Overview
The SN74CB3Q3125 device, produced by Texas Instruments, is a high-bandwidth FET bus switch designed to provide low and flat ON-state resistance (ron) through the use of a charge pump to elevate the gate voltage of the pass transistor. This device supports minimal propagation delay and rail-to-rail switching on the data input/output (I/O) ports, making it ideal for high-bandwidth applications such as broadband communications, networking, and data-intensive computing systems. The device is organized as four 1-bit bus switches with separate output-enable inputs, allowing for bidirectional data flow between ports when the output enable (OE) is low, and a high-impedance state when OE is high.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC (Supply Voltage) | -0.5 | - | 4.6 | V |
| VIN (Control Input Voltage) | -0.5 | - | 7 | V |
| VI/O (Switch I/O Voltage) | -0.5 | - | 7 | V |
| ON-State Resistance (ron) | - | 3 | - | Ω |
| Switching Frequency (fOE) | - | - | 20 | MHz |
| Operating Free-Air Temperature (TA) | -40 | - | 85 | °C |
| Supply Current (ICC) | - | 0.3 | 1 | mA |
| Input and Output Capacitance (Cio(OFF)) | - | 3.5 | - | pF |
Key Features
- High-bandwidth data path (up to 500 MHz)
- Low and flat ON-state resistance (ron = 3 Ω Typ)
- Rail-to-rail switching on data I/O ports for 0-V to 5-V signaling levels
- Bidirectional data flow with near-zero propagation delay
- Low input and output capacitance (Cio(OFF) = 3.5 pF Typ) to minimize loading and signal distortion
- Fast switching frequency (fOE = 20 MHz Max)
- Data and control inputs provide undershoot clamp diodes
- Low power consumption (ICC = 0.3 mA Typ)
- VCC operating range from 2.3 V to 3.6 V
- 5-V tolerant I/Os with device powered up or powered down
- Control inputs can be driven by TTL, 5-V, or 3.3-V CMOS outputs
- Ioff supports partial-power-down mode operation
- ESD performance tested per JESD 22 (2000-V Human-Body Model, 1000-V Charged-Device Model)
Applications
- IP Phones: Wired and Wireless
- Optical Modules and Optical Networking: Video Over Fiber and EPON
- Private Branch Exchange (PBX)
- WiMAX and Wireless Infrastructure Equipment
- USB Interface, Differential Signal Interface, Bus Isolation, Low-Distortion Signal Gating
Q & A
- What is the primary function of the SN74CB3Q3125 device?
The SN74CB3Q3125 is a high-bandwidth FET bus switch that provides low and flat ON-state resistance and supports rail-to-rail switching on data I/O ports.
- What is the maximum switching frequency of the SN74CB3Q3125?
The maximum switching frequency (fOE) is 20 MHz.
- What are the operating voltage ranges for the SN74CB3Q3125?
The VCC operating range is from 2.3 V to 3.6 V, and the data I/Os support 0-V to 5-V signaling levels.
- Can the SN74CB3Q3125 handle 5-V tolerant I/Os?
- What types of control inputs can drive the SN74CB3Q3125?
The control inputs can be driven by TTL, 5-V, or 3.3-V CMOS outputs.
- Does the SN74CB3Q3125 support partial-power-down mode operation?
- What is the typical ON-state resistance (ron) of the SN74CB3Q3125?
The typical ON-state resistance (ron) is 3 Ω.
- What are the typical applications of the SN74CB3Q3125?
The device is used in IP phones, optical networking, PBX, WiMAX and wireless infrastructure equipment, and other high-bandwidth applications.
- How does the SN74CB3Q3125 minimize capacitive loading and signal distortion?
The device features low input and output capacitance (Cio(OFF) = 3.5 pF Typ) to minimize capacitive loading and signal distortion.
- What is the ESD performance of the SN74CB3Q3125?
The device has ESD performance tested per JESD 22 (2000-V Human-Body Model, 1000-V Charged-Device Model).
