Le79484
Subscriber Line Interface Circuit
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
DISTINCTIVE CHARACTERISTICS
■
Ideal for long-loop applications
■
Low standby power (45 mW)
■
–40 V to –58 V battery operation
■
On-hook transmission
■
Tip Open state for ground-start lines
■
Two-wire impedance set by single external
impedance
■
Programmable constant-current feed
■
Programmable loop-detect threshold
■
Current gain = 200
BLOCK DIAGRAM
TMG
DA
DB
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Ring-Trip
Detector
Two-Wire
Interface
Ground-Key
Detector
Off-hook
Detector
Power-Feed
Controller
A(TIP)
HPA
HPB
B(RING)
Signal
Transmission
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VBAT
BGND
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Relay
Driver
Ring Relay
Driver
Input Decoder
and Control
■
Polarity reversal option available
■
On-chip Thermal Management (TMG) feature
■
On-chip ring and test relay driver and relay
snubber circuits
TESTOUT
RINGOUT
C1
C2
C3
C4
E1
E0
DET
RD
VTX
RSN
RDC
CAS
VCC VNEG AGND/DGND
Document ID#
080180
Date:
Jun 18, 2002
Rev:
D
Version:
1
Distribution:
Public Document
ORDERING INFORMATION
Standard Products
Legerity standard products are available in several packages and operating ranges. The order number (Valid Combination) is
formed by a combination of the elements below.
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
Le79484*
–1
J
C
TEMPERATURE RANGE
C = Commercial (0°C to 70°C)*
PERFORMANCE GRADE OPTION
–1 = 52 dB Longitudinal Balance, Polarity Reversal
–2 = 63 dB Longitudinal Balance, Polarity Reversal
–3 = 52 dB Longitudinal Balance, No Polarity Reversal
–4 = 63 dB Longitudinal Balance, No Polarity Reversal
DEVICE NUMBER/DESCRIPTION
Le79484
Subscriber Line Interface Circuit
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–1
–2
–3
–4
JC
Valid Combinations
Le79484*
*Legerity reserves the right to fulfill all orders for this device with parts marked with the "Am" part number prefix, until
such time as all inventory bearing this mark has been depleted. It should be noted that parts marked with either the "Am"
or the "Le" part number prefix are equivalent devices in terms of form, fit, and function. The only difference between the
two is in the part number prefix appearing on the topside mark.
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Le79484 Data Sheet
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Valid Combinations
PACKAGE TYPE
J = 32-pin Plastic Leaded Chip Carrier (PL 032)
Valid Combinations list configurations planned to
be supported in volume for this device. Consult
the local Legerity sales office to confirm
availability of specific valid combinations, to
check on newly released combinations, and to
obtain additional data on Legerity’s standard
military grade products.
CONNECTION DIAGRAM
Top View
BGND
B(RING)
A(TIP)
VCC
NC
NC
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
4
NC
RINGOUT
TESTOUT
TMG
VBAT
C3
E1
C4
NC
5
6
7
8
9
10
11
12
13
3
2
1
32 31 30
29
28
27
26
NC
DA
RD
HPB
DB
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
32-Pin PLCC
14 15 16 17
E0
C2
C1
DET
Notes:
1. Pin 1 is marked for orientation.
2. NC = No Connect
3. RSVD = Reserved. Do not connect to this pin.
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Le79484 Data Sheet
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25
24
23
22
21
RSVD
HPA
VTX
VEE
RSN
18 19 20
RDC
AGND/DGND
CAS
3
PIN DESCRIPTIONS
Pin Names
AGND/DGND
A(TIP)
BGND
B(RING)
Type
Ground
Output
Ground
Output
Input
Capacitor
Input
Input
Output
Input
Input
Capacitor
Capacitor
—
Resistor
Resistor
Description
Analog and digital ground are connected internally to a single pin.
Output of A(TIP) power amplifier.
Battery (power) ground.
Output of B(RING) power amplifier.
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
C4–C1
CAS
DA
DB
DET
E0
E1
HPA
HPB
NC
RD
RDC
Decoder. SLIC control pins. TTL compatible. C4 is MSB and C1 is LSB.
Anti-saturation. Pin for capacitor to filter reference voltage when operating in anti-
saturation region.
Ring-trip negative. Negative input to ring-trip comparator.
Ring-trip positive. Positive input to ring-trip comparator.
Switchhook detector. Logic Low indicates that the selected detector is tripped. C3–C1
and E0 select the detector. Open-collector with a built-in 15 kΩ pull-up resistor.
Detect enable. A logic High enables DET. A logic Low disables DET.
Ground-key enable. E1 Low connects the ground-key or ring-trip detector to DET. E1
High connects the off-hook detector or ring-trip detector to DET.
High-pass filter. A(TIP) side of high-pass filter capacitor.
High-pass filter. B(RING) side of high-pass filter capacitor.
No connect. Pin not internally connected.
RINGOUT
RSN
Output
Input
RSVD
TESTOUT
TMG
—
Output
—
VBAT
VCC
VEE
VTX
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Battery
Power
Power
Output
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+5 V power supply.
–5 V power supply.
Detect resistor. Threshold modification/filter point for the off-hook detector.
DC feed resistor. Connection point for the DC feed current programming network. The
other end of the network connects to the receiver summing node (RSN). VRDC is
negative for normal polarity and positive for reverse polarity.
Ring relay driver. Open collector Darlington pull down.
Receive Summing Node. The metallic current (both AC and DC) between A(TIP) and
B(RING) is 200 times the current flowing into this pin. The networks that program
receive gain, two-wire impedance, and feed resistance connect to this node.
This pin is reserved only for test purposes. Leave unconnected.
Test relay driver. Open collector Darlington pull down.
Thermal management. External resistor connects between this pin and VBAT to off-load
power dissipation from SLIC. Functions during Normal Polarity and Reverse Polarity
states.
Battery supply. Connected through an external protection diode.
Transmit Audio. This output is a unity gain version of the A(TIP) and B(RING) metallic
voltage. VTX also sources the two-wire input impedance programming network.
Le79484 Data Sheet
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ABSOLUTE MAXIMUM RATINGS
Storage temperature . . . . . . . . . . . . –55°C to +150°C
V
CC
with respect to AGND/DGND . . . . –0.4 V to +7 V
V
EE
with respect to AGND/DGND . . . . +0.4 V to –7 V
V
BAT
with respect to AGND/DGND:
Continuous . . . . . . . . . . . . . . . . . . . +0.4 V to –70 V
10 ms . . . . . . . . . . . . . . . . . . . . . . . +0.4 V to –75 V
OPERATING RANGES
Commercial (C) Devices
Ambient temperature . . . . . . . . . . . . . . 0°C to +70°C*
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . 4.75 V to 5.25 V
V
EE
. . . . . . . . . . . . . . . . . . . . . . . . –4.75 V to –5.25 V
V
BAT
. . . . . . . . . . . . . . . . . . . . . . . . . . –40 V to –58 V
AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V
BGND with respect to
AGND/DGND. . . . . . . . . . . . –100 mV to +100 mV
Load resistance on VTX to ground . . . . . . . 10 kΩ min
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
NOT RECOMMENDED FOR NEW DESIGNS NOT RECOMMENDED FOR NEW DESIGNS
BGND with respect to AGND/DGND . . . . +3 V to –3 V
A(TIP) or B(RING) to BGND:
Continuous . . . . . . . . . . . . . . . . . . . . –70 V to +1 V
10 ms (f = 0.1 Hz) . . . . . . . . . . . . . . . –70 V to +5 V
1 µs (f = 0.1 Hz) . . . . . . . . . . . . . . . . . –80 V to +8 V
250 ns (f = 0.1 Hz) . . . . . . . . . . . . . .–90 V to +12 V
Current from A(TIP) or B(RING). . . . . . . . . . ±150 mA
RINGOUT/TESTOUT current. . . . . . . . . . . . . . 75 mA
RINGOUT/TESTOUT voltage . . . . . . . BGND to +7 V
RINGOUT/TESTOUT transient . . . . . BGND to +10 V
DA and DB inputs
Voltage on ring-trip inputs . . . . . . . . . . .V
BAT
to 0 V
Current into ring-trip inputs. . . . . . . . . . . . . ±10 mA
C4–C1, E0, E1
Input voltage. . . . . . . . . . . . . –0.4 V to V
CC
+ 0.4 V
Maximum power dissipation, continuous,
T
A
= 70°C, No heat sink (See note):
In 32-pin PLCC package . . . . . . . . . . . . . . . . 1.7 W
Thermal Data:
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .θ
JA
In 32-pin PLCC package . . . . . . . . . . . .43°C/W typ
Note:
Thermal limiting circuitry on chip will shut down the
circuit at a junction temperature of about 165°C. The device
should never see this temperature, and operation above
145°C junction temperature may degrade device reliability.
See the SLIC Packaging Considerations for more informa-
tion.
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Stresses above those listed under Absolute Maximum
Ratings may cause permanent device failure. Functionality
at or above these limits is not implied. Exposure to
Absolute Maximum Ratings for extended periods may
effect device reliability.
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Le79484 Data Sheet
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The operating ranges define those limits between which the
functionality of the device is guaranteed.
* Legerity guarantees the performance of this device over
commercial (0 to 70°C) and industrial (-40 to 85
°C)
temperature ranges by conducting electrical characterization
over each range and by conducting a production test with
single insertion coupled to periodic sampling. These
characterization and test procedures comply with section
4.6.2 of Bellcore TR-TSY-000357 Component Reliability
Assurance Requirements for Telecommunications
Equipment.
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