Description
The L7581 Ringing Access Switch is a monolithic solid-state device that provides the switching functionality of a 2 form C switch.
The L7581 is designed to provide power ringing access to tip and ring in central office, digital loop carrier, private branch exchange, digitally added main line, and hybrid fiber coax/fiber-in-the-loop analog line card applications. The L7581 has three states: the idle talk state (line break switches closed, ringing access switches open), the power ringing state (line break switches open, ringing access switches closed), and an all OFF state.

FEATUREs
■ Small size/surface-mount packaging
■ Monolithic IC reliability
■ Low impulse noise
■ Make-before-break, break-before-make operation
■ Clean, bounce-free switching
■ Low, matched ON-resistance
■ Built-in current limiting, thermal shutdown, and SLIC protection
■ 5 V only operation, very low power consumption
■ Battery monitor, all OFF state upon loss of battery
■ No EMI
■ Latched logic level inputs, no drive circuitry
■ Only one external protector required

APPLICATIONs
■ Central office
■ DLC
■ PBX
■ DAML
■ HFC/FITL