SN74CB3Q3245PWR

The SN74CB3Q3245 is a high- bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON- state resistance (ron). The low and flat ON- state resistance allows for minimal propagation delay and supports rail- to- rail switching on the data input/output (I/O) ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high- bandwidth applications, the SN74CB3Q3245 provides an optimized interface solution ideally suited for broadband communications, networking, and data- intensive computing systems. The SN74CB3Q3245 is organized as an 8- bit bus switch with a single output- enable (OE(overline)) input. When OE(overline) is low, the bus switch is ON and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE(overline) is high, the bus switch is OFF and a high- impedance state exists between the A and B ports. This device is fully specified for partial- power- down applications using Ioff. The Ioff circuitry prevents damaging current 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(overline) 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.

Applications

• PCI interface
• Differential signal interface
• Memory interleaving
• Bus isolation
• Low-distortion signal gating

Key features

• High- Bandwidth Data Path (up to 500 MHz)
• Equivalent to IDTQS3VH384 Device
• 5- V Tolerant I/Os With Device Powered Up or Powered Down
• Low and Flat ON- State Resistance (ron) Characteristics Over Operating Range (ron = 4 Ω Typ)
• Rail- to- Rail Switching on Data I/O Ports
• 0- to 5- V Switching With 3.3- V VCC
• 0- to 3.3- V Switching With 2.5- V VCC
• Bidirectional Data Flow With Near- Zero Propagation Delay
• Low Input/Output Capacitance Minimizes Loading and Signal Distortion (Cio(OFF) = 3.5 pF Typ)
• Fast Switching Frequency (fOE = 20 MHz Max)
• Data and Control Inputs Provide Undershoot Clamp Diodes
• Low Power Consumption (ICC = 1 mA Typical)
• VCC Operating Range From 2.3V to 3.6V
• Data I/Os Support 0- to 5- V Signaling Levels (0.8V,1.2V,1.5V,1.8V,2.5V,3.3V,5V)
• 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, Differential Signal Interface, Memory Interleaving, Bus Isolation, Low- Distortion Signal Gating