Description

The QS3245 provides a set of eight high-speed CMOS TTL-compatible bus switches in a pinout compatible with 74FCT245, 74F245, 74ALS/AS/LS245 8-bit transceivers. QuickSwitch devices provide an order of magnitude faster speed than conventional logic devices. The low ON resistance of the QS3245 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. The Output Enable (OE) signal turns the switches on similar to the OE signal of the 74’245. The QS3245 is characterized for operation at -40°C to +85°C.

Specifications and features

• Enhanced N channel FET with no inherent diode to Vcc
• 5Ω bidirectional switches connect inputs to outputs
• Pin compatible with the 74F245, 74FCT245, and 74FCT245T
• Low power CMOS proprietary technology
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control inputs
• TTL-compatible control inputs
• Available in SOIC and QSOP packages

Application Scenarios

• Hot-swapping, hot-docking
• Voltage translation (5V to 3.3V)
• Power conservation
• Capacitance reduction and isolation
• Logic replacement (data processing)
• Clock gating
• Bus switching and isolation

Comparison

• Faster speed than conventional logic devices
• Low ON resistance allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise
• Zero propagation delay, zero ground bounce
• Undershoot clamp diodes on all switch and control inputs
• Pin compatible with multiple 8-bit transceivers

• None mentioned