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Texas Instruments SN64BCT244NS

Name: SN64BCT244NS
Brand: Texas Instruments
SKU: SN64BCT244NS
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN64BCT244NS

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: -

Datasheet:: SN64BCT244NS.pdf

Description:: BUS TRANSCEIVER

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Product details

Overview

SN64BCT244NS from Texas Instruments is an octal noninverting buffer/line driver with dual 4-bit sections, 3-state outputs, BiCMOS architecture, −40°C to 85°C operating range, and 5 V nominal supply. It drives memory address buses and clock distribution lines in industrial control backplanes.

For engineers reviewing the SN64BCT244NS datasheet, SN64BCT244NS pinout, SN64BCT244NS application, or SN64BCT244NS equivalent, key selection criteria include output drive strength (64 mA sink), power-up high-impedance behavior, P-N-P input structure for low DC loading, and SO-20 (NS) package compatibility with legacy DIP layouts.

Technical Context

The SN64BCT244NS implements two independent 4-bit noninverting buffers, each controlled by a dedicated active-low output-enable (OE) input. Its BiCMOS design combines bipolar input stages for low input current and CMOS output stages for rail-to-rail swing and high noise immunity.

It features guaranteed high-impedance outputs during power sequencing (VCC < ~3 V), P-N-P input transistors reducing static current draw, and symmetrical OE/OE logic enabling flexible bus arbitration. Switching times are specified at 50 pF load with 500 Ω source impedance.

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 (sink)	64 mA - supports direct connection to multiple TTL loads or termination-resistor-driven buses without external buffering.
Propagation delay	1.2–5.3 ns (tPLH/tPHL) - enables use in high-speed address/data latching up to ~100 MHz system clocks.
Power-up state	High-impedance outputs below ~3 V VCC - prevents bus contention during cold-start or brownout conditions.
Input structure	P-N-P transistor inputs - limits IIH to 20 µA and IIL to −1 mA, reducing static loading on upstream drivers.
Operating temperature	−40°C to +85°C - qualified for industrial-grade embedded systems including programmable logic controllers and instrumentation.
ICCZ (quiescent current)	4–10 mA - significantly lower than bipolar-only equivalents, reducing standby power in always-on bus interfaces.

Pinout & Package

SN64BCT244NS uses a 20-pin Small-Outline (SO) package per drawing NS, 7.5 mm body width, 1.27 mm pitch, RoHS-compliant CU NIPDAU finish, MSL Level-1 rated.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls first and second 4-bit sections independently; asserts high-Z when high.
2, 4, 6, 8	1A1–1A4	Noninverting inputs for first buffer section; accept TTL/CMOS logic levels with P-N-P input structure.
18, 16, 14, 12	1Y1–1Y4	Noninverting buffered outputs for first section; drive bus lines with 64 mA sink capability.
11, 13, 15, 17	2A1–2A4	Noninverting inputs for second buffer section; electrically isolated from first section.
9, 7, 5, 3	2Y1–2Y4	Noninverting buffered outputs for second section; support independent bus segment control.
10	GND	Ground reference for all internal circuitry and output stage return path.
20	VCC	+5 V supply input; powers both input and output stages; requires local 0.1 µF decoupling.

Key Features

Feature	Design Value
BiCMOS process technology	Combines low-input-current P-N-P inputs with fast, low-impedance CMOS outputs - reduces ICCZ by >50% vs. pure bipolar BCT devices.
Power-up/power-down high-Z	Outputs remain in high-impedance state while VCC ramps between 0 V and ~3 V - eliminates bus glitches during hot-swap or reset sequences.
Separate OE controls	Dual active-low OE pins allow independent gating of two 4-bit data paths - enables interleaved memory addressing or dual-bus arbitration.
TTL-compatible inputs	VIH = 2 V min, VIL = 0.8 V max - interoperates directly with legacy 5 V TTL, LVTTL, and mixed-voltage logic families without level shifters.
High noise immunity	VOL = 0.55 V max at 64 mA sink, VOH = 2.4 V min at −15 mA source - provides >0.4 V noise margin under full load.

Applications

Memory Address Buffering	Industrial Backplane Interface
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or EPROM chips on a shared bus. IC Role / Device Role / Timing Role: Noninverting octal buffer providing fanout and isolation between CPU and memory array; dual OE allows bank-select timing control. Use Value: 64 mA output drive ensures signal integrity across 10+ cm PCB traces; high-Z during reset prevents memory corruption on power cycle.	Use Scenario: Interfacing PLC CPU modules with I/O expansion racks via parallel backplane connectors. IC Role / Device Role / Timing Role: Bus driver isolating CPU address/data/control signals from noisy rack-level wiring; separate OE supports modular slot enable. Use Value: P-N-P inputs minimize loading on CPU outputs; −40°C to 85°C rating sustains operation in unconditioned control cabinets.
Legacy System Clock Distribution	Test Equipment Signal Conditioning
Use Scenario: Distributing a 25 MHz system clock to multiple FPGA configuration ICs and peripheral controllers. IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched tPLH/tPHL ensuring synchronous edge delivery across all eight outputs. Use Value: 1.2 ns typical propagation delay and 5.3 ns max skew preserve setup/hold margins; SO-20 package fits dense test board layouts.	Use Scenario: Conditioning digital stimulus signals from ATE pattern generators before applying to DUT inputs. IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer for 5 V logic signals driving capacitive or resistive DUT loads. Use Value: 64 mA sink capability drives 50 Ω terminated lines; high-Z disable allows safe signal routing reconfiguration mid-test.

Memory Address Buffering

Industrial Backplane Interface

Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or EPROM chips on a shared bus.

IC Role / Device Role / Timing Role: Noninverting octal buffer providing fanout and isolation between CPU and memory array; dual OE allows bank-select timing control.

Use Value: 64 mA output drive ensures signal integrity across 10+ cm PCB traces; high-Z during reset prevents memory corruption on power cycle.

Use Scenario: Interfacing PLC CPU modules with I/O expansion racks via parallel backplane connectors.

IC Role / Device Role / Timing Role: Bus driver isolating CPU address/data/control signals from noisy rack-level wiring; separate OE supports modular slot enable.

Use Value: P-N-P inputs minimize loading on CPU outputs; −40°C to 85°C rating sustains operation in unconditioned control cabinets.

Legacy System Clock Distribution

Test Equipment Signal Conditioning

Use Scenario: Distributing a 25 MHz system clock to multiple FPGA configuration ICs and peripheral controllers.

IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched tPLH/tPHL ensuring synchronous edge delivery across all eight outputs.

Use Value: 1.2 ns typical propagation delay and 5.3 ns max skew preserve setup/hold margins; SO-20 package fits dense test board layouts.

Use Scenario: Conditioning digital stimulus signals from ATE pattern generators before applying to DUT inputs.

IC Role / Device Role / Timing Role: Level-shifting and drive-strengthening buffer for 5 V logic signals driving capacitive or resistive DUT loads.

Use Value: 64 mA sink capability drives 50 Ω terminated lines; high-Z disable allows safe signal routing reconfiguration mid-test.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
SN74BCT244N	Same BiCMOS architecture, identical pinout, but PDIP-20 (N) package only; no SO option.	Lacks SO-20 footprint; suitable only where through-hole assembly or socketing is required.	Choose SN74BCT244N for prototyping or legacy DIP-based systems; SN64BCT244NS preferred for surface-mount production.
SN64BCT244DW	Identical electrical specs and function, but SOIC-20 (DW) package: 7.5 mm width, 1.27 mm pitch, same pinout as NS.	DW has tighter dimensional tolerance and different tape/reel packaging (25 pcs vs. 2000 pcs); identical thermal performance.	SN64BCT244DW is drop-in compatible for board space-constrained designs requiring SOIC footprint; NS offers higher reel quantity for high-volume SMT.

Compared with SN74BCT244N and SN64BCT244DW, the SN64BCT244NS delivers identical BiCMOS performance in a 2000-piece SO-20 tape-and-reel format optimized for automated SMT placement, while maintaining full functional and pinout compatibility with both alternatives.

Availability

SN64BCT244NS is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and legacy clock distribution networks requiring stable component supply and long-term obsolescence management.

Supply support for SN64BCT244NS 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 SN64BCT244NS belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, designed specifically for high-drive, low-noise bus interfacing in industrial and computing systems requiring robust 5 V operation.

FAQ

What is the maximum output sink current specification for SN64BCT244NS?

The SN64BCT244NS is rated for 64 mA maximum low-level output current (IOL) per output pin under recommended operating conditions (VCC = 4.5 V, TA = −40°C to 85°C). This value is guaranteed across temperature and voltage ranges and supports direct driving of multiple TTL loads or 50 Ω terminated lines without external amplification. The SN64BCT244NS maintains this drive strength while delivering low propagation delay and high noise immunity.

Does SN64BCT244NS support hot-plug or live-insertion scenarios?

Yes, the SN64BCT244NS enters a guaranteed high-impedance state when VCC drops below approximately 3 V, protecting downstream bus lines during partial power-up or hot-swap events. This feature is explicitly characterized in the datasheet and applies to both power-up and power-down transitions. The SN64BCT244NS leverages this behavior to prevent bus contention in modular industrial systems where cards may be inserted or removed while main power remains active.

Is SN64BCT244NS pin-compatible with SN74BCT244N?

Yes, the SN64BCT244NS and SN74BCT244N share identical pin functions and logic behavior, differing only in package type: NS is SO-20, N is PDIP-20. Both use the same 20-pin numbering scheme and terminal assignments (e.g., Pin 1 = 1OE, Pin 2 = 1A1, etc.). The SN64BCT244NS can replace SN74BCT244N in surface-mount designs, while SN74BCT244N serves through-hole applications - the SN64BCT244NS retains full functional equivalence.

What is the input structure of SN64BCT244NS and why does it matter?

The SN64BCT244NS uses P-N-P transistor inputs, resulting in very low input current: IIH ≤ 20 µA at VI = 2.7 V and IIL ≥ −1 mA at VI = 0.5 V. This minimizes DC loading on upstream drivers, extends fanout capability, and improves noise immunity in electrically noisy industrial environments. The P-N-P input structure is a defining characteristic of the BCT family and is integral to the SN64BCT244NS's low-power, high-density bus interface performance.

Can SN64BCT244NS operate reliably at 4.5 V supply voltage?

Yes, the SN64BCT244NS is fully characterized and guaranteed to meet all specifications at VCC = 4.5 V minimum, including propagation delay (tPLH/tPHL ≤ 5.3 ns), output voltage levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V), and drive strength (IOL = 64 mA). This 4.5–5.5 V operating range ensures robust operation in systems with rail tolerances or aging power supplies, making the SN64BCT244NS suitable for long-lifecycle industrial deployments where voltage margin is critical.

SN64BCT244NS 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:: -

SN64BCT244NS FAQ

1.How can I place an order for SN64BCT244NS through Aetrix?

Please submit a Request for Quotation (RFQ) for SN64BCT244NS 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 SN64BCT244NS reliable?

The price and inventory of SN64BCT244NS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT244NS is usually 5 days.

3.What payment methods are accepted for SN64BCT244NS?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT244NS transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN64BCT244NS?

SN64BCT244NS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN64BCT244NS 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 SN64BCT244NS?

For technical support, including SN64BCT244NS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT244NS requirements.

6.How does Aetrix verify that SN64BCT244NS is sourced from the original manufacturer or authorized distributors?

All SN64BCT244NS 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 SN64BCT244NS meets industry standards.

7.What is the process for return or replacement of SN64BCT244NS?

All SN64BCT244NS units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT244NS, 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 SN64BCT244NS part is unused and in its original packaging.

Return procedure for SN64BCT244NS:

1.Submit a request within 90 days.

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

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