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Data Sheet November 1999
L7581 Ringing Access Switch
Features
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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
states: the idle talk state (line break switches closed, ringing access switches open), the power ringing state (line break switches open, ringing access switches closed), and an all OFF state. The L7581 offers break-before-make or make-beforebreak 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 L7581Axx 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 Figure 1). 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 currentlimiting and thermal shutdown circuits. The L7581Bxx version provides only an integrated diode bridge along with current limiting and thermal shutdown, as shown in Figure 2. 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.
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Applications
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Central office DLC PBX DAML HFC/FITL
Description
The L7581 Ringing Access Switch is a monolithic solid-state device that provides the switching functionality of a 2 form C switch. The L7581 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 L7581 has three
L7581 Ringing Access Switch
Data Sheet November 1999
Description (continued)
To protect the L7581 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 crowbartype secondary protector is recommended. With proper choice of secondary protection, a line card using the L7581 will meet all relevant ITU-T, LSSGR, FCC, or UL* protection requirements. The L7581 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 L7581 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 L7581, only as a reference for the integrated protection circuit. The L7581 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 or 4 mA from the ring generator. The L7581 device is packaged in a 16-pin, plastic DIP package (L7581AC/BC) and a 16-pin, plastic SOG package (L7581AAE/BAE). These devices are pin compatible with the L7541 device.
Pin Information
FGND NC TBAT TLINE TRINGING VDD NC TSD
1 2 3 4 5 6 7 8
SCR AND TRIP CKT
16 VBAT 15 NC 14 RBAT 13 RLINE 12 RRINGING 11 LATCH 10 INPUT
SW1
SW2
SW3
SW4
TEMPERATURE SHUTDOWN
9
DGND
12-2306.a (C)
Note: Shown with A version protection. The 16-pin DIP is available with either A or B version protection.
Figure 1. 16-Pin, Plastic DIP
FGND * UL is a registered trademark of Underwriters Laboratories, Inc. TBAT TLINE NC NC TRINGING VDD TSD
1 2 SW1 3 SW3 4 5 6 7 8 TEMPERATURE SHUTDOWN SW2 SW4
16 VBAT 15 RBAT 14 RLINE 13 NC 12 RRINGING 11 LATCH 10 INPUT 9 DGND
12-2307.a (F)
Note: Shown with B version protection. The 16-pin SOG is available with either A or B version protection.
Figure 2. 16-Pin, Plastic SOG
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Data Sheet November 1999
L7581 Ringing Access Switch
Pin Information (continued)
Table 1. Pin Descriptions DIP SOG 1 1 2 3 4 5 6 7 8 4 2 3 6 7 5 8 Symbol FGND NC TBAT TLINE TRINGING VDD NC TSD Description Fault ground. No connection. Connect to TIP on SLIC side. Connect to TIP on line side. Connect to return ground for ringing generator. 5 V supply. DIP SOG 16 16 15 14 13 12 11 13 15 14 12 11 10 9 Symbol VBAT NC RBAT RLINE RRINGING LATCH INPUT DGND Description Battery voltage. Used as a reference for protection circuit. No connection. Connect to RING on SLIC side. Connect to RING on line side. Connect to ringing generator. Data latch control, active-high, transparent low. Logic level input switch control. Digital ground.
No connection. 10 9 Temperature shutdown pin. Can be used as a logic level input or output. See Table 12, Truth Table, and the Switching Behavior section of this data sheet for input pin description. As an output, will read 5 V when device is in its operational mode and 0 V in the thermal shutdown mode. In the L7581, the thermal shutdown mechanism cannot be disabled.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device reliability. Table 2. Absolute Maximum Ratings Parameters Parameter Operating Temperature Range Storage Temperature Range Relative Humidity Range Pin Soldering Temperature 5 V Power Supply Battery Supply Logic Input Voltage Input-to-output Isolation Pole-to-pole Isolation Min -40 -40 5 -- -- -- -- -- -- Max 110 150 95 10 7 -85 7 330 330 Unit C C % C V V V V V
Handling Precautions
Although protection circuitry has been designed into this device, proper precautions should be taken to avoid exposure to electrostatic discharge (ESD) during handling and mounting. Lucent Technologies Microelectronics Group employs a human-body model (HBM) and a charged-device model (CDM) for ESDsusceptibility testing and protection design evaluation. ESD voltage thresholds are dependent on the circuit parameters used to define the model. No industry-wide standard has been adopted for CDM. However, a standard HBM (resistance = 1500 , capacitance = 100 pF) is widely used and therefore can be used for comparison purposes. The HBM ESD threshold presented here was obtained by using these circuit parameters. Table 3. HBM ESD Threshold Voltage Device L7581 Rating 1000 V
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L7581 Ringing Access Switch
Data Sheet November 1999
Electrical Characteristics
TA = -40 C to +85 C, unless otherwise specified. Minimum and maximum values are testing requirements. Typical values are characteristics of the device and are the result of engineering evaluations. Typical values are for information purposes only and are not part of the testing requirements. Table 4. Power Supply Specifications Supply VDD VBAT* Min 4.5 -19 Typ 5 -- Max 5.5 -72 Unit V V
* VBAT is used only as a reference for internal protection circuitry. If VBAT 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.
Table 5. Break Switches, 1 and 2 Parameter OFF-state Leakage Current: +25 C +85 C -40 C ON-resistance (SW1, SW2): +25 C +85 C -40 C ON-resistance Match ON-state Voltage* dc Current Limit: +85 C -40 C Dynamic Current Limit (t = <0.5 s) Test Condition Measure Min Typ Max Unit
Vswitch (differential) = -320 V to Gnd Vswitch (differential) = -60 V to +260 V Vswitch (differential) = -330 V to Gnd Vswitch (differential) = -60 V to +270 V Vswitch (differential) = -310 V to Gnd Vswitch (differential) = -60 V to +250 V
Iswitch Iswitch Iswitch
-- -- --
-- -- --
1 1 1
A A A
TLINE = 10 mA, 40 mA, TBAT = -2 V TLINE = 10 mA, 40 mA, TBAT = -2 V TLINE = 10 mA, 40 mA, TBAT = -2 V Per ON-resistance test condition of SW1, SW2 Iswitch = ILIMIT @ 50 Hz/60 Hz Vswitch (on) = 10 V Vswitch (on) = 10 V Break switches in ON state; ringing access switches off; apply 1000 V at 10/1000 s pulse; appropriate secondary protection in place Vswitch (both poles) = 320 V, Logic inputs = Gnd Vswitch (both poles) = 330 V, Logic inputs = Gnd Vswitch (both poles) = 310 V, Logic inputs = Gnd --
VON VON VON Magnitude RON SW1 - RON SW2 VON Iswitch Iswitch Iswitch
-- -- -- -- -- 80 -- --
19.5 -- 14.5 0.2 -- -- -- 2.5
-- 28 -- 1.0 220 -- 250 --
V mA mA A
Isolation: +25 C +85 C -40 C dV/dt Sensitivity
Iswitch Iswitch Iswitch --
-- -- -- --
-- -- -- 200
1 1 1 --
A A A V/s
* This parameter is not tested in production. Choice of secondary protector should ensure this rating is not exceeded. Applied voltage is 100 Vp-p square wave at 100 Hz.
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Data Sheet November 1999
L7581 Ringing Access Switch
Electrical Characteristics (continued)
Table 6. Ring Return Switch, 3 Parameter OFF-state Leakage Current (SW3): +25 C +85 C -40 C dc Current Limit Dynamic Current Limit (t = <0.5 s) ON-resistance ON-state Voltage* Isolation: +25 C +85 C -40 C dV/dt Sensitivity Test Condition Measure Min Typ Max Unit
Vswitch (differential) = -320 V to Gnd Vswitch (differential) = -60 V to +260 V Vswitch (differential) = -330 V to Gnd Vswitch (differential) = -60 V to +270 V Vswitch (differential) = -310 V to Gnd Vswitch (differential) = -60 V to +250 V Vswitch (on) = 10 V Break switches in ON state; ringing access switches off; apply 1000 V at 10/1000 s pulse; appropriate secondary protection in place Iswitch (on) = 0 mA, 10 mA Iswitch = ILIMIT @ 50 Hz/60 Hz Vswitch (both poles) = 320 V, Logic inputs = Gnd Vswitch (both poles) = 330 V, Logic inputs = Gnd Vswitch (both poles) = 310 V, Logic inputs = Gnd --
Iswitch Iswitch Iswitch Iswitch Iswitch
-- -- -- -- --
-- -- -- 200 2.5
1 1 1 -- --
A A A mA A
VON VON Iswitch Iswitch Iswitch --
-- -- -- -- -- --
-- -- -- -- -- 200
100 130 1 1 1 --
V A A A V/s
* This parameter is not tested in production. Choice of secondary protector should ensure this rating is not exceeded. Applied voltage is 100 Vp-p square wave at 100 Hz.
Table 7. Ringing Access Switch, 4 Parameter OFF-state Leakage Current (SW3): +25 C +85 C -40 C Test Condition Measure Min Typ Max Unit
ON-resistance VON ON Voltage -- IRINGSOURCE Ring Generator Current During Ring Steady-state Current -- Surge Current -- Release Current -- Isolation: Iswitch Vswitch (both poles) = 320 V, Logic inputs = Gnd +25 C Iswitch Vswitch (both poles) = 330 V, Logic inputs = Gnd +85 C Iswitch Vswitch (both poles) = 310 V, Logic inputs = Gnd -40 C -- -- dV/dt Sensitivity
Vswitch (differential) = -255 V to +210 V Vswitch (differential) = +255 V to -210 V Vswitch (differential) = -270 V to +210 V Vswitch (differential) = +270 V to -210 V Vswitch (differential) = -245 V to +210 V Vswitch (differential) = +245 V to -210 V Iswitch (on) = 70 mA, 80 mA Iswitch (on) = 1 mA VCC = 5 V INPUT = 1 -- -- --
Iswitch Iswitch Iswitch
-- -- -- -- -- -- -- -- -- -- -- -- --
-- -- -- -- -- * -- -- 500 -- -- -- 200
1 1 1 12 3 -- 150 2 -- 1 1 1 --
A A A V mA mA A A A A A V/s
* At the time of publication of this data sheet, the current device design will be a nominal 4 mA. Devices are being redesigned to reduce this current to less than 2 mA nominally. Consult your Lucent Technologies Microelectronics Group account executive for additional details. Choice of secondary protector and series current-limit resistor should ensure these ratings are not exceeded. Applied voltage is 100 Vp-p square wave at 100 Hz.
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L7581 Ringing Access Switch
Data Sheet November 1999
Electrical Characteristics (continued)
Table 8. Additional Electrical Characteristics Parameter Digital Input Characteristics: Input Low Voltage Input High Voltage Input Leakage Current (high) Input Leakage Current (low) Power Requirements: Power Dissipation Test Condition -- -- VDD = 5.5 V, VBAT = -75 V, Vlogicin = 5 V VDD = 5.5 V, VBAT = -75 V, Vlogicin = 0 V VDD = 5 V, VBAT = -48 V, Idle/talk state or all OFF state, ringing state VDD = 5 V, Idle/talk state or all OFF state, ringing state VBAT = -48 V, Idle/talk state or all OFF state, ringing state -- -- Measure -- -- llogicin llogicin Min -- 3.5 -- -- Typ -- -- -- -- Max Unit 1.5 -- 1 1 V V A A
IDD, IBAT IDD IDD IDD IBAT IBAT -- --
-- -- -- -- -- -- 110 10
3 6
5 10
mW mW A mA A A C C
VDD Current
560 900 0.750 1.9 4 4 125 -- 10 10 150 25
VBAT Current
Temperature Shutdown Requirements:* Shutdown Activation Temperature Shutdown Circuit Hysteresis
* Temperature shutdown flag (TSD) will be high during normal operation and low during temperature shutdown state.
Zero Cross Current Turn Off
The ring access switch (SW4) is designed to turn off on the next zero current crossing after application of the appropriate logic input control. This switch requires a current zero cross to turn off. Switch 4, once on, will remain in the ON state (regardless of logic input) until a current zero cross. Therefore, to ensure proper operation of switch 4, this switch should be connected, via proper impedance, to the ringing generator or some other ac source. Do not attempt to switch pure dc with switch 4. For a detailed explanation of the operation of switch 4, please refer to the An Introduction to L758X Series of Line Card Access Switches Application Note.
Switching Behavior
When switching from the power ringing state to the idle/ talk state via simple logic level input control, the L7581 is able to provide control with respect to the timing when the ringing access contacts are released relative to the state of the line break contacts. Make-before-break operation occurs when the line break switch contacts are closed (or made) before the ringing access switch contact is opened (or broken). Break-before-make operation occurs when the ringing access contact is opened (broke) before the line break switch contacts are closed (made). Using the logic level input pins INPUT and TSD, either make-before-break or break-before-make operation of the L7581 is easily achieved. The logic sequences for either mode of operation are given in Table 9 and Table 10. See the Truth Table (Table 12) for an explanation of the logic states.
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Data Sheet November 1999
L7581 Ringing Access Switch
and if current in excess of the SCR's turn-on current is also available, the SCR may turn on. Once the SCR is triggered on, if the SLIC is capable of supplying current in excess of the holding current, the SCR may be latched on by the SLIC. The probability of this event depends on the characteristics of the given SLIC and of the holding current of the L7581A device. The SCR hold current distribution is designed to be safely away from the test limit of 80 mA. The higher the distribution, the lower the probability of the latch. If this situation is of concern for a given board design, either use the A series device in the break-before-make mode (eliminates the original 25 ms current pulse) or use a B series device (eliminates the SCR).
Switching Behavior (continued)
When using an L7581 in the make-before-break mode, during the ring-to-idle transition, for a period of up to one-half the ringing frequency, the ring break switch and the pnpn-type ring access switch can both be in the ON state. This is the maximum time after the logic signal at INRING has transitioned that the ring access switch is waiting for the next zero current cross so it can close. During this interval, current that is limited to the dc break switch current-limit value will be sourced from the ring node of the SLIC. This current is presented to the internal protection circuit. If the SCR-type protector is used (A code), if by random probability the ring-to-idle transition occurs during a portion of the ring cycle when the ringing voltage exceeds the protection circuit SCR turn-on voltage,
Table 9. Make-Before-Break Operation INPUT 5V 0V TSD 5 V/Float 5 V/Float State Timing Break Ring Return Switches 1 & 2 Switch 3 Open Closed Closed Open Ring Access Switch 4 Closed Closed
0V
5 V/Float
Power -- Ringing Make- SW4 waiting for next zero current before- crossing to turn off, maximum break time--one-half of ringing. In this transition state, current that is limited to the dc break switch current-limit value will be sourced from the ring node of the SLIC. Idle/Talk Zero cross current has occurred.
Closed
Open
Open
Table 10. Break-Before-Make Operation INPUT 5V 5V 0V TSD 5 V/Float 0V 0V State Power Ringing All Off Timing -- Break Ring Return Switches 1 & 2 Switch 3 Open Open Open Closed Open Open Ring Access Switch 4 Closed Closed Open
0V
5 V/Float
Hold this state for 25 ms. SW4 waiting for zero current to turn off. All Off Zero current has occurred and SW4 has opened. Transition on INPUT should occur during 25 ms hold. Idle/Talk Release break switch pair.
Closed
Open
Open
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L7581 Ringing Access Switch
Data Sheet November 1999
Power Supplies
Both the 5 V and battery supply are brought onto the L7581. The L7581 requires only the 5 V supply for switch operation; that is, state control is powered exclusively off of the 5 V supply. Because of this, the L7581 offers extremely low power dissipation, both in the idle and active states. The battery voltage is not used for switch state control. The battery is used as a reference voltage by the integrated secondary protection circuit. When the voltage at TBAT or RBAT drops 2 V to 4 V below the battery, the integrated SCR will trigger, thus preventing faultinduced overvoltage situations at the TBAT/RBAT nodes.
Protection
Integrated SLIC Protection
Diode Bridge/SCR In the L7581Axx version, protection to the SLIC device or other subsequent circuitry is provided by a combination of current-limited break switches, a diode bridge/ SCR clamping circuit, and a thermal shutdown mechanism. In the L7581Bxx version, protection to the SLIC device or other subsequent circuitry is provided by a combination of current-limited break switches, a diode bridge, and a thermal shutdown mechanism. In both versions, during a positive lightning event, fault current is directed to ground via steering diodes in the diode bridge. Voltage is clamped to a diode drop above ground. In the A version, negative lightning causes the SCR to conduct when the voltage goes 2 V to 4 V more negative than the battery, and fault currents are directed to ground via the SCR and steering diodes in the diode bridge. Note that for the SCR to foldback or crowbar, the ON voltage (see Table 10) of the SCR must be less negative than the battery reference voltage. If the battery voltage is less negative than the SCR ON voltage, the SCR will conduct fault currents to ground; however, it will not crowbar. In the B version, negative lightning is directed to battery via steering diodes in the diode bridge. For power cross and power induction faults, in both versions, the positive cycle of the fault is clamped a diode drop above ground and fault currents steered to ground. In the A version, the negative cycle will cause the SCR to trigger when the voltage exceeds the battery reference voltage by 2 V to 4 V. When the SCR triggers, fault current is steered to ground. In the B version, the negative cycle of the power cross is steered to battery. Current Limiting During a lightning event, the current that is passed through the break switches and presented to the integrated protection circuit and subsequent circuitry is limited by the dynamic current-limit response of the break switches (assuming idle/talk state). When the voltage seen at the TLINE/RLINE nodes is properly clamped by an external secondary protector, upon application of a 1000 V 10 x 1000 pulse (LSSGR lightning), the current seen at the TBAT/RBAT nodes will typically be a pulse of magnitude 2.5 A and duration less than 0.5 s.
Loss of Battery Voltage
As an additional protection feature, the L7581 monitors the battery voltage. Upon loss of battery voltage, the L7581 will automatically enter an all OFF state and remain in that state until the battery voltage is restored. The L7581 is designed so that the device will enter the all OFF state if the battery rises above -10 V and will remain off until the battery drops below -15 V. Monitoring the battery for the automatic shutdown feature will draw a small current from the battery, typically 4 A. This will add slightly to the overall power dissipation of the device.
Impulse Noise
Using the L7581 will minimize and possibly eliminate the contribution to the overall system impulse noise that is associated with ringing access switches. Because of this characteristic of the L7581, it may not be necessary to incorporate a zero cross switching scheme. This ultimately depends upon the characteristics of the individual system and is best evaluated at the board level.
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Data Sheet November 1999
L7581 Ringing Access Switch
In the L7581, the thermal shutdown mechanism cannot be disabled by logic control at the TSD pin. The functionality of TSD differs from the L7541, L7582, and L7583. For the proper use of and understanding of any caveats related to TSD, please refer to the appropriate data sheet specifications. Electrical specifications relating to the overvoltage clamping circuit are outlined in Table 11. External Secondary Protector With the above integrated protection features, only one overvoltage secondary protection device on the loop side of the L7581 is required. The purpose of this device is to limit fault voltages seen by the L7581 so as not to exceed the breakdown voltage or input-output isolation rating of the device. To minimize stress on the L7581, use of a foldback- or crowbar-type device is recommended. A detailed explanation and design equations on the choice of the external secondary protection device are given in the An Introduction to L758X Series of Line Card Access Switches Application Note. Basic design equations governing the choice of external secondary protector are given below:
s s
Protection (continued)
Integrated SLIC Protection (continued)
During a power cross event, the current that is passed through the break switches and presented to the integrated protection circuit and subsequent circuitry is limited by the dc current-limit response of the break switches (assuming idle/talk state). The dc current limit is specified over temperature between 100 mA and 250 mA. Note that the current-limit circuitry has a negative temperature coefficient. Thus, if the device is subjected to an extended power cross, the value of current seen at TBAT/RBAT will decrease as the device heats due to the fault current. If sufficient heating occurs, the temperature shutdown mechanism will activate and the device will enter an all off mode. Temperature Shutdown Mechanism When the device temperature reaches a minimum of 110 C, the thermal shutdown mechanism will activate and force the device into an all OFF state, regardless of the logic input pins. Pin TSD, when used as an output, will read 0 V when the device is in the thermal shutdown mode and +VDD during normal operation. During a lightning event, due to the relatively short duration, the thermal shutdown will not typically activate. During an extended power cross, the device temperature will rise and cause the device to enter the thermal shutdown mode. This forces an all off mode, and the current seen at TBAT/RBAT drops to zero. Once in the thermal shutdown mode, the device will cool and exit the thermal shutdown mode, thus reentering the state it was in prior to thermal shutdown. Current, limited to the dc current-limit value, will again begin to flow and device heating will begin again. This cycle of entering and exiting thermal shutdown will last as long as the power cross fault is present. The frequency of entering and exiting thermal shutdown will depend on the magnitude of the power cross. If the magnitude of the power cross is great enough, the external secondary protector may trigger shunting all current to ground.
|VBATmax| + |Vbreakovermax| < |Vbreakdownmin(break)| |Vringingpeakmax| + |VBATmax| + |Vbreakovermax| < |Vbreakdownmin(ring)| |Vringingpeakmax| + |VBATmax| < |Vbreakovermin|
s
where: VBATmax--Maximum magnitude of battery voltage. Vbreakovermax--Maximum magnitude breakover voltage of external secondary protector. Vbreakovermin--Minimum magnitude breakover voltage of external secondary protector. Vbreakdownmin(break)--Minimum magnitude breakdown voltage of L7581 break switch. Vbreakdownmin(ring)--Minimum magnitude breakdown voltage of L7581 ring access switch. Vringingpeakmax--Maximum magnitude peak voltage of ringing signal. Series current-limiting fused resistors or PTCs should be chosen so as not to exceed the current rating of the external secondary protector. Refer to the manufacturer's data sheet for specifications.
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L7581 Ringing Access Switch
Data Sheet November 1999
Protection (continued)
Integrated SLIC Protection (continued)
Table 11. Electrical Specifications, Protection Circuitry Parameters Related to Diodes (in Diode Bridge) Parameter Test Condition Measure Min Voltage Drop @ Continuous CurApply dc current limit Forward -- rent (50 Hz/60 Hz) of break switches Voltage Voltage Drop @ Surge Apply dynamic curForward -- Current rent limit of break Voltage switches Parameters Related to Protection SCR Surge Current -- -- -- -- -- -- Gate Trigger Current* Gate Trigger Current Temperature -- -- -- Coefficient Hold Current -- -- 70 Gate Trigger Voltage Trigger current -- VBAT - 4 Reverse Leakage Current VBAT -- -- ON-State Voltage 0.5 A, t = 0.5 s VON -- 2.0 A, t = 0.5 s -- -- Typ -- 5 Max 3 -- Unit V V
-- 25 -0.5 -- -- -- -3 -5
50 --
A mA %/C mA V A V V
VBAT - 2 1.0 -- --
* Previous versions of this data sheet specified a Trigger Current of 50 mA minimum. Trigger Current is defined as the minimum current drawn from tip and ring to turn on the SCR. The specification in this data sheet is Gate Trigger Current, which is defined as the maximum current that can flow into the battery before the SCR turns on. Typical at 25 C. Twice dynamic current limit of break switches. In some instances, the typical ON-state voltage can range as low as -25 V.
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Data Sheet November 1999
L7581 Ringing Access Switch
Typical Performance Characteristics
+I ILIMIT dc CURRENT-LIMIT BREAK SWITCHES -1.5 V VBAT VON <1 A 3V -V RON RON 1.5 V +V 2/3 RON CURRENT LIMITING
VBAT - 2 VBAT - 4
2/3 RON ILIMIT -I
12-2311 (F)
50 mA dc CURRENT LIMIT (OF BREAK SWITCHES) IH
12-2309.f (F)
CURRENT LIMITING
Figure 5. Switches 1--3
Figure 3. Protection Circuit A Version
+I RON
dc CURRENT-LIMIT BREAK SWITCHES -VOS -V VBAT - 3 VBAT <1 A 3V +VOS +V
-I
12-2312 (F)
dc CURRENT LIMIT (OF BREAK SWITCHES)
12-2309.b (F)
Figure 6. Switch 4
Figure 4. Protection Circuit B Version
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L7581 Ringing Access Switch
Data Sheet November 1999
Application
VBAT (REFERENCE)
SW3 R1 TIP SW1 TIP
CROWBAR PROTECTION
SCR AND TRIP CKT
BATTERY FEED
RING R2 SW4 SW2 RING
RING GENERATOR BATTERY
12-3074.e (F)
Figure 7. Typical RAS Application, A Version, Idle, or Talk State Shown Table 12. Truth Table INPUT 0V 5V Don't Care TSD Tip Break Switch Ring Break Switch On On 5 V/Float1 1 5 V/Float Off Off 0 V2 Off Off Ringing Return Switch Off On Off Ring Switch Off3 On4 Off5
1. Thermal shutdown mechanism is active with TSD floating or equal to 5 V. 2. Forcing TSD to ground overrides the logic input pins and forces an all OFF state. 3. Idle/Talk state. 4. Power ringing state. 5. All OFF state.
A parallel in/parallel out data latch is integrated into the L7581. Operation of the data latch is controlled by the logic level input pin LATCH. The data input to the latch is the INPUT pin of the L7581, and the output of the data latch is an internal node used for state control. When the LATCH control pin is at logic 0, the data latch is transparent and data control signals flow directly from INPUT, through the data latch to state control. Any changes in INPUT will be reflected in the state of the switches. When the LATCH control pin is at logic 1, the data latch is active--the L7581 will no longer react to changes at the INPUT control pin. The state of the switches is now latched; that is, the state of the switches will remain as they were when the LATCH input transitioned from logic 0 to logic 1. The switches will not respond to changes in INPUT as long as LATCH is held high. Note that the TSD input is not tied to the data latch. TSD is not affected by the LATCH input. TSD input will override state control via INPUT and LATCH. 12 Lucent Technologies Inc.
Data Sheet November 1999
L7581 Ringing Access Switch
Outline Diagrams
16-Pin, Plastic SOG (L7581AAE/BAE)
Note: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your design efforts, please contact your Lucent Technologies Sales Representative.
L N
B
1 PIN #1 IDENTIFIER ZONE W
H SEATING PLANE 0.10 1.27 TYP 0.51 MAX 0.28 MAX 0.61
Number of Pins (N) 16
Maximum Length (L) 10.49
Maximum Width Without Leads (B) 7.62
Maximum Width Including Leads (W) 10.64
Maximum Height Above Board (H) 2.67
5-4414r2 (C)
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L7581 Ringing Access Switch
Data Sheet November 1999
Outline Diagrams (continued)
16-Pin, Plastic DIP (L7581AC/BC)
Note: The dimensions in this outline diagram are intended for informational purposes only. For detailed schematics to assist your design efforts, please contact your Lucent Technologies Sales Representative.
L N
B
1 PIN #1 IDENTIFIER ZONE W
H SEATING PLANE 0.38 MIN 2.54 TYP 0.58 MAX
Number of Pins (N) 16
Maximum Length (L) 20.57
Maximum Width Without Leads (B) 6.48
Maximum Width Including Leads (W) 7.87
Maximum Height Above Board (H) 5.08
5-4410 (F)
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Data Sheet November 1999
L7581 Ringing Access Switch
Ordering Information
Device Part No. 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 SOG 16-Pin SOG (Tape & Reel) 16-Pin DIP 16-Pin SOG 16-Pin SOG (Tape & Reel) 16-Pin DIP Comcode 107338469 107338493 107338436 107392839 107392953 107392995
*Devices on tape and reel must be ordered in 1000-piece increments.
Lucent Technologies Inc.
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For additional information, contact your Microelectronics Group Account Manager or the following: INTERNET: http://www.lucent.com/micro E-MAIL: docmaster@micro.lucent.com N. AMERICA: Microelectronics Group, Lucent Technologies Inc., 555 Union Boulevard, Room 30L-15P-BA, Allentown, PA 18103 1-800-372-2447, FAX 610-712-4106 (In CANADA: 1-800-553-2448, FAX 610-712-4106) ASIA PACIFIC: Microelectronics Group, Lucent Technologies Singapore Pte. Ltd., 77 Science Park Drive, #03-18 Cintech III, Singapore 118256 Tel. (65) 778 8833, FAX (65) 777 7495 CHINA: Microelectronics Group, Lucent Technologies (China) Co., Ltd., A-F2, 23/F, Zao Fong Universe Building, 1800 Zhong Shan Xi Road, Shanghai 200233 P R. China Tel. (86) 21 6440 0468, ext. 316, FAX (86) 21 6440 0652 . JAPAN: Microelectronics Group, Lucent Technologies Japan Ltd., 7-18, Higashi-Gotanda 2-chome, Shinagawa-ku, Tokyo 141, Japan Tel. (81) 3 5421 1600, FAX (81) 3 5421 1700 EUROPE: Data Requests: MICROELECTRONICS GROUP DATALINE: Tel. (44) 7000 582 368, FAX (44) 1189 328 148 Technical Inquiries: GERMANY: (49) 89 95086 0 (Munich), UNITED KINGDOM: (44) 1344 865 900 (Ascot), FRANCE: (33) 1 40 83 68 00 (Paris), SWEDEN: (46) 8 594 607 00 (Stockholm), FINLAND: (358) 9 4354 2800 (Helsinki), ITALY: (39) 02 6608131 (Milan), SPAIN: (34) 1 807 1441 (Madrid)
Lucent Technologies Inc. reserves the right to make changes to the product(s) or information contained herein without notice. No liability is assumed as a result of their use or application. No rights under any patent accompany the sale of any such product(s) or information.
Copyright (c) 1999 Lucent Technologies Inc. All Rights Reserved
November 1999 DS00-050ALC (Replaces DS99-014ALC)

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