Overview
The SN74CB3Q3305DCUR, produced by Texas Instruments, is a dual FET bus switch designed for high-bandwidth applications. This device utilizes a charge pump to elevate the gate voltage of the pass transistor, resulting in a low and flat ON-state resistance. This feature allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The SN74CB3Q3305 is particularly suited for broadband communications, networking, and data-intensive computing systems due to its high-bandwidth data path capability of up to 500 MHz.
Key Specifications
| Parameter | Test Conditions | Min | Max | Unit | |
|---|---|---|---|---|---|
| VCC Operating Range | 2.3 V | 3.6 V | V | ||
| ON-State Resistance (ron) | VCC = 3.3 V, IO = 15 mA | 3 Ω | Ω | ||
| Propagation Delay (tpd) | VCC = 2.5 V ± 0.2 V | 0.09 ns | 0.15 ns | ns | |
| Propagation Delay (tpd) | VCC = 3.3 V ± 0.3 V | 0.09 ns | 0.15 ns | ns | |
| Switching Frequency (fOE) | VCC = 2.5 V ± 0.2 V | 10 MHz | MHz | ||
| Switching Frequency (fOE) | VCC = 3.3 V ± 0.3 V | 20 MHz | MHz | ||
| Input/Output Capacitance (Cio) | VCC = 3.3 V, VIN = VCC or GND | 3.5 pF | 5 pF | pF | |
| Package | VSSOP (8), TSSOP (8) | ||||
| Body Size (Nom) | VSSOP | 2.00 mm × 3.10 mm | mm | ||
| Body Size (Nom) | TSSOP | 3.00 mm × 6.10 mm | mm |
Key Features
- High-bandwidth data path up to 500 MHz
- 5-V tolerant I/Os with device powered up or powered down
- Low and flat ON-state resistance (ron)
- Rail-to-rail switching on data I/O ports: 0 V to 5 V with 3.3 V VCC or 0 V to 3.3 V with 2.5 V VCC
- Bidirectional data flow with near-zero propagation delay
- Low input/output capacitance to minimize capacitive loading and signal distortion
- Fast switching frequency up to 20 MHz
- Data and control inputs provide undershoot clamp diodes
- Low power consumption (ICC = 0.25 mA typical)
- Ioff supports partial-power-down mode operation
- Latch-up performance exceeds 100 mA per JESD 78, Class II
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, differential signal interface
- Bus isolation
Q & A
- What is the maximum bandwidth of the SN74CB3Q3305?
The SN74CB3Q3305 supports a high-bandwidth data path up to 500 MHz.
- What are the operating voltage ranges for the SN74CB3Q3305?
The device operates within a VCC range of 2.3 V to 3.6 V.
- Is the SN74CB3Q3305 tolerant to 5V inputs?
- What is the typical ON-state resistance of the SN74CB3Q3305?
The typical ON-state resistance (ron) is 3 Ω.
- Can the SN74CB3Q3305 handle bidirectional data flow?
- What is the maximum switching frequency for the control input?
The maximum switching frequency for the control input is 20 MHz at VCC = 3.3 V.
- How does the SN74CB3Q3305 handle partial-power-down mode?
The device features Ioff circuitry that prevents damaging current backflow when it is powered down.
- What are the package options for the SN74CB3Q3305?
The device is available in VSSOP (8) and TSSOP (8) packages.
- What are some common applications of the SN74CB3Q3305?
- How should the OE pin be managed during power-up or power-down?
The OE pin should be tied to GND through a pulldown resistor to ensure a high-impedance state during power-up or power-down.
