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74HC244D

Octal non-inverting buffer/line driver, 3-state, 2x 4-bit groups, 2.0-6.0V, SO20, ±6mA drive

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Manufacturer Part：

74HC244D

Package：

SO20 (SOT163-1) 12.8 x 5.3 x 1.75 mm

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Integrated Circuits ICs

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Description

Product Overview

The Nexperia 74HC244D is an octal buffer/line driver with 3-state outputs in an SO20 package. It features two 4-bit groups with separate enable controls, operates from 2.0 V to 6.0 V, and provides ±6 mA output drive. Ideal for bus driving and signal buffering in digital systems.

Key Specifications

Supply Voltage (VCC)	2.0 V to 6.0 V
Logic Family	74HC (CMOS)
Number of Buffers	8 (2 x 4-bit groups)
Output Type	3-state (non-inverting)
Output Drive	±6 mA
Propagation Delay	13 ns (typical at 4.5V)
Enable Inputs	2 (active LOW, one per 4-bit group)
Operating Temperature	-40°C to +125°C

Features

Octal non-inverting buffer/line driver with 3-state outputs
Two 4-bit groups with separate enable controls
Wide supply voltage range from 2.0 V to 6.0 V
CMOS low power dissipation with high noise immunity
Input clamp diodes for interfacing to voltages above VCC
Non-inverting data path for signal integrity

Applications

Bus buffering and line driving in microprocessor systems
Memory address and data bus drivers
3-state bus interface for multi-master systems
Signal isolation and buffering

Product Introduction:74HC244D Product Introduction

The Nexperia 74HC244D is an octal non-inverting buffer/line driver with 3-state outputs in an SO20 package. The device is organized as two 4-bit groups, each with its own active LOW output enable input (1OE and 2OE). When the enable input is LOW, the corresponding buffer outputs follow the inputs; when HIGH, the outputs are placed in a high-impedance OFF-state. This organization allows the two 4-bit groups to be controlled independently, providing flexibility for bus-oriented applications. The device operates from 2.0V to 6.0V with ±6 mA output drive capability. Input clamp diodes allow interfacing to voltages in excess of VCC using current limiting resistors. The device is specified from -40°C to +125°C and complies with JEDEC standards.

Working Principle:74HC244D Working Principle

The 74HC244D contains eight independent non-inverting buffers divided into two groups of four. Each group is controlled by an active LOW output enable (1OE for group 1, 2OE for group 2). When the enable is LOW, the buffer passes the input signal to the output with minimal propagation delay (13 ns typical at 4.5V). When the enable is HIGH, the output enters a high-impedance 3-state condition, effectively disconnecting the buffer from the bus. This allows multiple 74HC244 devices to share a common bus without contention. The non-inverting architecture preserves signal polarity, making the device suitable for address and data bus buffering. The CMOS implementation provides rail-to-rail output swing with low static power consumption.

Pin Description:74HC244D Pin Definition and Functions

Pin	Name	Type	Function
1	1OE	Input	Output enable for group 1 (active LOW)
2-5	1A0-1A3	Input	Data inputs for group 1
6	GND	Power	Ground (0 V)
7-9	2Y4-2Y6	Output	Data outputs for group 2 (bits 4-6)
10	2OE	Input	Output enable for group 2 (active LOW)
11	2OE	Input	Output enable for group 2 (active LOW)
12-15	1Y3-1Y0	Output	Data outputs for group 1
16-19	2A3-2A0	Input	Data inputs for group 2
20	VCC	Power	Supply voltage

Application Scenarios:In which products and applications is74HC244D used

Microprocessor address and data bus buffering
Memory interface line driving
3-state bus interface for multi-master digital systems
Signal isolation between subsystems
Industrial control bus drivers

Alternative Models:What chips are recommended as replacements for 74HC244D

Manufacturer	Part Number	Package	Notes
Texas Instruments	SN74HC244D	SOIC-20	Pin-to-pin compatible
onsemi	MC74HC244ADWR2G	SOIC-20	Equivalent function
Toshiba	TC74HC244AP	DIP-20	Equivalent function
Nexperia	74HCT244D	SO20	TTL input level variant
Nexperia	74HC244PW	TSSOP20	Same function, TSSOP package