Am79533I

The Am79533I is a kind of subscriber line interface circuit.

There are some distinctive characteristics as follows of Am79533I: (1)programmable constant current feed; (2)programmable loop detect threshold; (3)performs polarity reversal; (4)tip open state for ground start lines; (5)line feed characteristics independent of battery variations; (6)on-chip switching regulator for low power dissipation; (7)two-wire impedance set by single external impedance; (8)on-hook transmission.

The following is about the absolute maximum ratings of Am79533I: (1)storage temperature: -55 to +150; (2)ambient temperature, operating: 0 to +70; (3)VCC with respect to AGND/DGND: -0.4 to +7 V; (4)VEE with respect to AGND/DGND: +0.4 to -7 V; (5)VBAT with respect to AGND/DGND: +0.4 to -70 V; (6)AGND/DGND with respect to BGND: +1 to -3 V; (7)current from A (TIP) to B (RING): ±150 mA; (8)voltage on RINGOUT: VBAT to VCC; (9)voltage on TESTOUT: VBAT to VCC; (10)current through relay drivers or internal driver catch diodes: 60 mA; (11)voltage on ring trip inputs DA and DB: VBAT to 0 V; (12)peak current into regulator switch (L pin): 150 mA; (13)switcher transient peak off voltage on L pin: +1.0 V; (14)maximum power dissipation, TA=70: 1.5 W for ceramic DIP package and 1.0 W for plastic DIP package.