The MAX4888/MAX4889 are high-speed passive switches that route PCI Express® (PCIe) data between two possible destinations. The MAX4888 is a quad single-pole/double-throw (4 x SPDT) switch ideally suited for switching two half lanes of PCIe data between two destinations. The MAX4889 is an octal single-pole/double-throw (8 x SPDT) switch ideal for switching four half lanes of PCIe data between four destinations. The MAX4888/MAX4889 feature a single digital control input (SEL) to switch signal paths. The MAX4888/MAX4889 are fully specified to operate from a single 3.0V to 3.6V power supply and also operate down to +1.65V. The MAX4888 is available in a 3.5mm x 5.5mm, 28-pin TQFN package. The MAX4889 is available in a 3.5mm x 9.0mm, 42-pin TQFN package. Both devices operate over the -40°C to +85°C temperature range.
The MAX4888 and MAX4889 are high‑speed passive switches that route PCI Express® (PCIe) data between two possible destinations. The MAX4888 provides a 4 × SPDT (quad) configuration for switching two half‑lanes, while the MAX4889 offers an 8 × SPDT (octal) configuration for four half‑lanes. Both devices use a single digital control input (SEL) to select the signal path and are fully specified for operation from a single 1.65 V to 3.6 V supply.
Key features include low on‑resistance (≈0.1 Ω), fast turn‑on/off times (≈90 ns), propagation delay around 50 ps, and operation over a temperature range of –40 °C to +85 °C. The devices are supplied in thin‑QFN packages (28‑pin 3.5 × 5.5 mm for MAX4888, 42‑pin 3.5 × 9.0 mm for MAX4889) and are intended for desktop computers, servers, storage area networks, and laptops.
| Maximum Data Rate | 2.5 Gbps PCI Express |
|---|---|
| Supply Voltage Range | 1.65 V to 3.6 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package (MAX4888) | 28‑pin TQFN 3.5 mm × 5.5 mm |
| Package (MAX4889) | 42‑pin TQFN 3.5 mm × 9.0 mm |
| Input Logic High Threshold (V IH) | 1.4 V |
| Input Logic Low Threshold (V IL) | 0.5 V |
| Quiescent Current (MAX4889) | 120 µA |
Both devices operate from a single 1.65 V up to 3.6 V supply voltage.
They are specified for a maximum data rate of 2.5 Gbps PCI Express (Gen I).