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

Texas Instruments SN74AUC244RGYRG4

Name: SN74AUC244RGYRG4
Brand: Texas Instruments
SKU: SN74AUC244RGYRG4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74AUC244RGYRG4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-VFQFN Exposed Pad

Datasheet:: SN74AUC244RGYRG4.pdf

Description:: IC BUFFER NON-INVERT 2.7V 20VQFN

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Product details

Overview

SN74AUC244RGYRG4 from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for 1.65-V to 1.95-V V_CC operation and 3.6-V I/O tolerant signaling. It features ±8-mA output drive at 1.8 V, 1.9-ns max propagation delay, 20-µA max ICC, and I_off support for partial-power-down mode - enabling use in low-voltage FPGA I/O bridging and mixed-signal interconnect applications.

For engineers reviewing the SN74AUC244RGYRG4 datasheet, SN74AUC244RGYRG4 pinout, SN74AUC244RGYRG4 application, or SN74AUC244RGYRG4 equivalent, key selection considerations include its sub-1-V operability, 20-pin VQFN (RGY) package with exposed thermal pad, 3.6-V I/O tolerance for level-shifting, and guaranteed 3-state behavior during power sequencing.

Technical Context

This device implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) control. Its logic diagram confirms direct A→Y signal path under OE = L, and high-impedance Y outputs under OE = H - no internal inversion or latching.

Designed for ultra-low-voltage systems, it operates across 0.8 V–2.7 V V_CC, with optimized performance at 1.8 V: t_pd = 1.9 ns (CL = 15 pF), VOL = 0.45 V at I_OL = 8 mA, and VOH = 1.2 V at I_OH = –8 mA - all verified per JESD78 Class II latch-up and JESD22 ESD specifications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CC Range	0.8 V to 2.7 V - supports sub-1-V operation and mixed-mode 1.8-V/3.3-V system interfacing
Max t_pd	1.9 ns at 1.8 V, CL = 15 pF - enables high-speed data routing in compact timing-critical paths
I/O Tolerance	3.6 V - allows safe connection to higher-voltage buses without external level shifters
I_off	<±10 µA at 2.7 V - prevents backflow current during partial power-down, protecting powered subsystems
Output Drive	±8 mA at 1.8 V - sufficient to drive 50-Ω transmission lines or multiple CMOS inputs with margin
ESD Rating	2000-V HBM, 200-V MM, 1000-V CDM - meets industrial-grade robustness requirements
Package	VQFN-20 (RGY), 3.5 mm × 4.5 mm, 0.5-mm pitch - surface-mount footprint with exposed thermal pad for thermal management

Pinout & Package

VQFN-20 (RGY) package: 3.5 mm × 4.5 mm body, 0.5-mm lead pitch, 1-mm max height, with exposed thermal pad (Pin 21) requiring PCB soldering for thermal and mechanical integrity.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8	Input A1–A4 (Group 1), A1–A4 (Group 2)	Noninverting data inputs for respective 4-bit buffer sections
9, 10, 11, 12, 13, 14, 15, 16	Output Y1–Y4 (Group 1), Y1–Y4 (Group 2)	3-state buffered outputs; high-Z when corresponding OE = H
17, 19	Output Enable OE1, OE2	Active-low enables for Group 1 and Group 2 buffers independently
18	V_CC	Supply voltage input (0.8–2.7 V); must be decoupled locally
20	GND	Ground reference; connects to PCB ground plane and thermal pad
21 (exposed pad)	Thermal Pad	Must be soldered to PCB copper pour for thermal dissipation and mechanical stability

Key Features

Feature	Design Value
3.6-V I/O Tolerance	Enables direct interface between 1.8-V logic and 3.3-V peripherals without external translators
I_off Protection	Disables outputs during power-down, preventing damaging back-current in partially powered systems
Sub-1-V Operability	Functional down to 0.8 V V_CC, supporting emerging ultra-low-power microcontroller and sensor node designs
Low ICC	20-µA max supply current enables battery-powered operation with minimal quiescent drain
High-Speed t_pd	1.9 ns at 1.8 V ensures minimal latency in high-throughput data paths such as memory bus extensions

Applications

FPGA I/O Expansion	Low-Voltage Microcontroller Bus Buffering
Use Scenario: Expanding limited I/O count of Xilinx Artix-7 or Intel Cyclone V FPGA by driving off-chip peripherals via shared address/data bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional signal isolation and voltage-level translation between 1.8-V FPGA core and 3.3-V peripheral ICs. Use Value: Eliminates need for discrete level shifters while maintaining <1.9-ns timing margin for 100-MHz bus operation.	Use Scenario: Isolating and buffering GPIO expansion on TI MSP430FRxx or ST STM32L4+ MCUs operating at 1.8 V. IC Role / Device Role / Timing Role: Octal driver enabling parallel control of LED arrays, sensors, or digital potentiometers without loading MCU pins. Use Value: Delivers ±8-mA drive per channel at 1.8 V, supporting direct LED drive with single-resistor current limiting.
Mixed-Mode Signal Interfacing	Power Sequencing-Safe Logic Interface
Use Scenario: Bridging 1.8-V SoC domain to legacy 3.3-V SPI flash or UART transceivers in industrial gateways. IC Role / Device Role / Timing Role: Voltage-tolerant buffer ensuring signal integrity across supply domains while meeting JEDEC 3.6-V I/O spec. Use Value: 3.6-V I/O rating avoids clamping diode conduction, preserving noise margins and reducing EMI risk.	Use Scenario: Interfacing between always-on PMIC rails and intermittently powered application processors in portable devices. IC Role / Device Role / Timing Role: I_off-enabled buffer preventing backfeed current when processor V_CC is off but PMIC remains active. Use Value: Complies with JESD78 Class II latch-up immunity and eliminates need for external blocking FETs.

FPGA I/O Expansion

Low-Voltage Microcontroller Bus Buffering

Use Scenario: Expanding limited I/O count of Xilinx Artix-7 or Intel Cyclone V FPGA by driving off-chip peripherals via shared address/data bus.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing bidirectional signal isolation and voltage-level translation between 1.8-V FPGA core and 3.3-V peripheral ICs.

Use Value: Eliminates need for discrete level shifters while maintaining <1.9-ns timing margin for 100-MHz bus operation.

Use Scenario: Isolating and buffering GPIO expansion on TI MSP430FRxx or ST STM32L4+ MCUs operating at 1.8 V.

IC Role / Device Role / Timing Role: Octal driver enabling parallel control of LED arrays, sensors, or digital potentiometers without loading MCU pins.

Use Value: Delivers ±8-mA drive per channel at 1.8 V, supporting direct LED drive with single-resistor current limiting.

Mixed-Mode Signal Interfacing

Power Sequencing-Safe Logic Interface

Use Scenario: Bridging 1.8-V SoC domain to legacy 3.3-V SPI flash or UART transceivers in industrial gateways.

IC Role / Device Role / Timing Role: Voltage-tolerant buffer ensuring signal integrity across supply domains while meeting JEDEC 3.6-V I/O spec.

Use Value: 3.6-V I/O rating avoids clamping diode conduction, preserving noise margins and reducing EMI risk.

Use Scenario: Interfacing between always-on PMIC rails and intermittently powered application processors in portable devices.

IC Role / Device Role / Timing Role: I_off-enabled buffer preventing backfeed current when processor V_CC is off but PMIC remains active.

Use Value: Complies with JESD78 Class II latch-up immunity and eliminates need for external blocking FETs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74AUC244RGYR	Same die, identical electrical specs, identical RGY package - differs only in tape-and-reel packaging (no G4 suffix)	No functional difference; G4 denotes RoHS-compliant NiPdAu lead finish per TI specification	Select SN74AUC244RGYR if standard NiPdAu finish suffices; SN74AUC244RGYRG4 required where G4-specific qualification is mandated.
SN74LVC244APWR	Higher V_CC range (1.65–3.6 V), slower t_pd (3.5 ns @ 3.3 V), lower drive (±24 mA @ 3.3 V), no sub-1-V operation	Better suited for 3.3-V-only systems; lacks I_off and 3.6-V I/O tolerance at 1.8-V operation	Choose SN74LVC244APWR only when operating above 2.3 V or when cost sensitivity outweighs speed/power advantages of AUC family.

Compared with SN74AUC244RGYRG4, SN74AUC244RGYR offers identical performance with standard packaging, while SN74LVC244APWR trades speed and ultra-low-voltage capability for broader voltage range and higher drive at 3.3 V - making SN74AUC244RGYRG4 optimal for 1.8-V high-speed, mixed-signal, or power-gated designs.

Availability

SN74AUC244RGYRG4 is available at Aetrix Electronics and suitable for FPGA I/O expansion, low-voltage microcontroller bus buffering, and mixed-mode signal interfacing requiring stable component supply, consistent RoHS-compliant finish, and guaranteed VQFN-20 packaging.

Supply support for SN74AUC244RGYRG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity technologies, with over 50 years of innovation in high-reliability logic and interface solutions.

The SN74AUC244RGYRG4 belongs to TI's Advanced Ultra-Low-Voltage CMOS (AUC) logic family, engineered for sub-1.8-V operation in portable, battery-powered, and energy-constrained systems where speed, power, and voltage flexibility are critical.

FAQ

What is the minimum V_CC at which SN74AUC244RGYRG4 guarantees functional operation?

The SN74AUC244RGYRG4 is fully specified from 0.8 V to 2.7 V V_CC, with recommended operation between 1.65 V and 1.95 V. At 0.8 V, it maintains logic functionality and meets AC timing (tpd ≤ 6.5 ns) and DC parameters (VIL/VIL thresholds, ICC ≤ 20 µA), as validated in the SCES432 datasheet Section 4.

Does SN74AUC244RGYRG4 support true bidirectional data flow?

No - the SN74AUC244RGYRG4 is a unidirectional noninverting buffer: data flows only from A inputs to Y outputs. Bidirectional operation requires external control logic and separate enable signals; it does not integrate bus transceivers or direction-control circuitry.

How should the exposed thermal pad (Pin 21) of SN74AUC244RGYRG4 be handled on the PCB?

The exposed thermal pad (Pin 21) of SN74AUC244RGYRG4 must be soldered to a dedicated PCB copper pour connected to GND. TI recommends a 78% solder paste coverage stencil design and filling or tenting of thermal vias per SLUA271 guidelines to ensure mechanical reliability and thermal performance.

Is SN74AUC244RGYRG4 pin-compatible with SN74AUC244RGYR?

Yes - SN74AUC244RGYRG4 and SN74AUC244RGYR share identical VQFN-20 (RGY) package dimensions, pinout, and die functionality. The G4 suffix denotes a specific NiPdAu lead finish qualification; no PCB layout changes are needed when substituting between them.

What is the maximum capacitive load SN74AUC244RGYRG4 can drive while maintaining 1.9-ns propagation delay?

The 1.9-ns max tpd for SN74AUC244RGYRG4 is specified at CL = 15 pF and VCC = 1.8 V ± 0.15 V. Driving loads >15 pF increases tpd nonlinearly; at CL = 30 pF, tpd rises to 2.5 ns. For timing-critical paths, maintain CL ≤ 15 pF using short traces and minimal stubs.

SN74AUC244RGYRG4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74AUC

Package/Case:: 20-VFQFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

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:: 9mA, 9mA

Voltage - Supply:: 0.8V ~ 2.7V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-VQFN (3.5x4.5)

SN74AUC244RGYRG4 FAQ

1.How can I place an order for SN74AUC244RGYRG4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74AUC244RGYRG4 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 SN74AUC244RGYRG4 reliable?

The price and inventory of SN74AUC244RGYRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AUC244RGYRG4 is usually 5 days.

3.What payment methods are accepted for SN74AUC244RGYRG4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74AUC244RGYRG4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74AUC244RGYRG4?

SN74AUC244RGYRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74AUC244RGYRG4 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 SN74AUC244RGYRG4?

For technical support, including SN74AUC244RGYRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AUC244RGYRG4 requirements.

6.How does Aetrix verify that SN74AUC244RGYRG4 is sourced from the original manufacturer or authorized distributors?

All SN74AUC244RGYRG4 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 SN74AUC244RGYRG4 meets industry standards.

7.What is the process for return or replacement of SN74AUC244RGYRG4?

All SN74AUC244RGYRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AUC244RGYRG4, 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 SN74AUC244RGYRG4 part is unused and in its original packaging.

Return procedure for SN74AUC244RGYRG4:

1.Submit a request within 90 days.

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

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