Document ID# 080201
Date:
Jul 17, 2006
Rev:
G
Version: 1
Distribution:
Public Document
TM
Le79489
Subscriber Line Interface Circuit
Ve580 Series
DISTINCTIVE CHARACTERISTICS
Ideal for low power sensitive applications
Low standby power (normal and reverse)
Automatic on-chip battery switching
On-chip thermal management
On-chip thermal shutdown
20 V to 60 V battery operation
Programmable current limit
Programmable resistive feed
Programmable loop-detect threshold
Selectable overhead for metering applications
Two-wire impedance set by single external
impedance
On-chip ring and test relay drivers and relay
snubber circuits
Polarity reversal (full transmission)
Loop and ground-key detector
Comparator for ring-trip detection
Ground-start capability
On-hook transmission
BLOCK DIAGRAM
Two-Wire
Interface
Test Relay
Driver
Ring Relay
Driver
Input
Decoder
and
Control
Ring-Trip
Comparator
Ground-Key
Detector
Loop Detector
Signal
Transmission
Power-Feed
Controller
Switch Control
TESTOUT
RINGOUT
C1
C2
C3
C4
E1
DET
RD
VTX
RSN
RDC
CAS
OVH
RFA
AGND/DGND
VCC
BSWTH
BSWEN
BSWOUT
BGND
VBAT1
VBAT2
B(RING)
HPB
HPA
A(TIP)
DB
DA
TMG
2
Le79489 Ve580 Series Data Sheet
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.
Valid Combinations
Valid Combinations list configurations planned to
be supported in volume for this device. Contact
Legerity sales to confirm availability of specific
valid combinations and to obtain additional data
on Legerity's standard militarygrade products.
*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.
Valid Combinations
Le79489*
(Blank)
2
3
DJC
Le79489*
C
C = Commercial (0
C to 70C)*
PACKAGE TYPE
J = 32-pin Plastic Leaded Chip Carrier (PL 032)
DEVICE NUMBER/DESCRIPTION
Le79489
Subscriber Line Interface Circuit
PERFORMANCE GRADE OPTION
Blank = No performance grade option
2 = 60 dB Longitudinal Balance, Polarity Reversal
3 = 52 dB Longitudinal Balance, No Polarity Reversal
TEMPERATURE RANGE
D
J
PACKAGING
D = Green package
Le79489 Ve580 Series Data Sheet
3
CONNECTION DIAGRAMS
Top View
RD
HPB
NC
RSN
RSVD
TMG
TESTOUT
VBAT1
BSWEN
C1
DET
E1
1
2
3
4
32 31 30
5
6
7
8
9
10
11
12
13
14 15 16 17 18 19 20
21
22
23
24
25
26
27
28
29
DA
BSWOUT
VTX
AGND/DGND
HPA
C4
C3
C2
BSWTH
CAS
OVH
RF
A
RDC
RI
N
G
O
U
T
VBAT2
VCC
BGND
B(RING)
A(TIP)
DB
32-Pin PLCC
Notes:
1. Pin 1 is marked for orientation.
2. NC = No Connect
3. RSVD = Reserved. Do not connect to this pin.
4
Le79489 Ve580 Series Data Sheet
PIN DESCRIPTIONS
Pin Names
Type
Description
AGND/DGND
Gnd
Analog and Digital ground.
A(TIP)
Output
Output of A(TIP) power amplifier.
BGND
Gnd
Battery (power) ground.
B(RING)
Output
Output of B(RING) power amplifier.
BSWEN
--
Battery Switch Control. Internally connected to automatic battery switch circuitry. BSWEN can
be overridden by external logic. BSWEN Low connects VBAT1 to VBAT2. BSWEN High
disconnects VBAT1 from VBAT2.
BSWOUT
Output
Buffered Output. Internally connected to battery switch circuitry. The output is open-collector
with a built-in pull-up resistor. BSWOUT Low indicates VBAT1 is connected to VBAT2.
BSWOUT High indicates VBAT1 is disconnected from VBAT2. This output is valid only in the
Active states.
BSWTH
Input
Input for setting automatic battery switch threshold. Normally tied to Battery 2. Tie to ground
for manual switching.
C3C1
Input
Decoder. TTL compatible. C3 is MSB and C1 is LSB.
C4
Input
Test Relay Input Active Low. 1 = Off. 0 = On.
CAS
Capacitor
Anti-sat pin for capacitor to filter reference voltage when operating in anti-sat region.
DA
Input
Ring-trip negative. Negative input to ring-trip comparator.
DB
Input
Ring-trip positive. Positive input to ring-trip comparator.
DET
Output
Switchhook detector. When enabled, a logic Low indicates the selected detector is tripped. The
detector is selected by the logic inputs (C3C1). The output is open-collector with a built-in 15
k
pull-up resistor.
E1
Input
Ground-Key Detect Select. E1 = 1 selects the hook switch detector. E1 = 0 selects the ground-
key detector. In the Tip Open state, ground key is selected independent of E1.
HPA
Capacitor
High-Pass Filter Capacitor. A(TIP) side of high-pass filter capacitor.
HPB
Capacitor
High-Pass Filter Capacitor. B(RING) side of high-pass filter capacitor.
NC
--
No connect. This pin not internally connected.
OVH
Input
Overhead Control. Logic High enables minimized nonmetering overhead. Logic Low enables
2.2 V metering DC overhead. TTL-compatible.
RD
Resistor
Detector resistor. Detector threshold set and filter pin.
RDC
Resistor
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). Connection point for the DC
feed current programming network. The other end of the network connects to RSN. V
RDC
is
negative for normal polarity and positive for reverse polarity.
RFA
--
Resistive feed adjust. Adjust the DC feed resistance gain coefficient, GDC, with external
resistor connected to ground.
RINGOUT
Output
Ring Relay Driver. Open-collector driver with emitter internally connected to BGND.
RSN
Input
Receive Summing Node. The metallic current (AC and DC) between A(TIP) and B(RING) is
equal to 500 times the current into this pin. The networks that program receive gain, two-wire
impedance, and feed current all connect to this node.
RSVD
--
Reserved. These pins are reserved for Legerity use. Make no connection to these pins.
TESTOUT
Output
Test Relay Driver. Open collector driver with emitter internally connected to AGND.
TMG
--
Thermal Management. External resistor connects this pin to VBAT2 to offload power dissipa-
tion from SLIC. Functions during normal polarity, Active state.
VBAT1
Battery
Most negative battery supply and substrate connection.
VBAT2
Battery
Battery supply for output power amplifiers. Switched to VBAT1 by BSWEN.
VCC
Power
+5 V power supply.
VTX
Output
Transmit Audio. This output is a 0.5066 unity gain version of the A(TIP) and B(RING) metallic
voltage. VTX also sources the two-wire input impedance programming network.
Exposed Pad
Battery
This must be electrically tied to VBAT1.
Le79489 Ve580 Series Data Sheet
5
ABSOLUTE MAXIMUM RATINGS
Storage temperature . . . . . . . . . . . . 55C to +150C
With respect to AGND/DGND:
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . .0.4 V to +7.0 V
V
BAT1
Continuous . . . . . . . . . . . . . . . . . . +0.4 V to 70 V
10 ms . . . . . . . . . . . . . . . . . . . . . . +0.4 V to 75 V
V
BAT2
and BSWTH. . . . . . . . . . . . . . . +0.4 V to V
BAT1
BGND. . . . . . . . . . . . . . . . . . . . . . . . . . . .+3 V to 3 V
A(TIP) or B(RING) with respect to BGND:
Continuous . . . . . . . . . . . . . . . . . . . .V
BAT1
to +1 V
10 ms (f = 0.1 Hz) . . . . . . . . . . . . . . .70 V to +5 V
1 s (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
TESTOUT/RINGOUT/current. . . . . . . . . . . . . . 80 mA
TESTOUT/RINGOUT/voltage . . . . . . . BGND to +7 V
TESTOUT/RINGOUT/transient . . . . . BGND to +10 V
DA and DB inputs
Voltage on ring-trip inputs . . . . . . . . . . V
BAT1
to 0 V
Current on ring-trip inputs . . . . . . . . . . . . . 10 mA
C4C1, BSWEN, OVH, E1
Input voltage . . . . . . . . . . . . 0.4 V to V
CC
+ 0.4 V
Maximum power dissipation, continuous*
T
A
= 70C, No heat sink (see note):
In 32-pin PLCC package. . . . . . . . . . . . . . . . 1.7 W
Thermal data (
JA
)
In 32-pin PLCC package....................... 43C/W typ
ESD immunity (HBM) . . . JESD22 Class 1C compliant
* Thermal limiting circuitry on chip will shut down the circuit at
a junction temperature of about 165C. Continuous operation
above 145C junction temperature may degrade device reli-
ability.
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 affect device reliability.
Package Assembly
Green package devices are assembled with enhanced,
environmental compatible lead-free, halogen-free, and
antimony-free materials. The leads possess a matte-tin
plating which is compatible with conventional board assembly
processes or newer lead-free board assembly processes.
The peak soldering temperature should not exceed 245C
during printed circuit board
OPERATING RANGES
Commercial (C) Devices
Ambient temperature . . . . . . . . . . . . 40C to +85C*
V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . 4.75 V to 5.25 V
BAT1 . . . . . . . . . . . . . . . . . . . . . . . . . 40.5 V to 60 V
BAT2 . . . . . . . . . . . . . . . . . . . . . . . . . . .20 V to BAT1
AGND/DGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V
BGND with respect to GND . . . 100 mV to +100 mV
Load resistance on VTX to GND. . . . . . . . . 20 k
min
Operating ranges define those limits over which the
functionality of the device is guaranteed by production
testing.
* Legerity guarantees the performance of this device over
commercial (0 to 70C) 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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