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

Texas Instruments SN64BCT244NSR

Name: SN64BCT244NSR
Brand: Texas Instruments
SKU: SN64BCT244NSR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN64BCT244NSR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: SN64BCT244NSR.pdf

Description:: IC BUFFER NON-INVERT 5.5V 20SO

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Product details

Overview

SN64BCT244NSR from Texas Instruments is an octal noninverting buffer/line driver with dual 4-bit sections, 3-state outputs, BiCMOS architecture, and operation from −40°C to 85°C. It drives memory address buses or clock distribution lines with 64 mA sink current, low ICCZ (4–10 mA), and high-impedance state during power-up/down.

For engineers reviewing the SN64BCT244NSR datasheet, SN64BCT244NSR pinout, SN64BCT244NSR application, or SN64BCT244NSR equivalent, key selection criteria include bus-driving capability under 5 V supply, output-enable timing (tPZH/tPZL ≤ 9 ns), thermal stability across industrial temperature range, and SOIC-20 package compatibility with legacy DIP footprint layouts.

Technical Context

The SN64BCT244NSR 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 DC loading and CMOS output stages for high drive strength and reduced ICCZ.

It features P-N-P input structure to minimize input current (IIL = −1 mA max), rail-to-rail output voltage swing (VOH ≥ 2.0 V at IOL = 64 mA), and guaranteed high-impedance behavior below ~3 V supply-critical for hot-swap and power sequencing in bus systems.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	4.5 V to 5.5 V - Operates reliably within standard TTL-compatible 5 V supply tolerance bands.
IOL / IOH	64 mA sink / −15 mA source - Drives heavy capacitive bus loads without external buffering.
tPLH / tPHL	1.2–5.3 ns - Enables high-speed address or clock distribution in sub-10 ns timing-critical paths.
ICCZ	4–10 mA - Significantly lower quiescent current than equivalent bipolar-only drivers, reducing system power overhead.
Operating Temp	−40°C to 85°C - Qualified for industrial environments without derating or thermal management.
IOZ (Power-Up)	≤50 µA - Ensures safe high-Z state during brown-out or ramp-up, preventing bus contention.

Pinout & Package

SN64BCT244NSR uses a 20-pin SOIC (Small-Outline Integrated Circuit) package per JEDEC MS-013, with 1.27 mm pitch, 7.6 mm body width, and 2.65 mm max height. Pin 1 marked via beveled corner or notch.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls first and second 4-bit sections independently.
2, 4, 6, 8	1A1–1A4	Noninverting inputs for section 1 - connect to upstream address or control lines.
18, 16, 14, 12	1Y1–1Y4	Noninverting outputs for section 1 - drive downstream bus segments or memory inputs.
11, 13, 15, 17	2A1–2A4	Noninverting inputs for section 2 - support parallel or mirrored signal routing.
9, 7, 5, 3	2Y1–2Y4	Noninverting outputs for section 2 - enable dual-bus or redundant path configurations.
10, 20	GND, VCC	Ground and 5 V supply pins - decoupling required within 10 mm of these pins for noise immunity.

Key Features

Feature	Design Value
BiCMOS architecture	Combines low-input-current P-N-P inputs with high-drive CMOS outputs, enabling 64 mA sink while holding ICCZ ≤ 10 mA.
Power-up/power-down high-Z	Outputs enter high-impedance state automatically when VCC < ~3 V - eliminates need for external reset sequencing logic.
Separate OE controls	Two independent active-low enables allow dynamic partitioning of bus traffic between two 4-bit domains without gating logic.
300-mil SOIC footprint	NS package matches legacy N-package DIP-20 pinout spacing, enabling drop-in replacement on existing PCBs with SOIC adapters.

Applications

Memory Address Buffering	Clock Distribution
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM or EPROM devices in a shared-memory system. IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address lines from capacitive load of parallel memory chips. Use Value: Delivers 64 mA sink current per output to meet setup/hold timing under 100 pF total bus capacitance, with tPHL ≤ 6 ns ensuring cycle-time compliance.	Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., UART, timer, ADC) with matched skew. IC Role / Device Role / Timing Role: Low-skew fanout buffer replicating clock signal with minimal propagation delay variation across outputs. Use Value: Matches tPLH/tPHL specs (≤5.3 ns) and ensures simultaneous edge delivery across all eight outputs, reducing clock domain jitter.
Bus Transceiver Interface	Legacy System Expansion
Use Scenario: Isolating ISA or similar parallel bus segments during DMA transfers to prevent data corruption. IC Role / Device Role / Timing Role: 3-state bidirectional buffer enabling controlled bus arbitration via OE signals. Use Value: Fast enable/disable timing (tPZH/tPLZ ≤ 9.8 ns) allows precise windowing of bus access, minimizing arbitration latency.	Use Scenario: Upgrading vintage industrial controller PCBs originally using SN74LS244N with surface-mount assembly. IC Role / Device Role / Timing Role: Pin-compatible SOIC replacement for through-hole octal buffers in space-constrained retrofits. Use Value: NS package maintains 300-mil DIP-20 pin spacing, allowing reuse of existing footprints and stencil designs with no layout revision.

Memory Address Buffering

Clock Distribution

Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM or EPROM devices in a shared-memory system.

IC Role / Device Role / Timing Role: Noninverting buffer isolating CPU address lines from capacitive load of parallel memory chips.

Use Value: Delivers 64 mA sink current per output to meet setup/hold timing under 100 pF total bus capacitance, with tPHL ≤ 6 ns ensuring cycle-time compliance.

Use Scenario: Distributing a single system clock to multiple synchronous peripherals (e.g., UART, timer, ADC) with matched skew.

IC Role / Device Role / Timing Role: Low-skew fanout buffer replicating clock signal with minimal propagation delay variation across outputs.

Use Value: Matches tPLH/tPHL specs (≤5.3 ns) and ensures simultaneous edge delivery across all eight outputs, reducing clock domain jitter.

Bus Transceiver Interface

Legacy System Expansion

Use Scenario: Isolating ISA or similar parallel bus segments during DMA transfers to prevent data corruption.

IC Role / Device Role / Timing Role: 3-state bidirectional buffer enabling controlled bus arbitration via OE signals.

Use Value: Fast enable/disable timing (tPZH/tPLZ ≤ 9.8 ns) allows precise windowing of bus access, minimizing arbitration latency.

Use Scenario: Upgrading vintage industrial controller PCBs originally using SN74LS244N with surface-mount assembly.

IC Role / Device Role / Timing Role: Pin-compatible SOIC replacement for through-hole octal buffers in space-constrained retrofits.

Use Value: NS package maintains 300-mil DIP-20 pin spacing, allowing reuse of existing footprints and stencil designs with no layout revision.

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 and function, but in 20-pin PDIP package; higher ICCZ (12–15 mA) and slower tPHL (7 ns typ).	Through-hole mounting only; unsuitable for automated SMT production or high-density boards.	Select when hand-soldering or legacy through-hole assembly is required; avoid for new SMT designs.
SN74ACT244NSR	TTL-compatible CMOS (ACT) family; 5 V only (no 4.5–5.5 V range); lower drive (24 mA), faster speed (tPLH = 2.5 ns), no power-up high-Z guarantee.	Lacks automatic high-Z during power ramp; requires external OE control sequencing for hot-swap safety.	Choose for speed-critical, fully powered systems where power sequencing is tightly controlled; not for unmanaged power domains.

Compared with SN74BCT244N and SN74ACT244NSR, the SN64BCT244NSR uniquely balances industrial temperature range, guaranteed power-ramp high-Z behavior, and robust 64 mA drive in an SMT-optimized SOIC package-making it optimal for bus isolation in embedded controllers with variable power profiles.

Availability

SN64BCT244NSR is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, bus transceiver interface, and legacy system expansion requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for SN64BCT244NSR 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 SN64BCT244NSR belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered for high-speed, low-power bus interfacing in industrial control and computing systems where reliability under voltage transients and thermal stress is critical.

FAQ

What is the maximum output sink current specification for SN64BCT244NSR?

The SN64BCT244NSR supports up to 64 mA per output in the low state (IOL), tested at VCC = 4.5 V and specified over the full −40°C to 85°C operating range. This rating ensures reliable driving of terminated transmission lines or multiple TTL inputs without external current boosting, and is validated per TI's SCBS027A datasheet Section 3.

Does SN64BCT244NSR have built-in power-up protection?

Yes, the SN64BCT244NSR enters a guaranteed high-impedance state whenever VCC falls below approximately 3 V-covering both power-up and power-down transitions. This behavior prevents bus contention and back-driving during supply ramping, eliminating the need for external reset-controlled OE circuitry in the SN64BCT244NSR design.

Is SN64BCT244NSR pin-compatible with older DIP versions?

The SN64BCT244NSR uses the NS SOIC-20 package with 300-mil pin spacing matching the legacy SN64BCT244N DIP-20 footprint. While not electrically identical to all DIP variants, its pin mapping (including OE, A, Y, GND, VCC positions) is identical-enabling direct PCB footprint reuse with SOIC-to-DIP adapter carriers or reflow-compatible land patterns.

What is the recommended operating voltage range for SN64BCT244NSR?

The SN64BCT244NSR is characterized for reliable operation from 4.5 V to 5.5 V, with typical performance metrics (e.g., VOH, VOL, tPLH) specified at VCC = 5 V. Operation outside this range-especially below 4.5 V-may degrade output drive strength and timing margins, and is not supported per the recommended operating conditions table in the SN64BCT244NSR datasheet.

How does SN64BCT244NSR differ from standard 74LS244 devices?

The SN64BCT244NSR uses BiCMOS technology versus the bipolar-only construction of 74LS244, delivering 64 mA output sink (vs. 8 mA for LS), lower ICCZ (4–10 mA vs. ~25 mA), and guaranteed high-Z during power transitions. These improvements make the SN64BCT244NSR suitable for modern high-density, low-power bus systems where the 74LS244 would require additional buffering or thermal mitigation.

SN64BCT244NSR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 64BCT

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

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-SO

SN64BCT244NSR FAQ

1.How can I place an order for SN64BCT244NSR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN64BCT244NSR 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 SN64BCT244NSR reliable?

The price and inventory of SN64BCT244NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT244NSR is usually 5 days.

3.What payment methods are accepted for SN64BCT244NSR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT244NSR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN64BCT244NSR?

SN64BCT244NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN64BCT244NSR 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 SN64BCT244NSR?

For technical support, including SN64BCT244NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT244NSR requirements.

6.How does Aetrix verify that SN64BCT244NSR is sourced from the original manufacturer or authorized distributors?

All SN64BCT244NSR 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 SN64BCT244NSR meets industry standards.

7.What is the process for return or replacement of SN64BCT244NSR?

All SN64BCT244NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT244NSR, 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 SN64BCT244NSR part is unused and in its original packaging.

Return procedure for SN64BCT244NSR:

1.Submit a request within 90 days.

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

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