MAY 2002 - REVISED FEBRUARY 2005
Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
TISP6L7591 SLIC Protector
TISP6L7591
DUAL FORWARD-CONDUCTING P-GATE THYRISTORS
PROGRAMMABLE OVERVOLTAGE PROTECTORS
Device Symbol
Rated for Standard Lightning Wave Shapes
Rated for AC Fault Currents
How To Order
D Package (Top View)
Description
The TISP6L7591 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 TISP6L7591 limits voltages that exceed the SLIC
supply rail voltage.
The SLIC line driver section is typically powered from 0 V (ground)
and a negative voltage, V
S, in the region of -20 V to -80 V. The
protector gate is connected to this negative supply. This
references the protection (clipping) voltage to the negative supply
voltage. The negative protection voltage will then track the
negative supply voltage and the overvoltage stress on the SLIC is
minimized.
Wave Shape
Standard
IPP
A
2/10
GR-1089-CORE
±80
10/700
ITU-T K.20 & K.21 ±40
10/1000
GR-1089-CORE
±30
Gate Trigger Current ............................................... 15 mA max.
High V
S Voltage ......................................................... -80 V max.
High Holding Current ............................................. 150 mA min.
AC
Hz
Time
s
ITSM
A
50/60
0.01
±5
1
±3.5
MD6XAND
1
2
3
4
5
6
7
8
PT
GND
GND
PR
V
S
TIP
RING
NC
SD6XAEE
PT (8)
PR (5)
GND (7)
GND (6)
V
S (2)
TIP (1)
RING (4)
Pin
Symbol
Comment
Pin
Symbol
Comment
1
TIP
Line-side TIP
8
PT
Protected TIP
to SLIC
2VS
Supply voltage
to Gate
7
GND
Ground
3NC
No Internal
connection
6
GND
Ground
4
RING
Line-side RING
5
PR
Protected RING
to SLIC
Note: Pins 1 and 4 must always be connected to the protection
resistors shown in Figures 2 and 3 (Line Feed Circuitry).
The SLIC can be connected either to the protected
outputs (pins 5 and 8) or to the inputs (pins 1 and 4).
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 TISP6L7591 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 TISP6L7591 is available in 8-pin plastic small-outline surface mount package.
............................................ UL Recognized Components
*RoHS Directive 2002/95/EC Jan 27 2003 including Annex
Device
Package
Carrier
TISP6L7591 D (8-pin Small-Outline) R (Embossed Tape Reeled)
TISP6L7591DR
TISP6L7591DR-S
For Standard
Termination Finish
Order As
For Lead Free
Termination Finish
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