The FST34X2245 is a 32-bit high speed CMOS TTL-compatible bus switch with 25Ω series resistors in outputs from Fairchild.
The FST34X2245 provides high‑speed CMOS TTL‑compatible bus switching in a flow‑through mode. When OE is LOW the switch connects Port A to Port B, and when OE is HIGH the switch opens, offering a high‑impedance state. Integrated 25 Ω series resistors at each output minimize signal‑reflection noise, removing the need for external termination.
Electrical specifications include a supply voltage range of –0.5 V to +7.0 V, output current capability of 128 mA, and typical on‑resistance of about 20 Ω. The device is supplied in an 80‑lead QVSOP (JEDEC MO‑154) package that is 0.150 inches wide. A life‑support policy disclaimer notes the component is not approved for critical medical applications.
| Supply Voltage (VCC) | –0.5 V to +7.0 V |
|---|---|
| Output Current (IOUT) | 128 mA |
| On Resistance (RON) typical | 20 Ω (VIN=0 V, IIN=64 mA) |
| Package | 80‑Lead QVSOP, JEDEC MO‑154, 0.150" wide |
They reduce signal‑reflection noise, eliminating the need for external terminating resistors.
For normal operation the supply voltage should be between 4.0 V and 5.5 V.
The device can sink up to 128 mA of output current.