The MAX4928A/MAX4928B are high-speed passive switches that route PCI Express (PCIe) data and/or DisplayPort signals between two possible destinations in desktop or laptop PCs. The MAX4928A is intended for use with ATX form factor desktop PCs, while the MAX4928B is expected to be used in the BTX form factor. The MAX4928A/MAX4928B are hex double-pole/double-throw (6 x DPDT) switches. They feature a single digital control input (SEL) to switch signal paths and a latch input (LE) that holds the switches in a given state. The MAX4928A/MAX4928B are fully specified to operate from a single +3.3V (typ) power supply. They are available in an industry standard 5mm x 11mm, 56-pin TQFN package. Both devices operate over the -40°C to +85°C extended temperature range.
The MAX4928A and MAX4928B are high‑speed passive switches that route PCI Express (PCIe) and DisplayPort signals between two possible destinations in desktop or laptop PCs. The MAX4928A targets ATX‑form‑factor desktops, while the MAX4928B is intended for BTX‑form‑factor systems. Both devices are hex double‑pole/double‑throw (6 × DPDT) switches with a single digital control input (SEL) and a latch enable input (LE) that holds the switch state.
These switches operate from a single +3.3 V typical supply (3.0 V to 3.6 V range) and are packaged in a 5 mm × 11 mm, 56‑pin TQFN‑EP package. They support PCIe Gen I/II and DisplayPort data rates greater than 5 Gbps, with excellent return loss (> 12 dB at 2.5 GHz) and low supply current (850 µA max). The datasheet provides absolute maximum ratings, detailed electrical characteristics, pin descriptions, and typical operating curves.
| Operating Temperature Range | -40°C to +85°C |
|---|---|
| Package Type | 56‑pin TQFN‑EP (5 mm × 11 mm) |
| Power Supply Range | 3.0 V to 3.6 V |
| Supply Current | 850 µA (typical) |
| Supported Data Rates | > 5 Gbps |
The devices operate from a single +3.3 V typical supply with a range of 3.0 V to 3.6 V.
They are housed in a 5 mm × 11 mm, 56‑pin TQFN‑EP package.
The switches are intended for use in desktop PCs (ATX) and notebook PCs (BTX).
The LE (Latch Enable) input holds the switches in a given state.