Overview
The SN74121NSR is a monostable multivibrator integrated circuit produced by Texas Instruments. It belongs to the 7400 series and is designed for various timing and pulse generation applications. This IC features dual negative-transition-triggered inputs and a single positive-transition-triggered input that can be used as an inhibit input. The device provides complementary output pulses and is known for its jitter-free operation and high noise immunity.
Key Specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Part Number | SN74121NSR |
| Series | 7400 |
| Logic Type | Monostable |
| Independent Circuits | 2 |
| Schmitt Trigger Input | No |
| Propagation Delay | 45ns |
| Current - Output High, Low | 400µA, 16mA |
| Voltage - Supply | 4.75 V ~ 5.25 V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
| Package / Case | 14-SOIC (0.209", 5.30mm Width) |
Key Features
- Programmable output pulse width with external resistors and capacitors, ranging from 40 nanoseconds to 28 seconds.
- Internal compensation for virtual temperature independence, ensuring pulse width stability.
- Jitter-free operation up to 90% duty cycle, providing reliable timing signals.
- Inhibit capability, allowing for control over the timing circuit.
- Schmitt-trigger input circuitry for the B input, offering excellent noise immunity.
- TTL compatible output rise and fall times, independent of pulse length.
Applications
The SN74121NSR is suitable for a variety of applications requiring precise timing and pulse generation, such as:
- Timing circuits in digital systems.
- Pulse stretching and shaping.
- Reset signal generation in digital circuits.
- Noise filtering and signal conditioning.
- Automotive and industrial control systems where reliable timing is crucial.
Q & A
- What is the primary function of the SN74121NSR IC?
The SN74121NSR is a monostable multivibrator, which generates a single output pulse in response to an input trigger.
- What is the range of the output pulse width for the SN74121NSR?
The output pulse width can be varied from 40 nanoseconds to 28 seconds using external timing components.
- What type of input triggering does the SN74121NSR support?
The IC supports dual negative-transition-triggered inputs and a single positive-transition-triggered input that can be used as an inhibit input.
- What is the operating temperature range of the SN74121NSR?
The operating temperature range is from 0°C to 70°C.
- What is the supply voltage range for the SN74121NSR?
The supply voltage range is from 4.75 V to 5.25 V.
- Does the SN74121NSR have Schmitt-trigger inputs?
No, the SN74121NSR does not have Schmitt-trigger inputs, but it does have Schmitt-trigger-like input circuitry for noise immunity.
- What is the propagation delay of the SN74121NSR?
The propagation delay is approximately 45 nanoseconds.
- How many independent circuits are there in the SN74121NSR?
There are 2 independent circuits in the SN74121NSR.
- What is the current output range for the SN74121NSR?
The current output range is 400µA for high output and 16mA for low output.
- Is the SN74121NSR RoHS compliant?
