The MAX4927 from Maxim is a quad, high-speed, Gigabit-LAN switch that switches signals from two separate interface transformers and connects them to a single, 1000 Base-T Ethernet PHY. To save space and cost, the MAX4927 integrates robust ESD-protection structures that eliminate the need for external ESD diodes while meeting the following ESD-protection specifications: ±15 kV IEC 61000-4-2 Air-Gap Discharge, ±8 kV IEC 61000-4-2 Contact Discharge, and ±15 kV Human Body Model.
The IC also includes LED switches that allow LED output signals to be routed to a docking station along with Ethernet signals. Available in an industry-standard, 5 mm x 11 mm, 56-pin TQFN package, the device is ideal for upgrading the performance of applications that require LED and Ethernet signal switching, such as notebooks and docking stations.
Based on an n-channel MOSFET architecture, the MAX4927 includes an efficient, internal charge pump that features ultra-low quiescent current for power-sensitive designs. Unlike other charge-pump circuits, this device includes internal flyback capacitors that reduce design time, board space, and cost. The MAX4927's advanced architecture enables it to achieve extremely low 8,0 pF on-capacitance and 4 Ω on-resistance to meet Ethernet insertion and return-loss specifications.
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