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*R oH V SC AV ER OM AI SIO PL LA N IA BL S NT E
TISP61521 DUAL FORWARD-CONDUCTING P-GATE THYRISTORS PROGRAMMABLE OVERVOLTAGE PROTECTORS
TISP61521 SLIC Protector
Overvoltage Protection for High Voltage Negative Rail Ringing SLICs Dual Voltage-Programmable Protectors - Supports Battery Voltages Down to -150 V - Low 3 mA max. Gate Triggering Current - High 150 mA min. Holding Current Rated for International Surge Wave Shapes
D Package (Top View)
(Tip)
K1 NC
1 2 3 4
8 7 6 5
K1 (Tip) A A (Ground) (Ground)
MD6XANB
(Gate) G (Ring) K2
K2 (Ring)
Voltage Waveshape 2/10 1.2/50 1.2/50 10/160 0.5/700 10/700 9/720 10/560 10/1000
Standard GR-1089-CORE ITU-T K.22 VDE 0878 IEC 61000-4-5 FCC Part 68 Type A I3124 ITU-T K.20, VDE 0433 IEC 61000-4-5 FCC Part 68 Type B FCC Part 68 Type A GR-1089-CORE
ITSP A 170 50 100 50 40 40 40 35 30
NC - No internal connection Terminal typical application names shown in parenthesis
Device Symbol
K1 K1
A G A
K2
K2
Terminals K1, K2 and A correspond to the alternative line designators of T, R and G or A, B and C. The negative protection voltage is controlled by the voltage, VGG, applied to the G terminal. SD6XAEB
Functional Replacements for
Device Type
Package Type
Functional Replacement
............................................ UL Recognized Components
LCP1511D, 8-pin Small-Outline TISP61521D LCP1521
How To Order
For Standard Termination Finish Order As TISP 61521DR TISP615 21D For Lead Free Termination Finish Order As TISP 61521DR-S TISP615 21D-S
Device TISP61521
Package D (8-pin Small-Outline)
Carrier Embossed Tape Reeled Tube
Description
The TISP61521 is a dual forward-conducting buffered p-gate overvoltage protector. It is designed to protect monolithic SLICs (Subscriber Line Interface Circuits) against overvoltages on the telephone line caused by lightning, a.c. power contact and induction. The TISP61521 limits voltages that exceed the SLIC supply rail voltage. The TISP61521 parameters are specified to allow equipment compliance with Bellcore GR-1089-CORE, Issue 1 and ITU-T recommendation K.20.
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
Description (continued)
The SLIC line driver section is typically powered from 0 V (ground) and a negative voltage in the region of -20 V to -150 V. The protector gate is connected to this negative supply. This references the protection (clipping) voltage to the negative supply voltage. The protection voltage will then track the negative supply voltage and the overvoltage stress on the SLIC is minimized. Positive overvoltages are clipped to ground by diode forward conduction. Negative overvoltages are initially clipped close to the SLIC negative supply rail value. If sufficient current is available from the overvoltage, then the protector will switch into a low voltage on-state condition. As the overvoltage subsides, the high holding current of TISP61521 crowbar prevents d.c. latchup. These monolithic protection devices are fabricated in ion-implanted planar vertical power structures for high reliability and in normal system operation they are virtually transparent. The TISP61521 buffered gate design reduces the loading on the SLIC supply during overvoltages caused by power cross and induction. The TISP61521 is available in an 8-pin plastic small-outline surface mount package.
Absolute Maximum Ratings, TJ = 25 C (Unless Otherwise Noted)
Rating Repetitive peak off-state voltage, VGK = 0, -40 C TJ 85 C (see Note 1) Repetitive peak gate-cathode voltage, VKA = 0, -40 C TJ 85 C (see Note 1) Non-repetitive peak on-state pulse current (see Note 2) 2/10 s (GR-1089-CORE, 2/10 s voltage waveshape) 1/20 s (K.22, VDE0878, 1.2/50 voltage waveshape) 8/20 s (IEC 61000-4-5, combination wave generator, 1.2/50 voltage, 8/20 current) 10/160 s (F CC Part 68, 10/160 s voltage waveshape) 0.2/310 s (I3124, 0.5/700 s voltage waveshape) 5/310 s (VDE 0433, 10/700 s voltage waveshape) 5/310 s (I TU-T K.20/21, K.44 10/700 s voltage wave shape) 5/320 s (F CC Part 68, 9/720 s voltage waveshape) 10/560 s (F CC Part 68, 10/560 s voltage waveshape) 10/1000 s (GR-1089-CORE, 10/1000 s voltage waveshape) Non-repetitive peak on-state current, 50 Hz (see Notes 2 and 3) 0.01 s 1s Non-repetitive peak gate current, 10 ms half-sine wave, cathodes commoned (see Notes 1 and 2) Junction temperature Storage temperature range IGSM TJ Tstg ITSM 15 5 +2 -40 to +150 -65 to +150 A C C A ITSP 170 50 100 50 40 40 40 40 35 30 A Symbol VDRM VGKRM Value -175 -162 Unit V V
NOTES: 1. These voltage ratings are set by the -150 V maximum supply voltage plus the 12 V diode overshoot (VGKRM) and the 25 V SCR overshoot (V DRM). 2. Initially, the protector must be in thermal equilibrium. The surge may be repeated after the device returns to its initial conditions. The rated current values may be applied either to the Ring to Ground or to the Tip to Ground terminal pairs. Additionally, both terminal pairs may have their rated current values applied simultaneously (in this case, the Ground terminal current will be twice the rated current value of an individual terminal pair). 3. Values for VGG = -48 V. For values at other voltages, see Figure 2.
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
Recommended Operating Conditions
Component C1 Gate decoupling capacitor series resistor for GR-1089-CORE, 2/10, 10/360 and 10/1000 first-level surge survival series resistor for GR-1089-CORE, 2/10, 10/360 and 10/1000 first-level and 2/10 second-level surge survival series resistor for K.20, K.21 and K.45 coordination with a 400 V primary protector series resistor for K.44 4 kV 10/700 surge survival series resistor for FCC Part 68 Type A 10/160 and 10/560 surge survival RS series resistor for FCC Part 68 Type B 9/720 surge survival series resistor for VDE 0433 2 kV 10/700 surge survival series resistor for VDE 0878 2 kV 1.2/50 surge survival series resistor for IEC 6100-4-5 4 kV, 10/700, class 5, long distance balanced circuits surge survival with a 400 V primary protector series resistor for IEC 6100-4-5 1.2/50-8/20 combination generator, classes 0 to 5 (500 V to 4 kV maximum), short distance balanced circuits surge survival. Min 100 25 40 10 60 20 0 10 0 10 0 Typ 220 Max Unit nF

Electrical Characteristics, TJ = 25 C (Unless Otherwise Noted)
Parameter ID Off-state current V D = VDRM , VGK = 0 VGG = -48 V, CG = 220 nF 10/700, I TM = -30 A, R S = 10 1.2/50, I TM = -30 A, R S = 10 2/10, I TM = -38 A, R S = 62 , I F = 5 A, tw = 500 s 10/700, I F = 30 A, RS = 10 1.2/50, I F = 30 A, RS = 10 2/10, I F = 38 A, RS = 62 , I T = -1 A, di/dt = 1A/ms, V GG = -100 V VGG = VGK = VGKRM, VKA = 0 I T = -3 A, t p(g) 20 s, VGG = -100 V IT = -3 A, t p(g) 20 s, VGG = -100 V f = 1 MHz, V d = 1 V, IG = 0, (see Note 4) VD = -3 V VD = -48 V TJ = 25 C TJ = 85 C -150 -5 -50 3.0 2.0 100 50 Test Conditions TJ = 25 C TJ = 85 C Min Typ Max -5 -50 7 10 25 2 5 7 12 Unit A A
VGK(BO)
Gate-cathode impulse breakover voltage Forward voltage Peak forward recovery voltage Holding current Gate reverse current Gate trigger current Gate-cathode trigger voltage Cathode-anode offstate capacitance
V
VF VFRM IH IGKS IGT VGT CKA
V V mA A A mA V pF pF
NOTE 4: These capacitance measurements employ a three terminal capacitance bridge incorporating a guard circuit. The unmeasured device terminals are a.c. connected to the guard terminal of the bridge.
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
Thermal Characteristics
Parameter RJA Junction to free air thermal resistance Test Conditions TA = 25 C, EIA/JESD51-3 PCB, EIA /JESD512 environment, PTOT = 1.7 W Min Typ Max 170 Unit C/W
Parameter Measurement Information
+i IFSP (= |
TSP|)
Quadrant I Forward Conduction Characteristic
IFSM (= |ITSM|) IF VF V GK(BO) V GG VD ID I I(BO) IS IH VT IT ITSM Quadrant III Switching Characteristic ITSP -i
PM6XAAA
-v
+v
V(BO)
VS
Figure 1. Voltage-Current Characteristic Unless Otherwise Noted, All Voltages are Referenced to the Anode
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
Thermal Information
PEAK NON-RECURRING AC vs CURRENT DURATION
20 ITSM -- Peak Non-Recurrent 50 Hz Current -- A 15 10 8 7 6 5 4 3 2 1.5 1 0.8 0.7 0.6 0.5 0.01
TI61AF
RING AND TIP TERMINALS: Equal ITSM values applied simultaneously GROUND TERMINAL: Current twice I TSM value EIA / JEDSD51 Environment and PCB, T A = 25 C VGG = -80 V VGG = -60 V
VGG = -100 V VGG = -120 V 0.1 1 10 100 t -- Current Duration -- s 1000
Figure 2. Non-Repetitive Peak On-State Current against Duration
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
APPLICATIONS INFORMATION
Gated Protectors
This section covers three topics. First, it is explained why gated protectors are needed. Second, the voltage limiting action of the protector is described. Third, an example application circuit is described. Purpose of Gated Protectors Fixed voltage thyristor overvoltage protectors have been used since the early 1980s to protect monolithic SLICs (Subscriber Line Interface Circuits) against overvoltages on the telephone line caused by lightning, a.c. power contact and induction. As the SLIC was usually powered from a fixed voltage negative supply rail, the limiting voltage of the protector could also be a fixed value. The TISP1072F3 is a typical example of a fixed voltage SLIC protector. SLICs have become more sophisticated. To minimize power consumption, some designs automatically adjust the driver supply voltage to a value that is just sufficient to drive the required line current. For short lines, the supply voltage would be set low, but for long lines, a higher supply voltage would be generated to drive sufficient line current. The optimum protection for this type of SLIC would be given by a protection voltage which tracks the SLIC supply voltage. This can be achieved by connecting the protection thyristor gate to the SLIC VBATH supply, Figure 3. This gated (programmable) protection arrangement minimizes the voltage stress on the SLIC, no matter what value of supply voltage.
SLIC PROTECTOR
SLIC
SLIC PROTECTOR
SLIC
IK
Th5 TISP 61521 C1 220 nF IG V BAT
IF
Th5 TISP 61521 C1 220 nF V BAT
AI6XABA
AI6XACA
Figure 3. Negative Overvoltage Condition
Figure 4. Positive Overvoltage Condition
Operation of Gated Protectors Figure 3 and Figure 4 show how the TISP61521 limits negative and positive overvoltages. Positive overvoltages (Figure 4) are clipped by the antiparallel diode of Th5 and the resulting current is diverted to ground. Negative overvoltages (Figure 3) are initially clipped close to the SLIC negative supply rail value (VBATH). If sufficient current is available from the overvoltage, then Th5 will switch into a low voltage on-state condition. As the overvoltage subsides, the high holding current of Th5 prevents d.c. latchup. The protection voltage will be the sum of the gate supply (VBATH) and the peak gate-cathode voltage (V GK(BO)). The protection voltage will be increased if there is a long connection between the gate decoupling capacitor, C1, and the gate terminal. During the initial rise of a fast impulse, the gate current (IG) is the same as the cathode current (IK). Rates of 70 A/s can cause inductive voltages of 0.7 V in 2.5 cm of printed wiring track. To minimize this inductive voltage increase of protection voltage, the length of the capacitor to gate terminal tracking should be minimized. Inductive voltages in the protector cathode wiring will also increase the protection voltage. These voltages can be minimized by routing the SLIC connection through the protector as shown in Figure 6. Figure 5, which has a 10 A/s rate of impulse current rise, shows a positive gate charge (QGS) of about 0.1 C. With the 0.1 F gate decoupling capacitor used, the increase in gate supply is about 1 V (= Q GS/C1). This change is just visible on the -72 V gate voltage, VBATH. But the voltage increase does not directly add to the protection voltage, as the supply voltage change reaches a maximum at 0.4 s, when the gate current reverses polarity, and the protection voltage peaks earlier at 0.3 s. In Figure 5, the peak clamping voltage (V(BO)) is -77.5 V, an increase of 5.5 V on the nominal gate supply voltage. This 5.5 V increase is the sum of the supply rail increase at that time, (0.5 V), and the protection circuit's cathode diode to supply rail breakover voltage (5 V). In practice, use of the recommended 220 nF gate decoupling capacitor would give a supply rail increase of about 0.3 V and a V(BO) value of about -77.3 V.
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
0
-20 Voltage - V VK VBATH
-40
-60
-80 0.0 0.5 Time - s
AI6XD E
1.0
1.5
1 0 Current - A -1 -2 -3 -4 -5
QGS
IG
0.0
0.5 Time - s
-A
IK
1.0
1.5
Figure 5. Protector Fast Impulse Clamping and Switching Waveforms
Application Circuit Figure 6 shows a typical TISP61521 SLIC card protection circuit. The incoming line conductors, Ring (R) and Tip (T), connect to the relay matrix via the series overcurrent protection. Fusible resistors, fuses and positive temperature coefficient (PTC) resistors can be used for overcurrent protection. Resistors will reduce the prospective current from the surge generator for both the TISP61521 and the ring/test protector. The TISP7xxxF3 protector has the same protection voltage for any terminal pair. This protector is used when the ring generator configuration may be ground or battery-backed. For dedicated ground-backed ringing generators, the TISP3xxxF3 gives better protection as its inter-conductor protection voltage is twice the conductor to ground value. Relay contacts 3a and 3b connect the line conductors to the SLIC via the TISP61521 protector. The protector gate reference voltage comes from the SLIC negative supply (VBATH). A 220 nF gate capacitor sources the high gate current pulses caused by fast rising impulses.
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
OVERCURRENT PROTECTION TIP WIRE RSA
RING/TEST PROTECTION Th1
TEST RELAY
RING RELAY
SLIC RELAY S3a
SLIC PROTECTOR Th4
SLIC
S1a Th3
S2a
RING WIRE
RSB
Th2 TISP 3xxxF3 OR 7xxxF3 S3b S1b S2b
Th5 TISP 61521 C1 220 n F V BAT
TEST EQUIPMENT
RING GENERATOR
AI6XAA B
Figure 6. Typical Application Circuit
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
MECHANICAL DATA
Device Symbolization Code
Devices will be coded as follows:
Device TISP61521
Symbolization Code 61521
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
MECHANICAL DATA
D008 Plastic Small-outline Package
This small-outline package consists of a circuit mounted on a lead frame and encapsulated within a plastic compound. The compound will withstand soldering temperature with no deformation, and circuit performance characteristics will remain stable when operated in high humidity conditions. Leads require no additional cleaning or processing when used in soldered assembly.
D008
4.80 - 5.00 (0.189 - 0.197)
8-pin Small Outline Microelectronic Standard Package MS-012, JEDEC Publication 95
8
7
6
5
5.80 - 6.20 (0.228 - 0.244)
INDEX
3.81 - 4.00 (0.150 - 0.157)
1
2
3
4
1.35 - 1.75 (0.053 - 0.069)
7 NOM 3 Places
0.25 - 0.50 x 45 N0M (0.010 - 0.020)
4.60 - 5.21 (0.181 - 0.205)
0.102 - 0.203 (0.004 - 0.008) 0.28 - 0.79 (0.011 - 0.031)
0.36 - 0.51 (0.014 - 0.020) 8 Places Pin Spacing 1.27 (0.050) (see Note A) 6 places 0.190 - 0.229 (0.0075 - 0.0090)
7 NOM 4 Places
44
0.51 - 1.12 (0.020 - 0.044)
DIMENSIONS ARE:
MILLIMETERS (INCHES)
NOTES: A. B. C. D.
Leads are within 0.25 (0.010) radius of true position at maximum material condition. Body dimensions do not include mold flash or protrusion. Mold flash or protrusion shall not exceed 0.15 (0.006). Lead tips to be planar within 0.051 (0.002).
MDXX AAC
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.
TISP61521 SLIC Protector
MECHANICAL DATA
D008 Tape DImensions
D008 Package (8-pin Small Outline) Single-Sprocket Tape
3.90 - 4.10 (.154 - .161)
1.50 - 1.60 (.059 - .063)
7.90 - 8.10 (.311 - .319)
1.95 - 2.05 (.077 - .081) 0.8 MIN. (0.03)
0.40 (0.016)
5.40 - 5.60 (.213 - .220)
11.70 - 12.30 (.461 - .484)
6.30 - 6.50 (.248 - .256)
o
1.50 MIN. (.059)
0 MIN.
Cover Tape
Carrier Tape Embossment
Direction of Feed
2.0 - 2.2 (.079 - .087)
DIMENSIONS ARE:
MILLIMETERS (INCHES)
NOTES: A. Taped devices are supplied on a reel of the following dimensions:Reel diameter: Reel hub diameter: Reel axial hole:
330 +0.0/-4.0 (12.992 +0.0/-.157) 100 2.0 (3.937 .079) 13.0 0.2 (.512 .008)
MDXXATB
B. 2500 devices are on a reel.
"TISP" is a trademark of Bourns, Ltd., a Bourns Company, and is Registered in U.S. Patent and Trademark Office. "Bourns" is a registered trademark of Bourns, Inc. in the U.S. and other countries.
APRIL 2001 REVISED FEBRUARY 2005 Specifications are subject to change without notice. Customers should verify actual device performance in their specific applications.

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