Data Sheet
February 2001
L7583A/B/C/D Line Card Access Switch
Features
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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
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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, making the L7583C/D appro-
priate 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, volt-
age 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 circuitry. State control
is via logic level inputs, so no additional driver cir-
cuitry is required.
The line break switch is a linear switch that has
exceptionally 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 protec-
tion, to prevent breakdown in the presence of a tran-
sient fault condition (i.e., passing the transient on to
the ringing generator).
Incorporated into the L7583Axx and L7583Cxx is a
diode bridge/SCR clamping circuit, current-limiting
circuitry, and a thermal shutdown mechanism to pro-
vide protection to the SLIC device and subsequent
circuitry during fault conditions. This is shown in Fig-
ure 1 as version A. Positive and negative lightning is
reduced by the current-limiting circuitry and steered
to ground via diodes and the integrated SCR. Power
cross is also reduced by the current-limiting and ther-
mal shutdown circuits.
Applications
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Central office
DLC
PBX
DAML
HFC/FITL
Description
The L7583A/B/C/D Line Card Access Switch is a
monolithic 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 ana-
log line card applications. An additional pair of solid-
state contacts are also available to provide access
for testing of the ringing generator.
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 dissipa-
tion 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
reference 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 nominal 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
thermal shutdown (see Figure 2 for version B). This will
cause positive faults to be directed to ground and neg-
ative 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 condi-
tion, use of a secondary protector is required. The sec-
ondary protector 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 recommended. 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 V
BAT
23 NC
22 NC
21 R
TESTin
F
GND
NC
NC
NC
T
TESTin
1
2
3
4
SW1
SW2
28 V
BAT
27 NC
26 NC
25 NC
24 R
TESTin
23 R
BAT
SW3
SW5
SW6
SW7
SW4
4
5
6
7
SW7
SW8
SW10
SW3
SW5
SW4
SW6
5
6
7
8
9
SW8
SW9
SW10
20 R
BAT
19 R
LINE
18 R
RINGING
17 R
TESTout
16 LATCH
15 IN
TESTin
CONTROL
LOGIC
T
BAT
T
LINE
T
RINGING
NC
22 R
LINE
21 NC
20 R
RINGING
19 R
TESTout
18 LATCH
8
9
SW9
T
TESTout
10
NC 11
V
DD
12
T
SD
13
V
DD
10
T
SD
11
D
GND
12
14 IN
RING
13 IN
TESTout
CONTROL
LOGIC
17 IN
TESTin
16 IN
RING
15 IN
TESTout
12-2365.d (F)
D
GND
14
12-2364.a (F)
Note: Shown with A/C version protection. The 24-pin DIP is avail-
able with either A/C or B/D version protection.
Note: Shown with B/D version protection. The 28-pin SOG is avail-
able with either A/C or B/D version protection.
Figure 1. 24-Pin, Plastic DIP (600 mil)
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 Symbol
Description
1
1
F
GND
Fault ground.
2
3
4
5
6
7
8
9
10
11
2
3, 4
5
6
7
8
NC
NC
T
TESTin
T
BAT
T
LINE
T
RINGING
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 ring-
ing generator.
Test (out) access on TIP.
No connection.
DIP
24
23
22
21
20
19
18
17
16
SOG
28
27, 26
25, 21
24
23
22
20
19
18
17
16
Symbol
Description
V
BAT
Battery voltage. Used as a ref-
erence for protection circuit.
NC
No connection.
NC
No connection.
R
TESTin
Test (in) access on RING.
R
BAT
Connect to RING on SLIC
side.
R
LINE
Connect to RING on line side.
R
RINGING
Connect to ringing generator.
R
TESTout
Test (out) access on RING.
LATCH Data input control, active-high,
transparent low.
IN
TESTin
Logic level switch input control.
IN
RING
Logic level switch input control.
10
T
TESTout
9, 11
NC
12
13
V
DD
T
SD
12
14
D
GND
5 V supply.
15
14
Temperature shutdown pin. Can
be used as a logic level input or an
output. 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 thermal shutdown
mode. To disable the thermal shut-
down mechanism, tie this pin to
5 V (not recommended).
Digital ground.
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 abso-
lute stress ratings 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
Lucent Technologies Inc.
Min
–40
–40
5
—
—
—
—
—
—
Max
110
150
95
260
7
–85
7
330
330
Unit
°C
°C
%
°C
V
V
V
V
V
3
L7583A/B/C/D Line Card Access Switch
Data Sheet
February 2001
Handling Precautions
Although protection circuitry has been designed into this device, proper precautions should be taken to avoid expo-
sure to electrostatic discharge (ESD) during handling and mounting. Lucent Technologies Microelectronics Group
employs a human-body model (HBM) and a charged-device model (CDM) for ESD-susceptibility testing and pro-
tection 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 thresh-
old 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 test-
ing 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
Lucent Technologies Inc.
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 second-
ary 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
R
ON
∆
V
ON
∆
V
ON
∆
V
ON
Magnitude
SW3 – R
ON
SW4
V
ON
Iswitch
Iswitch
Iswitch
—
—
—
—
—
80
—
—
19.5 —
—
28
14.5 —
0.2 1.0
—
—
—
2.5
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.
Lucent Technologies Inc.
5
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