2-Wire/4-Wire
4-Wire/2-Wire
4-Wire/4-Wire
Frequency Response
Level Linearity
2-Wire to 4-Wire and 4-Wire to 2-Wire
-1.58dBm at 1kHz, Referenced 600Ω
0dBm at 1kHz, Referenced 600Ω
-1.58dBm at 1kHz, Referenced 600Ω
300Hz to 3400Hz, Referenced to Absolute Level at
1kHz, 0dBm Referenced 600Ω (Note 3)
Referenced to -10dBm, (Note 3)
+3 to -40dBm
-40 to -50dBm
-50 to -55dBm
-
-
-
-
-
-
±0.08
±0.12
±0.3
dB
dB
dB
-
-
-
-
±0.05
±0.05
-
±0.02
±0.2
±0.2
±0.2
±0.06
dB
dB
dB
dB
I
LINE
= 40mA, T
A
= 25
o
C (Note 3)
300Hz to 3.4kHz, 600Ω Reference
Matched for 600Ω, (Note 3)
26
30
30
58
50
-
-
-
35
40
40
63
55
-80
10
-
-
-
-
-
-
-67
23
40
dB
dB
dB
dB
dB
dBmp
dBrnC
mA
RMS
300Hz to 3.4kHz, (Note 3)
-
-
+1.0
100
-
-
-
20
-
kΩ
Ω
V
PEAK
TEST CONDITIONS
MIN
TYP
MAX
UNITS
2
HC-5524
Electrical Specifications
Typical Parameters are at T
A
= 25
o
C, V
B
+ = 5V, V
B
- = -24V, AG = DG = BG = 0V. Min-Max Parameters are
Over Operating Positive and Negative Battery Voltages and Over the Operating Temperature Range. All
Parameters are Specified at 600W 2-Wire Terminating Impedance, Unless Otherwise Specified
(Continued)
PARAMETER
Absolute Delay
2-Wire/4-Wire
4-Wire/2-Wire
4-Wire/4-Wire
Total Harmonic Distortion
2-Wire/4-Wire, 4-Wire/2-Wire, 4-Wire/4-Wire
Idle Channel Noise
2-Wire and 4-Wire
(Note 2)
300Hz to 3400Hz
300Hz to 3400Hz
300Hz to 3400Hz
Reference Level 0dBm at 600Ω,
300Hz to 3400Hz (Note 3)
C-Message, (Note 3)
Psophometric
3kHz Flat
Open Loop Voltage (V
TIP
- V
RING
)
Power Supply Rejection Ratio
V
B
+ to 2-Wire
V
B
+ to 4-Wire
V
B
- to 2-Wire
V
B
- to 4-Wire
V
B
+ to 2-Wire
V
B
+ to 4-Wire
V
B
- to 2-Wire
V
B
- to 4-Wire
Ring Sync Pulse Width
DC PARAMETERS
Loop Current Programming
Limit Range
Accuracy
Loop Current During Power Denial
Fault Currents
TIP to Ground
RING to Ground
TIP and RING to Ground
Switch Hook Detection Threshold
Ground Key Detection Threshold
Thermal ALM Output
Ring Trip Detection Threshold
Ring Trip Detection Period
Dial Pulse Distortion
Relay Driver Outputs
On Voltage V
OL
Off Leakage Current
TTL/CMOS Logic Inputs (F0, F1, RS, TST, PRI)
Logic ‘0’ V
IL
Logic ‘1’ V
IH
Input Current (F0, F1, RS, TST, PRI)
Logic Outputs
Logic ‘0’ V
OL
Logic ‘1’ V
OH
I
LOAD
= 800µA
I
LOAD
= 40µA
-
2.7
0.1
-
0.5
-
V
V
0V
≤
V
IN
≤
5V
-
2.0
-
-
-
-
0.8
5.5
±100
V
V
µA
I
OL
(PR) = 60mA, I
OL
(RD) = 30mA
V
OH
= 13.2V
-
-
0.2
±10
0.5
±100
V
µA
Safe Operating Die Temperature Exceeded
V
RING
= 105V
RMS
, f
RING
= 20Hz
-
-
-
-
-
140
-
-
-
30
120
150
12
10
-
10
100
0.1
-
-
-
15
-
160
-
150
0.5
mA
mA
mA
mA
mA
o
C
TEST CONDITIONS
MIN
-
-
-
-
TYP
-
-
0.95
-
MAX
1
1
1.5
-50
UNITS
µs
µs
µs
dB
-
-
-
-
20
20
20
20
-
-
-
15.8
40
40
40
50
40
28
50
50
-
5
-85
16
-
-
-
-
-
-
-
-
-
500
dBrnC
dBmp
dBrn
V
dB
dB
dB
dB
dB
dB
dB
dB
µs
V
B
+ = 5V, V
B
- = -24V
30Hz to 200Hz, R
L
= 600Ω, (Note 3)
200Hz to 16kHz, R
L
= 600Ω
30
20
20
20
50
20
10
R
L
= 200Ω
-
-
-
±4
60
-
±7
mA
%
mA
mA
ms
ms
3
HC-5524
Electrical Specifications
Typical Parameters are at T
A
= 25
o
C, V
B
+ = 5V, V
B
- = -24V, AG = DG = BG = 0V. Min-Max Parameters are
Over Operating Positive and Negative Battery Voltages and Over the Operating Temperature Range. All
Parameters are Specified at 600W 2-Wire Terminating Impedance, Unless Otherwise Specified
(Continued)
PARAMETER
Power Dissipation On Hook
I
B
+
I
B
-
I
B
+
I
B
-
UNCOMMITTED OP AMP PARAMETERS
Input Offset Voltage
Input Offset Current
Differential Input Resistance
Output Voltage Swing
Small Signal GBW
NOTE:
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.
(Note 3)
R
L
= 10kΩ
(Note 3)
-
-
-
-
-
±5
±10
1
±3
1
-
-
-
-
-
mV
nA
MΩ
V
P-P
MHz
TEST CONDITIONS
Relay Drivers Off
V
B
+ = 5.25V, V
B
- = -28V, R
LOOP
=
∞
V
B
+ = 5.25V, V
B
- = -28V, R
LOOP
=
∞
V
B
+ = 5V, V
B
- = -24V, R
LOOP
= 600Ω
V
B
+ = 5V, V
B
- = -24V, R
LOOP
= 600Ω
MIN
-
-
-4
-
-28
TYP
60
-
-
3
-24
MAX
-
4
-
6
-
UNITS
mW
mA
mA
mA
mA
Pin Descriptions
SOIC
1
2
3
4
PLCC
2
3
4
8
SYMBOL
AG
(Note 4)
V
B
+
C
1
F1
DESCRIPTION
Analog Ground - To be connected to zero potential. Serves as a reference for the transmit output and receive
input terminals.
Positive Voltage Source - Most Positive Supply.
Capacitor #C
1
- An external capacitor to be connected between this terminal and analog ground. Required for
proper operation of the loop current limiting function.
Function Address #1 - A TTL and CMOS compatible input used with F0 function address line to externally se-
lect logic functions. The three selectable functions are mutually exclusive. See Truth Table on front page. F1
should be toggled high after power is applied.
Function Address #0 - A TTL and CMOS compatible input used with F1 function address line to externally se-
lect logic functions. The three selectable functions are mutually exclusive. See Truth Table on front page.
Ring Synchronization Input - A TTL - compatible clock input. The clock is arranged such that a positive pulse
(50µs - 500µs) 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 delay activates and deactivates when
the instantaneous ring voltage is near zero. If synchronization is not required, the pin should be tied to +5V.
Switch Hook Detection - An active low LS TTL compatible logic output. A line supervisory output.
Ground Key Detection - An active low LS TTL compatible logic output. A line supervisory output.
A TTL logic input. A low on this pin will set a latch and keep the SLIC in a power down mode until the proper
F1, F0 state is set and will keep ALM low. See Truth Table on front page.
A LS TTL compatible active low output which responds to the thermal detector circuit when a safe operating
die temperature has been exceeded. When TST is forced low by an external control signal, ALM is latched low
until the proper F1, F0 state and TST input is brought high. The ALM can be tied directly to the TST pin to
power down the part when a thermal fault is detected and then reset with F0, F1. See Truth Table on front page.
It is possible to ignore transient thermal overload conditions in the SLIC by delaying the response to the TST
pin from the ALM. Care must be exercised in attempting this as continued thermal overstress may reduce com-
ponent life.
Loop Current Limit - Voltage on this pin sets the short loop current limiting conditions using a resistive voltage
divider.
The analog output of the spare operational amplifier.
The inverting analog input of the spare operational amplifier.
5
6
9
10
F0
RS
7
8
9
10
11
12
13
17
SHD
GKD
TST
ALM
11
12
13
18
19
20
I
LIMIT
OUT1
-IN1
4
HC-5524
Pin Descriptions
SOIC
14
PLCC
22
(Continued)
DESCRIPTION
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.
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.
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.
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.
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.
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.
A TTL compatible input used to control PR. PRI active High = PR active low.
An active low open collector output. Can be used to drive a Polarity Reversal Relay.
Digital Ground - To be connected to zero potential. Serves as a reference for all digital inputs and outputs on
the SLIC.
Ring Relay Driver - An active low open collector output. Used to drive a relay that switches ringing signals onto
the 2-Wire line.
Feedback input to the tip feed amplifier; may be used in conjunction with transmit output signal and the spare
op-amp to accommodate 2-Wire line impedance matching. (This is not used in the typical applications circuit).
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 TF
1
.
Tie directly to TF
2
in the PLCC application.
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.
Tie directly to RF
1
in the PLCC application.
The battery voltage source. The most negative supply.
Battery Ground - To be connected to zero potential. All loop current and some quiescent current flows into this
ground terminal.
No internal connection.
SYMBOL
TIP
15
16
24
25
RING
RFS
17
18
27
31
V
RX
C
2
19
32
V
TX
20
21
22
23
24
25
33
34
35
36
37
38
PRI
PR
DG
(Note 4)
RD
V
FB
(Note 5)
TF
2
NA
26
39
41
TF
1
RF
1
NA
27
28
42
43
44
1, 5, 6, 7,
14, 15,
16, 21,
23, 26,
28, 29,
30, 40
RF
2
V
B
-
BG
(Note 4)
NC
NOTES:
4. All grounds (AG, BG, and 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.
5. Although not used in the typical applications circuit, V
FB
may be used in matching complex 2-Wire impedances.
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