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PDF ISL5571A Data sheet ( Hoja de datos )
| Número de pieza | ISL5571A | |
| Descripción | Access High Voltage Switch | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
January 2004
ISL5571A
FN4920.4
Access High Voltage Switch
The ISL5571A is a solid state device designed to replace the
electromechanical relay used on Subscriber Line Cards. The
device contains two Line Break MOSFET switches, one Ring
Return MOSFET switch and one Ring Access SCR switch.
The ISL5571A is pin-for-pin compatible with the Lucent
L7581AAE LCAS and Clare CPCL7581A Products.
Improvements include: line break switches rON match (0.5Ω
Max) higher dV/dt sensitivity (5000V/µs), protection SCR
hold current set to 110mA.
The line break MOSFETs have very low on resistance
(<16.0Ω Typ) and Ron match (<0.05Ω Typ, 0.5Ω Max) and a
blocking voltage >330V. The Ring Return MOSFET has a
typical Ron of 50Ω and a blocking voltage >330V. The
Ringing Access switch is implemented with a SCR device
with a blocking voltage >480V. The SCR switch inherently
offers low EMI connect and disconnect circuitry. All control
I/Os use TTL thresholds making the device compatible with
3V logic.
The ISL5571A also includes on-chip protection in the form of
an over-voltage clamping circuit, current-limited MOSFET
switches, and thermal shutdown circuitry. The over-voltage
clamping circuit consists of a diode bridge and SCR.
Ordering Information
PART
NUMBER
ISL5571AIB
PROT
SCR
Yes
TEMP
RANGE
(oC)
PACKAGE PKG. DWG.
TYPE
#
-40 to 85 16 Ld SOIC M16.3
Pinout
ISL5571A
TOP VIEW
FGND 1
TBAT 2
TLINE 3
NC 4
NC 5
TRING 6
VDD 7
TSD 8
16 VBAT
15 RBAT
14 RLINE
13 NC
12 RRING
11 LATCH
10 INPUT
9 DGND
Features
• Small Size/Surface-Mount Packaging
• Low Impulse Noise, Low EMI
• Clean, Bounce-Free Switching
• Line Break Switches
- 0.5Ω Max rON Match
- 28Ω Max rON
• Built-In Current Limiting, Thermal Shutdown and
Secondary Protection for the SLIC
• Optimized for Short Loop High REN Applications
• 3V/5V Logic-Capable I/O
Applications
• Central Office
• PBX
• DLC
• HFC
• FITL
• DAML
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
• Technical Brief TB379 “Thermal Characterization of
Packages for ICs”
• Texas Instruments TISPL758LF3D Data Sheet
• Teccor Electronics Document DO-214AA
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2004. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL5571A
PARAMETER
Digital Input Characteristics:
Input Low Voltage
Input High Voltage
Input Leakage Current (High)
Input Leakage Current (Low)
TABLE 4. LOGIC I/O ELECTRICAL CHARACTERISTICS - ISL5571A
TEST CONDITION
MEASURE
MIN
-
-
VDD = 5.5V, VBAT = -75V, VLOGIC-IN = 5V
VDD = 5.5V, VBAT = -75V, VLOGIC-IN = 0V
-
-
ILOGIC-IN
ILOGIC-IN
-
2.4
-
-
TYP MAX UNITS
- 0.8 V
- -V
- 1 µA
- 1 µA
TABLE 5. LOGIC I/O POWER REQUIREMENTS - ISL5571A
PARAMETER
TEST CONDITION
MEASURE MIN TYP MAX
Power Requirements:
Power Dissipation
VDD Current
VBAT Current
Temp. Shutdown Requirements (Note 9)
Shutdown Activation Temperature
Shutdown Circuit Hysteresis
VDD = 5.5V, VBAT = -48V,
Idle/Talk State
All OFF-State
Ringing State
VDD = 5.5V,
Idle/Talk State
All OFF-State
Ringing State
VBAT = -48V,
Idle/Talk State
All OFF-State
Ringing State
IDD, IBAT
IDD, IBAT
IDD
IDD
IDD
IDD
IBAT
IBAT
IBAT
TJ
- 6.6 8.5
- 8.8 11.5
- 11.0 18.2
- 1.2 2.0
- 1.6 2.1
- 2.0 3.3
- 1.0 10
- 1.0 10
- 1.0 10
115 125 135
7 14 21
NOTE:
9. The Temperature Shutdown logic pin (TSD) will be high during normal operation and low during temperature shutdown state.
UNITS
mW
mW
mW
mA
mA
mA
µA
µA
µA
oC
oC
TABLE 6. ELECTRICAL SPECIFICATION - PROTECTION CIRCUITRY - ISL5571A
PARAMETER
TEST CONDITION
MEASURE
MIN TYP
PARAMETERS RELATED TO DIODES
Voltage Drop at Continuous
Current (50Hz/60Hz)
Apply ±DC Current Limit of Break Switches
Forward Voltage
-
-
Voltage Drop at Surge Current Apply ±Dynamic Current Limit of Break Switches Forward Voltage
-
5
PARAMETERS RELATED TO PROTECTION SCR
Surge Current
Twice ±Dynamic Current Limit of Break Switches
--
Gate Trigger Current
Hold Current
-VBAT Current
- 50
110 -
Gate Trigger Voltage
Reverse Leakage Current
ON-state Voltage (Note 10)
Trigger Current
VBAT
0.5A, t = 0.5µs
2.0A, t = 0.5µs
VBAT - 4V
-
-
-
-
-
-3
-5
NOTES:
10. In some instances, the typical ON-state voltage can range as low as -25V.
MAX UNITS
3V
-V
4
-
VBAT - 2V
1.0
-
-
A
mA
mA
V
µA
V
V
VDD
VBAT
SUPPLY
TABLE 7. POWER SUPPLY SPECIFICATIONS
MIN TYP MAX
4.5 - 5.5
-19 - -72
UNITS
V
V
5
5 Page 
ISL5571A
with the integrated secondary protection, features offered by
the ISL5571A, the application circuit will pass the AC power-
cross and lightning immunity tests of the following regulatory
requirements:
• GR 1089-CORE
• ITU-T K.20
This section will discuss the issues that must be considered
when designing an external protection circuit for use with the
ISL5571A.
The external protection circuitry should be designed to limit
the peak voltages on the TLine and RLine terminals of the
ISL5571A. The most potentially stressful condition concerning
the ISL5571A is low level power-cross when the ISL5571A
switches are closed. Under this condition, the external
protection circuitry limits the voltage and corresponding power
dissipation until the ISL5571A thermal shutdown circuitry
opens the switches.
The external protector chosen for the TLine terminal
must limit at a maximum of 130V thereby limiting the
power stress on the Ring Return switch (SW3).
The protector chosen for the RLine terminal must limit at a
maximum of 220V thereby limiting the power stress on the
Line Break switch (SW2). The 220V break-over voltage of the
protector on RLine is large enough to not interfere with the AC
ring signal during ringing.
Texas Instruments and Teccor Electronics have designed
specific parts to protect solid state line card access switches.
The following protectors are recommended:
Texas Instruments Part Number TISPL758LF3D(TLine
and RLine)
Teccor Electronics Part Number P1200SC (TLine) and
P2000SC (RLine)
Refer to the above company’s data sheets for information on
their parts and reference designs for protection of solid state
line card access switches, see Related Literature section on
Page One.
Break-Before-Make Operation
The ISL5571A device inherently has a Break-before-Make
condition between the following switches:
a. Between the Line Break switch SW1 and the Ring
Return switch SW3 during the transition from the Idle
state to the Power Ringing state.
b. Between the Line Break switch SW2 and the Ring
Access switch SW4 during the transition from the
Idle state to the Power Ringing state.
Make-Before-Break Operation
The ISL5571A device could exhibit a Make-before-Break
condition between the Line Break switch SW2 and the Ring
Access switch SW4 during the transition from the Power
Ringing state to the Idle / Talk state. There is a period of time
that can be as much as 25ms (1/2 cycle of the 20Hz ring
signal) when both SW2 and SW4 will both be on (closed).
This occurs because SW4 is an SCR and requires a zero
current crossing to turn off.
Protection SRC Latch-Up
In the Make-before-Break condition, when transiting from the
Power Ringing state to the Idle/ Talk state, during the negative
cycle of the ring generator it is possible for enough current to
flow that the protection SCR will turn on. This will result in
shorting the ring generator and the Ring terminal of the SLIC
to ground. When either SW2 or SW4 turns off, the Ring
terminal of the SLIC will remain shorted to ground unless the
output current limit of the SLIC is less than the holding current
(110mA) of the protection SCR. The current limit of most
SLICs are set well below the 110mA minimum holding current
of the ISL5571A protection SCR and therefore should not be a
concern. Another method to prevent latch-up of the protection
SCR would be to strobe the TSD pin of the ISL5571A. as
discussed in Break-Before-Make section.
Ring Access Switch Quiescent Current During
Ringing
The Ring Access switch (SW4) is a silicon control rectifier
type switch (SCR). During power ringing, the Ring Access
switch will draw a nominal 2mA of current from the ring
generator. This current is called IRING QUIESCENT and is
equal to:
IRING QUIESCENT = IRING GEN - IRING LOAD.
System designers need to ensure that this additional current
can be provided by the ring generator.
Glossary of Acronyms
AC = Alternating Current
BIMOS = Bipolar Metal-Oxide Semiconductor
CO = Central Office
CODEC = CODer-DECoder
DC = Direct Current
DLC = Digital Loop Carrier
DAML = Digitally Added Main Line
EMI = Electromagnetic Interference
ESD = Electrostatic Discharge
FITL = Fiber in the Loop
HFC = Hybrid Fiber Coax
ICs = Integrated Circuits
LCAS = Line Card Access Switch
PBX = Private Branch Exchange
REN = Ring Equivalency Number
MOSFET = Metal-Oxide Semiconductor Field-Effect Transistor
SCR = Silicon Control Rectifier
SLIC = Subscriber Line Interface Circuit
SMDs = Surface Mount Devices
SOIC = Small Outline Integrated Circuit
TSD = Thermal ShutDown
TTL = Transistor-Transistor Logic
11
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| PDF Descargar | [ Datasheet ISL5571A.PDF ] | |
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