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

Texas Instruments SN74F244NSRE4

Name: SN74F244NSRE4
Brand: Texas Instruments
SKU: SN74F244NSRE4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F244NSRE4

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN74F244NSRE4.pdf

Description:: IC BUFFER NON-INVERT 5.5V 20SO

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Product details

Overview

SN74F244NSRE4 from Texas Instruments is an octal noninverting 3-state buffer/line driver IC designed for memory address driving, bus interfacing, and clock distribution in TTL-compatible digital systems. It features two independent 4-bit channels with active-low output-enable (OE) control, 5 V nominal supply operation, propagation delay ≤6.5 ns, and output drive capability of ±64 mA. It is used in industrial control backplanes and legacy computing data buses.

For engineers reviewing the SN74F244NSRE4 datasheet, SN74F244NSRE4 pinout, SN74F244NSRE4 application, or SN74F244NSRE4 equivalent, key selection criteria include 3-state bus-driving capability, TTL-level compatibility, dual-channel independent enable control, guaranteed 0°C to 70°C operation, and SOP-20 package footprint compatibility with legacy board layouts.

Technical Context

The SN74F244NSRE4 implements two separate 4-bit noninverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE) inputs. Its 3-state outputs allow bidirectional bus sharing without contention, and its TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) ensure interoperability with standard 5 V logic families.

It operates strictly within 4.5–5.5 V supply range and delivers rail-to-rail output swing under load: VOL ≤ 0.55 V at I_OL = 64 mA and VOH ≥ 2.4 V at I_OH = −15 mA. Output leakage in high-impedance state is limited to ±50 µA at V_CC = 5.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures stable operation across standard TTL power rail tolerances.
Propagation Delay	t_PLH/t_PHL ≤ 6.5 ns - Enables reliable timing in 15 MHz+ synchronous bus systems.
Output Drive	I_OL = 64 mA / I_OH = −15 mA - Sufficient to drive 10+ standard TTL loads per output.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - Guarantees noise margin >0.4 V with 5 V TTL sources.
3-State Leakage	I_OZL/I_OZH ≤ ±50 µA - Prevents bus contention current in disabled state.
Operating Temperature	0°C to 70°C - Qualified for commercial-grade embedded and industrial control applications.

Pinout & Package

SOP-20 (Small Outline Package) with 1.27 mm pitch, 7.5 mm × 12.8 mm body, and 2.65 mm max height per TI DW0020A outline. Pin 1 marked by index area; leads are gull-wing, NIPDAU-plated, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
1, 2, 3, 4, 5, 6, 7, 8 (1A1–1A4, 2A1–2A4)	Input terminals for Channel 1 and Channel 2	Accept TTL-level signals; high-impedance inputs draw ≤−1.6 mA (I_IL) or ≤20 µA (I_IH) at V_CC = 5.5 V.
9, 10, 11, 12, 13, 14, 15, 16 (1Y1–1Y4, 2Y1–2Y4)	Noninverting buffered outputs	Drive bus lines or address registers; sink 64 mA or source 15 mA while maintaining VOL ≤ 0.55 V / VOH ≥ 2.4 V.
17, 18 (1OE, 2OE)	Active-low output-enable controls	Enable/disable respective 4-bit channel independently; OE = low → Y = A; OE = high → Y = high-Z.
19 (V_CC)	Positive supply	Must be decoupled locally; supports 4.5–5.5 V; ICC ≤ 90 mA when all outputs driven low.
20 (GND)	Ground reference	Return path for all I/O and supply currents; requires low-inductance connection to minimize switching noise.

Key Features

Feature	Design Value
Dual independent 4-bit channels	Enables simultaneous buffering of two separate 4-bit data/address groups with isolated enable control.
3-State outputs with symmetrical OE	Eliminates bus contention in shared-data-path architectures; OE inputs have identical DC specs and timing.
TTL-compatible input/output levels	Interoperates directly with 74LS, 74S, and other 5 V logic families without level-shifting circuitry.
High-output-current drive	64 mA sink capability per output supports fanout to ≥10 standard TTL loads, reducing need for external buffers.
Low propagation delay	6.5 ns max (A→Y) enables use in high-speed address latching and clock distribution up to ~15 MHz.

Applications

Memory Address Buffering	Parallel Bus Interface
Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory address inputs; enabled only during memory access cycles. Use Value: Prevents address bus contention during DMA or peripheral access; ensures clean signal integrity across 15 cm traces at 10 MHz.	Use Scenario: Interfacing an 8-bit microcontroller data bus to multiple peripheral devices (ADC, DAC, UART) via a common parallel bus. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling controlled data flow between master and slaves using separate OE control per channel. Use Value: Eliminates need for discrete transceivers; supports hot-swap-safe bus arbitration with <6.5 ns skew between channels.
Legacy System Backplane	Industrial Control I/O Expansion
Use Scenario: Extending ISA or STD bus signals across a multi-slot backplane with signal integrity preservation. IC Role / Device Role / Timing Role: Signal repeater and fanout amplifier for address/data/control lines; placed near slot connectors to compensate trace loss. Use Value: Maintains TTL noise margins over 20 cm backplane runs; supports full bus bandwidth without added latency.	Use Scenario: Isolating PLC CPU I/O expansion modules from main controller bus to prevent fault propagation. IC Role / Device Role / Timing Role: Directionally controlled buffer for 8-bit status/command words between CPU and remote I/O racks. Use Value: Enables modular system design with hot-swap capability; 3-state disable prevents module removal from disrupting bus operation.

Memory Address Buffering

Parallel Bus Interface

Use Scenario: Driving 16-bit address lines from a microprocessor to multiple memory chips on a shared bus.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from memory address inputs; enabled only during memory access cycles.

Use Value: Prevents address bus contention during DMA or peripheral access; ensures clean signal integrity across 15 cm traces at 10 MHz.

Use Scenario: Interfacing an 8-bit microcontroller data bus to multiple peripheral devices (ADC, DAC, UART) via a common parallel bus.

IC Role / Device Role / Timing Role: Bidirectional bus driver enabling controlled data flow between master and slaves using separate OE control per channel.

Use Value: Eliminates need for discrete transceivers; supports hot-swap-safe bus arbitration with <6.5 ns skew between channels.

Legacy System Backplane

Industrial Control I/O Expansion

Use Scenario: Extending ISA or STD bus signals across a multi-slot backplane with signal integrity preservation.

IC Role / Device Role / Timing Role: Signal repeater and fanout amplifier for address/data/control lines; placed near slot connectors to compensate trace loss.

Use Value: Maintains TTL noise margins over 20 cm backplane runs; supports full bus bandwidth without added latency.

Use Scenario: Isolating PLC CPU I/O expansion modules from main controller bus to prevent fault propagation.

IC Role / Device Role / Timing Role: Directionally controlled buffer for 8-bit status/command words between CPU and remote I/O racks.

Use Value: Enables modular system design with hot-swap capability; 3-state disable prevents module removal from disrupting bus operation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74LS244N	Lower drive (I_OL = 24 mA), slower (t_P ≤ 19 ns), same SOP-20 pinout	Reduced fanout and speed; suitable only for low-frequency (<5 MHz), low-load systems	Select when lower power consumption and legacy LS-family compatibility outweigh speed requirements.
SN74HC244N	CMOS process, wider V_CC (2–6 V), higher Z_IN, but lower I_OL (≤4 mA @ 4.5 V)	Not TTL-compatible; requires level translation if interfacing with 5 V TTL; better for mixed-voltage or battery-powered designs	Choose only with verified voltage-level alignment; not drop-in for TTL bus systems.

Compared with SN74LS244N, SN74F244NSRE4 offers 2.7× higher output drive and 3× faster propagation-critical for dense backplanes. Versus SN74HC244N, it provides native TTL interoperability and robust bus-driving strength, but lacks wide-supply flexibility.

Availability

SN74F244NSRE4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy computing data buses, and memory address buffering requiring stable component supply and long-term obsolescence management.

Supply support for SN74F244NSRE4 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 logic solutions with over 90 years of innovation in industrial, automotive, and communications markets.

The SN74F244NSRE4 belongs to TI's 74F family of fast TTL logic devices, engineered for high-speed, high-drive digital interfacing in legacy and upgrade systems where timing precision and bus-loading resilience are critical.

FAQ

What is the maximum operating temperature range for the SN74F244NSRE4?

The SN74F244NSRE4 is characterized for operation from 0°C to 70°C, meeting commercial-grade environmental specifications. This range is validated per TI's recommended operating conditions and applies specifically to the SN74F244NSRE4 variant in SOP-20 packaging. Exceeding 70°C may cause parametric shift or reliability degradation; for extended temperature applications, consider the military-grade SN54F244J.

Does the SN74F244NSRE4 support true bidirectional data flow?

No, the SN74F244NSRE4 is a unidirectional noninverting buffer: data flows only from A inputs to Y outputs. It does not support automatic direction sensing or internal bus turnaround. Bidirectional operation requires external control of the two OE pins and careful sequencing-e.g., disabling one channel before enabling the other-to avoid bus contention. The device itself has no built-in direction control logic.

Can the SN74F244NSRE4 be used with 3.3 V logic systems?

The SN74F244NSRE4 is not 3.3 V compatible: its absolute minimum V_CC is 4.5 V, and input thresholds (V_IH ≥ 2.0 V) assume 5 V operation. Driving its inputs from 3.3 V sources risks marginal high-level recognition and increased static power due to input stage forward-biasing. For 3.3 V systems, TI recommends the SN74LVC244A or similar LVC-family devices with 3.3 V tolerance and 5 V tolerant inputs.

What is the pin 1 marking convention for the SN74F244NSRE4 SOP-20 package?

The SN74F244NSRE4 in SOP-20 (NS) packaging uses a molded index notch or beveled corner at the top-left corner of the package (when leads point downward and pin 1 is at top-left). Per TI DW0020A drawing, pin 1 is located adjacent to this index feature, and the part marking "74F244" appears on the top surface near pin 1. No dot or additional symbol is used-orientation is defined solely by the physical index.

Is the SN74F244NSRE4 RoHS compliant and lead-free?

Yes, the SN74F244NSRE4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's Package Option Addendum. It meets EU RoHS Directive 2011/65/EU requirements and is rated Level-1-260°C-UNLIM for moisture sensitivity. The "E4" suffix explicitly denotes TI's green, lead-free, RoHS-compliant packaging standard.

SN74F244NSRE4 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 74F

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

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:: 15mA, 64mA

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SO

SN74F244NSRE4 FAQ

1.How can I place an order for SN74F244NSRE4 through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F244NSRE4 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 SN74F244NSRE4 reliable?

The price and inventory of SN74F244NSRE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F244NSRE4 is usually 5 days.

3.What payment methods are accepted for SN74F244NSRE4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F244NSRE4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F244NSRE4?

SN74F244NSRE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F244NSRE4 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 SN74F244NSRE4?

For technical support, including SN74F244NSRE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F244NSRE4 requirements.

6.How does Aetrix verify that SN74F244NSRE4 is sourced from the original manufacturer or authorized distributors?

All SN74F244NSRE4 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 SN74F244NSRE4 meets industry standards.

7.What is the process for return or replacement of SN74F244NSRE4?

All SN74F244NSRE4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74F244NSRE4, 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 SN74F244NSRE4 part is unused and in its original packaging.

Return procedure for SN74F244NSRE4:

1.Submit a request within 90 days.

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

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