MAX4950

Quad PCI Express Equalizer/Redriver

Ultra-Small Equalizer/Redriver Improves PCIe Signal Integrity Across Systems

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Overview

Single +3.3V Supply Operation
Generation I (2.5GT/s) and Generation II (5.0GT/s) Capable
Return Loss:
- ≥ 10dB (f ≤ 1.25GHz)
- ≥ 8dB (f ≤ 2.5GHz)
Very Low Latency
- 280ps Propagation Delay
Individual Lane Detection
Low Lane-to-Lane Skew: ±50ps
Total Jitter ≤ 35ps_P-P at BER = 10^-12
Three-Level-Programmable Input Equalization
Three-Level-Programmable Output Deemphasis
On-Chip 50Ω Input/Output Terminations
±2kV Human Body Model (HBM) Protection on All Pins
Space-Saving, 3.5mm x 9.0mm, TQFN Packaging

The MAX4950 PCI Express (PCIe®) quad equalizer/redriver operates from a single +3.3V supply. This device improves signal integrity at the receiver through programmable input equalization and programmable redrive circuitry. The output circuitry reestablishes deemphasis lost on the board, compensating for circuit board loss. This device permits optimal placement of key PCIe components and longer runs of stripline, microstrip, or cable.

The MAX4950 contains four identical buffers capable of equalizing differential signals at data rates up to 5GT/s, and features electrical idle and receiver detection on each channel. The MAX4950 is ideal for use with PCIe Gen I (2.5GT/s) and Gen II (5.0GT/s) data rates and features a power-saving mode.

The MAX4950 is available in a small, lead-free, 42-pin (3.5mm x 9.0mm) TQFN package for optimal layout and minimal space requirements. The board traces are flow-through for ease of layout. The MAX4950 is specified over the 0°C to +70°C operating temperature range.

Applications