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

Texas Instruments SN74BCT244DB

Name: SN74BCT244DB
Brand: Texas Instruments
SKU: SN74BCT244DB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN74BCT244DB

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN74BCT244DB.pdf

Description:: BUFF/DVR TRI-ST DUAL 20SSOP

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Product details

Overview

SN74BCT244DB from Texas Instruments is a noninverting octal buffer/line driver with dual 4-bit sections, 3-state outputs, and separate active-low output-enable (OE) inputs per section. It operates at 4.5–5.5 V, delivers 64 mA low-level output current, supports 0°C to 70°C industrial temperature range, and is packaged in a 20-pin SSOP (DB) for high-density bus interfacing in memory address and clock distribution systems.

For engineers reviewing the SN74BCT244DB datasheet, SN74BCT244DB pinout, SN74BCT244DB application, or SN74BCT244DB equivalent, key selection criteria include its BiCMOS logic architecture, 5 ns max propagation delay, ±50 µA high-impedance leakage, 4 mA ICCZ quiescent supply current, and compatibility with TTL-level input thresholds and 5-V CMOS bus loading requirements.

Technical Context

The SN74BCT244DB implements two independent 4-bit noninverting buffers, each controlled by its own OE input. Data flows unidirectionally from A inputs to Y outputs when OE is low; outputs enter high-impedance state when OE is high. Its BiCMOS design combines bipolar input stages (for TTL-compatible VIH/VIL) with CMOS output drivers (for rail-to-rail swing and low ICCZ).

Input structure uses P-N-P transistors to minimize DC loading on driving sources, while ESD protection exceeds 2000 V per MIL-STD-883C Method 3015. The device meets standard 5-V TTL logic levels and drives 50-pF loads with tPLH/tPHL ≤ 5 ns at VCC = 5 V and TA = 25°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - Ensures robust operation across standard 5-V power rail tolerances.
Output Drive Current	64 mA (IOL, max) - Sufficient to drive multiple TTL loads or 50-pF transmission lines without signal degradation.
Propagation Delay	5 ns (tPHL max, A→Y) - Enables reliable timing in high-speed address/data bus applications up to ~100 MHz.
Quiescent Supply Current	4 mA (ICCZ, max) - Low static power draw during 3-state idle mode, critical for system-level power budgeting.
Input Thresholds	VIL = 0.8 V, VIH = 2.0 V - Fully compatible with legacy TTL logic families for seamless integration.
High-Z Leakage	±50 µA (IOZL/IOZH) - Minimizes bus contention risk and signal integrity loss when outputs are disabled.
Operating Temperature	0°C to 70°C - Qualified for commercial and industrial ambient environments without derating.

Pinout & Package

SN74BCT244DB is housed in a 20-pin Shrink Small-Outline Package (SSOP), DB package type, with 0.65 mm lead pitch, body dimensions 7.5 mm × 5.6 mm, and JEDEC MO-150 compliance.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output-enable control	Independent enable for Section 1 (pins 1A1–1A4 → 1Y1–1Y4) and Section 2 (2A1–2A4 → 2Y1–2Y4); asserts 3-state when high.
1A1–1A4, 2A1–2A4	Buffer input terminals	Noninverting data inputs; accept TTL-compatible logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V).
1Y1–1Y4, 2Y1–2Y4	Buffer output terminals	3-state CMOS/TTL-compatible outputs; sink up to 64 mA or source up to 15 mA.
VCC (Pin 20)	Positive supply	Primary 4.5–5.5 V power connection; decoupling required near pin for noise immunity.
GND (Pin 10)	Ground reference	Common return path for all I/O and supply currents; must be low-impedance for signal integrity.

Key Features

Feature	Design Value
BiCMOS architecture	Combines TTL-compatible P-N-P inputs with CMOS outputs to reduce ICCZ by >50% vs. pure bipolar equivalents.
Separate OE controls	Enables independent gating of two 4-bit data paths-ideal for split-bus or multi-zone memory addressing.
ESD protection	Exceeds 2000 V HBM-meets MIL-STD-883C Method 3015, reducing board-level ESD hardening requirements.
Low DC input loading	P-N-P input stage draws ≤1 mA IIL at VI = 0.5 V-preserves fanout margin when driving from weak sources.
Bus-oriented 3-state outputs	Outputs fully disconnect from bus when disabled-prevents contention in shared-address or shared-data architectures.

Applications

Memory Address Buffering	Clock Distribution
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM chips in a compact embedded system. IC Role / Device Role / Timing Role: Noninverting octal buffer isolating CPU address lines; enables fanout expansion and noise isolation between master and memory peripherals. Use Value: 64 mA drive strength ensures clean edges into capacitive bus loads; 5 ns propagation delay preserves setup/hold timing margins at 20-MHz bus rates.	Use Scenario: Distributing a single system clock to four synchronous peripheral ICs (e.g., UART, ADC, timer, GPIO expander). IC Role / Device Role / Timing Role: Clock line driver with independent OE control per 4-bit section-allows dynamic clock gating to subsets of peripherals. Use Value: Matched tPLH/tPHL and low skew (<0.5 ns typical) maintain clock phase alignment across outputs, minimizing jitter accumulation.
Bus Transceiver Interface	Legacy System Expansion
Use Scenario: Interfacing a modern FPGA I/O bank (3.3-V LVTTL) to an older 5-V ISA-style data bus with bidirectional control logic. IC Role / Device Role / Timing Role: Unidirectional level-shifting buffer (with external direction control) providing 5-V tolerant inputs and 5-V compliant outputs. Use Value: VI = −0.5 V to 7 V rating allows safe operation with mixed-voltage signaling; 5.5-V VCC tolerance accommodates noisy 5-V rails.	Use Scenario: Retrofitting a vintage industrial controller with additional I/O modules while retaining original backplane wiring and timing. IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS244 in address/data latching circuits-maintains identical pinout and logic behavior. Use Value: Identical functional table and pin mapping to 'LS244; BiCMOS process improves speed and reduces power over original bipolar version.

Memory Address Buffering

Clock Distribution

Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM chips in a compact embedded system.

IC Role / Device Role / Timing Role: Noninverting octal buffer isolating CPU address lines; enables fanout expansion and noise isolation between master and memory peripherals.

Use Value: 64 mA drive strength ensures clean edges into capacitive bus loads; 5 ns propagation delay preserves setup/hold timing margins at 20-MHz bus rates.

Use Scenario: Distributing a single system clock to four synchronous peripheral ICs (e.g., UART, ADC, timer, GPIO expander).

IC Role / Device Role / Timing Role: Clock line driver with independent OE control per 4-bit section-allows dynamic clock gating to subsets of peripherals.

Use Value: Matched tPLH/tPHL and low skew (<0.5 ns typical) maintain clock phase alignment across outputs, minimizing jitter accumulation.

Bus Transceiver Interface

Legacy System Expansion

Use Scenario: Interfacing a modern FPGA I/O bank (3.3-V LVTTL) to an older 5-V ISA-style data bus with bidirectional control logic.

IC Role / Device Role / Timing Role: Unidirectional level-shifting buffer (with external direction control) providing 5-V tolerant inputs and 5-V compliant outputs.

Use Value: VI = −0.5 V to 7 V rating allows safe operation with mixed-voltage signaling; 5.5-V VCC tolerance accommodates noisy 5-V rails.

Use Scenario: Retrofitting a vintage industrial controller with additional I/O modules while retaining original backplane wiring and timing.

IC Role / Device Role / Timing Role: Drop-in replacement for obsolete 74LS244 in address/data latching circuits-maintains identical pinout and logic behavior.

Use Value: Identical functional table and pin mapping to 'LS244; BiCMOS process improves speed and reduces power over original bipolar version.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74ACT244DBR	AC-family CMOS; higher speed (tPD ≈ 3.5 ns), lower ICCZ (2 µA), but VIH = 2.0 V min same; no P-N-P input stage.	Preferred where ultra-low static power or tighter timing budgets exist; less tolerant of marginal TTL input drive.	Select SN74ACT244DBR for new designs prioritizing speed/power efficiency; retain SN74BCT244DB for proven TTL interface robustness.
SN74LVC244APWR	3.3-V only (1.65–3.6 V), LVCMOS; 32 mA IOL, 5 ns tPD, 3.3-V I/O compatible; not 5-V tolerant.	Suitable only in 3.3-V systems; requires level translation for 5-V bus interfacing.	Choose SN74LVC244APWR for cost-sensitive 3.3-V embedded designs; avoid if 5-V compatibility or mixed-voltage operation is required.

Compared with SN74ACT244DBR and SN74LVC244APWR, the SN74BCT244DB uniquely balances 5-V TTL interoperability, moderate speed, and low ICCZ within a legacy-pin-compatible SSOP package-making it optimal for industrial upgrades and mixed-signal bus buffering where voltage flexibility and proven reliability outweigh raw speed gains.

Availability

SN74BCT244DB is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus interfacing, and legacy system expansion requiring stable component supply and long-term industrial availability.

Supply support for SN74BCT244DB 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 SN74BCT244DB belongs to TI's Bipolar-CMOS-Transistor (BCT) logic family, engineered to replace legacy 74LS devices with improved speed, reduced power, and enhanced bus-driving capability in 5-V digital systems.

FAQ

What is the maximum operating temperature range for the SN74BCT244DB?

The SN74BCT244DB is characterized for operation from 0°C to 70°C, meeting commercial and extended industrial temperature requirements. This range is explicitly defined in the recommended operating conditions table of the SCBS006E datasheet and applies specifically to the DB-package variant. It does not support the −55°C to 125°C military range specified for the SN54BCT244 variants.

Does the SN74BCT244DB support 5-V tolerant inputs when operated at 5 V?

Yes, the SN74BCT244DB supports input voltages from −0.5 V to 7 V per absolute maximum ratings, making it fully 5-V tolerant. Its VIH and VIL thresholds (2.0 V and 0.8 V) align with standard TTL logic, allowing direct connection to 5-V microcontrollers, FPGAs, and other legacy logic without level shifters-confirmed in the electrical characteristics section of SCBS006E.

Can the SN74BCT244DB drive a 50-pF load with guaranteed timing at 5 V?

Yes, the SN74BCT244DB's switching characteristics are explicitly tested under CL = 50 pF, R1 = R2 = 500 Ω, and VCC = 5 V. At these conditions, tPLH and tPHL are guaranteed ≤ 5 ns, and tPZL/tPHZ ≤ 8.9 ns. These values are documented in the "Switching Characteristics" table of SCBS006E and apply directly to the SN74BCT244DB in DB package.

Is the SN74BCT244DB pin-compatible with the 74LS244?

Yes, the SN74BCT244DB maintains identical pinout, function table, and logic behavior as the 74LS244, including dual 4-bit noninverting buffers with independent active-low OE inputs. This compatibility is confirmed in TI's logic family migration guides and enables drop-in replacement in existing designs-though SN74BCT244DB offers superior speed and lower ICCZ.

What is the maximum output sink current specification for the SN74BCT244DB?

The SN74BCT244DB guarantees a minimum low-level output current (IOL) of 64 mA per output, as specified in the recommended operating conditions table under "SN74BCT244" row. This value is measured at VCC = 4.5 V and VOL = 0.55 V, and is validated across the full 0°C to 70°C operating range-enabling reliable driving of multiple TTL loads or moderately capacitive buses.

SN74BCT244DB 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:: -

SN74BCT244DB FAQ

1.How can I place an order for SN74BCT244DB through Aetrix?

Please submit a Request for Quotation (RFQ) for SN74BCT244DB 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 SN74BCT244DB reliable?

The price and inventory of SN74BCT244DB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT244DB is usually 5 days.

3.What payment methods are accepted for SN74BCT244DB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74BCT244DB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN74BCT244DB?

SN74BCT244DB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN74BCT244DB 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 SN74BCT244DB?

For technical support, including SN74BCT244DB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT244DB requirements.

6.How does Aetrix verify that SN74BCT244DB is sourced from the original manufacturer or authorized distributors?

All SN74BCT244DB 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 SN74BCT244DB meets industry standards.

7.What is the process for return or replacement of SN74BCT244DB?

All SN74BCT244DB units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT244DB, 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 SN74BCT244DB part is unused and in its original packaging.

Return procedure for SN74BCT244DB:

1.Submit a request within 90 days.

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

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