Differential Switches Target PCI Express

Two new multiple-channel differential switching ICs, the NCN3612B and NCN3411, are available in single pole, double throw (SPDT) switch configurations for high-frequency I/O signals such as PCI Express 3.0 and DisplayPort 1.2. Target applications include notebook computers, desktop computers, servers and network storage equipment. The NCN3612B is a 6-channel differential SPDT switch that supports 8 Gbits/s data transfer rates due to its high bandwidth. It has an on-state capacitance (C_ON) of 2.1 pF (typical) and an on-state resistance (RDS_ON) of 8 Ω (typical). This is complemented by the NCN3411, which is a 4-channel differential switch also capable of supporting 8 Gbits/s data transfer rates. It has a C_ON of 2 pF (typical) and a RDS_ON of 7.5 Ω (typical). These intrinsically low C_ON and RDS_ON figures mean both faster data edge rates and lower insertion losses, allowing the delivery of signal integrity levels needed to support the latest high-speed interface standards now being specified for system designs. The NCN3612B has a power supply voltage range of 3 to 3.6 V and draws a supply current of just 250 µA (typical), while the NCN3411 has a power supply voltage range of 1.5 to 2.0 V and draws a supply current of 200 µA. They operate over an ambient temperature range of −40 to +85 °C. The NCN3612B is offered in a lead-free, 56-pin WQFN (5 mm x 11 mm x 0.75 mm) package and is priced at $1.30 per unit in 2,000-unit quantities. The NCN3411 is offered in a lead-free, 42-pin WQFN (3.5 mm x 9 mm x 0.75 mm) package and is priced at $1.15 per unit in 2,000-unit quantities.

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