The 74AHC123 is a high-speed silicon-gate CMOS device. It is a dual retriggerable monostable multivibrator.
The device has three ways of output pulse-duration control. First, when nA input sets low, the nB input goes high. Second, when nB input sets high, the nA input goes low. Third, when nA input sets low and nB input sets high, the nRD input goes high. Figure 3 shows the output pulse control using retrigger pulse and Figure 4 illustrates the output pulse control using reset input nRD.
The output pulse-duration can be set through the selection of external resistance (RPROG) and capacitance (CPROG) values. All the inputs have Schmitt-trigger actions with sufficient hysteresis to handle slow input rise and fall times.
When started, the gated active low-going edge (nA) input or the active high-going edge (nB) input can help to prolong the basic output pulse-duration. Through it, an ideal output pulse period (nQ = high, nQ = low) can be achieved. Pulse duration can be reduced by a low-going edge on nRD input.
Supply Voltage Range: 2.0V to 5.5V
Inputs Accept Voltages Higher than the Supply Voltage
All Inputs with Schmitt-Trigger Actions
Triggered from Gated Active High or Active Low Edge Inputs
Retriggerable for Very Long Pulses
Direct Reset Stops Output Pulse
CMOS Level Inputs
-40℃ to +125℃ Operating Temperature Range
Available in Green SOIC-16 and TSSOP-16 Packages
