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SN74LS74N

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Manufacturer Part Number: SN74LS74N
Brand: HLF
DateCode: 18+
Package / Case: DIP14
Category: Integrated Circuits (ICs)
Warranty: 100% Perfect Functions

Model comparison: SN74LS74N vs XD74LS74 comparison

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The parameters and performance indicators of this product are sourced from the internet. In case of discrepancies, please refer to the manufacturer's technical specifications!！

Product Attributes

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	Vcc	Operating	4.75		5.25	V
Input Voltage (High Level)	VIH		2.0			V
Input Voltage (Low Level)	VIL				0.8	V
Output Voltage (High Level)	VOH	IC = -0.4mA	2.7			V
Output Voltage (Low Level)	VOL	IC = 16mA			0.5	V
Propagation Delay Time	tpd	Vcc = 5V		22		ns
Power Dissipation	PD	Per Package			100	mW

Instructions for SN74LS74N

Power Supply:
- Ensure the supply voltage (Vcc) is within the range of 4.75V to 5.25V to avoid damage and ensure proper operation.
Input Levels:
- For a valid high input, the voltage should be at least 2.0V.
- For a valid low input, the voltage should not exceed 0.8V.
Output Levels:
- When the output is high, it should provide at least 2.7V when sourcing up to 0.4mA.
- When the output is low, it should not exceed 0.5V when sinking up to 16mA.
Propagation Delay:
- The typical propagation delay time (tpd) is 22ns under standard conditions with Vcc at 5V.
Power Dissipation:
- Keep the power dissipation per package below 100mW to prevent overheating and potential damage.
Handling:
- Handle the device with care to avoid static damage. Use appropriate ESD protection measures.
Application Notes:
- This device is suitable for applications requiring D-type flip-flops with preset and clear functions. It can be used in various digital circuits for data storage and signal processing.

(For reference only)

Description of SN74LS74N

The SN74LS74N is a dual D-type flip-flop integrated circuit (IC) that operates with positive-edge triggering. It contains two independent D flip-flops, each equipped with complementary outputs, preset, and clear functionalities. This IC is widely used in digital circuits for applications such as data storage, counters, shift registers, and state machines.

Key Features:

Dual D-type flip-flops with individual controls.
Positive-edge clock triggering.
Asynchronous active-low preset and clear inputs.
Operating voltage range: 4.75V to 5.25V.
Maximum propagation delay: 22ns (typical).
Output current capability: ±8mA.

Parameters of SN74LS74N

Parameter	Value
Logic Type	D Flip-Flop
Number of Elements	2
Bits per Element	1
Supply Voltage Range	4.75V to 5.25V
Propagation Delay (Typical)	22ns
Clock Frequency	Up to 33 MHz
Input Current	±1mA
Output Current	±8mA
Package Type	14-Pin DIP (Dual In-line Package)
Operating Temperature Range	0°C to 70°C
Trigger Type	Positive Edge
Clear/Preset Functionality	Asynchronous, Active Low

Pin Configuration

The SN74LS74N uses a 14-pin DIP package with the following pinout:

Pin 1 (Q1): Output of the first D flip-flop.
Pin 2 (D1): Data input of the first D flip-flop.
Pin 3 (CLK1): Clock input of the first D flip-flop (positive edge-triggered).
Pin 4 (~CLR1): Asynchronous clear input of the first D flip-flop (active low).
Pin 7 (GND): Ground connection.
Pin 14 (VCC): Power supply connection (+5V).
Pin 13 (~CLR2): Asynchronous clear input of the second D flip-flop (active low).
Pin 12 (CLK2): Clock input of the second D flip-flop (positive edge-triggered).
Pin 11 (D2): Data input of the second D flip-flop.
Pin 10 (Q2): Output of the second D flip-flop.

Applications

The SN74LS74N is commonly used in:

Data registers for temporary storage.
Synchronization circuits for aligning multiple signals.
Counter designs when combined with other logic chips.
State machine implementations as a state storage unit.

Usage Notes

When using the SN74LS74N, ensure proper connections for VCC and GND to avoid damage. Use pull-up resistors on asynchronous clear pins if necessary to prevent unintended triggering. Always verify the circuit design using simulation tools before implementation.

QUANTITY	UNIT PRICE	PLUS UNIT PRICE	TOTAL PRICE
≥1:	US $0.13046	US $0.11742	US $0.11742

Substitute (equivalent) Product

Substitute Product	Description
CD54/74HCT74	Dual D-Type Flip-Flop with Set and Reset; features high-speed CMOS logic.
MC74HCT74A	Dual D Flip-Flop with Preset and Clear; compatible with TTL-level inputs.
74HC74	High-speed Si-gate CMOS devices; Dual positive edge-triggered D-type flip-flop.
SN74HCT74N	Dual D-type flip-flops with preset and clear in high-performance, low-power technology.
MC74LVX74	Low-voltage, dual D-type flip-flop with direct clear and direct set.

Product Usage

The SN74LS74N is a dual D-type positive-edge-triggered flip-flop with preset, clear, and complementary (Q and Q') outputs. This versatile IC is used in a variety of digital circuits to store and manipulate data. Here are some common applications and circuits where the SN74LS74N can be used:

Data Storage and Transfer:
- Shift Registers: Used to create registers to shift data in serial in, parallel out (SIPO) or parallel in, serial out (PISO) configurations.
- Data Latches: To hold data from a data bus until the system is ready to use it.
Frequency Division:
- Frequency Dividers: When cascaded, these flip-flops can divide the frequency of an input clock signal, commonly used in clock generation and timing applications.
State Machines:
- Counters: Used in binary counters, where each flip-flop represents a binary digit.
- Finite State Machines (FSM): Employed in the design of FSMs for controlling systems, implementing simple logic sequences, or handling protocols.
Control Logic:
- Debouncing Circuits: Used to debounce noisy signals from mechanical switches.
- Pulse Generators: Can create precise pulse timing and width by combining them with other timing elements.
Signal Synchronization and De-synchronization:
- Synchronizers: To eliminate metastability problems when passing signals between different clock domains.
- Edge Detectors: By configuring the flip-flop to detect rising edges of clock or data signals.
Memory Elements:
- Static RAM Cells: The basis for simple memory storage elements where stable data storage is required.

Example Circuit: Toggle Flip-Flop

A common use case is to create a toggle flip-flop (T-type flip-flop) using a D flip-flop from an SN74LS74N IC.

Steps to Create a Toggle Flip-Flop:

Connect the D input to the Q' (complementary output).
Connect the clock input to your clock signal.
Use the Q and Q' outputs as your toggle outputs.

In this configuration, each rising edge of the clock input will toggle the state of the Q output, effectively creating a divide-by-2 frequency divider.

Basic Wiring for a Single SN74LS74N Flip-Flop:

Vcc Pin (14): Connected to the positive supply voltage (typically 5V).
GND Pin (7): Connected to ground.
Data (D) Pin: Connected to your data source.
Clock (CLK) Pin: Connected to your clock source.
Preset (PRE) and Clear (CLR): These pins are often tied to a high logic level for normal operation but can be used to set or reset the flip-flop state.

Make sure to refer to the SN74LS74N datasheet for precise pin numbers and additional details on its electrical characteristics and constraints.

By incorporating the SN74LS74N in the above configurations, you can implement a wide range of digital functionalities central to various electronic systems.

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SN74LS74N

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