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

STMicroelectronics 74LVC244ATTR

Name: 74LVC244ATTR
Brand: STMicroelectronics
SKU: 74LVC244ATTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 74LVC244ATTR

Manufacturer:: STMicroelectronics

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: 74LVC244ATTR.pdf

Description:: IC BUF NON-INVERT 3.6V 20TSSOP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

74LVC244ATTR from STMicroelectronics is an octal 3-state bus buffer with dual independent output-enable controls (1G and 2G), operating from 1.65 V to 3.6 V, delivering 5.9 ns max propagation delay at 3.0 V, ±24 mA output drive, and 5V-tolerant inputs - used for bidirectional data buffering in mixed-voltage memory address/data buses and PCI-compliant interfaces.

For engineers reviewing the 74LVC244ATTR datasheet, 74LVC244ATTR pinout, 74LVC244ATTR application, or 74LVC244ATTR equivalent, key selection criteria include 3.3 V logic compatibility, high-speed 3-state control timing (tPZL/tPLZ ≤ 9.1 ns), symmetrical drive strength, latch-up immunity (>500 mA), and TSSOP-20 packaging for space-constrained PCB layouts.

Technical Context

This device implements two groups of four non-inverting buffers, each controlled by a dedicated 3-state enable input (1G and 2G). All inputs tolerate up to 5.5 V regardless of VCC, enabling safe interfacing between 3.3 V logic and legacy 5 V signal domains.

It uses sub-micron C2MOS technology with double-layer metal wiring, achieving balanced tPLH ≅ tPHL propagation delays and low dynamic noise (VOLP = 0.8 V, VOLV = −0.8 V at 3.3 V). Power-down protection ensures zero current flow on inputs/outputs when VCC = 0 V.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65 V to 3.6 V - supports single-supply operation across LVC logic families and enables direct replacement of 3.3 V AC/ACT devices
tPD (Max)	5.9 ns at VCC = 3.0 V - enables reliable 100+ MHz bus operation with margin for trace routing and loading
IOL / IOH	±24 mA at VCC = 3.0–3.6 V - drives standard 50 Ω transmission lines or multiple CMOS loads without external termination
Input Voltage Tolerance	−0.5 V to +7.0 V - allows direct connection to 5 V buses without level shifters in mixed-voltage systems
IOZ Leakage	±5 µA at VCC = 3.6 V - ensures minimal standby current in high-impedance state during power-gated modes
ESD Rating	HBM > 2000 V - meets industrial IEC 61000-4-2 system-level ESD robustness requirements without added protection circuitry

Pinout & Package

TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	Output Enable Inputs (1G, 2G)	Active-low enables for Group 1 (pins 2,4,6,8 → 1Y1–1Y4) and Group 2 (pins 11,13,15,17 → 2Y1–2Y4)
2,4,6,8	Data Inputs (1A1–1A4)	Non-inverting inputs for first buffer group; 5 V tolerant, TTL-compatible thresholds
3,5,7,9	Data Outputs (1Y1–1Y4)	3-state outputs with symmetrical drive (\|IOH\| = \|IOL\|), low skew (<1 ns)
11,13,15,17	Data Inputs (2A1–2A4)	Non-inverting inputs for second buffer group; electrically isolated from Group 1
12,14,16,18	Data Outputs (2Y1–2Y4)	Independent 3-state outputs with identical DC/AC specs as Group 1 outputs
10	GND	Dedicated ground reference for noise isolation between input and output sections
20	VCC	Single positive supply; powers both input and output stages; decoupling required within 1 cm

Key Features

Feature	Design Value
5 V tolerant inputs	Enables plug-and-play integration into legacy 5 V subsystems without voltage translation or risk of overvoltage damage
Power-down protection	Prevents back-driving and leakage when VCC = 0 V - critical for hot-swap and partial-power-down architectures
Symmetrical output impedance	Ensures matched rise/fall times and reduced signal distortion on shared bus traces
Latch-up immunity >500 mA	Guarantees robust operation under transient overcurrent events per JESD17, eliminating need for external current limiting

Applications

Memory Address Buffering

PCI Bus Interface

Use Scenario: Driving 32-bit address lines from a 3.3 V microcontroller to SDRAM modules operating at 3.3 V with 5 V-tolerant address latches.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fanout, voltage-level bridging, and bus contention control via separate 1G/2G enables.

Use Value: Eliminates need for discrete level shifters while maintaining <6 ns propagation delay and <1 ns inter-output skew for synchronous timing alignment.

Use Scenario: Interfacing a 3.3 V FPGA PCIe root complex to legacy 5 V PCI add-in cards in industrial backplanes.

IC Role / Device Role / Timing Role: Bidirectional bus driver with 5 V-tolerant inputs and 3.3 V-compatible outputs, synchronized to PCI clock domain.

Use Value: Meets PCI Local Bus Specification v2.2 electrical requirements for 24 mA drive strength and 5 V tolerance without external clamping diodes.

Low-Power Industrial Controller

Mixed-Voltage Sensor Hub

Use Scenario: Isolating GPIO expansion signals between a 1.8 V MCU and 3.3 V peripheral ICs in battery-powered programmable logic controllers.

IC Role / Device Role / Timing Role: Voltage-translating buffer with ultra-low ICC (10 µA typical) and data retention down to 1.2 V.

Use Value: Reduces system standby power by >40% versus 5 V TTL buffers while preserving signal integrity across voltage domains.

Use Scenario: Aggregating analog sensor outputs (via ADCs) and digital status signals from multiple 5 V sensors into a 3.3 V SoC-based edge node.

IC Role / Device Role / Timing Role: Input-safe signal conditioner that prevents cross-talk and ground bounce during simultaneous multi-channel sampling.

Use Value: Enables direct connection of 5 V sensor outputs without resistive dividers, reducing BOM count and improving SNR by 3 dB.

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
SN74LVC244APWR	Same logic function and pinout; TI version has slightly higher ICC (20 µA max) and lower ESD rating (HBM = 2 kV vs ST's >2 kV)	Identical use in memory buffering; minor derating needed in high-noise factory-floor environments	Select if TI supply chain preference exists; verify layout decoupling matches ST's 10 µA quiescent spec
74ALVC244MTCX	Higher speed (tPD = 3.5 ns @ 3.3 V) but narrower VCC range (2.3–3.6 V); no 1.65 V support	Not suitable for 1.8 V systems or brown-out conditions below 2.3 V	Choose only for speed-critical designs where full 1.65–3.6 V range is not required

Compared with SN74LVC244APWR and 74ALVC244MTCX, the 74LVC244ATTR offers broader voltage flexibility (1.65 V start), superior power-down safety, and tighter skew control - making it optimal for industrial embedded systems requiring robustness across wide temperature and supply ranges.

Availability

74LVC244ATTR is available at Aetrix Electronics and suitable for memory address buffering, PCI bus interface, low-power industrial controller, and mixed-voltage sensor hub applications requiring stable component supply and long-term manufacturability.

Supply support for 74LVC244ATTR 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, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets with emphasis on reliability, energy efficiency, and system integration.

The 74LVC244ATTR belongs to ST's LVC (Low-Voltage CMOS) logic family, engineered specifically for high-speed, low-power, mixed-voltage interoperability in space- and power-constrained embedded systems.

FAQ

Can 74LVC244ATTR operate at 1.8 V and still drive 24 mA?

No. At VCC = 1.8 V, the guaranteed output drive is ±4 mA per pin (per DC specs). The ±24 mA rating applies only at VCC = 3.0–3.6 V. Operating at 1.8 V delivers adequate drive for light loads (e.g., one CMOS input) but requires verification against actual load capacitance and timing budget.

Is the 74LVC244ATTR pin-compatible with standard 74LS244?

Yes - it is pin- and function-compatible with the 74 series 244, including identical pin numbering and truth table behavior. However, it lacks LS-family TTL input thresholds and requires 3.3 V supply; direct substitution in 5 V-only systems requires verifying input voltage compatibility and output swing margins.

What is the maximum capacitive load this device can drive reliably at 100 MHz?

Based on tPD = 5.9 ns and output impedance (~20 Ω), the device reliably drives ≤30 pF at 100 MHz (per test condition CL = 50 pF at fIN = 1 MHz). For 100 MHz operation, limit load to 15–20 pF with controlled-impedance routing and local decoupling to maintain signal integrity and meet setup/hold timing.

Does 74LVC244ATTR support hot insertion when VCC is unpowered?

Yes - its power-down protection ensures inputs and outputs remain high-impedance with zero leakage (IOFF = 10 µA max) when VCC = 0 V. This allows safe insertion into live backplanes, provided GND is connected first and all signals stay within −0.5 V to 5.5 V absolute limits per pin.

74LVC244ATTR Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: 74LVC

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:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-TSSOP

74LVC244ATTR FAQ

1.How can I place an order for 74LVC244ATTR through Aetrix?

Please submit a Request for Quotation (RFQ) for 74LVC244ATTR 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 74LVC244ATTR reliable?

The price and inventory of 74LVC244ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LVC244ATTR is usually 5 days.

3.What payment methods are accepted for 74LVC244ATTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LVC244ATTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 74LVC244ATTR?

74LVC244ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 74LVC244ATTR 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 74LVC244ATTR?

For technical support, including 74LVC244ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LVC244ATTR requirements.

6.How does Aetrix verify that 74LVC244ATTR is sourced from the original manufacturer or authorized distributors?

All 74LVC244ATTR 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 74LVC244ATTR meets industry standards.

7.What is the process for return or replacement of 74LVC244ATTR?

All 74LVC244ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LVC244ATTR, 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 74LVC244ATTR part is unused and in its original packaging.

Return procedure for 74LVC244ATTR:

1.Submit a request within 90 days.

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

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