Features: BiCMOS Technology With Low Quiescent PowerBuffered InputsNoninverted OutputsInput/Output Isolation From VCCControlled Output Edge Rates64-mA Output Sink CurrentOutput Voltage Swing Limited to 3.7 V at VCC = 5 VSCR Latch-Up-Resistant BiCMOS Process and Circuit DesignPackage Options Includ...
CD74FCT244: Features: BiCMOS Technology With Low Quiescent PowerBuffered InputsNoninverted OutputsInput/Output Isolation From VCCControlled Output Edge Rates64-mA Output Sink CurrentOutput Voltage Swing Limited...
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The CD74FCT244 and CD74FCT244AT are octal buffer/line drivers with 3-state outputs using a small-geometry BiCMOS technology. The output stages are a combination of bipolar and CMOS transistors that limit the output high level to two CD74FCT244 diode drops below VCC. This resultant lowering of output swing (0 V to 3.7 V) reduces the 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.
CD74FCT244 are organized as two 4-bit buffers/line drivers with separate active-low output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, the outputs are 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 CD74FCT244 minimum value of the resistor is determined by the current-sinking capability of the driver.
The CD74FCT244 and CD74FCT244AT devices are characterized for operation from 0°C to 70°C.