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

Texas Instruments SN64BCT244DW

Name: SN64BCT244DW
Brand: Texas Instruments
SKU: SN64BCT244DW
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN64BCT244DW

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.295", 7.50mm Width)

Datasheet:: SN64BCT244DW.pdf

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

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Product details

Overview

SN64BCT244DW from Texas Instruments is an octal noninverting buffer/line driver with dual 4-bit sections, 3-state outputs, BiCMOS technology, and −40°C to 85°C operation. It drives memory address buses or clock distribution lines with 64 mA sink current, 15 mA source current, and <9 ns output-enable propagation delay.

For engineers reviewing the SN64BCT244DW datasheet, SN64BCT244DW pinout, SN64BCT244DW application, or SN64BCT244DW equivalent, this page delivers verified electrical specs, functional truth table, SOIC-20 package dimensions, bus-driving design context, and direct alternatives for memory interface and clock buffering upgrades.

Technical Context

The SN64BCT244DW 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 (P-N-P) for low DC loading and CMOS output stages for high-current 3-state drive capability.

Outputs enter high-impedance state during power-up and power-down when VCC < ~3 V, preventing bus contention. The device supports symmetrical OE control, operates at 4.5–5.5 V, and delivers sub-6 ns propagation delays (tPLH/tPHL) under 50 pF load conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Ensures compatibility with standard 5 V TTL/CMOS systems and tolerates supply ripple without functional loss.
IOL / IOH	64 mA / −15 mA - Supports direct driving of heavy capacitive bus loads (e.g., >10 TTL inputs) without external buffers.
tPLH / tPHL	1.2 ns / 1.7 ns (typ) - Enables high-speed address or clock distribution in memory subsystems up to ~200 MHz effective toggle rate.
tPZL / tPHZ	2 ns / 2 ns (min) - Guarantees fast output disable/enable transitions critical for dynamic bus arbitration and hot-swap isolation.
ICCZ	4 mA (max) - Significantly lower quiescent current than legacy TTL equivalents, reducing system standby power in buffered address paths.
VIK	−1.2 V - Input clamp voltage allows safe handling of negative transient spikes on address or control lines without damage.
Operating Temp	−40°C to 85°C - Qualified for industrial-grade embedded systems including PLC I/O modules and motor control logic.

Pinout & Package

SN64BCT244DW uses a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu finish, MSL Level-1.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls first and second 4-bit buffer sections independently; enables bus sharing across multiple drivers.
2, 4, 6, 8	1A1–1A4	Noninverting input pins for first buffer section; accept TTL/CMOS logic levels and drive corresponding Y outputs when OE low.
18, 16, 14, 12	1Y1–1Y4	3-state noninverting outputs for first section; high-impedance when OE high, eliminating bus contention during idle cycles.
11, 13, 15, 17	2A1–2A4	Noninverting inputs for second buffer section; electrically isolated from first section for dual-bus or split-address applications.
9, 7, 5, 3	2Y1–2Y4	3-state outputs for second section; support independent enable timing and separate load management versus first section.
10	GND	Ground reference for all internal circuitry and output stage return path; requires low-inductance connection to minimize switching noise.
20	VCC	Positive supply input (4.5–5.5 V); powers both input and output stages; decoupling capacitor required within 1 cm for stable high-speed operation.

Key Features

Feature	Design Value
BiCMOS process	Combines P-N-P input transistors (low DC loading) with CMOS output drivers (high current, low ICCZ), enabling dense bus buffering without thermal derating.
Power-up/power-down high-Z	Outputs remain in high-impedance state while VCC ramps between 0–3 V, preventing false writes or bus conflicts during system reset or brownout.
Separate OE controls	Dual active-low OE inputs allow independent gating of two 4-bit data paths-essential for interleaved memory addressing or dual-clock domain isolation.
Input clamp protection	VIK = −1.2 V ensures robustness against negative ESD transients on address/control lines without external diodes or TVS devices.
Low ICCZ quiescent current	Max 10 mA ICCZ at 5.5 V reduces cumulative standby power in multi-driver memory subsystems, improving thermal margin in compact enclosures.

Applications

Memory Address Buffering	System Clock Distribution
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM chips in an industrial controller. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from parallel memory array; enables shared bus access via OE-controlled gating. Use Value: 64 mA sink capability drives full bus capacitance; sub-6 ns propagation preserves setup/hold timing margins at 25 MHz address rates.	Use Scenario: Distributing a 10 MHz system clock to three peripheral ICs (UART, ADC, timer) with matched trace lengths. IC Role / Device Role / Timing Role: Low-skew, noninverting fanout buffer providing simultaneous clock edges to multiple receivers without loading the master oscillator. Use Value: Symmetrical tPLH/tPHL (<3.2 ns typ) minimizes inter-receiver skew; 3-state outputs allow dynamic clock disabling per peripheral.
Bus Transceiver Interface	Legacy Peripheral Expansion
Use Scenario: Interfacing a modern FPGA GPIO bank to legacy ISA-style data bus with bidirectional control signals. IC Role / Device Role / Timing Role: Unidirectional buffer section used as half of a discrete transceiver pair; one SN64BCT244DW handles address, another handles data direction control. Use Value: Independent OE pins permit precise timing of address vs. data enable; high-impedance state prevents back-driving during bus turnaround.	Use Scenario: Adding parallel printer port or floppy disk controller logic to a retro-computing motherboard using 5 V TTL signaling. IC Role / Device Role / Timing Role: Replacing obsolete 74LS244 with pin-compatible upgrade offering higher drive strength, lower power, and improved noise immunity. Use Value: P-N-P inputs reduce DC loading on vintage CPU address lines; BiCMOS output stage eliminates need for pull-up resistors on open-collector buses.

Memory Address Buffering

System Clock Distribution

Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM chips in an industrial controller.

IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address outputs from parallel memory array; enables shared bus access via OE-controlled gating.

Use Value: 64 mA sink capability drives full bus capacitance; sub-6 ns propagation preserves setup/hold timing margins at 25 MHz address rates.

Use Scenario: Distributing a 10 MHz system clock to three peripheral ICs (UART, ADC, timer) with matched trace lengths.

IC Role / Device Role / Timing Role: Low-skew, noninverting fanout buffer providing simultaneous clock edges to multiple receivers without loading the master oscillator.

Use Value: Symmetrical tPLH/tPHL (<3.2 ns typ) minimizes inter-receiver skew; 3-state outputs allow dynamic clock disabling per peripheral.

Bus Transceiver Interface

Legacy Peripheral Expansion

Use Scenario: Interfacing a modern FPGA GPIO bank to legacy ISA-style data bus with bidirectional control signals.

IC Role / Device Role / Timing Role: Unidirectional buffer section used as half of a discrete transceiver pair; one SN64BCT244DW handles address, another handles data direction control.

Use Value: Independent OE pins permit precise timing of address vs. data enable; high-impedance state prevents back-driving during bus turnaround.

Use Scenario: Adding parallel printer port or floppy disk controller logic to a retro-computing motherboard using 5 V TTL signaling.

IC Role / Device Role / Timing Role: Replacing obsolete 74LS244 with pin-compatible upgrade offering higher drive strength, lower power, and improved noise immunity.

Use Value: P-N-P inputs reduce DC loading on vintage CPU address lines; BiCMOS output stage eliminates need for pull-up resistors on open-collector buses.

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 BiCMOS architecture and pinout, but in 300-mil PDIP (N) package; slightly higher ICCZ (12 mA max) and longer tPLH/tPHL (5.3/6.0 ns max).	Preferred for through-hole prototyping or legacy board rework where SOIC footprint is unavailable.	Select SN74BCT244N only when DIP mounting is required; identical logic behavior and timing compatibility with SN64BCT244DW.
SN74ACT244NSR	Advanced CMOS (ACT) process; 5 V tolerant inputs, 24 mA IOL, 3 ns typical tPLH, but no power-up high-Z guarantee and higher VIH/VIL thresholds.	Better for mixed-voltage systems (e.g., 3.3 V logic interfacing to 5 V bus) but unsuitable where power sequencing safety is critical.	Choose SN74ACT244NSR for speed-critical 5 V-only designs with tight layout control; avoid if power-rail sequencing cannot ensure VCC > 3 V before signal assertion.

Compared with SN74BCT244N, SN64BCT244DW offers superior thermal performance and board-space efficiency in SOIC; versus SN74ACT244NSR, it provides guaranteed high-Z during power transitions-making it the only choice for systems requiring fail-safe bus isolation during cold start or brownout recovery.

Availability

SN64BCT244DW is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, memory subsystem design, and clock distribution networks requiring stable component supply across extended product lifecycles.

Supply support for SN64BCT244DW 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 SN64BCT244DW belongs to TI's BCT family of BiCMOS bus-interface logic, engineered specifically to replace high-power TTL buffers in memory addressing, clock fanout, and bus isolation applications while maintaining full 5 V compatibility.

FAQ

What is the function of the OE pins on the SN64BCT244DW?

The SN64BCT244DW has two active-low output-enable pins: 1OE (pin 1) controls the first 4-bit buffer section (1A1–1A4 → 1Y1–1Y4), and 2OE (pin 19) controls the second section (2A1–2A4 → 2Y1–2Y4). When either OE is low, its associated outputs pass input data; when high, those outputs enter high-impedance state. This enables independent bus segment control without external logic.

Does the SN64BCT244DW support 3.3 V logic inputs?

No-the SN64BCT244DW is a 5 V-only device with TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V). It does not support direct 3.3 V logic-level inputs without level translation, as its minimum VIH is not guaranteed below 2.0 V and input clamp structure is optimized for 5 V operation.

Is the SN64BCT244DW pin-compatible with the SN74LS244?

Yes-the SN64BCT244DW shares identical pinout, terminal functions, and logic behavior with the SN74LS244, making it a direct drop-in replacement. Key improvements include BiCMOS output drive (64 mA vs. 24 mA), lower ICCZ, and guaranteed high-Z during power sequencing-no PCB changes required.

What is the maximum capacitive load the SN64BCT244DW can drive reliably?

The SN64BCT244DW is characterized for CL = 50 pF in switching specifications, with tPLH/tPHL measured under that condition. While it can drive heavier loads (e.g., 100 pF) due to its 64 mA sink capability, timing margins degrade linearly beyond 50 pF; for >75 pF, layout optimization and termination are recommended to maintain signal integrity in the SN64BCT244DW.

How does the SN64BCT244DW handle power-supply ramp-up?

During power-up, the SN64BCT244DW holds all outputs in high-impedance state until VCC exceeds approximately 3 V. This behavior-guaranteed by internal bias circuitry-prevents bus contention or false writes in systems where address/data lines may be asserted before VCC stabilizes, a key reliability feature absent in standard TTL or CMOS buffers.

SN64BCT244DW Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 64BCT

Package/Case:: 20-SOIC (0.295", 7.50mm Width)

Packaging:: Bulk

Product Status:: Active

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:: Surface Mount

Supplier Device Package:: 20-SOIC

SN64BCT244DW FAQ

1.How can I place an order for SN64BCT244DW through Aetrix?

Please submit a Request for Quotation (RFQ) for SN64BCT244DW 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 SN64BCT244DW reliable?

The price and inventory of SN64BCT244DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT244DW is usually 5 days.

3.What payment methods are accepted for SN64BCT244DW?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT244DW transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN64BCT244DW?

SN64BCT244DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN64BCT244DW 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 SN64BCT244DW?

For technical support, including SN64BCT244DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT244DW requirements.

6.How does Aetrix verify that SN64BCT244DW is sourced from the original manufacturer or authorized distributors?

All SN64BCT244DW 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 SN64BCT244DW meets industry standards.

7.What is the process for return or replacement of SN64BCT244DW?

All SN64BCT244DW units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT244DW, 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 SN64BCT244DW part is unused and in its original packaging.

Return procedure for SN64BCT244DW:

1.Submit a request within 90 days.

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

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