The FST32245 is an octal bus switch with a 25Ω series resistor. The switch has a low On Resistance, allowing inputs to be connected to outputs without adding propagation delay or generating additional ground bounce noise. The device is organized as an 8-bit switch. When OE is LOW, the switch is ON and Port A is connected to Port B. When OE is HIGH, the switch is OPEN and a high-impedance state exists between the two ports. The FST32245 has an equivalent 25Ω series resistor to reduce signal-reflection noise, eliminating the need for external terminating resistors.
The Fairchild FST32245 is a high-speed CMOS TTL-compatible octal bus switch designed in a standard '245 pin-out. It features internal 25Ω series resistors at the outputs to minimize signal-reflection noise, eliminating the need for external terminating resistors.
| Supply Voltage (VCC) | 4.0V to 5.5V |
|---|---|
| Switch Control Input Rise/Fall Time | 0 ns/V to 5 ns/V |
| Propagation Delay Bus to Bus | 1.25 ns |
When OE is LOW, the switch connects Port A to Port B; when OE is HIGH, the switch disconnects and enters a high-impedance state.
No, the FST32245 has equivalent 25Ω series resistors built-in to reduce signal-reflection noise.