The SN74CB3Q3251 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 (r_on). 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 SN74CB3Q3251 provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems.

The SN74CB3Q3251 is a 1-of-8 multiplexer/demultiplexer with a single output-enable (OE\) input. The select (S0, S1, S2) inputs control the data path of the multiplexer/demultiplexer. When OE\ is low, the multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE\ is high, the multiplexer/demultiplexer is disabled, and a high-impedance state exists between the A and B ports.

This device is fully specified for partial-power-down applications using I_off. The I_off 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\ should be tied to V_CC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

• High-Bandwidth Data Path (up to 500 MHz (1))
• Equivalent to IDTQS3VH251 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

• Configuration
• 8:1
• Number of channels (#)
• 1
• Power supply voltage - single (V)
• 2.5, 3.3
• Protocols
• Analog
• Ron (Typ) (Ohms)
• 3.5
• CON (Typ) (pF)
• 15
• Bandwidth (MHz)
• 500
• Operating temperature range (C)
• -40 to 85
• Features
• Powered-off protection, Supports input voltage beyond supply
• Input/output continuous current (Max) (mA)
• 64
• Rating
• Catalog
• Supply current (Typ) (uA)
• 600

SN74CB3Q3251的完整型号有：SN74CB3Q3251DBQR、SN74CB3Q3251DGVR、SN74CB3Q3251PW、SN74CB3Q3251PWR、SN74CB3Q3251RGYR，以下是这些产品的关键参数及官网采购报价：

SN74CB3Q3251DBQR，工作温度：-40 to 85，封装：SSOP (DBQ)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网SN74CB3Q3251DBQR的批量USD价格：.281（1000+）

SN74CB3Q3251DGVR，工作温度：-40 to 85，封装：TVSOP (DGV)-16，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74CB3Q3251DGVR的批量USD价格：.281（1000+）

SN74CB3Q3251PW，工作温度：-40 to 85，封装：TSSOP (PW)-16，包装数量MPQ：90个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74CB3Q3251PW的批量USD价格：.337（1000+）

SN74CB3Q3251PWR，工作温度：-40 to 85，封装：TSSOP (PW)-16，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN74CB3Q3251PWR的批量USD价格：.281（1000+）

SN74CB3Q3251RGYR，工作温度：-40 to 85，封装：VQFN (RGY)-16，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-2-260C-1 YEAR，引脚镀层/焊球材料：NIPDAU，TI官网SN74CB3Q3251RGYR的批量USD价格：.281（1000+）

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