Overview
The 74HC123DB,112, produced by Nexperia USA Inc., is a dual retriggerable monostable multivibrator with reset. This integrated circuit is part of the 74HC/74HCT family and is designed to generate a single pulse of a fixed duration in response to a trigger signal. The output pulse width can be programmed using external components (REXT and CEXT), and the pulse can be extended by retriggering the inputs. The device also features a direct reset input to terminate the output pulse at any time.
Key Specifications
| Parameter | Description |
|---|---|
| Type Number | 74HC123DB,112 |
| Package | SSOP16 (SOT338-1) |
| Supply Voltage Range | 2.0 V to 6.0 V |
| Input Levels | CMOS level for 74HC123, TTL level for 74HCT123 |
| Propagation Delay | 65 ns (typical) |
| Quiescent Current | 8 μA (typical at 5 V) |
| Operating Temperature Range | -40 °C to +85 °C and -40 °C to +125 °C |
| ESD Protection | HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V, CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V |
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
- Complies with JEDEC standards: JESD8C (2.7 V to 3.6 V) and JESD7A (2.0 V to 6.0 V)
- DC triggered from active HIGH or active LOW inputs
- 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
- Multiple package options available
Applications
- Timing and pulse generation in digital circuits
- Signal processing and conditioning
- Automotive and industrial control systems
- Consumer electronics requiring precise timing signals
- Clock and timing circuits in various electronic devices
Q & A
- What is the primary function of the 74HC123DB,112?
The primary function is to act as a dual retriggerable monostable multivibrator with reset, generating a single pulse of a fixed duration in response to a trigger signal.
- What is the supply voltage range for the 74HC123DB,112?
The supply voltage range is from 2.0 V to 6.0 V.
- What types of input levels does the 74HC123DB support?
The 74HC123 supports CMOS input levels, while the 74HCT123 supports TTL input levels.
- How can the output pulse width be adjusted?
The output pulse width can be programmed using external components (REXT and CEXT).
- What is the significance of the Schmitt-trigger action on the inputs?
The Schmitt-trigger action makes the circuit highly tolerant to slower input rise and fall times, improving noise immunity.
- How can the output pulse be terminated?
The output pulse can be terminated at any time by a LOW-going edge on the reset input (nRD).
- What is the operating temperature range for the 74HC123DB,112?
The operating temperature range is from -40 °C to +85 °C and from -40 °C to +125 °C.
- What kind of ESD protection does the 74HC123DB,112 have?
The device has HBM: ANSI/ESDA/JEDEC JS-001 class 2 exceeds 2000 V and CDM: ANSI/ESDA/JEDEC JS-002 class C3 exceeds 1000 V ESD protection.
- What are some common applications of the 74HC123DB,112?
Common applications include timing and pulse generation in digital circuits, signal processing, automotive and industrial control systems, and consumer electronics.
- Is the 74HC123DB,112 RoHS compliant?
