Overview
The SN74CB3Q3251PWR, produced by Texas Instruments, is a 1-of-8 FET multiplexer/demultiplexer designed for high-bandwidth applications. This device operates as a 2.5-V/3.3-V low-voltage bus switch, making it ideal for broadband communications, networking, and data-intensive computing systems. It features a single output-enable (OE) input and select inputs (S0, S1, S2) that control the data path, allowing bidirectional data flow between ports when enabled.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC Supply Voltage Range | -0.5 | 4.6 | V | |
| VIN Control Input Voltage Range | -0.5 | 7 | V | |
| VI/O Switch I/O Voltage Range | -0.5 | 7 | V | |
| ICC Power Consumption | 1 | 4 | mA | |
| ron ON-State Resistance | 4 | Ω | ||
| fOE or fS Switching Frequency | 20 | MHz | ||
| tpd Propagation Delay | 0.12 | 0.18 | ns | |
| Cin Control Input Capacitance | 2.5 | 4.5 | pF | |
| Cio(OFF) Switch OFF Capacitance | 3.5 | 4.5 | pF |
Key Features
- High-bandwidth data path (up to 500 MHz)
- Low power consumption (ICC = 1 mA Typ)
- Low and flat ON-state resistance (ron = 4 Ω Typ)
- Rail-to-rail switching on data I/O ports
- 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
- Bidirectional data flow with near-zero propagation delay
- Low input/output capacitance minimizes loading and signal distortion
- Supports partial-power-down mode operation
- ESD performance tested per JESD 22 (2000-V Human-Body Model, 1000-V Charged-Device Model)
Applications
- PCI interface
- Differential signal interface
- Memory interleaving
- Bus isolation
- Low-distortion signal gating
- Broadband communications
- Networking
- Data-intensive computing systems
Q & A
- What is the primary function of the SN74CB3Q3251?
The SN74CB3Q3251 is a 1-of-8 FET multiplexer/demultiplexer designed for high-bandwidth applications.
- What is the operating voltage range for the SN74CB3Q3251?
The device operates within a VCC supply voltage range of 2.3 V to 3.6 V.
- What is the typical ON-state resistance of the SN74CB3Q3251?
The typical ON-state resistance (ron) is 4 Ω.
- How does the SN74CB3Q3251 handle power-down scenarios?
The device supports partial-power-down mode operation and has Ioff circuitry to prevent damaging current backflow when powered down.
- What are the switching frequencies for the control inputs?
The switching frequency for the control inputs (OE or S) is up to 20 MHz.
- What is the propagation delay of the SN74CB3Q3251?
The propagation delay (tpd) is between 0.12 ns and 0.18 ns.
- Is the SN74CB3Q3251 ESD protected?
Yes, the device has ESD performance tested per JESD 22 (2000-V Human-Body Model, 1000-V Charged-Device Model).
- What are the typical applications for the SN74CB3Q3251?
The device is used in PCI interfaces, differential signal interfaces, memory interleaving, bus isolation, and low-distortion signal gating, among others.
- How does the SN74CB3Q3251 minimize signal distortion?
The device has low input/output capacitance to minimize capacitive loading and signal distortion on the data bus.
- What are the package options available for the SN74CB3Q3251?
The device is available in SSOP (DBQ), TVSOP (DGV), TSSOP (PW), and VQFN (RGY) packages.
