SN74CBTLV3257PWR

• Four Channels of 2:1 (SPDT) Analog switching, Non-Inverting
• 2.3 V to 3.6 V Supply Range for 3.3 V Logic Systems
• 40 Ohm on-resistance; 200 MHz Bandwidth
• 250 Ps Propagation Delay Through the Switch Path
• 10 Microamp Supply current; 128 mA High- and Low-Level Output Current
• 16-Pin TSSOP package, 5 Mm X 4.4 Mm X 1.2 mm; -40°C to 85°C, Lead-free, RoHS Compliant

The Texas Instruments SN74CBTLV3257PWR is a 3.3 V four-channel 2:1 (SPDT) analog switch with partial-power-down mode, supplied in a 16-pin TSSOP package. It operates from a 2.3 V to 3.6 V supply, presents about 40 ohms of on-resistance, and delivers 250 ps propagation delay with 200 MHz bandwidth. The SN74CBTLV3257PWR draws roughly 10 microamps of supply current, provides 128 mA output drive, and is rated for -40°C to 85°C with a 150°C maximum junction temperature.

A crossbar or bus switch passes signals through a low-resistance FET path rather than re-driving them, so it adds almost no propagation delay, which is why the 250 ps figure matters more here than in a conventional multiplexer. Four 2:1 channels are typically used to route a bus, clock, or interface between two destinations, for example switching a debug port, selecting between redundant sources, or steering a peripheral bus between two controllers. Partial-power-down mode lets the switch isolate an unpowered section without back-powering it through the signal pins, which protects hot-swappable or independently powered subsystems. Hardware engineers in networking, computing, storage, and instrumentation use parts like this for bus routing and card-edge isolation.