SN74LVC1G79DRLR: Single-channel edge-triggered D-type flip-flop, suitable for low-voltage logic systems
Product Introduction
SN74LVC1G79DRLR is a high-performance, low-power single-channel D-type edge-triggered flip-flop that supports asynchronous clear function. The device operates in the range of 1.65V to 5.5V, is designed using a standard CMOS LVC process, has TTL-level compatible inputs, and has a push-pull output structure that supports 24mA high drive capability, making it suitable for applications such as storage status, delayed latching, frequency division, or timing control.
Key performance parameters
Parameters Specifications
Function Edge-triggered D-type flip-flop with asynchronous clear
Input trigger Rising edge trigger to store the state of D
Supply voltage range 1.65V – 5.5V
Input level compatible Supports 5V TTL input
Output drive capability Maximum 24mA push-pull output
Quiescent current range Several microamperes to tens of microamperes, low power consumption
Clear signal Low level valid, asynchronous clear output
Data retention D must remain stable before the rising edge of CLK
Packaging Small packages such as SOT-23-5 / SC70-5
Function and feature highlights
Edge trigger structure: Sample the input D data only on the rising edge of CLK to reduce circuit noise and state drift.
Asynchronous clear function: When the clear pin is pulled low, the output is reset immediately without waiting for clock synchronization.
Wide voltage support: 1.65–5.5V universal power supply range, adapting to a variety of power supply design requirements.
TTL input compatibility: can directly accept 5V TTL input operation without additional level conversion.
High drive capability output: push-pull output supports 24mA strong drive, suitable for controlling indicator LEDs, audio signals or medium current loads.
Low power consumption: extremely low quiescent current, suitable for portable or energy-saving devices.
Small package: suitable for space-constrained embedded or wearable design boards.
Typical application scenarios
State register and latch: used to save the input signal state on the rising edge
Delay circuit: generate accurate digital timing delay pulse
Frequency divider: cooperate with feedback network to realize simple frequency division function
Signal synchronization: realize asynchronous synchronization between multiple clock domains
Hardware reset logic: cooperate with clear input to realize system reset mechanism
LED or buzzer drive: the output end can efficiently control small loads without additional drivers
Pin and function description (SOT-23-5/BGA-5)
Pin number Name Function description
1 CLEAR* Asynchronous clear (low active), reset output immediately 2 D Data input 3 CLK Clock signal input (rising edge trigger) 4 Q Non-reversing output 5 VCC / GND Power supply positive and negative poles (depending on the package)
PCB layout and design recommendations
Decoupling capacitor: Add a 0.1µF ceramic capacitor near VCC, and it is recommended to wire close to the pins. CLK signal processing: It is recommended to set the resistance value or RC filter to improve the anti-jitter capability and prevent false triggering. CLEAR pin wiring: If used for hard reset, it is recommended to wire it close to the system button or configure a pull-up resistor. Q output design: If used to drive LEDs or other indicators, a current limiting resistor can be added to the Q output. Package selection: Select SOT-23-5 or SC70-5 according to the PCB size, taking into account both installation and heat dissipation performance.
Compatible and alternative model recommendations
Model Feature Description
SN74LVC1G79DRLR Recommended model, with asynchronous clear, standard LVC process
SN74HC1G79 Same function but push-pull clear output, slightly higher temperature stability
SN74LVC1G374 Multi-channel D flip-flop, supporting eight-bit parallel latch
CD4013 Dual D flip-flop, suitable for low-speed large systems
MC14013 CMOS dual flip-flop, with additional inverting output capability
Summary
SN74LVC1G79DRLR is a simple, efficient and stable edge-triggered D flip-flop. Its asynchronous clearing, input compatibility, low power consumption and high driving capability make it highly adaptable in applications such as digital timing control, level isolation, and state storage. It is suitable for modern embedded and logic circuit designs that have strict requirements on volume, power consumption, and response time.
