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Home > Products > Integrated Circuits (ICs) > Logic > Buffers, Drivers, Receivers, Transceivers

STMicroelectronics M74HC244TTR

Name: M74HC244TTR
Brand: STMicroelectronics
SKU: M74HC244TTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M74HC244TTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: M74HC244TTR.pdf

Description:: IC BUFFER NON-INVERT 6V 20TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

M74HC244TTR from STMicroelectronics is an octal non-inverting 3-state bus buffer IC used for bidirectional data bus driving and address buffering in digital systems. It features 8 independent channels split into two groups (1Y–1A and 2Y–2A), dual output-enable inputs (1G, 2G), propagation delay of 10 ns (typ.) at 6 V, symmetrical ±6 mA drive capability, and operates from 2 V to 6 V supply.

For engineers reviewing the M74HC244TTR datasheet, M74HC244TTR pinout, M74HC244TTR application, or M74HC244TTR equivalent, key selection criteria include 3-state timing behavior, rail-to-rail input compatibility, high noise immunity (28% VCC), low quiescent current (4 µA max), and TSSOP-20 package suitability for space-constrained logic interfacing.

Technical Context

The M74HC244TTR implements two independent 4-bit non-inverting buffer sections, each controlled by a dedicated active-low output-enable input (1G and 2G). All inputs are protected against ESD and transient overvoltage, and outputs exhibit matched rise/fall times and balanced drive strength (|IOH| = IOL ≥ 6 mA).

It uses silicon gate C2MOS technology to achieve high speed with low power consumption across its full 2–6 V operating range. Propagation delays are balanced (tPLH ≅ tPHL), and output enable/disable times are specified under defined load conditions (RL = 1 kΩ, CL = 50 pF), supporting reliable bus arbitration in memory and peripheral interfaces.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	2 V to 6 V - supports mixed-voltage system interfacing (e.g., 3.3 V ↔ 5 V buses)
Propagation Delay	10 ns (typ.) at VCC = 6 V - enables ≤50 MHz bus operation with margin
Output Drive	±6 mA (min.) - sufficient to drive standard TTL loads and 50 pF traces
Input Noise Immunity	28% VCC (min.) - rejects >1.4 V noise on 5 V systems without false toggling
Quiescent Current	4 µA (max. at TA = 25°C) - suitable for low-power standby modes
Operating Temp	−55°C to +125°C - qualified for industrial and extended-temperature applications
3-State Enable Time	14 ns (typ., VCC = 6 V) - ensures fast bus release during multiplexer switching

Pinout & Package

TSSOP-20 package: 20-pin thin shrink small outline package with 0.65 mm pitch, 6.5 mm × 4.4 mm body, and exposed pad not present. Designed for surface-mount reflow assembly and PCB space efficiency.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	Output Enable (1G, 2G)	Active-low control per 4-bit section; enables/disables respective Y outputs to high-impedance state
2,4,6,8	Data Inputs (1A1–1A4)	Non-inverting inputs for first buffer group; accept 0–VCC logic levels
3,5,7,9	Data Outputs (1Y1–1Y4)	Corresponding non-inverting buffered outputs; tri-stated when 1G = HIGH
11,13,15,17	Data Inputs (2A1–2A4)	Non-inverting inputs for second buffer group; electrically isolated from first group
12,14,16,18	Data Outputs (2Y1–2Y4)	Corresponding outputs; independently controlled by 2G; share no internal coupling with 1Y group
10	GND	Ground reference for all I/O and internal logic; must be low-impedance connection
20	VCC	Positive supply for CMOS core; bypassing with 100 nF ceramic near pin recommended

Key Features

Feature	Design Value
Symmetrical Output Impedance	Matched \|IOH\| and IOL ≥ 6 mA minimizes skew between rising/falling edges on shared buses
Balanced Propagation Delays	tPLH ≅ tPHL ensures consistent timing margins for setup/hold in synchronous bus designs
High Noise Immunity	VIH/VIL thresholds fixed at 3.15 V / 1.35 V (at VCC = 4.5 V) reduce susceptibility to crosstalk
Wide Supply Range	2–6 V operation allows direct interface with 2.5 V, 3.3 V, and 5 V logic families without level shifters
ESD Protection	All inputs include diode clamps to VCC/GND, rated for ±2 kV HBM per JEDEC JS-001

Applications

Memory Address Buffering

Microcontroller Bus Expansion

Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or flash devices sharing a common data bus.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating MCU address outputs; enables time-multiplexed access via G-control sequencing.

Use Value: Prevents bus contention during chip select transitions; 10 ns delay ensures address valid before memory access window.

Use Scenario: Expanding GPIO count by connecting parallel peripherals (e.g., LCD controller, ADC, keypad matrix) to an MCU with limited pins.

IC Role / Device Role / Timing Role: Bidirectional bus driver enabling read/write handshaking between MCU and peripheral registers.

Use Value: Dual 4-bit sections allow independent control of address/data lanes; 6 mA drive sustains signal integrity over 10 cm PCB traces.

Industrial PLC I/O Module

Digital Test Equipment Interface

Use Scenario: Level-shifting and isolating field I/O signals (24 V digital inputs) to a 3.3 V FPGA-based controller using optocoupler interfaces.

IC Role / Device Role / Timing Role: Signal conditioner between isolation stage and FPGA logic; provides clean, slew-controlled logic levels.

Use Value: −55°C to +125°C rating supports operation in uncontrolled cabinet environments; low ICC reduces thermal load in sealed enclosures.

Use Scenario: Interfacing automated test equipment (ATE) pattern generators to DUTs requiring precise timing alignment across 8 signal lines.

IC Role / Device Role / Timing Role: Synchronized fan-out buffer ensuring simultaneous edge delivery to DUT inputs with minimal skew.

Use Value: Matched tPLH/tPHL (<2 ns skew) and 0.65 mm pitch TSSOP enable compact, high-density probe card layouts.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74HC244PWR	TI part in TSSOP-20; identical AC/DC specs but different VIL/VIH minima at 2 V (0.5 V vs 0.5 V), same 10 ns tPD	Qualified to AEC-Q100 Grade 1; preferred for automotive ECUs where qualification traceability is required	Select if automotive qualification or TI supply chain preference applies; otherwise functionally interchangeable
74VHC244MTCX	ON Semiconductor part; higher drive (±8 mA), faster tPD (7.5 ns typ. at 5 V), but narrower VCC range (2–5.5 V)	Superior speed/power trade-off for 3.3 V high-throughput systems; not rated for 6 V operation	Choose when 5 V max supply and sub-8 ns delay are critical; verify 6 V incompatibility in legacy 5 V designs

Compared with SN74HC244PWR and 74VHC244MTCX, the M74HC244TTR offers the widest supply range (2–6 V) and industrial temperature support, making it optimal for multi-rail legacy systems and harsh-environment deployments where voltage margin and thermal robustness outweigh marginal speed gains.

Availability

M74HC244TTR is available at Aetrix Electronics and suitable for memory address buffering, microcontroller bus expansion, industrial PLC I/O modules, and digital test equipment interfaces requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for M74HC244TTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

The M74HC244TTR belongs to ST's high-speed CMOS logic family, engineered for robust interoperability across voltage domains and reliability in industrial control, instrumentation, and legacy system upgrades.

FAQ

What is the maximum capacitive load the M74HC244TTR can drive while maintaining specified timing?

The AC specifications are guaranteed with CL = 50 pF, including jig and probe capacitance. At 6 V supply, tPLH/tPHL remains ≤23 ns up to 150 pF. Driving >150 pF may increase delay and skew beyond datasheet limits; external series termination or buffer staging is recommended for heavier loads.

Can M74HC244TTR safely interface between 3.3 V and 5 V logic domains?

Yes - its 2–6 V VCC range and input thresholds referenced to VCC allow direct connection: 3.3 V outputs meet VIH (≥2.1 V) and VIL (≤1.0 V) requirements of the M74HC244TTR at 5 V supply, and vice versa with appropriate pull-ups. No level shifter is needed for basic DC interfacing.

Does the M74HC244TTR support hot insertion or live bus swapping?

No - it lacks powered-off protection (Ioff) or bus-hold circuitry. Applying signals to inputs or outputs while VCC = 0 V may forward-bias internal protection diodes, causing excessive current. Power sequencing must ensure VCC is stable before asserting any I/O signals.

How does the dual output-enable architecture improve system design flexibility?

The separate 1G and 2G inputs allow independent control of two 4-bit data paths - e.g., one group for address lines and another for control/status signals. This eliminates need for additional logic gates or multiplexers, reduces PCB routing complexity, and enables staggered enable timing to minimize simultaneous switching noise on shared VCC/GND planes.

M74HC244TTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74HC

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Logic Type:: Buffer, Non-Inverting

Number of Elements:: 2

Number of Bits per Element:: 4

Input Type:: -

Output Type:: 3-State

Current - Output High, Low:: 7.8mA, 7.8mA

Voltage - Supply:: 2V ~ 6V

Operating Temperature:: -55°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

M74HC244TTR FAQ

1.How can I place an order for M74HC244TTR through Aetrix?

Please submit a Request for Quotation (RFQ) for M74HC244TTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M74HC244TTR reliable?

The price and inventory of M74HC244TTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC244TTR is usually 5 days.

3.What payment methods are accepted for M74HC244TTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC244TTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M74HC244TTR?

M74HC244TTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M74HC244TTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M74HC244TTR?

For technical support, including M74HC244TTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC244TTR requirements.

6.How does Aetrix verify that M74HC244TTR is sourced from the original manufacturer or authorized distributors?

All M74HC244TTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M74HC244TTR meets industry standards.

7.What is the process for return or replacement of M74HC244TTR?

All M74HC244TTR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC244TTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M74HC244TTR part is unused and in its original packaging.

Return procedure for M74HC244TTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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