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ATTL7583AAJ-D Datasheet(PDF) 10 Page - Agere Systems |
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ATTL7583AAJ-D Datasheet(HTML) 10 Page - Agere Systems |
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10 / 20 page  10 10 Lucent Technologies Inc. Data Sheet February 2001 L7583A/B/C/D Line Card Access Switch Switching Behavior When switching from the power ringing state to the idle/talk state, via simple logic level input control, the L7583 is able to provide control with respect to the tim- ing when the ringing access contacts are released rela- tive to the state of the line break contacts. Make-before-break operation occurs when the line break switch contacts are closed (or made) before the ringing access switch contact is opened (or broken). Break-before-make operation occurs when the ringing access contact is opened before the line break switch contacts are closed. Using the logic level input pins RING, TESTin, and TESTout, either make-before-break or break-before- make operation of the L7583 is easily achieved. The logic sequences for either mode of operation are given in Table 13 and Table 14. See the Truth Tables (Table 16 and Table 17) for an explanation of logic states. When using an L758X in the make-before-break mode, during the ring-to-idle transition, for a period of up to one-half the ringing frequency, the ring break switch and the pnpn-type ring access switch can both be in the ON state. This is the maximum time after the logic signal at INRING has transitioned that the ring access switch is waiting for the next zero current cross, so it can close. During this interval, current that is limited to the dc break switch current-limit value will be source from the ring node of the SLIC. This current is presented to the internal protection cir- cuit. If the SCR-type protector is used (A or C codes), if by random probability the ring-to-idle transition occurs during a portion of the ring cycle when the ringing volt- age exceeds the protection circuit SCR turn-on volt- age, and if current in excess of the SCR’s turn-on current is also available, the SCR may turn on. Once the SCR is triggered on, if the SLIC is capable of sup- plying current in excess of the holding current, the SCR may be latched on by the SLIC. The probability of this event depends on the character- istics of the given SLIC and of the holding current of the L7583 A or C device. The SCR hold current distribution is designed to be safely away from the test limit of 80 mA. The higher the distribution, the lower the proba- bility of the latch. If this situation is of concern for a given board design, either use the A or C series device in the break-before- make mode (eliminates the original 25 ms current pulse) or use a B or D series device (eliminates the SCR). Table 13. Make-Before-Break Operation RING TESTin TESTout TSD State Timing Break Switches 3 & 4 Ring Return Switch 7 Ring Access Switch 8 All Other Access Switches 5 V 0 V 0 V Float Power Ringing — Open Closed Closed Open 0 V 0 V 0 V Float Make- before- break SW8 waiting for next zero current crossing to turn off maximum time—one-half of ringing. In this transi- tion state, current that is limited to the dc break switch cur- rent-limit value will be sourced from the ring node of the SLIC. Closed Open Closed Open 0 V 0 V 0 V Float Idle/Talk Zero cross current has occurred. Closed Open Open Open |
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