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CPC7581
Line Card Access Switch
Features * Small 16 pin surface mount SOIC package * Monolithic IC reliability * Low matched RDSON * Eliminates the need for zero cross switching * Flexible switch timing to transition from ringing mode to idle/talk mode * Clean, bounce free switching * Tertiary Protection consisting of integrated current limiting, thermal shutdown and SLIC protection * 5V operation with power consumption <10mW * Intelligent battery monitor * Latched logic level inputs, no drive circuitry * Pin to pin compatible to the Lucent 7581 family Applications * Central office (CO) * Digital Loop Carrier (DLC) * PBX Systems * Digitally Added Main Line (DAML) * Hybrid Fiber Coax (HFC) * Fiber in the Loop (FITL) * Pair Gain System * Channel Banks
Description The CPC7581 is a monolithic solid state switch in a 16 pin surface mount SOIC package. It provides the necessary functions to replace a 2-Form-C electromechanical relay on analog line cards found in Central Office, Access and PBX equipment. The device contains solid state switches for tip and ring line break and ring injection/ring return. The CPC7581 requires only a +5V supply and offers "break-before-make" or "make-before-break" switch operation using simple logic level input control. There are two versions of the CPC7581, the CPC7581BA and the CPC7581BB. The "BA" version has a protection SCR which provides protection to the SLIC device and subsequent circuitry during fault conditions.
Ordering Information Part # CPC7581BA CPC7581BB CPC7581BA-TR CPC7581BB-TR Description 4 Pole with protection SCR 4 Pole without protection SCR Tape & Reel Version Tape & Reel Version
Block Diagram
TRING (6) VBAT Reference (16)
TIP
R1
TLINE
(3)
SW3 Ringing Return SW1 Break
TBAT (2)
Secondary Protection
SCR and Trip Circuit
SLIC
RBAT (15)
Ring
R2
RLINE
(14) SW4 Ringing Access SW2 Break
CPC7581BA
Ring Generator RRING (12)
+
Battery
DS-CPC7581-R2
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1
CPC7581
Absolute Maximum Ratings (@ 25 C)
Parameter Operating Temperature Range Storage Temperature Range Relative Humidity Range Pin Soldering Temperature (t=10 s max) +5V Power Supply Battery Supply Logic Input Voltage Logic Input to Switch Output Isolation Switch Isolation (SW1, SW2, SW3) Switch Isolation (SW4) Min -40 -40 5 Max +110 +150 95 +260 7 -85 7 330 330 480 Units C C % C V V V V V V
Absolute Maximum Ratings are stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this data sheet is not implied. Exposure of the device to the absolute maximum ratings for extended period may degrade the device and effect its reliability.
Electrical Characteristics TA = -40oC to +85oC (unless otherwise specified) Minimum and maximum values are production testing requirements. Typical values are characteristic of the device and are the result of engineering evaluations. Typical values are provided for information purposes only. Power Supply Specifications
Supply VDD VBAT1
1
Min +4.5 -19
Typ +5.0 -
Max +5.5 -72
Unit V V
ESD Rating (HBM) 1000V
VBAT is used only as a reference for internal protection circuitry.
If VBAT rises above -10V, the device will enter an all off state and will remain in the all off state until the battery voltage drops below -15V.
Table 1. Break Switch, SW1 and SW2
PARAMETERS CONDITIONS Off-state Leakage Current: +25C Vsw (differential)= -320V to Gnd Vsw (differential)= -60V to +260V +85C Vsw (differential)= -330V to Gnd Vsw (differential)= -60V to +270V -40C Vsw (differential)= -310V to Gnd Vsw (differential)= -60V to +250V RDSON (SW1,SW2): +25C TLINE= +/-10 mA, +/-40mA, TBAT= -2V +85C TLINE= +/-10 mA, +/-40mA, TBAT= -2V -40C TLINE= +/-10 mA, +/-40mA, TBAT= -2V RDSON Match Per ON-resistance Test Condition of SW1, SW2 dc Current Limit: +25C Vsw (on) = +/- 10V +85C Vsw (on) = +/- 10V -40C Vsw (on) = +/- 10V Dynamic Current Limit: Break switches in ON state, Ringing (t=<0.5s) access switches OFF, Apply +/- 1000V at 10/1000s pulse, Appropriate secondary protection in place. Logic Input to Switch Output Isolation +25C Vsw (TLINE, RLINE) = +/-320V Logic Inputs = Gnd +85C Vsw (TLINE, RLINE) = +/-330V Logic Inputs = Gnd -40C Vsw (TLINE, RLINE) = +/-310V Logic Inputs = Gnd dv/dt Sensitivity1 1
SYMBOL Isw Isw Isw
MIN -
TYP 0.1 0.3 0.1
MAX 1 1 1
UNITS A A A
V V V Magnitude RON SW1-RONSW2 Isw Isw Isw Isw
80 -
14.5 20.5 10.5 0.15 300 160 400 2.5
28 0.8 425 -
mA mA mA A
Isw Isw Isw -
-
0.1 0.3 0.1 200
1 1 1 -
A A A V/s
Rev. 2
Applied voltage is 100 Vp-p square wave at 100Hz.
2
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CPC7581
Table 2. Ring Return Switch, SW3
PARAMETERS Off-state Leakage Current +25C +85C -40C dc Current Limit: +25C +85C -40C Dynamic Current Limit: (t=<0.5s) CONDITIONS Vsw (differential)= -320V to Gnd Vsw (differential)= -60V to +260V Vsw (differential)= -330V to Gnd Vsw (differential)= -60V to +270V Vsw (differential)= -310V to Gnd Vsw (differential)= -60V to +250V Vsw (on) = +/- 10V Vsw (on) = +/- 10V Vsw (on) = +/- 10V Break switches in ON state, Ringing access switches OFF, Apply +/- 1000V at 10/1000ms pulse, Appropriate secondary protection in place. SYMBOL Isw Isw Isw MIN TYP 0.1 0.3 0.1 MAX 1 1 1 UNITS A A A
Isw Isw Isw Isw
-
135 85 210 2.5
-
mA mA mA A
RDSON +25C Isw (on) = +/-0mA, +/-10mA +85C Isw (on) = +/-0mA, +/-10mA -40C Isw (on) = +/-0mA, +/-10mA Logic Input to Switch Output Isolation +25C Vsw (TRING, TLINE) = +/-320V Logic Inputs = Gnd +85C Vsw (TRING, TLINE) = +/-330V Logic Inputs = Gnd -40C Vsw (TRING, TLINE) = +/-310V Logic Inputs = Gnd
V V V Isw Isw Isw
-
60 85 45 0.1 0.3 0.1
100 1 1 1
A A A
Table 3. Ringing Access Switch, SW4
PARAMETERS Off-state Leakage Current +25C +85C -40C CONDITIONS Vsw (differential)= -255V to +210V Vsw (differential)= +255V to -210V Vsw (differential)= -270V to +210V Vsw (differential)= +270V to -210V Vsw (differential)= -245V to +210V Vsw (differential)= +245V to -210V Isw (on) = +/- 1mA Vcc = 5V, INaccess = 0 SYMBOL Isw Isw Isw IR V Isw Isw Isw MIN TYP .05 0.1 .05 1.5 0.1 300 8.5 .05 0.1 .05 MAX 1 1 1 3 0.25 2 12 1 1 1 UNITS A A A V mA A A A A A
ON Voltage Ring Generator Current During Ring Surge Current Release Current RDSON Isw (on) = +/-70mA, +/-80mA Logic Input to Switch Output Isolation +25C Vsw (RRING, RLINE) = +/-320V Logic Inputs = Gnd +85C Vsw (RRING, RLINE) = +/-330V Logic Inputs = Gnd -40C Vsw (RRING, RLINE) = +/-310V Logic Inputs = Gnd
Rev. 2
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3
CPC7581
Table 4. Additional Electrical Characteristics
PARAMETERS Digital Input Characteristics Input Low Voltage Input High Voltage Input Leakage Current (High) Input Leakage Current (Low) Power Requirements Power Dissipation CONDITIONS VDD = 5.5V, VBAT = -75V, Vlog = 5V VDD = 5.5V, VBAT = -75V, Vlog = 0V VDD = 5V, VBAT = -48V, Idle/Talk State or All Off State Ringing State or Access State VDD = 5V, Idle/Talk State or All Off State Ringing State or Access State VBAT = -48V, Idle/Talk State or All Off State Ringing State or Access State SYMBOL Ilog Ilog MIN 3.5 TYP 2.2 2.2 0.1 0.1 MAX 1.5 1 1 UNITS V V A A
IDD, IBAT IDD IDD IDD IBAT IBAT -
110 10
5.5 6.5 1.1 1.3 0.1 0.1 125 -
7.5 10 1.5 1.9 10 10 150 25
mW mW mA mA A A C C
VDD Current
VBAT Current
Temperature Shutdown Requirements1 Shutdown Activation Temperature Shutdown Circuit Hysteresis
1
Temperature shutdown flag (TSD) will be high during normal operation and low during temperature shutdown state.
4
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Rev. 2
CPC7581
Table 5. Make-Before-Break Operation (Ringing to Idle/Talk Transition)
Break Switches Timing 1&2 Open SW4 waiting for next zero current Closed crossing to turn off. Maximum time is 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 Zero cross current has occurred Closed Ring Return Switch 3 Closed Open Ring Access Switch 4 Closed Closed
Input 5V 0V
TSD 5V/Float 5V/Float
State Ringing Make-before-break
0V
5V/Float
Idle / Talk
Open
Open
Table 6. Break-Before-Make Operation (Ringing to Idle/Talk Transition)
Break Switches 1&2 Open Open Ring Return Switch 3 Closed Open Ring Access Switch 4 Closed Closed
Input 5V 5V
TSD 5V/Float 0V
State Ringing All Off
0V 0V
0V 5V/Float
All/Off Idle/Talk
Timing Hold this state for <=25ms. SW4 waiting for zero current to turn off. Zero current has occurred SW4 has opened Release Break Switches
Open Closed
Open Open
Open Open
Rev. 2
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CPC7581
Table 7. Electrical Specifications, Protection Circuitry
PARAMETER Parameters Related to Diodes (in Diode Bridge) Voltage Drop @ Continuous Current (50/60 Hz) Voltage Drop @ Surge Current Parameters Related to Protection SCR1 Surge Current Trigger Current (+25C) Hold Current (+25C) Trigger Current (+85C) Hold Current (+85C) Gate Trigger Voltage Reverse Leakage Current ON State Voltage1
1
CONDITIONS
SYMBOL
MIN
TYP
MAX
UNITS
Apply +/-dc current limit of break switches Apply +/-dynamic current limit of break switches
Forward Voltage Forward Voltage
-
2.1 5
3 -
V V
Trigger Current VBAT 0.5A t = 0.5 ms 2.0A t = 0.5 ms
ITRIG IHOLD ITRIG IHOLD Von -
60 VBAT - 4 -
60 100 35 70 -3 -5
* VBAT - 2 1.0 -
A mA mA mA mA V A V V
Only for the CPC7581BA. * Passes GR1089 & ITU-T K.20 with appropriate secondary protection in place.
Table 8. Truth Table
Input TSD Tip Break Switch On Off Off Ring Break Switch On Off Off Ringing Return Switch Off On Off Ring Switch Off On Off State
0V 5V Don't Care
1 2
5V/Float1 5V/Float1 0V2
Idle/Talk Ringing All Off
Thermal shutdown mechanism is active with TSD floating or equal to 5V and cannot be disabled. Forcing TSD to ground overrides the logic input pins and forces an all off state.
6
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Rev. 2
CPC7581
Package Pinout
CPC7581
FGND TBAT 1 2
SW1 SW2 SW3 SW4
SCR and TRIP CKT
Pin 16 15 14 13 12 11 10 1 VBAT RBAT RLINE NC RRING LATCH INPUT DGND 2 3 4 5 6 7 8
Name FGND TBAT TLINE NC NC TRING VDD TSD
Function Fault ground Connect to TIP on SLIC side Connect to TIP on line side No Connect No Connect Connect to return ground for ringing generator + 5V Supply Temperature shutdown pin. Can be used as a logic level input or output. See Tables 5, 6 and 8 for more details. As an output, will read +5V when device is in its operational mode and 0V in the thermal shutdown mode. Digital Ground Logic level input switch control Data latch control, active high, transparent low Connect to ringing generator No Connect Connect to RING on line side Connect to RING on SLIC side Battery voltage. Reference for protection circuit
TLINE 3 NC NC TRING VDD TSD 4 5 6 7 8
Temperature Shutdown
9
9
* Only the CPC7581BA contains the protection SCR.
DGND INPUT LATCH RRING NC RLINE RBAT VBAT
10 11 12 13 14 15 16
Rev. 2
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CPC7581
Functional Description Introduction The CPC7581 has three states: * Idle/talk state (line break switches SW1, and SW2 closed, ringing switches SW3, SW4 open) * Ringing state (line break switches SW1, and SW2 open, ringing switches SW3, SW4 closed) * All Off state (line break switches SW1, and SW2 open, ringing switches SW3, SW4 open) The CPC7581 offers break-before-make and makebefore-break switching with simple logic level input control. Solid state switch construction means no impulse noise is generated when switching during ring cadence or ring trip, thus eliminating the need for external "zero cross" switching circuitry. State control is via logic level input so no additional driver circuitry is required. The line break switches SW1 and SW2 are linear switches that have exceptionally low RDSON and excellent matching characteristics. The ringing access switch SW4 has a breakdown voltage rating of >480V which is sufficiently high, with proper protection, to prevent breakdown in the presence of a transient fault condition. Integrated into the CPC7581 is a diode bridge/SCR clamping circuit, current limiting and thermal shutdown mechanism to provide protection to the SLIC device during a fault condition. Positive and negative surges are reduced by the current limiting circuitry and steered to ground via diodes and the integrated SCR. Power cross transients are also reduced by the current limiting and thermal shutdown circuits. Please note that only the CPC7581BA has the integrated protection SCR. To protect the CPC7581 from an overvoltage fault condition, use of a secondary protector is required. The secondary protector must limit the voltage seen at the tip and ring terminals to a level below the max breakdown voltage of the switches. To minimize the stress on the solid-state contacts, use of a foldback or crowbar type secondary protector is recommended. With proper selection of the secondary protector, a line card using the CPC7581 will meet all relevant ITU, LSSGR, FCC or UL protection requirements. The CPC7581 operates from a +5V supply only. This gives the device extremely low idle and active power dissipation and allows use with virtually any range of battery voltage. A battery voltage is also used by the CPC7581 as a reference for the integrated protection circuit. In the event of a loss of battery voltage, the CPC7581 will enter an "all off" state.
Switch Timing The CPC7581 provides, when switching from the ringing state to the idle/talk state, the ability to control the timing when the ringing access switches SW3 and SW4 are released relative to the state of the line break switches SW1 and SW2 using simple logic level input. This is referred to a "make before break" or "break before make" operation. When the line break switch contacts (SW1, SW2) are closed (or made) before the ringing access switch contact (SW3, SW4) is opened (or broken), this is referred to a "make-before-break" operation. "Breakbefore-make" operation occurs when the ringing access contact (SW3, SW4) is opened (broken) before the line break switch contacts (SW1, SW2) are closed (made). With the CPC7581 the "make before break" and "break before make" operations can easily be selected by applying logic level inputs to pin 10 of the device. The logic sequences for either mode of operation are given in Tables 5 and 6. Logic states and explanations are given in Table 8. Ring Access Switch Zero Cross Current Turn Off After the application of a logic input to turn SW4 off, the ring access switch is designed to delay the change in state until the next zero crossing. Once on, the switch requires a zero current cross to turn off and therefore should not be used to switch a pure DC signal. The switch will remain in the on state no matter what logic input until the next zero crossing. For proper operation, pin 12 (RRing) should be connected using proper impedance to a ring generator or other AC source. These switching characteristics will reduce and possibly eliminate overall system impulse noise normally associated with ringing access switches. The attributes of ringing access switch SW4 may make it possible to eliminate the need for a zero cross switching scheme. A minimum impedance of 300 in series with the ring generator is recommended. Power Supplies Both a +5V supply and battery voltage are connected to the CPC7581. CPC7581 switch state control is powered exclusively by the +5V supply. As a result, the CPC7581 exhibits extremely low power dissipation during both active and idle states. The battery voltage is not used for switch control but rather as a reference by the integrated secondary protection circuitry. The integrated SCR is designed to trigger when pin 2 (TBAT) or pin 15 (RBAT) drops 2 to 4V below the battery. This trigger prevents a fault induced overvoltage event at the TBAT or RBAT nodes.
Rev. 2
8
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CPC7581
Battery Voltage Monitor The CPC7581 also uses the voltage reference to monitor battery voltage. If battery voltage is lost, the CPC7581 will immediately enter the "all off" state and remain in this state until the battery voltage is restored. The device will also enter the "all off" state if the battery voltage rises above -10V and will remain there until the battery voltage drops below -15V. This battery monitor feature draws a small current from the battery (< 1A typ.) and will add slightly to the device's overall power dissipation. Protection Diode Bridge/SCR The CPC7581 uses a combination of current limited break switches, a diode bridge/SCR clamping circuit and a thermal shutdown mechanism to protect the SLIC device or other associated circuitry from damage during line transient events such as lightning. During a positive transient condition, the fault current is conducted through the diode bridge and to ground. Voltage is clamped to the diode drop above ground. During a negative transient of two to four volts more negative than the battery, the SCR conducts and faults are shunted to ground via the SCR and diode bridge. Also, in order for the SCR to crowbar or foldback, the on voltage (see Table 7) of the SCR must be less negative than the battery reference voltage. If the battery voltage is less negative the SCR on voltage, the SCR will not crowbar, however it will conduct fault currents to ground. For power induction or power cross fault conditions, the positive cycle of the transient is clamped to the diode drop above ground and the fault current directed to ground. The negative cycle of the transient will cause the SCR to conduct when the voltage exceeds the battery reference voltage by two to four volts, steering the current to ground. Current Limiting function If a lightning strike transient occurs when the device in the talk/idle state, the current is passed along the line to the integrated protection circuitry and limited by the dynamic current limit response of break switches SW1 and SW2. When a 1000V 10x1000 pulse (LSSGR lightning) is applied to the line though a properly clamped external protector, the current seen at pins 2 (TBAT) and pin 15 (RBAT) will be a pulse with a typical magnitude and duration of 2.5A and < 0.5ms. If a power cross fault occurs with device in the talk/idle state, the current is passed though the break switches SW1 and SW2 on to the integrated protection circuit and is limited by the dynamic DC current limit response
of the two break switches. The DC current limit, specified over temperature, is between 80mA and 425mA and the circuitry has a negative temperature coefficient. As a result, if the device is subjected to extended heating due to power cross fault, the measured current at pin 2 (TBAT) and pin 15 (RBAT) will decrease as the device temperature increases. If the device temperature rises sufficiently, the temperature shutdown mechanism will activate and the device will default to the "all off" state. Temperature Shutdown The thermal shutdown mechanism will activate when the device temperature reaches a minimum of 110C placing the device in the "all off" state regardless of logic input. During this thermal shutdown mode, pin 8 (TSD) will read 0V. Normal output of TSD is +VDD If presented with a short duration transient such as a lightning event, the thermal shutdown feature will not typically activate. But in an extended power cross transient, the device temperature will rise and the thermal shutdown will activate forcing the switches to an "all off" state. At this point the current measured at pin 2 (TBAT) and pin 15 (RBAT) will drop to zero. Once the device enters thermal shutdown it will remain in the "all off" state until the temperature of the device drops below the activation level of the thermal shutdown circuit. This will return the device to the state prior to thermal shutdown. If the transient has not passed, current will flow at the value allowed by the dynamic DC current limiting of the switches and heating will begin again, reactivating the thermal shutdown mechanism. This cycle of entering and exiting the thermal shutdown mode will continue as long as the fault condition persists. If the magnitude of the fault condition is great enough, the external secondary protector could activate and shunt all current to ground. External Protection Elements The CPC7581 requires only one overvoltage secondary protector on the loop side of the device. The integrated protection feature described above negates the need for protection on the line side. The purpose of the secondary protector is to limit voltage transients to levels that do not exceed the breakdown voltage or input-output isolation barrier of the CPC7581. A foldback or crowbar type protector is recommended to minimize stresses on the device. Consult Clare's application note, AN-100, "Designing Surge and Power Fault Protection Circuits for Solid State Subscriber Line Interfaces" for equations related to the specifications of external secondary protectors, fused resistors and PTCs.
Rev. 2
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9
CPC7581
Data Latch The CPC7581 has an integrated data latch. The latch operation is controlled by logic level input pin 11 (LATCH). The data input of the latch is pin 10 (INPUT) and of the device while the output of the data latch is an internal node used for state control. When LATCH control pin is at logic 0, the data latch is transparent and data control signals flow directly through to state control. A change in input will be reflected in a change is switch state. When LATCH control pin is at logic 1, the data latch is now active and a change in input control will not affect switch state. The switches will remain in the position they were in when the LATCH changed from logic 0 to logic 1 and will not respond to changes in input as long as the latch is at logic 1. In addition, TSD input is not tied to the data latch. Therefore, TSD is not affected by the LATCH input and TSD input will override state control via pin 10 (INRING) and the LATCH.
10
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Rev. 2
CPC7581
MECHANICAL DIMENSIONS
16 Pin SOIC (JEDEC Package)
10.11 MIN / 10.31 MAX (.398 MIN / .406 MAX) 1.27 (.050)
2.44 MIN / 2.64 MAX (.096 MIN / .104 MAX) 0.51 MIN / 1.01 MAX (.020 MIN / .040 MAX)
0.23 MIN / 0.32 MAX (.0091 MIN / .0125 MAX) 7.40 MIN / 7.60 MAX (.291 MIN / .299 MAX) 10.11 MIN / 10.51 MAX (.398 MIN / .414 MAX)
0.36 MIN / 0.46 MAX (.014 MIN / .018 MAX)
PC Board Pattern (Top View)
1.270 (.050)
9.728 .051 (.383 .002) 1.193 (.047) .787 (.031)
Dimensions mm (Inches)
Rev. 2
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11
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CLARE LOCATIONS
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EUROPE
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SALES OFFICES AMERICAS
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Clare cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in this Clare product. No circuit patent licenses nor indemnity are expressed or implied. Clare reserves the right to change the specification and circuitry, without notice at any time. The products described in this document are not intended for use in medical implantation or other direct life support applications where malfunction may result in direct physical harm, injury or death to a person.
Specification: DS-CPC7581-R2 (c)Copyright 2000, Clare, Inc. All rights reserved. Printed in USA. 7/16/01

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