74HC74 Dual D Flip-Flop: Datasheet Analysis, Pinout, and Diagrams

Nov29

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The 74HC74 dual positive edge-triggered D-type flip-flop is basic in digital circuits, renowned for its precision in data storage and transmission. This article examines its dangerous features and functions, underlining separate inputs for data, clock, set, and reset that enhance its versatility and efficiency. It also covers how its outputs, Q and Q', facilitate complex designs, ensuring reliable and flexible digital systems. Learn more about the capabilities of the 74HC74 in enhancing digital circuitry.

Catalog

1. Overview of the 74HC74

2. Pinout of 74HC74

3. Functional Pinout Analysis of 74HC74

4. CAD Model of 74HC74

5. Technical Specifications

6. Features of the 74HC74

7. Applications of 74HC74

8. 74HC74 Circuit Actives

9. Comparable Parts with Specifications

10. Dimensions of the 74HC74 Package

11. Manufacturer Profile

74HC74

Overview of the 74HC74

The 74HC74 is a dual positive edge-triggered D-type flip-flop with separate inputs for data (nD), clock (nCP), set (nSD), and reset (nRD), as well as complementary outputs nQ and nQ. It is designed for compatibility with standard CMOS outputs and can interface with LSTTL outputs through the use of pull-up resistors.

74HC74 Logic Diagram

Pinout of 74HC74

Functional Pinout Analysis of 74HC74

74HC74 Functional Pinout

CAD Model of 74HC74

Technical Specifications

Technical specifications, attributes, parameters, and components of the ON Semiconductor 74HC74DR2G :

Type	Parameter
Mount	Surface Mount
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154, 3.90mm Width)
Number of Pins	14
Clock-Edge Trigger Type	Positive Edge
Operating Temperature	-55°C to 125°C (TA)
Packaging	Tape & Reel (TR)
Series	74HC
JESD-609 Code	e3
Part Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	14
Type	D-Type
Terminal Finish	Tin (Sn)
Packing Method	Tape and Reel
Voltage - Supply	2V to 6V
Terminal Position	DUAL
Terminal Form	GULL WING
Peak Reflow Temperature (°C)	260
Supply Voltage	3V
REACH Compliance Code	Unknown
Time at Peak Reflow Temperature	40 seconds
Base Part Number	74HC74
Function	Set (Preset) and Reset
Qualification Status	Not Qualified
Output Type	Differential
Polarity	Non-Inverting
Supply Voltage - Max (Vsup)	6V
Supply Voltage - Min (Vsup)	2V
Number of Circuits	2
Load Capacitance	50pF
Output Current	5.2mA
Clock Frequency	28MHz
Propagation Delay	100ns
Turn On Delay Time	21ns
Family	HC/UH
Logic Function	AND, D-Type
Current - Quiescent (Iq)	2μA
Max I(ol)	0.004A
Number of Bits per Element	1
Max Propagation Delay	17ns @ 6V, 50pF
Trigger Type	Positive Edge
Input Capacitance	10pF
Number of Output Lines	1
Length	8.65mm
Width	3.9mm
RoHS Status	RoHS Compliant
Lead Free	Lead Free

Features of the 74HC74

Parameter	Details
Output Drive Capability	10 LSTTL Loads
Direct Interface Compatibility	Outputs directly interface to CMOS, NMOS, and TTL
Operating Voltage Range	2.0 to 6.0 V
Low Input Current	1.0 A
High Noise Immunity	Characteristic of CMOS Devices
Compliance	In compliance with JEDEC Standard No. 7A Requirements
ESD Performance	HBM 2000 V; Machine Model 200 V
Chip Complexity	128 FETs or 32 Equivalent Gates
Pb-Free Packages	Available

Applications of 74HC74

Counters and Frequency Dividers

In the digital electronics landscape, the 74HC74 flip-flop proves instrumental in crafting counters and frequency dividers. The devices capitalize on the flip-flop's capacity to switch states, allowing them to effectively count pulses and divide frequencies.

Shift Registers

Shift registers derive notable benefits from the 74HC74's capability to retain and transfer data sequentially. A line-up of flip-flops enables shift registers to perform tasks such as serial-to-parallel conversion and data storage, serving a wide range of applications.

Storage Registers

The 74HC74 plays a main role in storage registers by maintaining data states until a signal introduces changes. This function supports systems that demand consistent data retrieval or temporary data hold, as seen in memory units within microcontrollers.

74HC74 Circuit Actives

The datasheet specifies that the IC's power supply, VDD, varies from 0 to +7V, as illustrated in the snapshot below. To manage the supply and DC output voltage, the source was restricted to 5V using an LED on the output. An LM7805 regulator was employed to control the voltage of the LED.

74HC74 Circuit Actives

Symbol	Parameter	Value	Unit
Vcc	DC Supply Voltage (Referenced to GND)	-0.5 to +7.0	V
Vin	DC Input Voltage (Referenced to GND)	-1.5 to Vcc + 1.5	V
Vout	DC Output Voltage (Referenced to GND)	-0.5 to Vcc + 0.5	V
Iin	DC Input Current, per Pin	±20	mA
Iout	DC Output Current, per Pin	±25	mA
Icc	DC Supply Current, Vcc and GND Pins	±50	mA

Comparable Parts with Specifications

Parameters	74HC74DR2G	SN74HC74D	MC74HC74ADR2G	MC74HC74ADG	MC74HC74AF
Manufacturer	ON Semiconductor	Texas Instruments	ON Semiconductor	ON Semiconductor	ON Semiconductor
Package / Case	14-SOIC (0.154, 3.90mm Width)	14-SOIC (0.154, 3.90mm Width)	14-SOIC (0.154, 3.90mm Width)	14-SOIC (0.154, 3.90mm Width)	14-SOIC (0.209, 5.30mm Width)
Number of Pins	14	14	14	14	14
Logic Function	AND, D-Type	AND, D-Type, Flip-Flop	AND, D-Type, Flip-Flop	AND, D-Type, Flip-Flop	AND, D-Type, Flip-Flop
Number of Bits per Element	1	1	1	1	-
Propagation Delay	100 ns	160 ns	160 ns	15 ns	100 ns
Clock Edge Trigger Type	Positive Edge	Positive Edge	Positive Edge	Positive Edge	Positive Edge
Supply Voltage	3 V	3 V	3 V	5 V	3 V
Technology	CMOS	CMOS	CMOS	CMOS	CMOS

Dimensions of the 74HC74 Package

Manufacturer Profile

ON Semiconductor is a leader in energy-efficient technologies, notably impacting the automotive and aerospace industries with its advanced semiconductor solutions. The company is committed to sustainable practices, helping to reduce carbon footprints and meet global sustainability goals. Strategic alliances bolster their innovative capabilities, positioning ON Semiconductor at the forefront of technological advancements. Their robust product line, including the 74HC74, which operates with a power supply range of 0 to +7V, showcases their commitment to versatile and high-performance solutions.

Datasheet PDF

Frequently Asked Questions [FAQ]

1. Can you explain the functioning of the 74HC74?

The 74HC74 has the same pinout as the LS74 and is compatible with standard CMOS outputs. With the addition of pull-up resistors, it can also work with LSTTL outputs. This device includes two D-type flip-flops, each with separate Set, Reset, and Clock inputs.

2. What purpose does a flip-flop serve in electronics?

A flip-flop, or latch, is a type of circuit used in electronics that maintains one of two stable states, effectively storing state information. This bistable multivibrator can switch states through signals received at its control inputs and has one or two outputs.