Overview
The SN74LS122DR is a retriggerable monostable multivibrator produced by Texas Instruments. This component is part of the SN74LS series, known for its low-power Schottky logic family. The SN74LS122DR is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) package, making it suitable for a variety of applications requiring precise timing and pulse generation.
The device features output pulse-duration control through three primary methods: external resistance and capacitance values, internal timing resistors, and retriggering or early clear inputs. This flexibility allows for the generation of output pulses with durations that can be extended or reduced as needed.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SOIC (D) |
| Pins | 14 |
| Operating Supply Voltage | 5 V |
| Operating Temperature Range (°C) | 0 to 70 |
| Package Quantity (per reel) | 2500 |
| RoHS Compliance | Yes |
| 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 the circuit to be used with only an external capacitor if desired.
- Schmitt hysteresis ensures jitter-free triggering from the B input with transition rates as slow as 0.1 millivolt per nanosecond.
Applications
The SN74LS122DR is versatile and can be used in a variety of applications, including:
- Pulse generation and shaping in digital circuits.
- Timing and delay circuits.
- Sequential logic circuits requiring precise timing control.
- Automotive and industrial control systems where reliable timing is crucial.
Q & A
- What is the package type of the SN74LS122DR?
The SN74LS122DR is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) package.
- What is the operating supply voltage of the SN74LS122DR?
The operating supply voltage is 5 V.
- What is the operating temperature range of the SN74LS122DR?
The operating temperature range is from 0°C to 70°C.
- Can the SN74LS122DR be triggered from both active-high and active-low inputs?
Yes, the SN74LS122DR can be triggered from both active-high and active-low gated logic inputs.
- How can the output pulse duration be controlled in the SN74LS122DR?
The output pulse duration can be controlled through external resistance and capacitance values, internal timing resistors, and retriggering or early clear inputs.
- Is the SN74LS122DR RoHS compliant?
Yes, the SN74LS122DR is RoHS compliant.
- What is the moisture sensitivity level (MSL) of the SN74LS122DR?
The MSL is Level-1-260C-UNLIM.
- Can the SN74LS122DR generate output pulses with up to 100% duty cycle?
Yes, the SN74LS122DR can generate output pulses with up to 100% duty cycle through retriggering.
- What is the purpose of the internal timing resistors in the SN74LS122DR?
The internal timing resistors allow the circuit to be used with only an external capacitor if desired.
- How does the Schmitt hysteresis in the SN74LS122DR affect its performance?
The Schmitt hysteresis ensures jitter-free triggering from the B input with transition rates as slow as 0.1 millivolt per nanosecond.
