HC5503T

Features:

• Monolithic Integrated Device
• Controlled Supply of Battery Feed Current for Short Loops (30mA)
• Single +5V Supply
• Allows Interfacing With All Ringing Systems
• Switch Hook Detection
• Compatible With Worldwide PBX Performance Requirements
• Low Power Consumption During Standby




Application

• PBX Switches (Analog, Digital or ISDN)
• Key Telephone Systems (KTS)
• ISDN PC Plug in Modems
• ISDN Small Office / Home Office (SOHO) Terminal Adapters (TA)
• CTI (Computer Telephony Integration) Products




Pinout






Specifications

Maximum Continuous Supply Voltages
(VBAT). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -60 to 0.5V
(VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . . . -0.5 to 7V
(VCC - VBAT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75V
Relay Drive Voltage (VRD) . . . . . . . . . . .. . . . . . . . . . . -0.5 to 15V




Description

The Intersil HC5503T is a low cost Subscriber Line Interface Circuit (SLIC) that replaces the components of a discrete Transformer Analog circuit design. The monolithic integrated design provides improved performance and system reliability.

The HC5503T provides: Current limited DC feed to the subscriber loop, maintains a flat frequency response over the voice band and beyond, has self resetting thermal protection that allows conversation to continue while the fault is present, provides a TTL subscriber off hook indication even in the presence of longitudinal currents, and limits system power consumption on short loops.

The HC5503T provides balanced 2-wire transmission and has excellent longitudinal balance, while providing on hook transmission and longitudinal current rejection in both the on-hook or off-hook conditions.

The SLIC needs only one +5V supply in addition to the main battery supply for loop current and operates over a range of battery voltages (-24V to -58V). Available in 22PDIP AND 24SO packaging. The HC5503T is ideally suited as a replacement for discrete line circuits in low cost analog PABXs, small Office/Home Office products or Small Key Systems.