• High-Bandwidth Data Path (up to 500 MHz)
• 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 Typical)
• 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 and Output Capacitance Minimizes Loading and Signal Distortion (Cio(OFF) = 3.5 pF Typical)
• Fast Switching Frequency (fOE = 20 MHz Maximum)
• Data and Control Inputs Provide Undershoot Clamp Diodes
• Low Power Consumption (ICC = 0.7 mA Typical)
• VCC Operating Range From 2.3 V to 3.6 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: USB Interface, Differential Signal Interface, Bus Isolation, Low-Distortion Signal Gating (1)

(1) For additional information regarding the performance characteristics of the CB3Q family, refer to the TI application report, CBT-C, CB3T, and CB3Q Signal-Switch Families, SCDA008.

• IP Phones: Wired and Wireless
• Optical Modules
• Optical Networking: Video Over Fiber and EPON
• Private Branch Exchange (PBX)
• WiMAX and Wireless Infrastructure Equipment

The SN74CB3Q3257 device 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).

PART NUMBER	PACKAGE	BODY SIZE (NOM)
SN74CB3Q3257D	SOIC (16)	9.90 mm × 3.91 mm
SN74CB3Q3257DB	SSOP (6)	6.20 mm × 5.30 mm
SN74CB3Q3257DGV	TVSOP (16)	3.60 mm × 4.40 mm
SN74CB3Q3257DBQ	SSOP (16)	4.90 mm × 3.90 mm
SN74CB3Q3257PW	TSSOP (16)	5.00 mm × 4.40 mm
SN74CB3Q3257RGY	VQFN (16)	4.00 mm × 3.50 mm

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