Overview
The 74HCT123D/AU118 is a dual retriggerable monostable multivibrator with reset, manufactured by Nexperia. This component is part of the 74HCT family and is designed to provide a versatile timing solution in various electronic circuits. It features a wide supply voltage range, low power dissipation, and high noise immunity, making it suitable for a broad range of applications.
Key Specifications
| Type number | VCC (V) | Logic switching levels | Output drive capability (mA) | tpd (ns) | Power dissipation considerations | Tamb (°C) | Rth(j-a) (K/W) | Ψth(j-top) (K/W) | Rth(j-c) (K/W) | Package name |
|---|---|---|---|---|---|---|---|---|---|---|
| 74HCT123D | 4.5 - 5.5 | TTL | ± 4 | 26 | Low | -40 ~ 125 | 90 | 8.3 | 49 | SO16 |
Key Features
- Wide supply voltage range from 2.0 V to 6.0 V
- CMOS low power dissipation
- High noise immunity
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level B
- Retriggerable for very long pulses up to 100% duty factor
- Direct reset terminates output pulse
- Schmitt-trigger action on all inputs except for the reset input
- ESD protection: HBM ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V
- Multiple package options, including SO16
- Specified from -40 °C to +85 °C and from -40 °C to +125 °C
Applications
The 74HCT123D/AU118 is widely used in various electronic systems requiring timing and pulse generation. These include:
- Microprocessors and computer systems
- Frequency counters and digital signal processors
- Timing and clock circuits
- Automotive and industrial control systems
- Consumer electronics and telecommunications equipment
Q & A
- What is the primary function of the 74HCT123D/AU118?
The primary function is to act as a dual retriggerable monostable multivibrator with reset.
- What is the supply voltage range for the 74HCT123D/AU118?
The supply voltage range is from 2.0 V to 6.0 V.
- What are the logic switching levels for the 74HCT123D?
The logic switching levels are TTL (Transistor-Transistor Logic) levels.
- How is the output pulse width controlled in the 74HCT123D/AU118?
The output pulse width is programmed by selection of external components (REXT and CEXT).
- What is the propagation delay time for the 74HCT123D?
The propagation delay time is approximately 26 ns.
- Does the 74HCT123D/AU118 have ESD protection?
- What package options are available for the 74HCT123D/AU118?
It is available in SO16 (Small Outline 16 leads) package among others.
- What is the operating temperature range for the 74HCT123D/AU118?
The operating temperature range is from -40 °C to +125 °C.
- How does the Schmitt-trigger action benefit the 74HCT123D/AU118?
The Schmitt-trigger action makes the circuit highly tolerant to slower input rise and fall times, enhancing noise immunity.
- Can the output pulse be terminated at any time in the 74HCT123D/AU118?
