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ATTL7582AAE Datasheet(PDF) 7 Page - Agere Systems |
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ATTL7582AAE Datasheet(HTML) 7 Page - Agere Systems |
7 / 16 page Lucent Technologies Inc. 7 Data Sheet November 1999 L7582 Tip Ring Access Switch Electrical Characteristics (continued) Table 9. Additional Electrical Characteristics * Temperature shutdown flag (TSD) will be high during normal operation and low during temperature shutdown state. Parameter Test Condition Measure Min Typ Max Unit Digital Input Characteristics: Input Low Voltage — — — — 1.5 V Input High Voltage — — 3.5 — — V Input Leakage Current (high) VDD = 5.5 V, VBAT = –75 V, Vlogicin = 5 V llogicin — — 1 µA Input Leakage Current (low) VDD = 5.5 V, VBAT = –75 V, Vlogicin = 0 V llogicin — — 1 µA Power Requirements: Power Dissipation VDD = 5 V, VBAT = –48 V, idle/talk state or all OFF state, ringing state or access state IDD, IBAT IDD — — 3 6 5 10 mW mW VDD Current VDD = 5 V, idle/talk state or all OFF state, ringing state or access state IDD IDD — — 560 0.750 900 1.9 µA mA VBAT Current VBAT = –48 V, idle/talk state or all OFF state, ringing state or access state IBAT IBAT — — 4 4 10 10 µA µA Temperature Shutdown Requirements*: Shutdown Activation Temperature — — 110 125 150 °C Shutdown Circuit Hysteresis — — 10 — 25 °C Zero Cross Current Turn Off The ring access switch (SW4) is designed to turn off on the next zero current crossing after application of the appropriate logic input control. This switch requires a current zero cross to turn off. Switch 4, once on, will remain in the ON state (regardless of logic input) until a current zero cross. Therefore, to ensure proper opera- tion of switch 4, this switch should be connected, via proper impedance, to the ringing generator or some other ac source. Do not attempt to switch pure dc with switch 4. For a detailed explanation of the operation of switch 4, please refer to the An Introduction to L758X Series of Line Card Access Switches Application Note. Switching Behavior When switching from the power ringing state to the idle/talk state via simple logic level input control, the L7582 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 (broken) before the line break switch contacts are closed (made). Using the logic level input pins INring and INaccess, either make-before-break or break-before-make opera- tion of the L7582 is easily achieved. The logic sequences for either mode of operation are given in Table 10 and Table 11. See the Truth Table (Table 13) for an explanation of the logic states. |
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