The SN74CBTK16245 device provides 16 bits of high-speed TTL-compatible bus switching in a standard ’16245 device pinout. The low on-state resistance of the switch allows connections to be made with minimal propagation delay. The A and B ports have an active-clamp undershoot-protection circuit. When there is an undershoot, the active-clamp circuit is enabled, and current from VCC is supplied to clamp the output, preventing the pass transistor from turning on. The device is organized as two 8-bit low-impedance switches with separate output-enable (OE\) inputs. When OE\ is low, the switch is on, and data can flow from the A port to the B port, or vice versa. When OE\ is high, the switch is open, and the high-impedance state exists between the two ports. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.