74LV123

General description

The 74LV123 is a low-voltage Si-gate CMOS device and is pin and function compatible with the 74HC123; 74HCT123. It is a dual retriggerable monostable multivibrator which uses three methods to control the output pulse width:

1. The basic pulse time is programmed by the selection of an external resistor (R_EXT) and capacitor (C_EXT). These are normally connected as shown in Figure 9.
2. Once triggered, the basic output pulse width may be extended by retriggering the gated active LOW-going edge input (nA) or the active HIGH-going edge input (nB). By repeating this process, the output pulse period (nQ = HIGH, nQ = LOW) can be made as long as desired (see Figure 12).
3. Alternatively, an output delay can be terminated at any time by a LOW-going edge on input nRD, which also inhibits the triggering (see Figure 13).

Schmitt-trigger action in the nA and nB inputs makes the circuit highly tolerant of slower input rise and fall times.

Features

• Optimized for low-voltage applications: 1.0 V to 5.5 V
• Accepts TTL input levels between V_CC = 2.7 V and V_CC = 3.6 V
• Typical output ground bounce: < 0.8 V at V_CC = 3.3 V and T_amb = 25 Cel
• Typical HIGH-level output voltage (V_OH) undershoot: > 2 V at V_CC = 3.3 V and T_amb = 25 Cel
• DC triggered from active HIGH or active LOW inputs
• Retriggerable for very long pulses up to 100 pct duty factor
• Direct reset terminates output pulses
• Schmitt-trigger action on all inputs except for the reset input

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Block diagrams/pinning

Parametrics/similar products

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74LV123 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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