Overview
The SN74LS122DRE4 is a retriggerable monostable multivibrator produced by Texas Instruments. This integrated circuit is part of the 74LS series, known for its low power consumption and high noise immunity. The SN74LS122 is designed to generate a single output pulse of a fixed duration in response to an input trigger signal. It features internal timing resistors, allowing it to be used with just an external capacitor if desired, and it supports both active-high and active-low gated logic inputs.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC (D) |
| Pins | 14 |
| Operating Temperature Range (°C) | 0 to 70 |
| Package Quantity | 2500 (per reel) |
| Lead Finish/Ball Material | RoHS & Green |
| Moisture Sensitivity Level (MSL) | Level-1-260C-UNLIM |
Key Features
- D-C triggered from active-high or active-low gated logic inputs
- Retriggerable for very long output pulses, up to 100% duty cycle
- Overriding clear terminates output pulse
- Internal timing resistors allow use with only an external capacitor if desired
- Schmitt hysteresis ensures jitter-free triggering from the B input with slow transition rates
Applications
The SN74LS122DRE4 is suitable for various applications requiring precise timing and pulse generation, such as:
- Timing circuits in digital systems
- Pulse stretching and shaping
- Debouncing switches
- Generating clock signals
- Other applications requiring monostable multivibrators
Q & A
- What is the SN74LS122DRE4 used for? The SN74LS122DRE4 is used as a retriggerable monostable multivibrator to generate single output pulses of fixed duration in response to input trigger signals.
- What are the key features of the SN74LS122DRE4? Key features include D-C triggering from active-high or active-low inputs, retriggerability for long output pulses, overriding clear, and internal timing resistors.
- What is the operating temperature range of the SN74LS122DRE4? The operating temperature range is from 0°C to 70°C.
- What package types are available for the SN74LS122? The SN74LS122 is available in SOIC (D), PDIP (N), and SOP (NS) packages.
- Is the SN74LS122DRE4 RoHS compliant? Yes, the SN74LS122DRE4 is RoHS & Green compliant.
- How many pins does the SN74LS122DRE4 have? The SN74LS122DRE4 has 14 pins.
- What is the purpose of the internal timing resistors in the SN74LS122? The internal timing resistors allow the circuit to be used with only an external capacitor if desired, simplifying the circuit design.
- Can the SN74LS122DRE4 be retriggered? Yes, the SN74LS122DRE4 is retriggerable, allowing the output pulse duration to be extended by retriggering the gated inputs.
- How does the overriding clear function work on the SN74LS122DRE4? The overriding clear function terminates the output pulse, allowing for precise control over the pulse duration.
- What is the significance of Schmitt hysteresis in the SN74LS122DRE4? Schmitt hysteresis ensures jitter-free triggering from the B input even with slow transition rates.
