16-Bit FET Bus Switch With Active-Clamp Undershoot Protection Circuit
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.
By Texas Instruments
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