on October 22th 149

What is the 74HC244?

The 74HC244 is a useful and versatile 8-bit buffer and line driver that offers 3-state outputs, which can be configured as either two 4-bit buffers or one 8-bit buffer. This flexibility, combined with its low power consumption and ability to handle a wide range of input voltages, makes it suitable for a variety of applications. In this article, you'll learn about the key features, applications, and technical details of the 74HC244, along with comparisons to similar components. This guide will provide you with a clear understanding of how the 74HC244 can fit into your projects.

Catalog

Overview of the 74HC244

The 74HC244 is a versatile 8-bit buffer and line driver, offering 3-state outputs that can be configured in two ways: either as two 4-bit buffers or as a single 8-bit buffer. This flexibility makes it useful for a variety of tasks. One of the device's strengths is its ability to handle a wide range of input voltages while consuming very little power. It’s designed to work efficiently in different setups where low current consumption is needed.

The 74HC244 has two output enable pins, labeled 1OE and 2OE, which control four outputs each. When either of these pins receives a HIGH signal, the corresponding outputs switch to a high-impedance state, effectively turning off those outputs. This feature is especially useful when you need to manage multiple circuits without interference. Additionally, the device has clamp diodes on the inputs, allowing you to use current-limiting resistors to handle voltages that go beyond the operating limit (VCC) of the chip. This gives the 74HC244 added protection and makes it more robust in various conditions.

74HC244 Pin Configuration

Symbol	Pin	Description
1OE, 2OE	1, 19	output enable input (active LOW)
1A0, 1A1, 1A2, 1A3	2, 4, 6, 8	data input
2Y0, 2Y1, 2Y2, 2Y3	3, 5, 7, 9	bus output
GND	10	ground (0 V)
2A0, 2A1, 2A2, 2A3	17, 15, 13, 11	data input
1Y0, 1Y1, 1Y2, 1Y3	18, 16, 14, 12	bus output
Vcc	20	supply voltage

74HC244 CAD Design

74HC244 Schematic Symbol

74HC244 PCB Footprint

74HC244 3D Representation

Key Features of the 74HC244

Lead-Free Design

The 74HC244 is manufactured using lead-free materials. This makes the component safer for both the environment and the people handling it, ensuring compliance with regulations that limit the use of harmful substances in electronics. If you're looking for components that align with modern environmental standards, this is an advantage.

Low Input Current

With an extremely low input current of 1.0 µA, the 74HC244 is designed to minimize power consumption. This feature is especially useful in systems where conserving energy is a priority, such as battery-powered devices or low-power applications. You can depend on this IC to help keep your overall system power requirements low.

Wide Supply Voltage Range

The device operates across a broad supply voltage range, from 2V to 6V. This flexibility allows you to use the 74HC244 in a wide variety of circuits and systems without needing specific or complex power supplies. It simplifies integration, whether you are working with low or medium voltage systems.

Minimal Current Consumption

The 74HC244 consumes a maximum of just 80 µA, which is quite low even under full load. This is beneficial in reducing the overall power demand of your system. In applications where power efficiency matters, such as portable electronics, the 74HC244 helps to extend operational time and reduce heat generation.

Strong Output Drive

The device provides a robust output drive of ±6 mA at 5V. This means that it can drive higher loads effectively, making it suitable for applications that require controlling other devices or components. Whether you are powering other chips, LEDs, or relays, this feature ensures stable performance.

CMOS-Level Inputs

The inputs on the 74HC244 are designed to operate at CMOS logic levels. This makes it compatible with other CMOS-based systems and devices, ensuring seamless communication and reducing the need for additional interfacing components.

Octal Bus Interface

With its octal bus interface, the 74HC244 can handle data from multiple sources. It is an ideal choice for bus-oriented systems, providing a streamlined way to move and manage data between different components in your design, making it efficient for use in data communication networks or larger electronic systems.

High Noise Immunity

The device offers strong noise immunity, which means it is resistant to electrical noise that could otherwise disrupt or degrade its performance. If your system is located in a noisy electrical environment, this feature ensures the 74HC244 will continue to function reliably.

Output Drive Capability

The 74HC244 is capable of driving up to 15 LSTTL loads, which makes it a good choice for systems that need to control multiple devices. This feature ensures that the IC can handle the additional demand placed on it without sacrificing performance or reliability.

Wide Operating Temperature Range

With an operating temperature range from -40°C to +125°C, the 74HC244 is built to withstand extreme environmental conditions. Whether you're working in hot industrial environments or cold outdoor systems, you can rely on this device to function properly without temperature-related performance issues.

Non-Inverting 3-State Outputs

The non-inverting 3-state outputs allow the 74HC244 to control whether the outputs are actively driving a signal or are in a high-impedance state. This feature is important in systems where multiple devices share a common bus or connection, preventing signal conflicts and making it easier to control various outputs.

Technical Specifications

Technical specifications, features, parameters, and comparable components for Nexperia USA Inc. 74HC244D,653.

Type	Parameter
Factory Lead Time	4 Weeks
Mounting Type	Surface Mount
Package / Case	20-SOIC (0.295, 7.50mm Width)
Surface Mount	YES
Number of Pins	20
Number of Elements	2
Operating Temperature	-40°C~125°C TA
Packaging	Tape & Reel (TR)
Series	74HC
Published	2011
JESD-609 Code	e4
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	20
Terminal Finish	Nickel/Palladium/Gold (Ni/Pd/Au)
Voltage - Supply	2V~6V
Terminal Position	DUAL
Terminal Form	GULL WING
Peak Reflow Temperature (°C)	260
Number of Functions	2
Supply Voltage	5V
Time @ Peak Reflow Temperature (Max)	30s
Base Part Number	74HC244
Pin Count	20
Qualification Status	Not Qualified
Output Type	3-State
Supply Voltage-Max (Vsup)	6V
Supply Voltage-Min (Vsup)	2V
Load Capacitance	50pF
Number of Ports	2
Family	HC/UH
Logic Type	Buffer, Non-Inverting
Output Polarity	TRUE
Number of Gates	8
Number of Bits per Element	4
Propagation Delay (tpd)	165 ns
Width	7.5mm
RoHS Status	ROHS3 Compliant

Alternative Options for the 74HC244

Part Number	Description	Manufacturer
CD74HC244M	Bus Driver, 2-Func, 4-Bit, True Output, CMOS, PDSO20	General Electric Solid State
MC74HC244ADWR2	HC/UH SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20, SOIC-20	Rochester Electronics LLC
74HC244D,653	74HC244; 74HCT244 - Octal buffer/line driver; 3-state @en-us SOP 20-Pin	Nexperia
933713420653	Bus Driver, HC/UH Series, 8-Func, 1-Bit, True Output, CMOS, PDSO20	Nexperia
MM74HC244WM	Octal 3-STATE Buffer, 1080-TUBE	ON Semiconductor
74HC244D/T3	IC HC/UH SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20, 7.50 MM, PLASTIC, MS-013, SOT-163-1, SOP-20, Bus Driver/Transceiver	NXP Semiconductors
MM74HC244WMX	IC HC/UH SERIES, DUAL 4-BIT DRIVER, TRUE OUTPUT, PDSO20, PLASTIC, SO-20, Bus Driver/Transceiver	National Semiconductor Corporation
MC74HC244ADWDR2	Bus Driver, HC/UH Series, 2-Func, 4-Bit, True Output, CMOS, PDSO20, SOIC-20	Motorola Semiconductor Products
CD74HC244M96	Bus Driver, HC/UH Series, 2-Func, 4-Bit, True Output, CMOS, PDSO20	Harris Semiconductor

Functional Diagram of the 74HC244

Applications of the 74HC244

Motor Drivers

The 74HC244 is commonly used in motor drivers where it helps control the signals sent to the motor. Its ability to handle multiple outputs and manage signals efficiently makes it an important component in motor control circuits. Whether you’re working on small hobbyist projects or industrial machines, this IC provides the reliability you need for smooth motor operation.

LED Displays

In LED displays, the 74HC244 is responsible for managing the data and control signals required for the display to function correctly. It ensures that the display receives the right signals at the right time, contributing to clearer and more stable visual output. This makes it a good option for applications such as digital signage, scoreboards, or any system that uses LED arrays for visual information.

Servers and Telecom Infrastructure

Servers and telecom infrastructure require efficient handling of data transmission and signal management, both of which the 74HC244 can support. Its ability to interface with different logic levels and manage bus systems allows it to play a role in ensuring reliable communication between components in large-scale systems. If you're involved in designing networked systems, this IC helps ensure smooth data flow and reduces the risk of signal degradation.

74HC244 Packaging Information

About the Manufacturer

Nexperia, based in Nijmegen, Netherlands, is a leading semiconductor manufacturer known for its reliable and efficient products. With manufacturing facilities in both Hamburg, Germany, and Greater Manchester, England, Nexperia ensures that it can meet the global demand for its products. The company originally started as a part of Philips Semiconductors before transitioning to NXP Semiconductors, and eventually becoming its own entity.

Nexperia specializes in a wide range of semiconductor products, including diodes, bipolar transistors, MOSFETs, ESD protection devices, TVS diodes, and various logic devices.

Parts with Comparable Specifications

The three components listed on the right share similar specifications with Nexperia USA Inc. 74HC244D,653.

Part Number	74HC244D,653	SN74HC244DW	SN74HC244DWR	SN74HC240DW
Manufacturer	Nexperia USA Inc.	Texas Instruments	Texas Instruments	Texas Instruments
Package / Case	20-SOIC (0.295, 7.50mm)	20-SOIC (0.295, 7.50mm)	20-SOIC (0.295, 7.50mm)	20-SOIC (0.295, 7.50mm)
Number of Pins	20	20	20	20
Supply Voltage	5 V	5 V	5 V	5 V
Current - Output High	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA	7.8mA, 7.8mA
Moisture Sensitivity	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Number of Ports	2	2	2	2
Width	7.5 mm	7.5 mm	7.5 mm	7.5 mm
Pin Count	20	20	20	20
View Compare	74HC244D,653 vs SN74HC244DW	74HC244D,653 vs SN74HC244DWR	74HC244D,653 vs SN74HC240DW	74HC244D,653 vs SN74HC240DW

Datasheet PDF

74HC244D,653 Datasheet:

74HC244D,653.pdf

74HC244D,653.pdf

SN74HC244DW Datasheet:

SN74HC244DW.pdf

SN74HC244DWR Datasheet:

SN74HC244DWR.pdf

Frequently Asked Questions [FAQ]

1. What is the difference between the 74HC244 and the 74ACT244?

The 74HC244 operates using CMOS logic levels, while the 74ACT244 uses TTL logic levels. This means the high and low levels for their inputs and outputs are defined differently. Additionally, they have different operating voltage ranges. The 74HC244 works within a range of 2V to 6V, whereas the 74ACT244 operates between 4.5V and 5.5V. The 74ACT244 also has a stronger output drive capability.

2. What is the 74HC244 chip used for?

The 74HC244 is a three-state buffer and line driver. It doesn’t have a download function or perform complex tasks on its own. Its main job is to act as a buffer driver, which helps boost your signal’s load capacity, making it more reliable for transmitting data across systems.

3. Can the 74HC244 work in a 3.3V system?

Yes, the 74HC244 can work perfectly in a 3.3V system. As a CMOS device, its power supply voltage range is between 2V and 6V, making it fully compatible with systems operating at 3.3V.