Overview
The SN74CB3Q3257PW is a high-bandwidth FET bus switch produced by Texas Instruments. This device utilizes a charge pump to elevate the gate voltage of the pass transistor, resulting in a low and flat ON-state resistance (ron). This design enables minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The SN74CB3Q3257 is specifically designed to support high-bandwidth applications, making it an ideal solution for broadband communications, networking, and data-intensive computing systems.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP (PW) | |
| Pins | 16 | |
| Operating Temperature Range | -40 to 85 | °C |
| ON-state Resistance (ron) | 4Ω (typical) | Ω |
| High-bandwidth Data Path | Up to 500 MHz | |
| VCC Operating Range | 2.3V to 3.6V | V |
| Data I/O Signal Levels | 0 to 5V (0.8V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V) | V |
| Input/Output Capacitance (Cio(OFF)) | 3.5 pF (typical) | pF |
| Switching Frequency (f OE) | Up to 20 MHz | |
| Power Consumption (ICC) | 0.7 mA (typical) | mA |
| ESD Performance | 2000V Human Body Model, 1000V Charged-Device Model |
Key Features
- High-bandwidth data path (up to 500 MHz)
- 5V tolerant I/Os with device powered up or powered down
- Low and flat ON-state resistance (ron) characteristics over operating range
- Rail-to-rail switching on data I/O ports
- Bidirectional data flow with near-zero propagation delay
- Low input and output capacitance minimizes loading and signal distortion
- Fast switching frequency (f OE = 20MHz maximum)
- Data and control inputs provide undershoot clamp diodes
- Low power consumption (ICC = 0.7mA typical)
- VCC operating range from 2.3V to 3.6V
- Data I/Os support 0- to 5V signaling levels
- Control inputs can be driven by TTL or 5V and 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
Applications
- IP Phones: wired and wireless
- Optical modules
- 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 SN74CB3Q3257PW device?
The SN74CB3Q3257PW is a high-bandwidth FET bus switch that uses a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance.
- What is the operating temperature range of the SN74CB3Q3257PW?
The operating temperature range is from -40°C to 85°C.
- What are the supported VCC operating ranges for the SN74CB3Q3257PW?
The VCC operating range is from 2.3V to 3.6V.
- What are the typical ON-state resistance and input/output capacitance values for the SN74CB3Q3257PW?
The typical ON-state resistance (ron) is 4Ω, and the typical input/output capacitance (Cio(OFF)) is 3.5 pF.
- Can the SN74CB3Q3257PW handle 5V signal levels?
- What is the maximum switching frequency for the SN74CB3Q3257PW?
The maximum switching frequency (f OE) is 20 MHz.
- Does the SN74CB3Q3257PW support partial-power-down mode operation?
- What are the ESD performance ratings for the SN74CB3Q3257PW?
The device has an ESD performance rating of 2000V Human Body Model and 1000V Charged-Device Model.
- What types of applications is the SN74CB3Q3257PW suited for?
The device is suited for broadband communications, networking, data-intensive computing systems, IP phones, optical modules, optical networking, PBX, and WiMAX and wireless infrastructure equipment.
- Can the control inputs of the SN74CB3Q3257PW be driven by TTL or CMOS outputs?
- What is the typical power consumption of the SN74CB3Q3257PW?
The typical power consumption (ICC) is 0.7 mA.
