Overview
The onsemi 74FST3257 is a quad 2:1 high-performance multiplexer/demultiplexer bus switch. This device is CMOS TTL compatible and operates within a voltage range of 4 to 5.5 volts. It is designed to provide extremely low on-resistance (RON) and nearly zero propagation delay, making it ideal for applications requiring minimal signal distortion and high-speed data transfer. The 74FST3257 also features low standby current and does not introduce noise or ground bounce into the system.
Key Specifications
| Parameter | Min | Typical | Max | Units |
|---|---|---|---|---|
| VCC (DC Supply Voltage) | -0.5 | 7.0 | V | |
| VI (DC Input Voltage) | -0.5 | 7.0 | V | |
| VO (DC Output Voltage) | -0.5 | 7.0 | V | |
| RON (Switch On Resistance) | 4 | 7 | Ω | |
| tPHL, tPLH (Propagation Delay Bus to Bus) | 0.25 | 0.25 | ns | |
| ICC (DC Supply Current per Supply Pin) | 3 | μA | ||
| TSTG (Storage Temperature Range) | -65 | 150 | °C | |
| TJ (Junction Temperature Under Bias) | 150 | °C |
Key Features
- Extremely low RON (typically 4 Ω)
- Less than 0.25 ns maximum delay through switch
- Nearly zero standby current
- No circuit bounce or noise introduction
- Control inputs are TTL/CMOS compatible
- Pin-for-pin compatible with QS3257, FST3257, CBT3257
- Available in popular packages: SOIC-16, TSSOP-16, QFN16
- Pb-free and RoHS compliant
Applications
The 74FST3257 is suitable for a variety of high-speed data transfer applications, including:
- High-speed data buses
- Peripheral component interconnects (PCI)
- Memory interfaces
- Telecommunications equipment
- Automotive systems (with NLV prefix for unique site and control change requirements)
Q & A
- What is the operating voltage range of the 74FST3257?
The 74FST3257 operates between 4 and 5.5 volts.
- What is the typical on-resistance (RON) of the 74FST3257?
The typical on-resistance is 4 Ω.
- What is the maximum propagation delay through the switch?
The maximum propagation delay is less than 0.25 ns.
- Does the 74FST3257 introduce noise or ground bounce into the system?
No, the device does not introduce noise or ground bounce.
- What are the available package options for the 74FST3257?
The device is available in SOIC-16, TSSOP-16, and QFN16 packages.
- Is the 74FST3257 Pb-free and RoHS compliant?
- What is the storage temperature range for the 74FST3257?
The storage temperature range is -65°C to +150°C.
- What is the junction temperature under bias for the 74FST3257?
The junction temperature under bias is +150°C.
- Are the control inputs of the 74FST3257 TTL/CMOS compatible?
- Is the 74FST3257 pin-for-pin compatible with other devices?
