L7583A/B/C/D Line Card Access Switch
Features
I
I
I
I
I
I
I
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 driver circuitry
Only one external protector required
The L7583A/B has seven states: the idle talk state (line
break switches closed, all other switches open), the power
ringing state (ringing access switches closed, all other
switches open), loop access state (loop access switches
closed, all switches open), SLIC test state (test in switches
closed, all other switches open), simultaneous loop and
SLIC
access state (loop and test in switches closed, all others
open), ringing generator test state (ring test switches
closed, all others open), and an all OFF state. The seven
states in the L7583A/B are also in the L7583C/D, with an
additional simultaneous test-out and ring-test state, mak-
ing the L7583C/D appropriate for digital loop carrier and
other Bellcore TR-57 applications.
The L7583 offers break-before-make or make-before-
break switching, with simple logic level input control.
Because of the solid-state construction, voltage transients
generated when switching into an inductive ringing lead
during ring cadence or ring trip are minimized, possibly
eliminating the need for external zero cross switching cir-
cuitry. State control is via logic level inputs, so no addi-
tional driver circuitry is required.
The line break switch is a linear switch that has exception-
ally 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 gen-
erator).
Incorporated into the L7583Axx and L7583Cxx 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. This is shown in Figure 1 as version A. Posi-
tive and negative lightning is reduced by the current-limit-
ing circuitry and steered to ground via diodes and the
integrated SCR. Power cross is also reduced by the cur-
rent-limiting and thermal shutdown circuits.
I
I
I
I
I
Applications
I
I
I
I
I
Central office
DLC
PBX
DAML
HFC/FITL
Description
The L7583A/B/C/D Line Card Access Switch is a mono-
lithic solid-state device providing the equivalent switching
functionality of three 2 form C switches. The L7583 is
designed to provide power ringing access, line test access
(test out), and SLIC test access (test in) 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. An addi-
tional pair of solid-state contacts are also available to pro-
vide access for testing of the ringing generator.
Document ID#
080968
Rev:
A
Distribution:
Public
Date:
Version:
Oct 31, 2002
1
L7583A/B/C/D Line Card Access Switch
Data Sheet
February 2001
The L7583 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 L7583 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 L7583, only as a refer-
ence for the integrated protection circuit. The L7583 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 and ring test switch will draw a nomi-
nal 2 mA or 4 mA from the ring generator.
The L7583A/B/C/D device is packaged in a 24-pin, plastic
DIP (L7583AF/BF/CF/DF) and in a 28-pin,
plastic SOG (L7583AAJ/BAJ/CAJ/DAJ).
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
Description
(continued)
The L7583Bxx and L7583Dxx versions provide only an
integrated diode bridge along with current limiting and ther-
mal shutdown (see Figure 2 for version B). 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.
To protect the L7583 from an overvoltage fault condition,
use of a secondary protector is required. The secondary pro-
tector 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 crowbar- type secondary protector is rec-
ommended. With proper choice of secondary protection, a
line card using the L7583 will meet all relevant ITU-T,
LSSGR, FCC, or
UL*
protection requirements.
Pin Information
F
GND
NC
NC
T
TESTin
T
BAT
T
LINE
T
RINGING
T
TESTout
NC
1
2
3
SW1
SW2
SCR
AND
TRIP
CKT
24
23
22
21
20
SW3
SW5
SW4
SW6
V
BAT
NC
NC
R
TESTin
R
BAT
R
LINE
R
RINGING
R
TESTout
LATCH
IN
TESTin
IN
RING
IN
TESTout
12-2364.a (F)
F
GND
NC
NC
NC
T
TESTin
1
2
3
4
SW1
SW2
28
27
26
25
24
23
SW3
SW5
SW6
SW7
SW8
SW9
SW10
SW4
V
BAT
NC
NC
NC
R
TESTin
R
BAT
R
LINE
NC
R
RINGING
R
TESTout
LATCH
IN
TESTin
IN
RING
IN
TESTout
12-2365.d (F)
4
5
6
7
SW7
SW8
SW10
5
6
7
8
9
10
T
BAT
T
LINE
T
RINGING
NC
T
TESTout
19
18
17
16
15
14
13
22
21
20
19
18
8
9
SW9
V
DD
10
T
SD
11
D
GND
12
NC 11
V
DD
12
T
SD
13
D
GND
14
CONTROL
LOGIC
CONTROL
LOGIC
17
16
15
Note: Shown with A/C version protection. The 24-pin DIP is available
with either A/C or B/D version protection.
Figure 1. 24-Pin, Plastic DIP (600 mil)
Note: Shown with B/D version protection. The 28-pin SOG is available
with either A/C or B/D version protection.
Figure 2. 28-Pin, Plastic SOG
2
Lucent Technologies Inc.
Data Sheet
February 2001
L7583A/B/C/D Line Card Access Switch
Pin Information
(continued)
Table 1. Pin Descriptions
DIP SOG
1
1
2
3
4
5
6
7
8
9
10
11
2
3, 4
5
6
7
8
10
9, 11
12
13
Symbol
Description
F
GND
Fault ground.
NC
NC
T
TESTin
T
BAT
T
LINE
T
RINGING
T
TESTout
NC
V
DD
T
SD
No connection.
No connection.
Test (in) access on TIP.
Connect to TIP on SLIC side.
Connect to TIP on line side.
Connect to return ground for ringing
generator.
Test (out) access on TIP.
No connection.
5 V supply.
Temperature shutdown pin. Can be
used as a logic level input or an out-
put. See Tables 16 and 17, Truth
Tables, and the Switching Behavior
section of this data sheet for input pin
description. As an output flag, will
read 5 V when the device is in its
operational mode and 0 V in the ther-
mal shutdown mode. To disable the
thermal shutdown mechanism, tie this
pin to
5 V (not recommended).
Digital ground.
DIP
24
23
22
21
20
19
18
17
16
15
14
SOG
28
27, 26
25, 21
24
23
22
20
19
18
17
16
Symbol
V
BAT
NC
NC
R
TESTin
R
BAT
R
LINE
R
RINGING
R
TESTout
LATCH
IN
TESTin
IN
RING
Description
Battery voltage. Used as a refer-
ence for protection circuit.
No connection.
No connection.
Test (in) access on RING.
Connect to RING on SLIC side.
Connect to RING on line side.
Connect to ringing generator.
Test (out) access on RING.
Data input control, active-high,
transparent low.
Logic level switch input control.
Logic level switch input control.
12
14
D
GND
13
15
IN
TESTout
Logic level switch input control.
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute stress rat-
ings 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
Parameter
Operating Temperature Range
Storage Temperature Range
Relative Humidity Range
Pin Soldering Temperature (t = 10 s max)
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
260
7
–85
7
330
330
Unit
°C
°C
%
°C
V
V
V
V
V
3
Handling Precautions
L7583A/B/C/D Line Card Access Switch
Data Sheet
February 2001
Although protection circuitry has been designed into this device, proper precautions should be taken to avoid exposure to elec-
trostatic discharge (ESD) during handling and mounting. Legerity employs a human-body model (HBM) and a charged-device
model (CDM) for ESD-susceptibility 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
Ω,
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
L7583
Rating
1000 V
Electrical Characteristics
T
A
= –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
V
DD
Min
4.5
Typ
5
Max
5.5
Unit
V
Supply
V
BAT
*
Min
–19
Typ
—
Max
–72
Unit
V
* V
BAT
is used only as a reference for internal protection circuitry. If V
BAT
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. Test In Switches, 1 and 2
Parameter
OFF-state Leakage Current:
+25 °C
+85 °C
–40 °C
ON-resistance:
+25 °C
+85 °C
–40 °C
Isolation:
+25 °C
+85 °C
–40 °C
dV/dt Sensitivity*
Test Condition
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 (on) = ±5 mA, ±10 mA
Iswitch (on) = ±5 mA, ±10 mA
Iswitch (on) = ±5 mA, ±10 mA
Vswitch (both poles) = ±320 V,
Logic inputs = Gnd
Vswitch (both poles) = ±330 V,
Logic inputs = Gnd
Vswitch (both poles) = ±310 V,
Logic inputs = Gnd
—
Measure
Iswitch
Iswitch
Iswitch
Min Typ Max
—
—
—
—
—
—
1
1
1
Unit
µA
µA
µA
∆
V
ON
∆
V
ON
∆
V
ON
Iswitch
Iswitch
Iswitch
—
—
—
—
—
—
—
—
45
—
33
—
—
—
200
—
70
—
1
1
1
—
Ω
Ω
Ω
µA
µA
µA
V/µs
* Applied voltage is 100 Vp-p square wave at 100 Hz.
4
Data Sheet
February 2001
L7583A/B/C/D Line Card Access Switch
Electrical Characteristics
(continued)
Table 6. Break Switches, 3 and 4
Parameter
OFF-state Leakage
Current:
+25 °C
+85 °C
–40 °C
ON-resistance:
+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 µs)
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
T
LINE
= ±10 mA, ±40 mA, T
BAT
= –2 V
T
LINE
= ±10 mA, ±40 mA, T
BAT
= –2 V
T
LINE
= ±10 mA, ±40 mA, T
BAT
= –2 V
Per ON-resistance test
condition of SW3, SW4
Iswitch = I
LIMIT
@ 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 µs
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
—
Iswitch
Iswitch
Iswitch
—
—
—
—
—
—
1
1
1
µA
µA
µA
∆
V
ON
∆
V
ON
∆
V
ON
Magnitude
R
ON
SW3 – R
ON
SW4
V
ON
Iswitch
Iswitch
Iswitch
—
—
—
—
—
80
—
—
19.5
—
14.5
0.2
—
—
—
2.5
—
28
—
1.0
220
—
250
—
Ω
Ω
Ω
Ω
V
mA
mA
A
Isolation:
+25 °C
+85 °C
–40 °C
dV/dt Sensitivity
†
Iswitch
Iswitch
Iswitch
—
—
—
—
—
—
—
—
200
1
1
1
—
µA
µA
µA
V/µs
* 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.
5
京公网安备 11010802033920号
EEWORLD
