Clare, Inc., a wholly owned subsidiary of IXYS Corp., has
introduced the CPC7514Z Quad High-Voltage Isolated Analog Switch Array
for use in industrial controls, instrumentation, automatic test
equipment and telecom applications. The CPC7514Z IC features four
independently controlled, 320 V bidirectional normally open (1-Form-A)
relays actuated by latched TTL logic-level control signals.
The monolithic silicon, which features high voltage DMOS structures and
low voltage CMOS circuitry, is biased by a 3.3 V power supply
eliminating the requirement for external high-voltage supplies for
proper operation. Switch-output to logic-input isolation is ±320 V.
Designed to provide flexible single-ended or differential access to high
voltage networks, the CPC7514Z may also be configured as two sets of
matched pair switches for improved differential performance. The switch
pairs have an on-resistance matching specification of 0.8 Ohm maximum
over the industrial temperature range of -40 to +85ºC.
The individual switches have active current limiting protection for
fault events which limits the low frequency currents to 200 mA. Under
serious high power fault conditions, which may raise the IC junction
temperature, a thermal shutdown protection feature is provided. Between
the initial current-limit and the thermal-shutdown events, a secondary,
low-level, current-limit mode is provided to limit the power dissipation
of the switches. Protection continues until the fault is removed.
These products are fabricated using Clare's High Voltage SOI process
which has been used for many years in central office telecom equipment
requiring long operational life. In addition to telecom, the CPC7514Z
may be used as four normally open relays in automatic test equipment
(ATE), industrial controls, and battery monitoring/charging equipment
and instrumentation applications. The device may also interface directly
with 110 V(RMS) AC in switch applications replacing banks of
electromechanical relays (EMR) and driver circuitry for enhanced system
integration. Many applications will benefit from the elimination of a
costly DC/DC converter block that is generally incorporated to bias the