SN74CBT16211C

      The SN74CBT16211C are Member of the Texas Instruments Widebus Family, Undershoot Protection for Off-Isolation on A and B Ports Up To −2 V, Bidirectional Data Flow, With Near-Zero Propagation Delay, Low ON-State Resistance (ron) Characteristics (ron = 3 Ω Typical), Low Input/Output Capacitance Minimizes Loading and Signal Distortion (Cio(OFF) = 5.5 pF Typical), Data and Control Inputs Provide Undershoot Clamp Diodes, Low Power Consumption(ICC = 3 µA Max), VCC Operating Range From 4 V to 5.5 V, Data I/Os Support 0 to 5-V Signaling Levels (0.8-V, 1.2-V, 1.5-V, 1.8-V, 2.5-V, 3.3-V, 5-V), Control Inputs Can Be Driven by TTL or 5-V/3.3-V CMOS Outputs, Ioff Supports Partial-Power-Down Mode Operation, Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II, ESD Performance Tested Per JESD 22−  2000-V Human-Body Model(A114-B, Class II)−  1000-V Charged-Device Model (C101), Supports Both Digital and Analog, Applications: PCI Interface, Memory Interleaving, Bus Isolation, Low-Distortion Signal Gating.
      The SN74CBT16211C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT16211C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring that the switch remains in the proper OFF state.
      The SN74CBT16211C is organized as two 12-bit bus switches with separate output-enable (1OE, 2OE) inputs. It can be used as two 12-bit bus switches or as one 24-bit bus switch. When OE is low, the associated 12-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 12-bit bus switch is OFF, and the high-impedance state exists between the A and B ports.
      This  SN74CBT16211C is  fully  specified  for  partial-power-down  applications  using  Ioff.  The  Ioff  feature  ensures  that damaging current will not backflow through the device when it is powered down. The device has isolation during power off. To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.