Overview
The SN74CB3Q3245, produced by Texas Instruments, is a high-bandwidth 8-bit FET bus switch designed to support high-bandwidth applications. This device is optimized for broadband communications, networking, and data-intensive computing systems. It features a low and flat ON-state resistance, minimal propagation delay, and rail-to-rail switching on the data input/output (I/O) ports. The SN74CB3Q3245 is part of the CB3Q family, which utilizes a charge pump to elevate the gate voltage of the pass transistor, ensuring high performance and low signal distortion.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Supply Voltage (VCC) | 2.3 | - | 3.6 | V |
| Operating Temperature Range | -40 | - | 85 | °C |
| ON-State Resistance (ron) | 4 | - | 8 | Ω |
| Propagation Delay (tpd) | 0.12 | - | 0.20 | ns |
| Data I/O Voltage Range | 0 | - | 5.5 | V |
| Control Input Voltage Range | 0 | - | 5.5 | V |
| High-Level Control Input Voltage (VIH) | 1.7 | - | 5.5 | V |
| Low-Level Control Input Voltage (VIL) | 0 | - | 0.8 | V |
Key Features
- High-bandwidth data path (up to 500 MHz)
- Low and flat ON-state resistance (ron) for minimal propagation delay
- Low power consumption (ICC = 1 mA typical)
- 5-V tolerant I/Os with device powered up or powered down
- Data I/Os support 0- to 5-V signaling levels
- Control inputs can be driven by TTL or 5-V/3.3-V CMOS outputs
- Low data I/O capacitance to minimize capacitive loading and signal distortion
- Ioff circuitry prevents damaging current backflow during power-down
- Isolation during power off
Applications
The SN74CB3Q3245 is ideally suited for various high-bandwidth applications, including:
- Broadband communications
- Networking systems
- Data-intensive computing systems
Q & A
- What is the operating supply voltage range of the SN74CB3Q3245?
The operating supply voltage range is from 2.3 V to 3.6 V.
- What is the maximum propagation delay of the SN74CB3Q3245?
The maximum propagation delay is 0.20 ns.
- What is the ON-state resistance (ron) of the SN74CB3Q3245?
The ON-state resistance (ron) is typically 4 Ω to 8 Ω.
- Is the SN74CB3Q3245 5-V tolerant?
- What is the data I/O voltage range supported by the SN74CB3Q3245?
The data I/O voltage range is from 0 V to 5.5 V.
- How does the Ioff circuitry function in the SN74CB3Q3245?
The Ioff circuitry prevents damaging current backflow through the device when it is powered down.
- What are the typical applications of the SN74CB3Q3245?
The device is typically used in broadband communications, networking systems, and data-intensive computing systems.
- Can the control inputs of the SN74CB3Q3245 be driven by TTL or CMOS outputs?
- What is the significance of the charge pump in the SN74CB3Q3245?
The charge pump elevates the gate voltage of the pass transistor, providing a low and flat ON-state resistance.
- How does the SN74CB3Q3245 handle power-up and power-down states?
The device ensures a high-impedance state during power up or power down by tying the OE input to VCC through a pullup resistor.
