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ATTL7557AAU Datasheet(PDF) 6 Page - Agere Systems |
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ATTL7557AAU Datasheet(HTML) 6 Page - Agere Systems |
6 / 28 page 6 Lucent Technologies Inc. Data Sheet January 2000 with Battery Switch L7556, L7557 Low-Power SLICs Functional Description Table 2. Input State Coding Table 3. Supervision Coding Absolute Maximum Ratings (TA = 25 °C) Stresses in excess of the Absolute Maximum Ratings can cause permanent damage to the device. These are absolute stress ratings only. Functional operation of the device is not implied at these or any other conditions in excess of those given in the operational sections of the data sheet. Exposure to Absolute Maximum Ratings for extended periods can adversely affect device reliability. Note: The IC can be damaged unless all ground connections are applied before, and removed after, all other connections. Furthermore, when powering the device, the user must guarantee that no external potential creates a voltage on any pin of the device that exceeds the device ratings. Some of the known examples of conditions that cause such potentials during powerup are the following: 1. An inductor connected to tip and ring can force an overvoltage on VBAT through the protection devices if the VBAT connections chatter. 2. Inductance in the VBAT leads could resonate with the VBAT filter capacitors to cause a destructive overvoltage. B0 B1 BS State/Definition 1 1 1 Powerup, Forward Battery. Normal talk and battery feed state. Pin PT is positive with respect to PR. On-hook transmission is enabled. VBAT1 is applied to entire circuit. 1 1 0 Powerup, Forward Battery. Normal talk and battery feed state. Pin PT is positive with respect to PR. On-hook transmission is enabled. For the L7556 only, VBAT2 is applied to tip/ring drive amplifiers. For the L7557 only, the device compares the magnitude of VBAT2 to the voltage necessary to maintain proper loop current. Then the device automatically applies VBAT2 to tip/ring drive am- plifiers when possible, not affecting the desired dc template. 1 0 1 2-Wire Wink. Pins PT and PR are put at the same potential (near ground). VBAT1 is applied to entire circuit. 0 0 1 Disconnect. The tip and ring amplifiers are turned off, and the SLIC goes to a high-impedance state (>100 k Ω).VBAT1 is applied to entire circuit. Pin NLC Pin NRDET Pin RGDET 0 = off-hook 1 = on-hook 0 = ring trip 1 = no ring trip 1 = ring ground 0 = no ring ground Parameter Symbol Value Unit 5 V Power Supply VCC 7.0 V Battery (Talking) Supply VBAT1 –63 V Auxiliary Battery Supply VBAT2 –63 V Logic Input Voltage — –0.5 to +7.0 V Analog Input Voltage — –7.0 to +7.0 V Maximum Junction Temperature TJ 165 °C Storage Temperature Range Tstg –40 to +125 °C Relative Humidity Range RH 5 to 95 % Ground Potential Difference (BGND to AGND) — ±3 V PT or PR Fault Voltage (dc) VPT, VPR (VBAT1 – 5) to +3 V PT or PR Fault Voltage (10 x 1000 µs) VPT, VPR (VBAT1 – 15) to +15 V Current into Ring Trip Inputs IRTSP, IRTSN ±240 µA |
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