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

Texas Instruments SN74F2244DBR

Name: SN74F2244DBR
Brand: Texas Instruments
SKU: SN74F2244DBR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74F2244DBR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74F2244DBR.pdf

Description:: BUS DRIVER

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Product details

Overview

SN74F2244DBR 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 integrated output series resistors to suppress ringing, operates at 4.5–5.5 V supply, delivers ±15 mA output drive, and supports 0°C to 70°C industrial temperature range.

For engineers reviewing the SN74F2244DBR datasheet, SN74F2244DBR pinout, SN74F2244DBR application, or SN74F2244DBR equivalent, key selection criteria include its dual independent 4-bit channel architecture, 3-state output timing (tPZL ≤ 12 ns), bus-hold-free TTL input compatibility, and SSOP-20 package suitability for high-density board layouts.

Technical Context

The SN74F2244DBR implements two independent 4-bit buffered paths, each with separate active-low output-enable (1OE, 2OE) inputs controlling four non-inverting outputs (1Y1–1Y4 and 2Y1–2Y4). Its internal 25-Ω series resistors are integrated into the lower leg of each totem-pole output stage, eliminating external termination components required for impedance matching on transmission lines.

It adheres to standard F-series TTL logic thresholds (VIL = 0.8 V, VIH = 2.0 V), guarantees VOL ≤ 0.75 V at IOL = 12 mA, VOH ≥ 2.0 V at IOH = −15 mA, and exhibits propagation delays tPLH/tPHL ≤ 8 ns under 50-pF load conditions - optimized for synchronous bus interface and address latch applications.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures robust operation across standard 5-V TTL rail tolerances without regulation overhead.
Output Drive	±15 mA - sufficient to directly drive multiple TTL loads or terminate short PCB traces without external buffers.
Propagation Delay	tPLH/tPHL ≤ 8 ns @ CL = 50 pF - enables reliable timing in 25+ MHz address/data bus systems.
Enable Timing	tPZL ≤ 12 ns, tPHZ ≤ 9.5 ns - supports fast bus arbitration and dynamic output control in multiplexed architectures.
Input Thresholds	VIL = 0.8 V, VIH = 2.0 V - fully compatible with legacy TTL and LSTTL logic families without level shifting.
Integrated Termination	25-Ω series resistor per output - eliminates need for discrete 22–33 Ω SMT resistors, reducing BOM count and layout area.
Operating Temperature	0°C to 70°C - qualified for commercial and industrial ambient environments in computing and instrumentation equipment.

Pinout & Package

SN74F2244DBR is housed in a 20-pin Plastic Small-Outline (SSOP) package (DB), 7.4 mm × 5.3 mm body size, 0.65 mm lead pitch, 1.2 mm max height - optimized for automated assembly and space-constrained designs.

Pin/Terminal	Circuit Role	Design Meaning
1OE	Active-low enable for Channel 1 (1A1–1A4 → 1Y1–1Y4)	Drives all four Channel 1 outputs to high-impedance when high; enables pass-through when low.
2OE	Active-low enable for Channel 2 (2A1–2A4 → 2Y1–2Y4)	Independent control allows time-multiplexed or partitioned bus access between two 4-bit groups.
1A1–1A4, 2A1–2A4	Non-inverting data inputs	Direct TTL-compatible inputs accepting 0.8 V / 2.0 V thresholds; no pull-up/pull-down required.
1Y1–1Y4, 2Y1–2Y4	3-state non-inverting buffered outputs	Each includes integrated 25-Ω series resistor; capable of sourcing/sinking ±15 mA in active state.
VCC (Pin 20)	Positive supply	Must be decoupled locally; supports 4.5–5.5 V with ICC ≤ 90 mA (all outputs active).
GND (Pin 10)	Ground reference	Common return for logic and output current; requires low-inductance connection to minimize noise coupling.

Key Features

Feature	Design Value
Dual independent 4-bit channels	Enables split-bus addressing (e.g., upper/lower byte) or parallel clock distribution with separate gating control.
Integrated 25-Ω output series resistors	Eliminates 8 external termination resistors, reduces signal reflections on FR-4 traces up to 10 cm length.
3-state output timing symmetry	tPZL ≈ tPLZ and tPHZ ≈ tPLZ ensure deterministic bus release and acquisition windows for arbitration logic.
TTL-compatible input thresholds	Direct interfacing with 74LS, 74F, and microcontroller GPIO without level translation circuitry.
Low propagation skew	≤1 ns inter-output delay variation within each channel ensures simultaneous address bit assertion for memory decoding.

Applications

Memory Address Buffering	System Clock Distribution
Use Scenario: Driving 16-bit address bus from microprocessor to multiple SRAM/ROM chips in a shared-memory architecture. IC Role / Device Role / Timing Role: Octal buffer isolating CPU address pins from capacitive bus loading while enabling/disabling segments via 1OE/2OE. Use Value: Integrated 25-Ω resistors suppress overshoot on 50-cm PCB traces; tPHL ≤ 8 ns ensures setup time compliance for 25-MHz bus cycles.	Use Scenario: Distributing a master system clock to four peripheral controllers and four memory banks with synchronized enable control. IC Role / Device Role / Timing Role: Dual-channel fanout buffer providing matched-delay clock copies with independent gating per subsystem. Use Value: Identical tPLH/tPHL across all eight outputs minimizes clock skew (<1 ns); 3-state capability allows dynamic clock disabling during sleep modes.
Bus Transceiver Interface	Legacy Peripheral Expansion
Use Scenario: Bidirectional data bus isolation between ISA-style expansion slot and host controller using external direction logic. IC Role / Device Role / Timing Role: Unidirectional 3-state driver acting as half of a transceiver pair; enabled only during write cycles. Use Value: Fast tPZL ≤ 12 ns enables rapid bus release after write completion; ±15 mA drive sustains signal integrity across 10-load bus stubs.	Use Scenario: Interfacing vintage 8-bit microcontrollers (e.g., Z80, 8085) with modern peripherals requiring clean address latching. IC Role / Device Role / Timing Role: Address latch driver buffering multiplexed AD0–AD7 signals before demultiplexing into A0–A7 and D0–D7. Use Value: Guaranteed VOL ≤ 0.75 V at 12 mA ensures noise margin >400 mV against TTL inputs; 0°C–70°C rating matches industrial controller requirements.

Memory Address Buffering

System Clock Distribution

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

IC Role / Device Role / Timing Role: Octal buffer isolating CPU address pins from capacitive bus loading while enabling/disabling segments via 1OE/2OE.

Use Value: Integrated 25-Ω resistors suppress overshoot on 50-cm PCB traces; tPHL ≤ 8 ns ensures setup time compliance for 25-MHz bus cycles.

Use Scenario: Distributing a master system clock to four peripheral controllers and four memory banks with synchronized enable control.

IC Role / Device Role / Timing Role: Dual-channel fanout buffer providing matched-delay clock copies with independent gating per subsystem.

Use Value: Identical tPLH/tPHL across all eight outputs minimizes clock skew (<1 ns); 3-state capability allows dynamic clock disabling during sleep modes.

Bus Transceiver Interface

Legacy Peripheral Expansion

Use Scenario: Bidirectional data bus isolation between ISA-style expansion slot and host controller using external direction logic.

IC Role / Device Role / Timing Role: Unidirectional 3-state driver acting as half of a transceiver pair; enabled only during write cycles.

Use Value: Fast tPZL ≤ 12 ns enables rapid bus release after write completion; ±15 mA drive sustains signal integrity across 10-load bus stubs.

Use Scenario: Interfacing vintage 8-bit microcontrollers (e.g., Z80, 8085) with modern peripherals requiring clean address latching.

IC Role / Device Role / Timing Role: Address latch driver buffering multiplexed AD0–AD7 signals before demultiplexing into A0–A7 and D0–D7.

Use Value: Guaranteed VOL ≤ 0.75 V at 12 mA ensures noise margin >400 mV against TTL inputs; 0°C–70°C rating matches industrial controller requirements.

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
SN74F244N	Same logic function and pinout, but in 20-pin PDIP (N) package; lacks integrated 25-Ω resistors.	Requires external series termination resistors for EMI control; better suited for prototyping or through-hole assembly.	Select SN74F244N only if DIP footprint or absence of built-in termination is required for legacy board reuse.
SN74LS244N	Lower drive (±15 mA same, but VOH/VOL specs looser), higher propagation delay (tPLH ≤ 22 ns), no integrated resistors.	Higher power consumption per channel (ICC ≈ 30 mA vs. 15 mA typical for F-series); unsuitable for high-speed buses >10 MHz.	Choose SN74LS244N only for cost-sensitive, low-frequency (<5 MHz), through-hole designs where speed and EMI are not critical.

Compared with SN74F244N and SN74LS244N, the SN74F2244DBR provides superior signal integrity via on-die 25-Ω resistors, faster timing (≤8 ns vs. ≥22 ns), and SSOP packaging for density - making it the optimal choice for new 5-V TTL bus designs demanding reliability and layout efficiency.

Availability

SN74F2244DBR is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus interface, and legacy microcontroller expansion requiring stable component supply and long-term obsolescence management support.

Supply support for SN74F2244DBR 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 SN74F2244DBR belongs to TI's 74F logic family - engineered for high-speed TTL-compatible operation with improved noise immunity and reduced power-delay product versus earlier 74LS and 74S series.

FAQ

What is the primary function of the SN74F2244DBR in digital systems?

The SN74F2244DBR functions as an octal 3-state non-inverting buffer with dual enable controls, primarily used to drive memory address buses, clock lines, and data buses in TTL-based systems. Its integrated 25-Ω output resistors suppress signal ringing, and its 0°C to 70°C operating range supports industrial computing applications. The SN74F2244DBR enables clean signal transmission without external termination components.

Does the SN74F2244DBR require external pull-up or pull-down resistors on its inputs?

No, the SN74F2244DBR does not require external pull-up or pull-down resistors on its inputs. Its TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and specified IIH/IIL values (±1.6 mA) ensure reliable logic-level recognition when driven directly by standard TTL or microcontroller GPIO outputs. The SN74F2244DBR inputs are designed for direct connection without biasing components.

Can the SN74F2244DBR be used in place of the SN74F244 in existing designs?

The SN74F2244DBR shares identical logic functionality and pinout with the SN74F244, but adds integrated 25-Ω output series resistors - meaning it can replace SN74F244 in most cases without layout changes, provided the SSOP-20 footprint is accommodated. However, the SN74F2244DBR's DB package differs from the SN74F244's DW or N packages, so mechanical compatibility must be verified. The SN74F2244DBR improves signal integrity over the SN74F244 in high-speed routing scenarios.

What is the maximum capacitive load the SN74F2244DBR can drive while maintaining specified timing?

The SN74F2244DBR is characterized for switching performance with a 50-pF capacitive load, delivering tPLH/tPHL ≤ 8 ns and tPZL ≤ 12 ns under recommended operating conditions (VCC = 4.5–5.5 V, TA = 0°C–70°C). While it can drive higher capacitance, timing parameters degrade predictably beyond 50 pF; for loads exceeding 75 pF, derating analysis or simulation is recommended. The SN74F2244DBR's integrated 25-Ω resistors help stabilize edge rates up to ~100 pF on short traces.

Is the SN74F2244DBR still in active production, and what is its obsolescence status?

The SN74F2244DBR is marked as OBSOLETE by Texas Instruments per its official packaging addendum, indicating discontinued production. However, Aetrix Electronics maintains legacy inventory and offers lifecycle management services including last-time buys, cross-reference support, and form-fit-function alternatives. Customers designing new systems should evaluate migration paths, but the SN74F2244DBR remains viable for repair, replacement, and continuity programs where original-spec compliance is mandatory.

SN74F2244DBR 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:: -

SN74F2244DBR FAQ

1.How can I place an order for SN74F2244DBR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74F2244DBR 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 SN74F2244DBR reliable?

The price and inventory of SN74F2244DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74F2244DBR is usually 5 days.

3.What payment methods are accepted for SN74F2244DBR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74F2244DBR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74F2244DBR?

SN74F2244DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74F2244DBR 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 SN74F2244DBR?

For technical support, including SN74F2244DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74F2244DBR requirements.

6.How does Aetrix verify that SN74F2244DBR is sourced from the original manufacturer or authorized distributors?

All SN74F2244DBR 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 SN74F2244DBR meets industry standards.

7.What is the process for return or replacement of SN74F2244DBR?

All SN74F2244DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74F2244DBR, 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 SN74F2244DBR part is unused and in its original packaging.

Return procedure for SN74F2244DBR:

1.Submit a request within 90 days.

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

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