First eSATA redriver with cable detection

First eSATA redriver with cable detection

Maxim introduces the MAX4951AE dual-channel buffer designed to re-drive SATA I and SATA II signals. The device maintains the integrity of the received signal by reconstructing the full output level and reduces the overall system jitter (TJ) through signal shaping. The device can re-drive the signals of the transmit and receive channels, supporting SATA I and SATA II data rates (up to 3.0Gbps). The MAX4951AE is designed for applications such as notebook computers, where signals need to meet the SATA v3.0 specification when transmitted through docking connectors, middle boards, and external connectors. The device is also ideal for applications such as desktop computers and servers that need to transmit signals over long cables and circuit boards and need to compensate for PCB and eSATA connector losses.

The MAX4951AE supports SATA out-of-band (OOB) signaling by high-speed amplitude detection at the input and corresponding amplitude suppression at the output. Input signals of 50mVP-P or less are detected as off and not passed through the device output; signals of 200mVP-P or greater are detected as on and passed through the device output. This approach effectively prevents the system from responding to unwanted noise while allowing OOB signals to pass through the MAX4951AE.

The MAX4951AE is the industry's only eSATA/SATA redriver that can enter a low-power standby mode when the integrated cable-detect pin is pulled high or left floating. This feature significantly reduces supply current and saves energy in mobile devices such as notebooks and netbooks.

The MAX4951AE features ±8kV ESD (HBM) protection on all pins to prevent damage to the device and the eSATA port. The device operates from a single 3.3V supply and is fully specified over the 0°C to +70°C commercial temperature range. The device is available in an ultra-small 4mm x 4mm, 20-pin TQFN package that is backwards compatible with the MAX4951.