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CPC7582
12 www.clare.com Rev. 3.0 10/4/2002
2.3 Data Latch
The CPC7582 has an integrated data latch. The latch
operation is controlled by logic-le vel input pin 11
(LATCH). The data input of the latch is pin 10
(INRINGING) and pin 9 (I NTEST) of the device while the
output of the data latch is an internal node used for
state control. When LATCH cont rol pin is at logic 0,
the data latch is tr ansparent and da ta control sign als
flow directly through to state control. A change in input
will be reflected in the switch state. When LATCH
control pin is at logic 1, the dat a latch is active and a
change in input control will not aff ect switch state. The
switches will remain in the position they w er e in when
the LATCH changed from logic 0 to logic 1 and will not
respond to changes in input as long as the lat ch is at
logic 1. The TSD input is not tied to t he dat a latch.
Theref ore , TSD is not aff ected b y the LATCH input and
the TSD input will o verride state control.
2.4 TSD
Setting TSD to +5 V allows switch contr ol using t he
logic inputs. This setting, however, also disables the
thermal shutdown circuit and is therefore not recom-
mended. When using logic cont rols via the input pins,
pin 7 (TSD) should be allowed to float. As a result , the
two recommended states when using pin 7 (TSD) as a
control are 0, which forces the device to the all-off
state, or f loat, which allows logic inputs to remain
active. This requires the use of an open-collector type
buffer.
2.5 Ringing Switc h Zer o-Cr oss Current Turn Off
After the application of a logic input t o turn SW4 off,
the ringing switch is designed to delay the change in
state until the next zero-crossing. Once on, the switch
requires a zero-current cross to tu rn off, and therefore
should not be used to switch a pure DC signal. The
switch will remain in the on state no matter the logic
input until the next zero crossing. These switching
characteristics will reduce and possib ly eliminate
ov erall system impulse noise normally associated with
ringing swit ches . See application note AN-144,
Impulse Noise Benefits of Line Card Access Switches. The
attributes of ringing switch SW4 ma y make it possible
to eliminate the need f or a zero-cross switching
scheme. A minim um impedance of 300 Ω in series
with the ringing generator is recommended.
2.6 Power Suppli es
Both a +5 V supply and battery v oltage are connected
to the CPC7582. CPC7582 switch state control is
pow ered exclusively b y the +5 V supply. As a result,
the CPC7582BC e xhibits extremely low pow er
dissipation during both active and idle states.
The battery voltage is not u sed for switch control but
rather as a su pply for the integrated secondary
protection circuitry. The integrated SCR is designed to
trigger when pin 2 (TBAT) or pin 15 (RBAT) drops 2 to
4 V below the voltage on pin 16 (VBAT). This trigger
pre v ents a f ault in duced overvoltage e v ent at the T BAT
or RBAT nodes.
2.7 Battery Voltage Monito r
The CPC7582 also uses the VBAT voltage to monitor
battery v oltage. If battery voltage is lost, the CPC7582
immediately enters the all-off st ate. It remains in this
state until the battery voltage is rest ored. The device
also enters the all-off state if t he bat tery volt age rises
above –10 V and remains in the all-off st ate unt il the
battery v oltag e drops belo w –15 V. This batt ery
monitor f eature dr aws a small current from the battery
(less than 1 µA typical) and will add slightly t o t he
de vice’s overall power dissipation.
2.8 Protection
2.8.1 Diode Bridge/SCR
The CPC7582 uses a combination of current limited
break s witches, a diode bridge/SCR clamping circuit,
and a thermal shutdown mechanism to protect the
SLIC device or other associated circuitry from damage
during line transient e v ents such as lightning. During a
positive transient condition, the fault current is
conducted through the diod e bridge to g r ound via
FGND. Voltage is clamped to a diod e drop abo ve
ground. During a negative tr ansient of 2 to 4 V more
negative than the volta ge at VBAT, the SCR conducts
and f aults are shunted to FGND via the SCR or the
diode bridge.
In order f or the SCR to crowbar or f oldback, the on
v olt age (see “Protection Circuitry Electrical
Specifications” on page 8) of the SCR must be less
negative than the VBAT v oltage. If the VBAT voltage is
less negativ e than the SCR on voltage or if the VBAT
supply is unab le to source the trigger current, the SCR
will not crowbar.
F or po w er induction or po w er-cross fault conditions,
the positive cycle of the transient is clamped to the
diode drop abov e ground and the f ault current directed
to ground. The negative cycle of the transient will
cause the SCR to conduct when the voltage e xceeds