SN74CB3Q3251

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Product details

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
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
SSOP (DBQ) 16 29 mm² 4.9 x 6 TSSOP (PW) 16 22 mm² 4.4 x 5 TVSOP (DGV) 16 23 mm² 3.6 x 6.4 VQFN (RGY) 16 14 mm² 4 x 3.5
  • 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
  • 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

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 (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 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 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\ 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.

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 (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 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 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\ 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.

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Technical documentation

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Type Title Date
* Data sheet SN74CB3Q3251 datasheet (Rev. A) 23 Mar 2005
Application note Selecting the Correct Texas Instruments Signal Switch (Rev. D) 09 Dec 2021
Application note Multiplexers and Signal Switches Glossary (Rev. B) 01 Dec 2021
Application note CBT-C, CB3T, and CB3Q Signal-Switch Families (Rev. C) 19 Nov 2021
Application note Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C) 06 Jan 2021
Selection guide Logic Guide (Rev. AB) 12 Jun 2017
Application note Understanding and Interpreting Standard-Logic Data Sheets (Rev. C) 02 Dec 2015
User guide LOGIC Pocket Data Book (Rev. B) 16 Jan 2007
More literature Digital Bus Switch Selection Guide (Rev. A) 10 Nov 2004
Application note Semiconductor Packing Material Electrostatic Discharge (ESD) Protection 08 Jul 2004
User guide Signal Switch Data Book (Rev. A) 14 Nov 2003
More literature Logic Cross-Reference (Rev. A) 07 Oct 2003
Application note Bus FET Switch Solutions for Live Insertion Applications 07 Feb 2003

Design & development

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SN74CB3Q3251 IBIS Model

SCDM077.ZIP (42 KB) - IBIS Model
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SSOP (DBQ) 16 View options
TSSOP (PW) 16 View options
TVSOP (DGV) 16 View options
VQFN (RGY) 16 View options

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