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

Texas Instruments SN64BCT244DWR

Name: SN64BCT244DWR
Brand: Texas Instruments
SKU: SN64BCT244DWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: SN64BCT244DWR

Manufacturer:: Texas Instruments

Category:: Buffers, Drivers, Receivers, Transceivers

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

Datasheet:: SN64BCT244DWR.pdf

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

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Product details

Overview

SN64BCT244DWR from Texas Instruments is an octal noninverting buffer/line driver with dual 4-bit sections, 3-state outputs, BiCMOS technology, 5 V supply operation, and −40°C to 85°C temperature range - used for memory address buffering and bus driving in industrial control backplanes.

For engineers reviewing the SN64BCT244DWR datasheet, SN64BCT244DWR pinout, SN64BCT244DWR application, or SN64BCT244DWR equivalent, key selection criteria include output drive strength (64 mA sink), power-up high-impedance behavior, low ICCZ quiescent current (4–10 mA), and SOIC-20 package compatibility with legacy 5 V TTL/CMOS systems.

Technical Context

The SN64BCT244DWR 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 P-N-P input structure) with CMOS-compatible output stages.

It features power-rail insensitive 3-state control: outputs enter high-impedance below ~3 V VCC during power-up/down, preventing bus contention. Input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2.0 V), and outputs drive standard 50 pF loads with propagation delays under 6 ns at 5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	4.5 V to 5.5 V - operates reliably across full 5 V TTL/CMOS rail tolerance without regulation.
Output Drive (IOL)	64 mA sink per output - sufficient to drive multiple TTL loads or terminated transmission lines.
Propagation Delay	1.2–5.3 ns (tPLH/tPHL) - enables high-speed address/data buffering in sub-10 ns timing-critical paths.
Quiescent ICCZ	4–10 mA - significantly lower than bipolar-only equivalents, reducing standby power in always-on systems.
Input Thresholds	VIL = 0.8 V, VIH = 2.0 V - fully compatible with standard TTL logic families without level shifting.
Operating Temperature	−40°C to +85°C - qualified for industrial environments including factory automation and telecom infrastructure.

Pinout & Package

SN64BCT244DWR is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and JEDEC MS-013 registration.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output-enable controls for first and second 4-bit sections - asserted low enables A→Y pass-through.
2, 4, 6, 8	1A1–1A4	Noninverting inputs for section 1 - connect to upstream address/data lines requiring buffered fanout.
18, 16, 14, 12	1Y1–1Y4	Corresponding noninverting 3-state outputs for section 1 - drive bus segments or memory address registers.
11, 13, 15, 17	2A1–2A4	Noninverting inputs for section 2 - isolated from section 1 for dual-bus or split-address applications.
9, 7, 5, 3	2Y1–2Y4	Corresponding 3-state outputs for section 2 - independently controllable for time-multiplexed or redundant routing.
10, 20	GND, VCC	Power terminals - decoupling required within 1 cm of pins to maintain switching noise immunity.

Key Features

Feature	Design Value
BiCMOS architecture	Combines TTL-compatible input impedance with CMOS-level quiescent current (ICCZ ≤ 10 mA).
Power-rail insensitive 3-state	Outputs enter high-Z automatically when VCC drops below ~3 V - prevents bus contention during brownout or hot-swap.
P-N-P input stage	Reduces DC input loading to ≤1 mA (IIL = −1 mA), minimizing loading on preceding drivers or microcontroller GPIOs.
Matched tPLH/tPHL	Typical 2.5/3.2 ns asymmetry - ensures minimal duty-cycle distortion in clock distribution applications.
SOIC-20 footprint	Industry-standard 1.27 mm pitch layout - supports drop-in replacement in existing 5 V backplane designs.

Applications

Memory Address Buffering	Bus Transceiver Interface
Use Scenario: Driving 16-bit address bus from microcontroller to multiple SRAM/ROM chips in an industrial PLC backplane. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address lines from capacitive bus load while enabling chip-select arbitration. Use Value: 64 mA drive capability sustains signal integrity across 15 cm routed traces; power-up high-Z prevents spurious writes during reset.	Use Scenario: Bidirectional data bus isolation between FPGA and legacy peripheral ASIC in test equipment. IC Role / Device Role / Timing Role: Direction-controlled line driver enabling half-duplex communication without external direction logic. Use Value: Dual OE inputs allow precise timing control of bus turn-around; <6 ns propagation supports 100+ MHz burst transfers.
Clock Distribution Fanout	Industrial I/O Expansion
Use Scenario: Distributing system clock to eight synchronous peripherals (ADCs, DACs, timers) in motor control cabinet. IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched rise/fall characteristics for deterministic edge alignment. Use Value: 2.5 ns tPLH / 3.2 ns tPHL asymmetry minimizes jitter accumulation; BiCMOS reduces ground bounce vs. pure bipolar.	Use Scenario: Expanding GPIO count of ARM Cortex-M4 MCU to drive 8-channel relay module in building automation panel. IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between 3.3 V MCU outputs and 5 V relay coil drivers. Use Value: TTL-compatible inputs accept 3.3 V logic highs directly; 64 mA per output drives ULN2003 inputs without additional transistors.

Memory Address Buffering

Bus Transceiver Interface

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

IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address lines from capacitive bus load while enabling chip-select arbitration.

Use Value: 64 mA drive capability sustains signal integrity across 15 cm routed traces; power-up high-Z prevents spurious writes during reset.

Use Scenario: Bidirectional data bus isolation between FPGA and legacy peripheral ASIC in test equipment.

IC Role / Device Role / Timing Role: Direction-controlled line driver enabling half-duplex communication without external direction logic.

Use Value: Dual OE inputs allow precise timing control of bus turn-around; <6 ns propagation supports 100+ MHz burst transfers.

Clock Distribution Fanout

Industrial I/O Expansion

Use Scenario: Distributing system clock to eight synchronous peripherals (ADCs, DACs, timers) in motor control cabinet.

IC Role / Device Role / Timing Role: Low-skew noninverting buffer with matched rise/fall characteristics for deterministic edge alignment.

Use Value: 2.5 ns tPLH / 3.2 ns tPHL asymmetry minimizes jitter accumulation; BiCMOS reduces ground bounce vs. pure bipolar.

Use Scenario: Expanding GPIO count of ARM Cortex-M4 MCU to drive 8-channel relay module in building automation panel.

IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface between 3.3 V MCU outputs and 5 V relay coil drivers.

Use Value: TTL-compatible inputs accept 3.3 V logic highs directly; 64 mA per output drives ULN2003 inputs without additional transistors.

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 function but in 20-pin PDIP (N) package; higher thermal resistance and larger footprint.	Suitable only for through-hole prototyping or legacy board rework - not for surface-mount production.	Select SN74BCT244N only if DIP socketing or manual assembly is required; otherwise prefer SN64BCT244DWR for automated SMT.
SN74ACT244NSR	Advanced CMOS (ACT) variant: 3.3 V–5.5 V supply, lower ICC (2 µA), but only 24 mA IOL and no power-rail insensitive 3-state.	Requires external power sequencing or reset hold-off to avoid bus contention during power transitions.	Choose SN74ACT244NSR only for mixed-voltage systems needing 3.3 V compatibility; SN64BCT244DWR remains preferred for robust 5 V industrial use.

Compared with SN74BCT244N and SN74ACT244NSR, SN64BCT244DWR uniquely delivers 64 mA drive, automatic power-rail insensitive 3-state, and SOIC-20 packaging - making it the optimal choice for high-reliability 5 V bus buffering where bus contention avoidance and legacy footprint compatibility are critical.

Availability

SN64BCT244DWR is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and 5 V bus interface applications requiring stable component supply and long-term lifecycle support.

Supply support for SN64BCT244DWR 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 SN64BCT244DWR belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered for high-speed 5 V TTL-compatible interfacing with reduced power consumption and enhanced bus contention immunity.

FAQ

What is the maximum output sink current rating for SN64BCT244DWR?

The SN64BCT244DWR is rated for 64 mA per output in the low state (IOL) under recommended operating conditions (VCC = 4.5 V, TA = −40°C to 85°C). This allows direct driving of multiple TTL inputs or moderate-current loads like LED indicators or small relays without external amplification. Exceeding this limit risks parametric shift or reliability degradation over time.

Does SN64BCT244DWR support hot-swap or live-insertion into a powered bus?

Yes - the SN64BCT244DWR enters high-impedance state when VCC falls below approximately 3 V, which occurs during partial power application or removal. This feature prevents bus contention and back-driving during hot-swap events, making it suitable for modular backplane systems where cards may be inserted or removed while main power remains active.

Can SN64BCT244DWR operate with a 3.3 V supply voltage?

No - the SN64BCT244DWR is specified only for 4.5 V to 5.5 V operation. At 3.3 V, internal BiCMOS circuitry fails to bias correctly, resulting in undefined output states, excessive ICCZ, and potential latch-up. For 3.3 V systems, consider TI's ACT or LVC families instead; SN64BCT244DWR must be used strictly within its 5 V domain.

What is the purpose of the P-N-P input structure in SN64BCT244DWR?

The P-N-P input stage in SN64BCT244DWR reduces DC input loading to just −1 mA (IIL) at 0.5 V input, compared to typical TTL inputs drawing several mA. This lowers loading on upstream drivers - especially beneficial when buffering outputs from microcontrollers or low-drive logic gates - and improves noise margin by minimizing voltage droop on shared input nets.

Is SN64BCT244DWR pin-compatible with SN74LS244?

No - although both are octal noninverting buffers, SN64BCT244DWR has different pin assignments: OE inputs are on pins 1 and 19, while SN74LS244 places them on pins 1 and 19 *only in the N package*, but functional equivalence does not imply pin-for-pin compatibility across all packages. The DW SOIC layout differs from LS244's DIP or SOIC variants; PCB redesign is required for substitution.

SN64BCT244DWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: 64BCT

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

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: 20-SOIC

SN64BCT244DWR FAQ

1.How can I place an order for SN64BCT244DWR through Aetrix?

Please submit a Request for Quotation (RFQ) for SN64BCT244DWR 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 SN64BCT244DWR reliable?

The price and inventory of SN64BCT244DWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT244DWR is usually 5 days.

3.What payment methods are accepted for SN64BCT244DWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT244DWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for SN64BCT244DWR?

SN64BCT244DWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your SN64BCT244DWR 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 SN64BCT244DWR?

For technical support, including SN64BCT244DWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT244DWR requirements.

6.How does Aetrix verify that SN64BCT244DWR is sourced from the original manufacturer or authorized distributors?

All SN64BCT244DWR 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 SN64BCT244DWR meets industry standards.

7.What is the process for return or replacement of SN64BCT244DWR?

All SN64BCT244DWR units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT244DWR, 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 SN64BCT244DWR part is unused and in its original packaging.

Return procedure for SN64BCT244DWR:

1.Submit a request within 90 days.

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

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