General Description
The MAX4670 is an integrated T1/E1/J1 analog protection switch for 1+1 and N+1 line-card redundancy applications. It protects two T1/E1/J1 ports by combining eight SPDT switches in a single package. The switch is optimized for high-return loss and pulse-template performance in T1/E1/J1 long-haul and short-haul applications. The part offers built-in chip-side surge protection capability for short-haul intrabuilding applications.

Features
♦ Single +3.3V Supply Voltage
♦ Quad-DPDT/Octal-SPDT Switches Support Two T1/E1/J1 Ports
♦ Low RON
♦ 0.7Ω (typ) in Transmit Path; 5Ω (typ) in Receive Path
♦ Low CON/COFF
    60pF/40pF (typ) in Transmit Path
    24pF/12pF (typ) in Receive Path
♦ Chip Surge Protection
    IEC 61000-4-5 (8µs to 20µs Surge)
    Class 2 (±1kV)
♦ -70dB (typ) Crosstalk/Off-Isolation (3MHz)
♦ Small, 32-Pin TQFN Package

Applications
    Optical Multiplexers (ADMs, M13s, etc.)
    Edge Routers
    Multiservice Switches
    Base Station Controllers (Wireless Infrastructure Equipment)
    Media Gateways (VoIP)