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

Texas Instruments SN74F2244N

Name: SN74F2244N
Brand: Texas Instruments
SKU: SN74F2244N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F2244N

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74F2244N.pdf

Description:: BUS DRIVER

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Product details

Overview

SN74F2244N from Texas Instruments is an octal 3-state non-inverting buffer/line driver with dual enable controls, designed for memory address bus driving and clock distribution in TTL-compatible systems. It features 25-Ω series output resistors to suppress ringing, operates at 4.5–5.5 V, delivers ±15 mA output drive, and supports 0°C to 70°C industrial temperature range.

For engineers reviewing the SN74F2244N datasheet, SN74F2244N pinout, SN74F2244N application, or SN74F2244N equivalent, key selection criteria include its dual 4-bit 3-state architecture, integrated 25-Ω output termination, propagation delays under 8 ns, and compatibility with legacy 300-mil DIP-based memory and bus systems.

Technical Context

This device integrates two independent 4-bit buffer sections (1A–1Y and 2A–2Y), each with separate active-low 3-state enable inputs (1OE, 2OE). Its internal totem-pole outputs incorporate 25-Ω series resistors per channel to dampen signal reflections on unterminated transmission lines.

It complies with standard TTL input thresholds (V_IL = 0.8 V, V_IH = 2.0 V) and delivers guaranteed VOL ≤ 0.75 V at I_OL = 12 mA and VOH ≥ 2.0 V at I_OH = −15 mA, ensuring robust noise margins in mixed-logic backplanes.

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 without regulation.
Output Drive	±15 mA - Sufficient to directly drive 50-Ω transmission lines or load 10+ TTL inputs without external buffers.
Propagation Delay	t_PLH/t_PHL ≤ 8 ns - Enables reliable operation in 100+ MHz address/clock distribution paths with tight timing budgets.
3-State Enable Time	t_PZL ≤ 12 ns - Allows fast bus arbitration and dynamic bus sharing between multiple drivers.
Integrated Termination	25-Ω series resistor per output - Eliminates need for discrete series resistors, reducing BOM count and PCB area in bus designs.
Operating Temperature	0°C to 70°C - Qualified for commercial and industrial control applications with ambient thermal cycling.
Input Thresholds	V_IL ≤ 0.8 V, V_IH ≥ 2.0 V - Fully compatible with standard TTL logic families without level-shifting.

Pinout & Package

SN74F2244N uses a 20-pin plastic DIP (300-mil) package (Package Drawing N), 7.62 mm pitch, 24.13 mm length, 6.35 mm width, 4.57 mm height. Pin 1 marked by notch or dot.

Pin/Terminal	Circuit Role	Design Meaning
1, 11	1OE, 2OE	Active-low 3-state enable inputs - Independently disable each 4-bit section to prevent bus contention.
4, 6, 8, 18	1A1–1A4	Section 1 data inputs - Accept TTL-level address or control signals for first 4-bit group.
13, 15, 17, 19	2A1–2A4	Section 2 data inputs - Accept second set of 4-bit parallel signals, electrically isolated from Section 1.
2, 12, 14, 16	1Y1–1Y4	Section 1 buffered non-inverting outputs - Drive bus lines or memory address registers with 25-Ω series termination.
3, 5, 7, 9	2Y1–2Y4	Section 2 buffered non-inverting outputs - Provide matched drive strength and delay characteristics to Section 1 outputs.
10	GND	Ground reference - Must be low-impedance connection to minimize ground bounce during simultaneous switching.
20	V_CC	+5 V supply - Requires local 0.1 µF ceramic decoupling capacitor placed within 5 mm of pin.

Key Features

Feature	Design Value
Dual independent 4-bit buffers	Enables split-bus architectures - e.g., upper/lower byte addressing or clock/data separation without inter-section crosstalk.
25-Ω series output resistors	Reduces overshoot/ringing on FR-4 traces up to 10 cm long, eliminating 8 external resistors per device in typical memory bus layouts.
Low propagation delay (≤8 ns)	Supports address setup times for 12-ns static RAMs and allows >100 MHz clock distribution in synchronous systems.
Guaranteed 3-state isolation (IOZL/IOZH ≤ ±50 µA)	Prevents leakage-induced bus corruption when disabled - critical for hot-swap or multi-master bus arbitration.
TTL-compatible input/output levels	Direct interface with 74LS, 74AS, and microprocessor address/data buses without level translators or pull-ups.

Applications

Memory Address Buffering	Parallel Bus Transceiver Interface
Use Scenario: Driving 16-bit address bus from microprocessor to multiple SRAM/ROM chips on a shared backplane. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fanout and impedance-controlled drive for address lines A0–A15. Use Value: Integrated 25-Ω resistors suppress reflections on unterminated 6-inch PCB traces, eliminating timing jitter that causes address decode errors.	Use Scenario: Bidirectional data path control between CPU and peripheral ASIC using shared 8-bit data bus with direction-select logic. IC Role / Device Role / Timing Role: Dual-section buffer enabling independent gating of high/low nibble data lanes under separate OE control. Use Value: t_PZL ≤ 12 ns ensures clean bus release before next master asserts drive, preventing data collision in multi-drop configurations.
Clock Distribution Network	Legacy System Bus Expansion
Use Scenario: Distributing system clock (e.g., 25 MHz) to multiple TTL logic blocks while maintaining edge integrity. IC Role / Device Role / Timing Role: Low-skew, terminated clock driver replicating single clock source to 8 destinations with matched delay. Use Value: Matched t_PLH/t_PHL ≤ 8 ns and integrated termination ensure <100 ps skew across all 8 outputs, preserving setup/hold margins.	Use Scenario: Adding ISA-compatible I/O expansion slots to industrial controller with existing 8-bit data/address bus. IC Role / Device Role / Timing Role: Address latch enable and data bus isolation buffer compliant with ISA timing requirements and physical layout constraints. Use Value: 300-mil DIP footprint and 0–70°C rating allow drop-in replacement in legacy board designs without rework or thermal derating.

Memory Address Buffering

Parallel Bus Transceiver Interface

Use Scenario: Driving 16-bit address bus from microprocessor to multiple SRAM/ROM chips on a shared backplane.

IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fanout and impedance-controlled drive for address lines A0–A15.

Use Value: Integrated 25-Ω resistors suppress reflections on unterminated 6-inch PCB traces, eliminating timing jitter that causes address decode errors.

Use Scenario: Bidirectional data path control between CPU and peripheral ASIC using shared 8-bit data bus with direction-select logic.

IC Role / Device Role / Timing Role: Dual-section buffer enabling independent gating of high/low nibble data lanes under separate OE control.

Use Value: t_PZL ≤ 12 ns ensures clean bus release before next master asserts drive, preventing data collision in multi-drop configurations.

Clock Distribution Network

Legacy System Bus Expansion

Use Scenario: Distributing system clock (e.g., 25 MHz) to multiple TTL logic blocks while maintaining edge integrity.

IC Role / Device Role / Timing Role: Low-skew, terminated clock driver replicating single clock source to 8 destinations with matched delay.

Use Value: Matched t_PLH/t_PHL ≤ 8 ns and integrated termination ensure <100 ps skew across all 8 outputs, preserving setup/hold margins.

Use Scenario: Adding ISA-compatible I/O expansion slots to industrial controller with existing 8-bit data/address bus.

IC Role / Device Role / Timing Role: Address latch enable and data bus isolation buffer compliant with ISA timing requirements and physical layout constraints.

Use Value: 300-mil DIP footprint and 0–70°C rating allow drop-in replacement in legacy board designs without rework or thermal derating.

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
SN74LS244N	Lower drive (±15 mA same), higher propagation delay (15–20 ns), no integrated 25-Ω resistors.	Requires external series termination for clean edges on >5 cm traces; suitable only for lower-frequency (<30 MHz) systems.	Select when cost sensitivity outweighs signal integrity needs and board space permits discrete resistors.
SN74F244N	Same F-family speed (≤8 ns), identical pinout and 3-state behavior, but lacks integrated 25-Ω output resistors.	Needs external 22–33 Ω series resistors per line to match SN74F2244N's ringing suppression performance.	Choose if existing design already includes external termination or when sourcing flexibility favors broader distributor stock.

Compared with SN74LS244N and SN74F244N, the SN74F2244N uniquely combines F-series speed, dual-enable architecture, and monolithic 25-Ω termination - reducing component count and improving signal fidelity in memory and bus-critical designs without layout changes.

Availability

SN74F2244N is available at Aetrix Electronics and suitable for memory address buffering, parallel bus interfacing, and clock distribution applications requiring stable component supply and legacy DIP footprint compatibility.

Supply support for SN74F2244N 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74F2244N belongs to TI's 74F logic family - engineered for high-speed TTL-compatible operation with optimized power-delay tradeoffs in memory and bus interface applications.

FAQ

What is the function of the 25-Ω resistors inside SN74F2244N?

The 25-Ω resistors are integrated series termination elements placed within each output driver stage of the SN74F2244N. They dampen signal reflections on PCB traces by matching typical FR-4 characteristic impedance (50–75 Ω) in series with the driver's output impedance. This eliminates the need for eight external resistors in standard memory bus implementations and improves edge fidelity without altering layout.

Does SN74F2244N support mixed-voltage interfacing, such as 3.3 V logic inputs?

No. The SN74F2244N is a 5-V-only TTL-family device with V_IL = 0.8 V and V_IH = 2.0 V thresholds, and absolute maximum input voltage of 7 V. It does not tolerate sustained 3.3 V logic inputs as valid high-level signals - those fall below the guaranteed V_IH margin and may cause unreliable switching. Direct interface with 3.3 V systems requires level translation.

Can SN74F2244N replace SN74F244N in an existing design?

Yes, the SN74F2244N is pin-compatible and functionally identical to the SN74F244N, except for the integrated 25-Ω output resistors. In designs where external series termination is already present, SN74F2244N can be substituted without modification. Where no external resistors exist, SN74F2244N provides superior signal integrity out-of-the-box on unterminated traces.

What is the maximum capacitive load SN74F2244N can drive while maintaining specified timing?

The SN74F2244N's switching characteristics (t_PLH, t_PHL) are characterized at C_L = 50 pF. While it can drive higher loads, propagation delay increases linearly with capacitance - e.g., at 100 pF, delays increase ~30%. For reliable operation within datasheet specs, total load (including trace, probe, and input capacitance) must remain ≤50 pF unless timing margins are relaxed. The 25-Ω resistor helps stabilize edge rate under varying C_L.

Is SN74F2244N still in production, and what is its lifecycle status?

Texas Instruments lists SN74F2244N as OBSOLETE in its official packaging addendum. However, Aetrix Electronics maintains verified legacy inventory with full traceability and extended availability support. Units are sourced from original manufacturer stock or authorized channels, with full documentation and compliance verification for continued use in maintenance, repair, and legacy production programs.

SN74F2244N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: *

Package/Case:: -

Packaging:: Bulk

Product Status:: Active

Logic Type:: -

Number of Elements:: -

Number of Bits per Element:: -

Input Type:: -

Output Type:: -

Current - Output High, Low:: -

Voltage - Supply:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: -

Supplier Device Package:: -

SN74F2244N FAQ

1.How can I place an order for SN74F2244N through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F2244N 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 SN74F2244N reliable?

The price and inventory of SN74F2244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F2244N is usually 5 days.

3.What payment methods are accepted for SN74F2244N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F2244N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F2244N?

SN74F2244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F2244N 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 SN74F2244N?

For technical support, including SN74F2244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F2244N requirements.

6.How does Aetrix verify that SN74F2244N is sourced from the original manufacturer or authorized distributors?

All SN74F2244N 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 SN74F2244N meets industry standards.

7.What is the process for return or replacement of SN74F2244N?

All SN74F2244N units undergo pre-shipment inspection (PSI). If there is an issue with SN74F2244N, 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 SN74F2244N part is unused and in its original packaging.

Return procedure for SN74F2244N:

1.Submit a request within 90 days.

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

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