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ATTL7554P-TR Datasheet(PDF) 6 Page - Agere Systems |
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ATTL7554P-TR Datasheet(HTML) 6 Page - Agere Systems |
6 / 28 page 6 Lucent Technologies Inc. Data Sheet March 1997 L7554 Low-Power SLIC 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 abso- lute 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 connection chatters, and 2) inductance in the VBAT lead could resonate with the VBAT filter capacitor to cause a destructive overvoltage. B0 B1 B2 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. 1 1 0 Powerup, Reverse Battery. Normal talk and battery feed state. Pin PR is positive with respect to PT. On-hook transmission is enabled. 0 1 1 Ground Start. Tip drive amplifier is turned off. The device presents a high-impedance (>100 k Ω) to the PT pin and a current-limited battery to the PR pin. Output pin RGDET indicates current flow- ing in the ring lead. 0 1 0 Low-Power Scan, Reverse Battery. Except for off-hook supervision, all circuits are shut down to conserve power. Pin PR is positive with respect to PT. On-hook transmission is disabled. 0 0 1 Low-Power Scan, Forward Battery. Except for off-hook supervision, all circuits are shut down to conserve power. Pin PT is positive with respect to PR. On-hook transmission is disabled. 0 0 0 Disconnect. The Tip and Ring amplifiers are turned off and the SLIC goes to a high-impedance state (>100 k Ω). 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 VBAT –75 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 (VBAT – 5) to +3 V PT or PR Fault Voltage (10 x 1000 µs) VPT, VPR (VBAT – 15) to +15 V Current into Ring Trip Inputs IRTSP, IRTSN ±240 µA |
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