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CPC7592BCTR Datasheet(PDF) 11 Page - IXYS Corporation |
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CPC7592BCTR Datasheet(HTML) 11 Page - IXYS Corporation |
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11 / 19 page  INTEGRATED CIRCUITS DIVISION CPC7592 R04 www.ixysic.com 11 2. Functional Description 2.1 Introduction 2.1.1 CPC7592xA and CPC7592xB Logic States • Talk. Break switches SW1 and SW2 closed, ringing switches SW3 and SW4 open, and test switches SW5 and SW6 open. • Ringing. Break switches SW1 and SW2 open, ringing switches SW3 and SW4 closed, and test switches SW5 and SW6 open. • Test. Break switches SW1 and SW2 open, ringing switches SW3 and SW4 open, and loop test switches SW5 and SW6 closed. • All-off. Break switches SW1 and SW2 open, ringing switches SW3 and SW4 open, and test switches SW5 and SW6 open. 2.1.2 CPC7592xC Logic States • Talk. Break switches SW1 and SW2 closed, ringing switches SW3 and SW4 open, and test switches SW5 and SW6 open. • Ringing. Break switches SW1 and SW2 open, ringing switches SW3 and SW4 closed, and test switches SW5 and SW6 open. • Test/Monitor. Break switches SW1 and SW2 closed, ringing switches SW3 and SW4 open, and test switches SW5 and SW6 closed. • Ringing Test. Break switches SW1 and SW2 open, ringing switches SW3 and SW4 closed, and test switches SW5 and SW6 closed. • All-off. Break switches SW1 and SW2 open, ringing switches SW3 and SW4 open, and test switches SW5 and SW6 open. The CPC7592 offers break-before-make and make-before-break switching from the ringing state to the talk state with simple TTL level logic input control. Solid-state switch construction means no impulse noise is generated when switching during ring cadence or ring trip, eliminating the need for external zero-cross switching circuitry. State control is via TTL logic-level input so no additional driver circuitry is required. The linear break switches SW1 and SW2 have exceptionally low RON and excellent matching characteristics. The ringing switch, SW4, has a minimum open contact breakdown voltage of 465 V at +25 C 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 generator). Integrated into the CPC7592 is an over-voltage clamping circuit, active current limiting, and a thermal shutdown mechanism to provide protection for the SLIC during a fault condition. Positive and negative lightning surge currents are reduced by the current limiting circuitry and hazardous potentials are diverted away from the SLIC via the protection diode bridge or the optional integrated protection SCR. Power-cross potentials are also reduced by the current limiting and thermal shutdown circuits. To protect the CPC7592 from an over-voltage fault condition, use of a secondary protector is required. The secondary protector must limit the voltage seen at the tip and ring terminals to a level below the maximum breakdown voltage of the switches. To minimize the stress on the solid-state contacts, use of a foldback or crowbar type secondary protector is highly recommended. With proper selection of the secondary protector, a line card using the CPC7592 will meet all relevant ITU, LSSGR, TIA/EIA and IEC protection requirements. The CPC7592 operates from a single +5 V supply. This gives the device extremely low power consumption in any state with virtually any range of battery voltage. The battery voltage used by the CPC7592 has a two fold function. It is used as a reference and as a current source for the internal integrated protection circuitry under surge conditions. Second, it is used as a reference. In the event of battery voltage loss, the CPC7592 enters the all-off state. 2.2 Under Voltage Switch Lock Out Circuitry 2.2.1 Introduction Smart logic in the CPC7592 now provides for switch state control during both power up and power loss transitions. An internal detector is used to evaluate the VDD supply to determine when to de-assert the under voltage switch lock out circuitry with a rising VDD and when to assert the under voltage switch lock out circuitry with a falling VDD. Any time unsatisfactory low VDD conditions exist the lock out circuit overrides user switch control by blocking the information at the external input pins and conditioning internal switch |
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