L3234 Datasheet | STMicroelectronics

L3234 L3235 HIGHLY INTEGRATED SLIC KIT TARGETED TO PABX AND KEY SYSTEM APPLICATIONS HIGHLY INTEGRATED SUBSCRIBER LINE INTERFACE KIT FOR PABX AND KEY SYSTEM APPLICATIONS IMPLEMENTS ALL KEY ELEMENTS OF THE BORSCHT FUNCTION INTEGRATED ZERO CROSSING BALANCED RINGING INJECTION ELIMINATES EXTERNAL RELAY AND CENTRALISED RINGING GENERATOR ZERO NOISE INJECTED ON ADJACENT LINES DURING RINGING SEQUENCE LOW POWER IN STANDBY AND ACTIVE MODES BATTERY FEED WITH PROGRAMMABLE LIMITING CURRENT PARALLEL LATCHED DIGITAL INTERFACE SIGNALLING FUNCTIONS (OFF HOOK, GND-KEY) LOW NUMBER OF EXTERNAL PONENTS INTEGRATED THERMAL PROTECTION INTEGRATED OVER CURRENT PROTECTION 0°C TO 70°C: L3234/L3235 -40°C TO 85°C: L3234T/L3235T HEPTAWATT ORDERING NUMBER: L3234 PLCC28 ORDERING NUMBER: L3235 DESCRIPTION The L3234/L3235 is a highly integrated SLIC KIT targeted to PABX and key system applications The kit integrates the majority of functions required to interface a telephone line. The L3234/L3235 implements the main Features of the broths function: - Battery Feed (Balanced Mode) - Ringing Injection - Signalling Detection - Hybrid Function The Kit prises 2 devices, the L3234 ringing injector fabricated in Bipolar in 140V Technology. Its function is to amplify and inject in balanced mode with zero crossing the ringing signal. The device requires an external positive supply of 100V and a low level sinusoid of approx. 950m Vrms. The L3235 Line Feeder is integrated in 60V Bipolar Technology. The L3235 provides battery feed to the line with programmable current limitation. The two to four wire voice frequency signal conversion is implemented by the L3235 and line terminating and balance impedances are externally programmable. The L3234/L3235 kit is designed for low power dissipation. In a short loop condition the extra power is dissipated on an external transistor. The Kit is controlled by five wire parallel bus and interfaces easily to all first and programmable second generation BOS. (see...