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

Texas Instruments SN64BCT244N

Name: SN64BCT244N
Brand: Texas Instruments
SKU: SN64BCT244N
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN64BCT244N

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-DIP (0.300", 7.62mm)

Datasheet:: SN64BCT244N.pdf

Description:: IC BUF NON-INVERT 5.5V 20DIP

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Product details

Overview

SN64BCT244N from Texas Instruments is an octal noninverting buffer/line driver with dual 4-bit sections, 3-state outputs, BiCMOS technology, and operation from −40°C to 85°C. It drives memory address buses and clock distribution lines with 64 mA sink current, 15 mA source current, and sub-6 ns propagation delay at 5 V. Used in legacy industrial control backplanes and ISA bus expansion interfaces.

For engineers reviewing the SN64BCT244N datasheet, SN64BCT244N pinout, SN64BCT244N application, or SN64BCT244N equivalent, key selection criteria include 3-state output timing (tPZL ≤ 9.4 ns), high-impedance behavior during power-up/down, P-N-P input structure for low DC loading, and compatibility with 5-V TTL/CMOS logic families.

Technical Context

The SN64BCT244N implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its BiCMOS architecture combines bipolar input stages for low input current and CMOS output stages for rail-to-rail swing and high drive strength.

Each output supports 64 mA sink and 15 mA source capability under 4.5–5.5 V supply, with guaranteed high-impedance state when VCC < ~3 V during power sequencing. Input clamp current rating of −18 mA enables robust ESD protection without external diodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL/CMOS systems and margin against rail droop.
Output Drive	64 mA sink / 15 mA source - sufficient to drive 50-pF loads across 10+ TTL inputs or stub-loaded buses.
Propagation Delay	tPLH/tPHL ≤ 5.3 ns @ 5 V - enables reliable operation in 80-MHz address/data strobe timing windows.
3-State Enable Time	tPZL ≤ 9.4 ns - guarantees fast bus release for time-critical multiplexed memory access.
Operating Temperature	−40°C to +85°C - qualified for industrial-grade embedded controller and instrumentation applications.
Input Structure	P-N-P input stage - reduces DC input loading to ≤1 mA, minimizing address bus contention current.
Power-Up Safety	High-Z below ~3 V - prevents bus contention during asymmetric power sequencing in multi-rail systems.

Pinout & Package

SN64BCT244N uses a 20-pin plastic DIP (300-mil) package with 2.54 mm pitch, 7.62 mm body width, and 2.65 mm max height per JEDEC MS-001. Pin 1 marked with notch or dot; pin 10 = GND, pin 20 = VCC.

Pin/Terminal	Circuit Role	Design Meaning
1OE, 2OE	Active-low output enable	Independent control of each 4-bit section; OE high forces Y outputs into high-impedance state.
1A1–1A4, 2A1–2A4	Noninverting data inputs	Direct connection to address/data lines; P-N-P inputs minimize steady-state loading on driving sources.
1Y1–1Y4, 2Y1–2Y4	Noninverting buffered outputs	Drive bus segments or memory address registers; capable of sinking 64 mA per output.
VCC (Pin 20)	Positive supply	5-V nominal; must be stable before enabling outputs to ensure defined high-Z behavior.
GND (Pin 10)	Ground reference	Common return for all I/O and internal circuitry; decoupling capacitor required near pin.

Key Features

Feature	Design Value
BiCMOS process technology	Combines low-input-current P-N-P inputs with high-drive CMOS outputs, reducing ICCZ to 4–10 mA vs. 23–80 mA in standard BCT.
Power-up/power-down high-impedance	Outputs remain tri-stated while VCC ramps through 0–3 V, eliminating bus conflicts during cold start or brownout.
Symmetrical active-low OE inputs	Both 1OE and 2OE share identical timing specs (tPZL/tPHZ ≤ 9.4 ns), enabling synchronized bus arbitration.
Input clamp current support	−18 mA clamp rating allows direct interface with hot-pluggable backplane signals without external protection diodes.
Industrial temperature range	−40°C to +85°C operation verified across full voltage range, supporting deployment in uncontrolled cabinet environments.

Applications

ISA Bus Address Buffering	Legacy Industrial Backplane Driver
Use Scenario: Driving 20-bit address bus in PC/AT-compatible ISA expansion slots where multiple cards share memory-mapped I/O space. IC Role / Device Role / Timing Role: Noninverting octal buffer providing isolation and fanout for A0–A19 signals, with 3-state control synchronized to I/O channel select. Use Value: Enables clean address decoding without bus contention during DMA cycles; tPZL ≤ 9.4 ns ensures timely bus release before next cycle.	Use Scenario: Interfacing microcontroller address/data buses to modular I/O racks in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Dual-section line driver isolating CPU address lines from noisy field-side bus traces, with independent OE control per rack segment. Use Value: P-N-P inputs reduce cumulative DC loading on MCU pins; high-Z during power-up prevents spurious writes to peripheral modules.
Memory Address Register Expansion	Clock Distribution Fanout
Use Scenario: Extending 16-bit address space to 24 bits in 80C188-based embedded controllers using external SRAM/Flash banks. IC Role / Device Role / Timing Role: Noninverting buffer amplifying upper address bits (A16–A19) to multiple memory chips with matched trace lengths. Use Value: 64 mA sink capability drives parallel address lines with minimal skew; tPLH ≤ 5.3 ns maintains setup/hold margins across 100 ns access cycles.	Use Scenario: Distributing system clock (e.g., 8–25 MHz) to multiple synchronous peripherals (UARTs, timers, ADCs) in legacy instrumentation. IC Role / Device Role / Timing Role: Low-skew clock buffer with 3-state output enabling dynamic clock gating per subsystem. Use Value: Sub-6 ns propagation delay and matched tPLH/tPHL preserve duty cycle integrity; high-Z mode eliminates clock feedthrough during sleep states.

ISA Bus Address Buffering

Legacy Industrial Backplane Driver

Use Scenario: Driving 20-bit address bus in PC/AT-compatible ISA expansion slots where multiple cards share memory-mapped I/O space.

IC Role / Device Role / Timing Role: Noninverting octal buffer providing isolation and fanout for A0–A19 signals, with 3-state control synchronized to I/O channel select.

Use Value: Enables clean address decoding without bus contention during DMA cycles; tPZL ≤ 9.4 ns ensures timely bus release before next cycle.

Use Scenario: Interfacing microcontroller address/data buses to modular I/O racks in programmable logic controllers (PLCs).

IC Role / Device Role / Timing Role: Dual-section line driver isolating CPU address lines from noisy field-side bus traces, with independent OE control per rack segment.

Use Value: P-N-P inputs reduce cumulative DC loading on MCU pins; high-Z during power-up prevents spurious writes to peripheral modules.

Memory Address Register Expansion

Clock Distribution Fanout

Use Scenario: Extending 16-bit address space to 24 bits in 80C188-based embedded controllers using external SRAM/Flash banks.

IC Role / Device Role / Timing Role: Noninverting buffer amplifying upper address bits (A16–A19) to multiple memory chips with matched trace lengths.

Use Value: 64 mA sink capability drives parallel address lines with minimal skew; tPLH ≤ 5.3 ns maintains setup/hold margins across 100 ns access cycles.

Use Scenario: Distributing system clock (e.g., 8–25 MHz) to multiple synchronous peripherals (UARTs, timers, ADCs) in legacy instrumentation.

IC Role / Device Role / Timing Role: Low-skew clock buffer with 3-state output enabling dynamic clock gating per subsystem.

Use Value: Sub-6 ns propagation delay and matched tPLH/tPHL preserve duty cycle integrity; high-Z mode eliminates clock feedthrough during sleep states.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal noninverting 3-state buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74BCT244N	Same pinout and function but rated only for 0°C to +70°C; lower ICCZ (3–8 mA) and slightly slower tPZL (≤10 ns).	Limited to commercial-temperature applications; not suitable for extended industrial environments.	Select SN74BCT244N only if ambient operating temperature remains above 0°C and cost sensitivity outweighs thermal margin.
SN64FCT244N	FCT-family CMOS variant; lower ICCZ (1–3 mA), faster tPLH (≤3.5 ns), but reduced output drive (32 mA sink) and no P-N-P inputs.	Better for high-speed, low-power systems with light bus loading; lacks DC loading advantage for legacy TTL-driven buses.	Choose SN64FCT244N when optimizing for speed/power in new designs with modern logic families; retain SN64BCT244N for backward compatibility with TTL loads.

Compared with SN74BCT244N and SN64FCT244N, the SN64BCT244N uniquely delivers industrial-temperature operation, P-N-P input loading reduction, and 64 mA drive-making it the only option among the three qualified for legacy 5-V bus systems requiring robustness across wide thermal and loading conditions.

Availability

SN64BCT244N is available at Aetrix Electronics and suitable for ISA bus expansion, industrial backplane interfacing, memory address register extension, and legacy clock distribution requiring stable component supply and long-term obsolescence management.

Supply support for SN64BCT244N 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 SN64BCT244N belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, designed specifically to enhance performance and density of 3-state memory address drivers, clock drivers, and bus-oriented receivers in 5-V systems.

FAQ

What is the operating temperature range for the SN64BCT244N?

The SN64BCT244N is characterized for operation from −40°C to +85°C. This industrial temperature rating is confirmed in the absolute maximum ratings and recommended operating conditions tables of the official datasheet (SCBS027A). It ensures reliable functionality in harsh environments such as factory automation cabinets or outdoor telecom enclosures where ambient temperatures fluctuate widely. The SN64BCT244N maintains specified timing and drive performance across this full range.

Does the SN64BCT244N have built-in power-up and power-down protection?

Yes, the SN64BCT244N enters a high-impedance state when the supply voltage is below approximately 3 V, which covers both power-up and power-down transitions. This behavior is explicitly documented in the device description and electrical characteristics (IOZ, IOZH, IOZL parameters). It prevents bus contention and unintended signal assertion during supply ramping-a critical feature for systems with asymmetric power sequencing. This protection is inherent to the BiCMOS design and requires no external circuitry.

What is the maximum output sink current supported by the SN64BCT244N?

The SN64BCT244N supports a maximum low-level output current (IOL) of 64 mA per output, tested under recommended operating conditions (VCC = 4.5 V, TA = −40°C to +85°C). This value is specified in the "electrical characteristics" table and enables direct driving of multiple TTL inputs or moderately loaded PCB traces without external buffers. Exceeding 64 mA risks violating VOL specifications or degrading long-term reliability, so load design must respect this limit for each Y output.

Is the SN64BCT244N pin-compatible with the SN74BCT244N?

Yes, the SN64BCT244N and SN74BCT244N share identical pinout, function, and package (20-pin DIP), making them physically interchangeable. However, they differ in temperature rating (SN64BCT244N: −40°C to +85°C; SN74BCT244N: 0°C to +70°C) and minor electrical parameters (e.g., ICCZ, tPZL). For industrial applications, the SN64BCT244N is the only qualified option-substituting SN74BCT244N may result in field failures outside its commercial temperature envelope.

What logic families can the SN64BCT244N interface with reliably?

The SN64BCT244N is designed for seamless interoperability with standard 5-V TTL and CMOS logic families. Its input thresholds (VIH = 2 V min, VIL = 0.8 V max) match TTL levels, while its output swing (VOH ≥ 2.4 V, VOL ≤ 0.55 V) meets both TTL and CMOS requirements. The P-N-P input structure minimizes DC loading on TTL sources, and the 64 mA sink capability drives up to 10 standard TTL loads. It is not intended for 3.3-V or mixed-voltage systems without level-shifting.

SN64BCT244N Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 64BCT

Package/Case:: 20-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

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:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 20-PDIP

SN64BCT244N FAQ

1.How can I place an order for SN64BCT244N through Aetrix?

Please submit a Request for Quotation (RFQ) for SN64BCT244N 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 SN64BCT244N reliable?

The price and inventory of SN64BCT244N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT244N is usually 5 days.

3.What payment methods are accepted for SN64BCT244N?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT244N transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN64BCT244N?

SN64BCT244N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN64BCT244N 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 SN64BCT244N?

For technical support, including SN64BCT244N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT244N requirements.

6.How does Aetrix verify that SN64BCT244N is sourced from the original manufacturer or authorized distributors?

All SN64BCT244N 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 SN64BCT244N meets industry standards.

7.What is the process for return or replacement of SN64BCT244N?

All SN64BCT244N units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT244N, 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 SN64BCT244N part is unused and in its original packaging.

Return procedure for SN64BCT244N:

1.Submit a request within 90 days.

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

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