MAX4888A/MAX4889A are 5.0Gbps PCI Express passive switches from Maxim Integrated. Both switches are controlled by a single digital control input (SEL). MAX4888A is a quad single-pole/double-throw (4 x SPDT) switch ideally suited for switching two half lanes of PCIe data between two destinations. MAX4889A is an octal single-pole/double-throw (8 x SPDT) switch ideal for switching four half lanes of PCIe data between four destinations. MAX4888A/MAX4889A are fully specified to operate from a single +3.0V to +3.6V power supply††. MAX4888A is available in a 3.5mm x 5.5mm, 28-pin TQFN package. MAX4889A 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 MAX4888A and MAX4889A are high‑speed passive switches that route PCI Express (PCIe) data between two possible destinations. The MAX4888A provides a 4 × SPDT configuration for two half‑lanes, while the MAX4889A offers an 8 × SPDT configuration for four half‑lanes. Both devices use a single digital control input (SEL) and operate from a +3.0 V to +3.6 V supply.
Key specifications include operation over –40 °C to +85 °C, a data rate of up to 5.0 Gbps, low on‑resistance (≈0.1 Ω), and ESD protection of ±6 kV. The devices are supplied in 28‑pin (MAX4888A) and 42‑pin (MAX4889A) TQFN‑EP packages and are intended for applications such as PCIe lane re‑allocation in graphics cards and servers.
| Power‑supply voltage range | +3.0 V to +3.6 V |
|---|---|
| Operating temperature range | -40 °C to +85 °C |
| Maximum data rate | 5.0 Gbps PCI Express |
| MAX4888A package | 28‑pin TQFN (3.5 mm × 5.5 mm) |
| MAX4889A package | 42‑pin TQFN (3.5 mm × 9.0 mm) |
| Typical supply current (MAX4889A) | 120 µA |
Both devices operate from a single +3.0 V to +3.6 V power supply.
They support up to 5.0 Gbps PCI Express data rates.
MAX4888A comes in a 28‑pin TQFN (3.5 mm × 5.5 mm) and MAX4889A in a 42‑pin TQFN (3.5 mm × 9.0 mm).