仕様
| 属性 | 値 |
| Package / Case | Tube |
| Series | 7400 |
| Part Status | Active |
| Logic Type | Monostable |
| Independent Circuits | 2 |
| Schmitt Trigger Input | No |
| Propagation Delay | 45 ns |
| Current - Output High Low | 400µA, 16mA |
| Voltage - Supply | 4.75 V ~ 5.25 V |
| Operating Temperature | 0°C ~ 70°C |
| Mounting Type | Surface Mount |
概要
Description
The SN74121D is a monostable multivibrator from the 7400 series of TTL logic integrated circuits. It is designed to generate a single output pulse of a specified duration in response to a triggering event at its input. The output pulse width is determined by external components, typically a resistor and a capacitor connected to specific pins, allowing for flexibility in timing applications.
Key features of the SN74121D include:
1. Edge-Triggered: It can be triggered on a positive or negative edge, giving it versatility in various applications.
2. Retriggerable: The output pulse duration can be extended by retriggering before the pulse completes, which is useful in certain timing and synchronization applications.
3. TTL-Compatible: As part of the 7400 series, it is compatible with other TTL logic devices, facilitating integration into existing digital circuits.
4. Wide Applications: Commonly used in pulse generation, timing delays, and waveform shaping.
Overall, the SN74121D is a reliable choice for applications requiring precise timing control in digital circuits.
Key features of the SN74121D include:
1. Edge-Triggered: It can be triggered on a positive or negative edge, giving it versatility in various applications.
2. Retriggerable: The output pulse duration can be extended by retriggering before the pulse completes, which is useful in certain timing and synchronization applications.
3. TTL-Compatible: As part of the 7400 series, it is compatible with other TTL logic devices, facilitating integration into existing digital circuits.
4. Wide Applications: Commonly used in pulse generation, timing delays, and waveform shaping.
Overall, the SN74121D is a reliable choice for applications requiring precise timing control in digital circuits.
Equivalent
The SN74121D is a monostable multivibrator. Equivalent products include:
1. 74LS121 from various manufacturers like Texas Instruments and ON Semiconductor.
2. NTE74121 from NTE Electronics.
3. CD54/74HC123, a similar dual version, but note the differences in timing and logic families.
4. MC14528 from ON Semiconductor, a newer CMOS alternative.
Ensure compatibility with your specific application, as differences in logic family (TTL vs. CMOS) and electrical characteristics may require adjustments.
1. 74LS121 from various manufacturers like Texas Instruments and ON Semiconductor.
2. NTE74121 from NTE Electronics.
3. CD54/74HC123, a similar dual version, but note the differences in timing and logic families.
4. MC14528 from ON Semiconductor, a newer CMOS alternative.
Ensure compatibility with your specific application, as differences in logic family (TTL vs. CMOS) and electrical characteristics may require adjustments.
Features
The SN74121D is a monostable multivibrator integrated circuit. Key features include:
1. Retriggerable and Non-retriggerable Modes: It can be configured to operate in either mode, providing flexibility for different application needs.
2. Wide Supply Voltage Range: Typically operates between 4.5V and 5.5V, compatible with TTL logic levels.
3. Adjustable Pulse Width: The output pulse width can be adjusted using external resistor-capacitor (RC) components, allowing for precise timing control.
4. Propagation Delay and Transition Times: Offers consistent propagation delay and fast transition times suitable for high-speed applications.
5. Current Drive Capability: The output can source or sink current sufficient to drive various loads, compatible with TTL outputs.
6. Temperature Range: Designed for operation over a wide temperature range, enhancing reliability in different environments.
7. Package: Available in a small-outline package, suitable for space-constrained circuit designs.
These features make the SN74121D suitable for timing applications, pulse shaping, and generating precise time delays in digital circuits.
1. Retriggerable and Non-retriggerable Modes: It can be configured to operate in either mode, providing flexibility for different application needs.
2. Wide Supply Voltage Range: Typically operates between 4.5V and 5.5V, compatible with TTL logic levels.
3. Adjustable Pulse Width: The output pulse width can be adjusted using external resistor-capacitor (RC) components, allowing for precise timing control.
4. Propagation Delay and Transition Times: Offers consistent propagation delay and fast transition times suitable for high-speed applications.
5. Current Drive Capability: The output can source or sink current sufficient to drive various loads, compatible with TTL outputs.
6. Temperature Range: Designed for operation over a wide temperature range, enhancing reliability in different environments.
7. Package: Available in a small-outline package, suitable for space-constrained circuit designs.
These features make the SN74121D suitable for timing applications, pulse shaping, and generating precise time delays in digital circuits.
Pinout
The SN74121D is a monostable multivibrator IC with a dual-in-line package, typically featuring 14 pins. Here is a concise overview of its pin functions:
1. Pin 1 (B): Trigger input
2. Pin 2 (A): Trigger input
3. Pin 3 (CLR): Active-low clear input
4. Pin 4 (Q): Output
5. Pin 5 (Q̅): Complementary output
6. Pin 6 (Cext): External capacitor connection
7. Pin 7 (GND): Ground
8. Pin 8 (Rext/Cext): External resistor/capacitor connection
9. Pin 9 (Rext): External resistor connection
10. Pin 10: No Connection
11. Pin 11: No Connection
12. Pin 12: No Connection
13. Pin 13 (Vcc): Positive supply voltage
14. Pin 14 (Cext): External capacitor connection
The SN74121D is used for generating precise time delays or pulse widths in response to a trigger input, with timing controlled by external resistor (Rext) and capacitor (Cext) components.
1. Pin 1 (B): Trigger input
2. Pin 2 (A): Trigger input
3. Pin 3 (CLR): Active-low clear input
4. Pin 4 (Q): Output
5. Pin 5 (Q̅): Complementary output
6. Pin 6 (Cext): External capacitor connection
7. Pin 7 (GND): Ground
8. Pin 8 (Rext/Cext): External resistor/capacitor connection
9. Pin 9 (Rext): External resistor connection
10. Pin 10: No Connection
11. Pin 11: No Connection
12. Pin 12: No Connection
13. Pin 13 (Vcc): Positive supply voltage
14. Pin 14 (Cext): External capacitor connection
The SN74121D is used for generating precise time delays or pulse widths in response to a trigger input, with timing controlled by external resistor (Rext) and capacitor (Cext) components.
Manufacturer
The SN74121D is manufactured by Texas Instruments, a global semiconductor company. Texas Instruments (TI) is renowned for its design and production of a wide range of semiconductor and integrated circuit technologies. The company is headquartered in Dallas, Texas, and is one of the largest manufacturers of analog electronics components and embedded processors in the world. TI serves a broad array of industries, including automotive, industrial, consumer electronics, telecommunications, and more. The company is known for its focus on innovation, design, and engineering excellence, and it provides a vast portfolio of products that include amplifiers, data converters, power management devices, and digital signal processors, among others. Texas Instruments plays a crucial role in the electronics supply chain, offering solutions that help companies create advanced, efficient, and reliable electronic systems.
Application
The SN74121D is a monostable multivibrator used in timing applications. Its primary applications include pulse generation, time delay circuits, and frequency division. It is often utilized in digital circuits to create a precise time delay or to convert digital signals into specific pulse widths. This component is valuable in debounce circuits, where it helps stabilize mechanical switch signals by eliminating noise. Additionally, it can be used in oscillator circuits and as a trigger for flip-flops in sequential logic systems. Its versatility makes it suitable for various electronic applications requiring precise timing control.
Package
The SN74121D is a monostable multivibrator IC available in a SOIC-14 package, which is a surface-mount package type with 14 pins. It is designed for use in a wide range of digital applications.
