L8560AP

The L8560AP is one member of the L8560 series.The L8560 full-feature, low-power subscriber line interface circuit (SLIC) is optimized for low power consumption while providing an extensive set of features. This part is ideal for ISDN terminal adapter applications and short-loop, power-sensitive applications such as pair gain and cable telephony.This part is also designed for PBX, DLC, or CO applications.The L8560AP includes an auxiliary battery input and a battery switch. In short-loop applications, L8560APs can be used in high battery to present a high on-hook voltage, and then switched to low battery to reduce off-hook power.

Features of the L8560AP are:(1)full-feature set for central office applications; (2)also ideal for isdn terminal adapters, pair gain, and cable telephony applications; (3)auxiliary input for second battery, and internal switch to enable its use to save power in short telephone loops; (4)5 V only operation or optional ±5 V operation for reduced power consumption; (5)low active power (85 mW typical) and scan power(61 mW typical) with 5 V only operation ; (6)low active power (68 mW typical with auxiliary battery) and scan power (45 mW typical) with ±5 V operation ; (7)quiet tip/ring polarity reversal; (8)per-line ringing available for short loops; (9)reduced overhead and increased current limit during ring mode for lower-battery operation or increased ring loop length; (10)supports meter pulse injection; (11)distortion-free full duplex from 0 ma dc loop current on-hook transmission.

The absolute maximum ratings of the L8560AP can be summarized as:(1)5V power voltage:7.0V;(2)storage temperature range:-40 to 125;(3)maximum junction temperature:165;(4)logic input voltage:-0.5 to 7.0V;(5)relative humidity range:5 to 95%.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 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.