The CD74FCT541 is an octal buffer/driver with 3-state outputs that is ideal for driving bus lines or buffer memory address registers and uses a small-geometry BiCMOS technology. The output stage is a combination of bipolar and CMOS transistors that limits the output high level to two diode drops below VCC. This resultant lowering of output swing (0 V to 3.7 V) reduces power-bus ringing [a source of electromagnetic interference (EMI)] and minimizes VCC bounce and ground bounce and their effects during simultaneous output switching. The output configuration also enhances switching speed and is capable of sinking 64 mA.
The 3-state control gate is a two-input AND gate with active-low inputs, so that if either output-enable (OE1 or OE2) input is high, all corresponding outputs are in the high-impedance state. The outputs provide noninverted data when they are not in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The CD74FCT541 is characterized for operation from 0°C to 70°C.
| Technology family | FCT |
| Supply voltage (min) (V) | 4.75 |
| Supply voltage (max) (V) | 5.25 |
| Number of channels | 8 |
| IOL (max) (mA) | 64 |
| Supply current (max) (µA) | 80 |
| IOH (max) (mA) | -15 |
| Input type | TTL-Compatible CMOS |
| Output type | 3-State |
| Features | Over-voltage tolerant inputs, Very high speed (tpd 5-10ns) |
| Rating | Catalog |
| Operating temperature range (°C) | 0 to 70 |
| PDIP (N) | 20 | 228.702 mm² 24.33 x 9.4 |
| SOIC (DW) | 20 | 131.84 mm² 12.8 x 10.3 |