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L7581 Ringing Access Switch
Small size/surface-mount packaging Monolithic reliability impulse noise Make-before-break, break-before-make operation Clean, bounce-free switching Low, matched ON-resistance Built-in current limiting, thermal shutdown, SLIC protection only operation, very power consumption Battery monitor, state upon loss battery Latched logic level inputs, drive circuitry Only external protector required
states: idle talk state (line break switches closed, ringing access switches open), power ringing state (line break switches open, ringing access switches closed), state. L7581 offers break-before-make make-beforebreak switching, with simple logic level input control. Because solid-state construction, voltage transients generated when switching into inductive ringing load during ring cadence ring trip minimized, possibly eliminating need external zero cross switching circuitry. State control logic level inputs, additional driver circuitry required. line break switch linear switch that exceptionally ON-resistance excellent ON-resistance matching characteristic. ringing access switch breakdown voltage rating >480 which sufficiently high, with proper protection, prevent breakdown presence transient fault condition (i.e., passing transient ringing generator). Incorporated into L7581Axx diode bridge/ clamping circuit, current-limiting circuitry, thermal shutdown mechanism provide protection SLIC device subsequent circuitry during fault conditions (see Figure Positive negative lightning reduced current-limiting circuitry steered ground diodes integrated SCR. Power cross also reduced currentlimiting thermal shutdown circuits. L7581Bxx version provides only integrated diode bridge along with current limiting thermal shutdown, shown Figure This will cause positive faults directed ground negative faults battery. either polarity, faults reduced current-limit and/or thermal shutdown mechanisms.
Applications
Central office DAML HFC/FITL
Description
L7581 Ringing Access Switch monolithic solid-state device that provides switching functionality form switch. L7581 designed provide power ringing access ring central office, digital loop carrier, private branch exchange, digitally added main line, hybrid fiber coax/fiber-in-the-loop analog line card applications. L7581 three
L7581 Ringing Access Switch
Description (continued)
protect L7581 from overvoltage fault condition, secondary protector required. secondary protector must limit voltage seen tip/ ring terminals prevent breakdown voltage switches from being exceeded. minimize stress solid-state contacts, foldback- crowbartype secondary protector recommended. With proper choice secondary protection, line card using L7581 will meet relevant ITU-T, LSSGR, FCC, protection requirements. L7581 operates supply only. This gives device extremely idle active power dissipation allows with virtually range battery voltage. This makes L7581 especially appropriate remote power applications such DAML FOC/ FITL other Bellcore applications where power dissipation particularly critical. battery voltage also used L7581, only reference integrated protection circuit. L7581 will enter state upon loss battery. During power ringing, turn maintain state, ring access switch will draw nominal from ring generator. L7581 device packaged 16-pin, plastic package (L7581AC/BC) 16-pin, plastic package (L7581AAE/BAE). These devices compatible with L7541 device.
Information
FGND TBAT TLINE TRINGING
TRIP
VBAT RBAT RLINE RRINGING LATCH INPUT
TEMPERATURE SHUTDOWN
DGND
12-2306.a
Note: Shown with version protection. 16-pin available with either version protection.
Figure 16-Pin, Plastic
FGND registered trademark Underwriters Laboratories, Inc. TBAT TLINE TRINGING
TEMPERATURE SHUTDOWN
VBAT RBAT RLINE RRINGING LATCH INPUT DGND
12-2307.a
Note: Shown with version protection. 16-pin available with either version protection.
Figure 16-Pin, Plastic
Lucent Technologies Inc.
L7581 Ringing Access Switch
Information (continued)
Table Descriptions Symbol FGND TBAT TLINE TRINGING Description Fault ground. connection. Connect SLIC side. Connect line side. Connect return ground ringing generator. supply. Symbol VBAT RBAT LINE RRINGING LATCH INPUT DGND Description Battery voltage. Used reference protection circuit. connection. Connect RING SLIC side. Connect RING line side. Connect ringing generator. Data latch control, active-high, transparent low. Logic level input switch control. Digital ground.
connection. Temperature shutdown pin. used logic level input output. Table Truth Table, Switching Behavior section this data sheet input description. output, will read when device operational mode thermal shutdown mode. L7581, thermal shutdown mechanism cannot disabled.
Absolute Maximum Ratings
Stresses excess absolute maximum ratings cause permanent damage device. These absolute stress ratings only. Functional operation device implied these other conditions excess those given operational sections data sheet. Exposure absolute maximum ratings extended periods adversely affect device reliability. Table Absolute Maximum Ratings Parameters Parameter Operating Temperature Range Storage Temperature Range Relative Humidity Range Soldering Temperature Power Supply Battery Supply Logic Input Voltage Input-to-output Isolation Pole-to-pole Isolation Unit
Handling Precautions
Although protection circuitry been designed into this device, proper precautions should taken avoid exposure electrostatic discharge (ESD) during handling mounting. Lucent Technologies Microelectronics Group employs human-body model (HBM) charged-device model (CDM) ESDsusceptibility testing protection design evaluation. voltage thresholds dependent circuit parameters used define model. industry-wide standard been adopted CDM. However, standard (resistance 1500 capacitance widely used therefore used comparison purposes. threshold presented here obtained using these circuit parameters. Table Threshold Voltage Device L7581 Rating 1000
Lucent Technologies Inc.
L7581 Ringing Access Switch
Electrical Characteristics
unless otherwise specified. Minimum maximum values testing requirements. Typical values characteristics device result engineering evaluations. Typical values information purposes only part testing requirements. Table Power Supply Specifications Supply VBAT* Unit
VBAT used only reference internal protection circuitry. VBAT rises above device will enter state remain this state until battery voltage drops below
Table Break Switches, Parameter OFF-state Leakage Current: ON-resistance (SW1, SW2): ON-resistance Match ON-state Voltage* Current Limit: Dynamic Current Limit <0.5 Test Condition Measure Unit
Vswitch (differential) -320 Vswitch (differential) +260 Vswitch (differential) -330 Vswitch (differential) +270 Vswitch (differential) -310 Vswitch (differential) +250
Iswitch Iswitch Iswitch
TLINE TBAT TLINE TBAT TLINE TBAT ON-resistance test condition SW1, Iswitch ILIMIT Hz/60 Vswitch (on) Vswitch (on) Break switches state; ringing access switches off; apply ±1000 10/1000 pulse; appropriate secondary protection place Vswitch (both poles) ±320 Logic inputs Vswitch (both poles) ±330 Logic inputs Vswitch (both poles) ±310 Logic inputs
Magnitude Iswitch Iswitch Iswitch
19.5 14.5
Isolation: dV/dt Sensitivity
Iswitch Iswitch Iswitch
V/µs
This parameter tested production. Choice secondary protector should ensure this rating exceeded. Applied voltage Vp-p square wave
Lucent Technologies Inc.
L7581 Ringing Access Switch
Electrical Characteristics (continued)
Table Ring Return Switch, Parameter OFF-state Leakage Current (SW3): Current Limit Dynamic Current Limit <0.5 ON-resistance ON-state Voltage* Isolation: dV/dt Sensitivity Test Condition Measure Unit
Vswitch (differential) -320 Vswitch (differential) +260 Vswitch (differential) -330 Vswitch (differential) +270 Vswitch (differential) -310 Vswitch (differential) +250 Vswitch (on) Break switches state; ringing access switches off; apply ±1000 10/1000 pulse; appropriate secondary protection place Iswitch (on) Iswitch ILIMIT Hz/60 Vswitch (both poles) ±320 Logic inputs Vswitch (both poles) ±330 Logic inputs Vswitch (both poles) ±310 Logic inputs
Iswitch Iswitch Iswitch Iswitch Iswitch
Iswitch Iswitch Iswitch
V/µs
This parameter tested production. Choice secondary protector should ensure this rating exceeded. Applied voltage Vp-p square wave
Table Ringing Access Switch, Parameter OFF-state Leakage Current (SW3): Test Condition Measure Unit
ON-resistance Voltage IRINGSOURCE Ring Generator Current During Ring Steady-state Current Surge Current Release Current Isolation: Iswitch Vswitch (both poles) ±320 Logic inputs Iswitch Vswitch (both poles) ±330 Logic inputs Iswitch Vswitch (both poles) ±310 Logic inputs dV/dt Sensitivity
Vswitch (differential) -255 +210 Vswitch (differential) +255 -210 Vswitch (differential) -270 +210 Vswitch (differential) +270 -210 Vswitch (differential) -245 +210 Vswitch (differential) +245 -210 Iswitch (on) Iswitch (on) INPUT
Iswitch Iswitch Iswitch
V/µs
time publication this data sheet, current device design will nominal Devices being redesigned reduce this current less than nominally. Consult your Lucent Technologies Microelectronics Group account executive additional details. Choice secondary protector series current-limit resistor should ensure these ratings exceeded. Applied voltage Vp-p square wave
Lucent Technologies Inc.
L7581 Ringing Access Switch
Electrical Characteristics (continued)
Table Additional Electrical Characteristics Parameter Digital Input Characteristics: Input Voltage Input High Voltage Input Leakage Current (high) Input Leakage Current (low) Power Requirements: Power Dissipation Test Condition VBAT Vlogicin VBAT Vlogicin VBAT Idle/talk state state, ringing state Idle/talk state state, ringing state VBAT Idle/talk state state, ringing state Measure llogicin llogicin Unit
IDD, IBAT IBAT IBAT
Current
0.750
VBAT Current
Temperature Shutdown Requirements:* Shutdown Activation Temperature Shutdown Circuit Hysteresis
Temperature shutdown flag (TSD) will high during normal operation during temperature shutdown state.
Zero Cross Current Turn
ring access switch (SW4) designed turn next zero current crossing after application appropriate logic input control. This switch requires current zero cross turn off. Switch once will remain state (regardless logic input) until current zero cross. Therefore, ensure proper operation switch this switch should connected, proper impedance, ringing generator some other source. attempt switch pure with switch detailed explanation operation switch please refer Introduction L758X Series Line Card Access Switches Application Note.
Switching Behavior
When switching from power ringing state idle/ talk state simple logic level input control, L7581 able provide control with respect timing when ringing access contacts released relative state line break contacts. Make-before-break operation occurs when line break switch contacts closed made) before ringing access switch contact opened broken). Break-before-make operation occurs when ringing access contact opened (broke) before line break switch contacts closed (made). Using logic level input pins INPUT TSD, either make-before-break break-before-make operation L7581 easily achieved. logic sequences either mode operation given Table Table Truth Table (Table explanation logic states.
Lucent Technologies Inc.
L7581 Ringing Access Switch
current excess SCR's turn-on current also available, turn Once triggered SLIC capable supplying current excess holding current, latched SLIC. probability this event depends characteristics given SLIC holding current L7581A device. hold current distribution designed safely away from test limit higher distribution, lower probability latch. this situation concern given board design, either series device break-before-make mode (eliminates original current pulse) series device (eliminates SCR).
Switching Behavior (continued)
When using L7581 make-before-break mode, during ring-to-idle transition, period one-half ringing frequency, ring break switch pnpn-type ring access switch both state. This maximum time after logic signal INRING transitioned that ring access switch waiting next zero current cross close. During this interval, current that limited break switch current-limit value will sourced from ring node SLIC. This current presented internal protection circuit. SCR-type protector used code), random probability ring-to-idle transition occurs during portion ring cycle when ringing voltage exceeds protection circuit turn-on voltage,
Table Make-Before-Break Operation INPUT V/Float V/Float State Timing Break Ring Return Switches Switch Open Closed Closed Open Ring Access Switch Closed Closed
V/Float
Power Ringing Make- waiting next zero current before- crossing turn off, maximum break time-one-half ringing. this transition state, current that limited break switch current-limit value will sourced from ring node SLIC. Idle/Talk Zero cross current occurred.
Closed
Open
Open
Table Break-Before-Make Operation INPUT V/Float State Power Ringing Timing Break Ring Return Switches Switch Open Open Open Closed Open Open Ring Access Switch Closed Closed Open
V/Float
Hold this state waiting zero current turn off. Zero current occurred opened. Transition INPUT should occur during hold. Idle/Talk Release break switch pair.
Closed
Open
Open
Lucent Technologies Inc.
L7581 Ringing Access Switch
Power Supplies
Both battery supply brought onto L7581. L7581 requires only supply switch operation; that state control powered exclusively supply. Because this, L7581 offers extremely power dissipation, both idle active states. battery voltage used switch state control. battery used reference voltage integrated secondary protection circuit. When voltage TBAT RBAT drops below battery, integrated will trigger, thus preventing faultinduced overvoltage situations TBAT/RBAT nodes.
Protection
Integrated SLIC Protection
Diode Bridge/SCR L7581Axx version, protection SLIC device other subsequent circuitry provided combination current-limited break switches, diode bridge/ clamping circuit, thermal shutdown mechanism. L7581Bxx version, protection SLIC device other subsequent circuitry provided combination current-limited break switches, diode bridge, thermal shutdown mechanism. both versions, during positive lightning event, fault current directed ground steering diodes diode bridge. Voltage clamped diode drop above ground. version, negative lightning causes conduct when voltage goes more negative than battery, fault currents directed ground steering diodes diode bridge. Note that foldback crowbar, voltage (see Table must less negative than battery reference voltage. battery voltage less negative than voltage, will conduct fault currents ground; however, will crowbar. version, negative lightning directed battery steering diodes diode bridge. power cross power induction faults, both versions, positive cycle fault clamped diode drop above ground fault currents steered ground. version, negative cycle will cause trigger when voltage exceeds battery reference voltage When triggers, fault current steered ground. version, negative cycle power cross steered battery. Current Limiting During lightning event, current that passed through break switches presented integrated protection circuit subsequent circuitry limited dynamic current-limit response break switches (assuming idle/talk state). When voltage seen TLINE/RLINE nodes properly clamped external secondary protector, upon application 1000 1000 pulse (LSSGR lightning), current seen TBAT/RBAT nodes will typically pulse magnitude duration less than
Loss Battery Voltage
additional protection feature, L7581 monitors battery voltage. Upon loss battery voltage, L7581 will automatically enter state remain that state until battery voltage restored. L7581 designed that device will enter state battery rises above will remain until battery drops below Monitoring battery automatic shutdown feature will draw small current from battery, typically This will slightly overall power dissipation device.
Impulse Noise
Using L7581 will minimize possibly eliminate contribution overall system impulse noise that associated with ringing access switches. Because this characteristic L7581, necessary incorporate zero cross switching scheme. This ultimately depends upon characteristics individual system best evaluated board level.
Lucent Technologies Inc.
L7581 Ringing Access Switch
L7581, thermal shutdown mechanism cannot disabled logic control pin. functionality differs from L7541, L7582, L7583. proper understanding caveats related TSD, please refer appropriate data sheet specifications. Electrical specifications relating overvoltage clamping circuit outlined Table External Secondary Protector With above integrated protection features, only overvoltage secondary protection device loop side L7581 required. purpose this device limit fault voltages seen L7581 exceed breakdown voltage input-output isolation rating device. minimize stress L7581, foldback- crowbar-type device recommended. detailed explanation design equations choice external secondary protection device given Introduction L758X Series Line Card Access Switches Application Note. Basic design equations governing choice external secondary protector given below:
Protection (continued)
Integrated SLIC Protection (continued)
During power cross event, current that passed through break switches presented integrated protection circuit subsequent circuitry limited current-limit response break switches (assuming idle/talk state). current limit specified over temperature between Note that current-limit circuitry negative temperature coefficient. Thus, device subjected extended power cross, value current seen TBAT/RBAT will decrease device heats fault current. sufficient heating occurs, temperature shutdown mechanism will activate device will enter mode. Temperature Shutdown Mechanism When device temperature reaches minimum thermal shutdown mechanism will activate force device into state, regardless logic input pins. TSD, when used output, will read when device thermal shutdown mode +VDD during normal operation. During lightning event, relatively short duration, thermal shutdown will typically activate. During extended power cross, device temperature will rise cause device enter thermal shutdown mode. This forces mode, current seen TBAT/RBAT drops zero. Once thermal shutdown mode, device will cool exit thermal shutdown mode, thus reentering state prior thermal shutdown. Current, limited current-limit value, will again begin flow device heating will begin again. This cycle entering exiting thermal shutdown will last long power cross fault present. frequency entering exiting thermal shutdown will depend magnitude power cross. magnitude power cross great enough, external secondary protector trigger shunting current ground.
|VBATmax| |Vbreakovermax| |Vbreakdownmin(break)| |Vringingpeakmax| |VBATmax| |Vbreakovermax| |Vbreakdownmin(ring)| |Vringingpeakmax| |VBATmax| |Vbreakovermin|
where: VBATmax-Maximum magnitude battery voltage. Vbreakovermax-Maximum magnitude breakover voltage external secondary protector. Vbreakovermin-Minimum magnitude breakover voltage external secondary protector. Vbreakdownmin(break)-Minimum magnitude breakdown voltage L7581 break switch. Vbreakdownmin(ring)-Minimum magnitude breakdown voltage L7581 ring access switch. Vringingpeakmax-Maximum magnitude peak voltage ringing signal. Series current-limiting fused resistors PTCs should chosen exceed current rating external secondary protector. Refer manufacturer's data sheet specifications.
Lucent Technologies Inc.
L7581 Ringing Access Switch
Protection (continued)
Integrated SLIC Protection (continued)
Table Electrical Specifications, Protection Circuitry Parameters Related Diodes Diode Bridge) Parameter Test Condition Measure Voltage Drop Continuous CurApply current limit Forward rent Hz/60 break switches Voltage Voltage Drop Surge Apply ±dynamic curForward Current rent limit break Voltage switches Parameters Related Protection Surge Current Gate Trigger Current* Gate Trigger Current Temperature Coefficient Hold Current Gate Trigger Voltage Trigger current VBAT Reverse Leakage Current VBAT ON-State Voltage Unit
-0.5
%/°C
VBAT
Previous versions this data sheet specified Trigger Current minimum. Trigger Current defined minimum current drawn from ring turn SCR. specification this data sheet Gate Trigger Current, which defined maximum current that flow into battery before turns Typical Twice dynamic current limit break switches. some instances, typical ON-state voltage range
Lucent Technologies Inc.
L7581 Ringing Access Switch
Typical Performance Characteristics
ILIMIT CURRENT-LIMIT BREAK SWITCHES -1.5 VBAT CURRENT LIMITING
VBAT VBAT
ILIMIT
12-2311
CURRENT LIMIT BREAK SWITCHES)
12-2309.f
CURRENT LIMITING
Figure Switches
Figure Protection Circuit Version
CURRENT-LIMIT BREAK SWITCHES -VOS VBAT VBAT +VOS
12-2312
CURRENT LIMIT BREAK SWITCHES)
12-2309.b
Figure Switch
Figure Protection Circuit Version
Lucent Technologies Inc.
L7581 Ringing Access Switch
Application
VBAT (REFERENCE)
CROWBAR PROTECTION
TRIP
BATTERY FEED
RING RING
RING GENERATOR BATTERY
12-3074.e
Figure Typical Application, Version, Idle, Talk State Shown Table Truth Table INPUT Don't Care Break Switch Ring Break Switch V/Float1 V/Float Ringing Return Switch Ring Switch Off3 Off5
Thermal shutdown mechanism active with floating equal Forcing ground overrides logic input pins forces state. Idle/Talk state. Power ringing state. state.
parallel in/parallel data latch integrated into L7581. Operation data latch controlled logic level input LATCH. data input latch INPUT L7581, output data latch internal node used state control. When LATCH control logic data latch transparent data control signals flow directly from INPUT, through data latch state control. changes INPUT will reflected state switches. When LATCH control logic data latch active-the L7581 will longer react changes INPUT control pin. state switches latched; that state switches will remain they were when LATCH input transitioned from logic logic switches will respond changes INPUT long LATCH held high. Note that input tied data latch. affected LATCH input. input will override state control INPUT LATCH. Lucent Technologies Inc.
L7581 Ringing Access Switch
Outline Diagrams
16-Pin, Plastic (L7581AAE/BAE)
Note: dimensions this outline diagram intended informational purposes only. detailed schematics assist your design efforts, please contact your Lucent Technologies Sales Representative.
IDENTIFIER ZONE
SEATING PLANE 0.10 1.27 0.51 0.28 0.61
Number Pins
Maximum Length 10.49
Maximum Width Without Leads 7.62
Maximum Width Including Leads 10.64
Maximum Height Above Board 2.67
5-4414r2
Lucent Technologies Inc.
L7581 Ringing Access Switch
Outline Diagrams (continued)
16-Pin, Plastic (L7581AC/BC)
Note: dimensions this outline diagram intended informational purposes only. detailed schematics assist your design efforts, please contact your Lucent Technologies Sales Representative.
IDENTIFIER ZONE
SEATING PLANE 0.38 2.54 0.58
Number Pins
Maximum Length 20.57
Maximum Width Without Leads 6.48
Maximum Width Including Leads 7.87
Maximum Height Above Board 5.08
5-4410
Lucent Technologies Inc.
L7581 Ringing Access Switch
Ordering Information
Device Part ATTL7581AAE ATTL7581AAE-TR* ATTL7581AC ATTL7581BAE ATTL7581BAE-TR* ATTL7581BC Description Ringing Access Switch Ringing Access Switch Ringing Access Switch Ringing Access Switch Ringing Access Switch Ringing Access Switch Package 16-Pin 16-Pin (Tape Reel) 16-Pin 16-Pin 16-Pin (Tape Reel) 16-Pin Comcode 107338469 107338493 107338436 107392839 107392953 107392995
*Devices tape reel must ordered 1000-piece increments.
Lucent Technologies Inc.
additional information, contact your Microelectronics Group Account Manager following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com AMERICA: Microelectronics Group, Lucent Technologies Inc., Union Boulevard, Room 30L-15P-BA, Allentown, 18103 1-800-372-2447, 610-712-4106 CANADA: 1-800-553-2448, 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 8833, (65) 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Fong Universe Building, 1800 Zhong Shan Road, Shanghai 200233 China Tel. (86) 6440 0468, ext. 316, (86) 6440 0652 JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 5421 1600, (81) 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 7000 368, (44) 1189 Technical Inquiries: GERMANY: (49) 95086 (Munich), UNITED KINGDOM: (44) 1344 (Ascot), FRANCE: (33) (Paris), SWEDEN: (46) (Stockholm), FINLAND: (358) 4354 2800 (Helsinki), ITALY: (39) 6608131 (Milan), SPAIN: (34) 1441 (Madrid)
Lucent Technologies Inc. reserves right make changes product(s) information contained herein without notice. liability assumed result their application. rights under patent accompany sale such product(s) information.
Copyright 1999 Lucent Technologies Inc. Rights Reserved
November 1999 DS00-050ALC (Replaces DS99-014ALC)
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