™
Le75181
A
Voice Solution
DESCRIPTION
The VoiceEdge™ family VE750 series of Line Card Access
Switches (LCAS) is a family of monolithic solid-state switches
that is designed to provide both power ringing access and test
access on the analog line card. These devices, while not a pin-
for-pin replacement for the traditional electromechanical relay
(EMR) solution, provide the equivalent switching functionality.
The VE750 series LCAS is meant as a solid-state alternative to
the EMRs.
The Le75181A/B device is pin-for-pin compatible with
Legerity’s L7581A/B device, and the Le75181C device is pin-
for-pin compatible with Legerity’s L8581A device.
Legerity also offers a range of compatible SLIC devices and
codec/filters that can be used with the VE750 series LCAS for
complete line card solutions that can be used worldwide in
analog line card applications.
Central office
DLC
PBX
DAML
HFC/FITL
Ringing Access Switch
VE750 Series
APPLICATIONS
FEATURES
Small size/surface-mount packaging
Monolithic IC reliability
Low impulse noise
Make-before-break, break-before-make operation
Clean, bounce-free switching
Low, matched ON-resistance
Built-in current limiting, thermal shutdown, and SLIC
protection
5 V only operation, very low power consumption
Battery monitor, all OFF state upon loss of battery
No EMI
Latched logic level inputs, no drive circuitry
Only one external protector required
TTL logic control compatible
Default power up state
BLOCK DIAGRAM
Le75181A/C
FGND
SCR
& Trip
Circuit
VBAT
TBAT
RBAT
TLINE
SW1
SW2
RLINE
TRINGING
RRINGING
SW3
SW4
LATCH
RELATED LITERATURE
081123 Le75282 Dual Intelligent Line Card Access
Switch Data Sheet
081126 Le75183 Line Card Access Switch Data Sheet
080754 Le58QL061/063 QLSLAC Data Sheet
080676 Le5711 Dual SLIC Data Sheet
081047 Le5712 Dual SLIC Data Sheet
FGND
VDD
INPUT
Temperature
Shutdown
TSD
DGND
Le75181B
VBAT
ORDERING INFORMATION
Device
LE75181ABSC
LE75181BBSC
LE75181CBSC
1.
The green package meets RoHS Directive 2002/95/EC of the
European Council to minimize the environmental impact of
electrical equipment.
For delivery using a tape and reel packing system, add a "T" suffix
to the OPN (Ordering Part Number) when placing an order.
16-Pin SOIC, GULL (Green)
Tube
Package Type
1
Packing
2
TBAT
RBAT
TLINE
SW3
SW1
SW2
RLINE
SW4
TRINGING
RRINGING
LATCH
VDD
INPUT
Temperature Shutdown
2.
TSD
DGND
NOTE: On August 3, 2007, Zarlink Semiconductor acquired the products and
technology of Legerity Holdings.
Document ID#
081105 Date:
Sep 18, 2007
Rev:
E
Version: 2
Distribution:
Public Document
Le75181
TABLE OF CONTENTS
Data Sheet
Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Related literature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Connection Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Operating Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Environmental Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Electrical Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Summary of Assumptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Supply Currents and Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Device Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Zero Cross Current Turn Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Switching Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Loss of Battery Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Impulse Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
Protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Integrated SLIC Device Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Physical Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
16-Pin, Plastic SOIC (GULL) (ASC/BSC/CSC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Revision A1 to B1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Revision B1 to C1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Revision C1 to D1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Revision D1 to E1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Revision E1 to E2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
2
Zarlink Semiconductor Inc.
Le75181
PRODUCT DESCRIPTION
Data Sheet
The Le75181 Ringing Access Switch is a monolithic solid-state device that provides the switching functionality of a two-form C
switch.
The Le75181 is designed to provide power ringing access to tip and ring in central office, digital loop carrier, private branch
exchange, digitally added main line, and hybrid fiber coax/fiber-in-the-loop analog line card applications. The Le75181 has three
states: the idle talk state (line break switches closed, ringing access switches open), power ringing state (line break switches
open, ringing access switches closed), and all OFF state.
The Le75181 offers break-before-make or make-before-break switching, with simple logic level input control. Because of the
solid-state construction, voltage transients generated when switching into an inductive ringing load during ring cadence or ring
trip are minimized, possibly eliminating the need for external zero cross switching circuitry. State control is via logic level inputs,
so no additional driver circuitry is required.
The line break switch is a linear switch that has exceptionally low ON-resistance and an excellent ON-resistance matching
characteristic. The ringing access switch has a breakdown voltage rating >480 V which is sufficiently high, with proper protection,
to prevent breakdown in the presence of a transient fault condition (i.e., passing the transient on to the ringing generator).
Incorporated into the Le75181A and Le75181C is a diode bridge/SCR clamping circuit, current-limiting circuitry, and a thermal
shutdown mechanism to provide protection to the SLIC device and subsequent circuitry during fault conditions (see block
diagram). Positive and negative lightning is reduced by the current-limiting circuitry and steered to ground via diodes and the
integrated SCR. Power cross is also reduced by the current-limiting and thermal shutdown circuits.
The Le75181B version provides only an integrated diode bridge along with current limiting and thermal shutdown, as shown in
the block diagram. This will cause positive faults to be directed to ground and negative faults to battery. In either polarity, faults
are reduced by the current-limit and/or thermal shutdown mechanisms.
The default power up state is in Idle/Talk state unless otherwise being overwritten by external controls.
To protect the Le75181 from an overvoltage fault condition, use of a secondary protector is required. The secondary protector
must limit the voltage seen at the tip/ring terminals to prevent the breakdown voltage of the switches from being exceeded. To
minimize stress on the solid-state contacts, use of a foldback- or crowbar- type secondary protector is recommended. With proper
choice of secondary protection, a line card using the Le75181 will meet all relevant ITU-T, LSSGR, FCC, or UL* protection
requirements.
The Le75181 operates off of a 5-V supply only. This gives the device extremely low idle and active power dissipation and allows
use with virtually any range of battery voltage. This makes the Le75181 especially appropriate for remote power applications
such as DAML or FOC/FITL or other Bellcore TA 909 applications where power dissipation is particularly critical.
A battery voltage is also used by the Le75181, only as a reference for the integrated protection circuit. The Le75181 will enter an
all OFF state upon loss of battery.
During power ringing, to turn on and maintain the ON state, the ring access switch will draw a nominal 2 mA from the ring
generator.
The Le75181ASC/BSC/CSC device is packaged in a 16-pin, plastic SOIC (GULL) package.
3
Zarlink Semiconductor Inc.
Le75181
CONNECTION DIAGRAMS
Figure 1.
16-Pin SOIC
Data Sheet
FGND
TBAT
TLINE
NC
NC
TRINGING
VDD
TSD
1
2
3
4
16
15
14
13
VBAT
RBAT
RLINE
NC
RRINGING
LATCH
INPUT
DGND
16-Pin SOIC
5
6
7
8
12
11
10
9
Pin Descriptions
Pin Name
D
GND
F
GND
INPUT
LATCH
NC
R
BAT
R
LINE
R
RINGING
T
BAT
T
LINE
T
RINGING
Type
Ground
Ground
Input
Input
—
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Input/Output
Digital ground.
Fault ground.
Logic level input switch control. Internally 75 k
Ω
typical pull down.
Data latch control, active-high, transparent low. Internally 75 k
Ω
typical pull down.
No connection.
Connect to RING on SLIC side.
Connect to RING on line side.
Connect to ringing generator.
Connect to TIP on SLIC side.
Connect to TIP on line side.
Connect to return ground for ringing generator.
Temperature shutdown pin. Can be used as a logic level input or output. See table 8, truth
table, on page 15, and the Switching Behavior section of this data sheet for input pin
description. As an output, will read HIGH when device is in its operational mode and
LOW
in the thermal shutdown mode. In the Le75181, the thermal shutdown mechanism cannot
be disabled.
Battery voltage. Used as a reference for protection circuit.
5-V supply.
Description
T
SD
Input/Output
V
BAT
V
DD
Input
Power
4
Zarlink Semiconductor Inc.
Le75181
ABSOLUTE MAXIMUM RATINGS
Data Sheet
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.
Parameter
Operating Temperature Range
Storage Temperature Range
Relative Humidity Range
Pin Soldering Temperature (t=10 s max)
5-V Power Supply
Battery Supply
Logic Input Voltage
Input-to-output Isolation
Pole-to-pole Isolation (All except SW 4)
Pole-to-pole Isolation (Ringing Access Switch, SW4)
ESD Immunity (Human Body Model)
Min
–40
Max
110
Unit
°C
–40
150
°C
5
95
%
—
260
°C
-0.3
7
V
—
–85
V
-0.3
V
DD
+0.3
V
—
330
V
—
330
V
—
480
V
JESD22 Class 1C compliant
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 245°C during printed circuit board assembly.
Refer to IPC/JEDEC J-Std-020B Table 5-2 for the recommended solder reflow temperature profile.
OPERATING RANGES
Environmental Ranges
Legerity guarantees the performance of this device over commercial (0 to 70º C) and industrial (-40 to 85ºC) 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 GR-357-CORE Component
Reliability Assurance Requirements for Telecommunications Equipment.
Ambient Temperature
−40°
to 85°C
Electrical Ranges
Supply
V
DD
V
BAT
*
Min
4.5
–19
Typ
5
—
Max
5.5
–72
Unit
V
*V
BAT
is used only as a reference for internal protection circuitry. If V
BAT
rises above –10 V, the device will enter an all OFF state and remain in
this state until the battery voltage drops below –15 V.
5
Zarlink Semiconductor Inc.
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