SN74CB3Q3251
- High-bandwidth data path (up to 500MHz)
- Equivalent to IDTQS3VH251 device
- 5V tolerant I/Os with device powered up or powered down
- Low and flat ON-state resistance (ron) characteristics over operating range (ron = 4Ω Typ)
- Rail-to-rail
switching on data I/O ports
- 0 to 5V switching with 3.3V VCC
- 0 to 3.3V switching with 2.5V 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 or fS = 20 MHz Max). For additional information regarding the performance characteristics of the CB3Q family, refer to the TI application note, CBT-C, CB3T, and CB3Q Signal-Switch Families.
- Data and controlinputs provide undershoot clamp diodes
- Low power consumption (ICC = 1mA Typ)
- VCC operating range from 2.3V to 3.6V
- Data I/Os support 0 to 5V signaling levels (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V)
- Control inputs can be driven by TTL or 5V/3.3V CMOS outputs
- Ioff supports partial-power-down mode operation
- Latch-Up performance exceeds 100mA per JESD 78, class II
- ESD performance
tested per JESD 22
- 2000V human-body model (A114B, Class II)
- 1000V charged-device model (C101)
- Supports both digital and analog applications: PCI interface, differential signal interface, memory interleaving, bus isolation, low-distortion signal gating
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 must be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
技術資料
| 上位の文書 | タイプ | タイトル | フォーマットオプション | 最新の英語版をダウンロード | 日付 | |
|---|---|---|---|---|---|---|
| * | データシート | SN74CB3Q3251 1-of-8 FET Multiplexer/Demultiplexer 2.5V-3.3V Low-voltage High-bandwidth BUS Switch データシート (Rev. B) | PDF | HTML | 2026/08/21 | ||
| アプリケーション・ノート | テキサス インスツルメンツの信号スイッチの選定 | PDF | HTML | PDF | HTML | 2026/06/29 | ||
| アプリケーション・ノート | Multiplexers and Signal Switches Glossary (Rev. B) | PDF | HTML | 2021/12/01 | |||
| アプリケーション概要 | Eliminate Power Sequencing with Powered-off Protection Signal Switches (Rev. C) | PDF | HTML | 2021/01/06 |
設計と開発
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