ISL5586

Features:

• Interfaces to Broadcom 3352 cable modem device
• Very low on-hook power consumption
- 64mW @ Vbh = 75V
• User Programmable constant current to the subscriber loop
• On Chip ring generation
- Balanced to 95 Vpk
• Sinewave, Trapezoid, DC offset
• Programmable loop start and ring trip detectors
• Loop start, Ground Start, Polarity Reversal (soft/hard)
• On-Hook transmission and pulse metering support
• Integrated battery switch
• Open circuit line voltage clamp
• Compatible with 3.3V devices
• TR-57 compliant Longitudinal balance
• 28 PLCC packaging
• Latch-up free Bipolar design
• Thermal protection




Application

• Cable Modems
• Voice Over DSL (VoDSL)
• Broadband Wireless Access
• Voice Over Internet Protocol (VoIP)
• ISDN Terminal Adapters (TA)
• Small Office Home Office PBX
• Wireless Local Loop




Pinout






Specifications

Maximum Supply Voltages
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . -0.5V to +7V
VCC - VBAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . .110V
ESD (Human Body Model). . . . . . . . . . . . . . . . . . . . . .... . . . 500V
Maximum Tip/Ring Negative Voltage Pulse (Note 7) . . . . . .VBH-15V
Maximum Tip/Ring Positive Voltage Pulse (Note 7). . . . . . . . . . + 8V

Description

The ISL5586 is a very low power Ringing Subscriber Interface circuit designed for use with the Broadcom BCM3352 Cable Modem Chip, with on-board voiceband codecs, or other 3.3V voiceband codec devices. The ISL5586 provides on board ringing signal generation up to 95V peak supporting sinusoidal or trapezoidal waveshapes with DC offset. Loop start and ground start trunks are supported, and an open circuit DC voltage of less than 56V is maintained on the subscriber loop in the on-hook condition, in compliance with MTU operation and the safety requirements of UL-1950. Together with the Broadcom BCM3352, the ISL5586 provides resistive and complex two wire impedance matching and transhybrid balancing. Also supported are onhook transmission of caller id signals, soft and hard polarity reversal and 12/16kHz subscriber pulse metering systems used in Europe and Asia, thereby allowing a low cost, low risk, global product design to be achieved.