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Texas Instruments SN64BCT240DW
- Part No.:
- SN64BCT240DW
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN64BCT240DW.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
- Quantity:
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Inventory:3,975
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Product details
Overview
SN64BCT240DW from Texas Instruments is an octal noninverting 3-state buffer/line driver with two independent 4-bit sections, each featuring separate active-low output-enable (OE) inputs. It operates at 4.5–5.5 V, delivers 64 mA sink current per output, supports −40°C to 85°C industrial temperature range, and is used in memory address buffering and bus driving applications.
For engineers reviewing the SN64BCT240DW datasheet, SN64BCT240DW pinout, SN64BCT240DW application, or SN64BCT240DW equivalent, key selection criteria include output drive strength (64 mA), propagation delay (≤6.4 ns), high-impedance state behavior during power sequencing, and SOIC-20 package compatibility with legacy 5-V TTL/CMOS bus systems.
Technical Context
The SN64BCT240DW implements a BiCMOS architecture that reduces ICCZ quiescent supply current to 6–9 mA while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V) and CMOS-level output swing. Its dual 4-bit structure enables independent control of two bus segments via 1OE and 2OE pins.
Each buffer section passes data from A inputs to Y outputs when its OE is low; outputs enter high-impedance state when OE is high. The device features built-in high-impedance protection during power-up/down and ESD tolerance >2000 V per MIL-STD-883C Method 3015.
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 logic rails and stable operation across industrial voltage tolerances. |
| Output Sink Current | 64 mA per output - enables direct drive of multiple TTL loads or termination-resistor-loaded buses without external buffers. |
| Propagation Delay | ≤6.4 ns (tPHL/tPLH) - supports high-speed address/data bus timing in memory subsystems up to ~150 MHz effective toggle rate. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees reliable recognition of standard TTL logic levels across temperature and process variation. |
| Power-Up Behavior | Outputs remain high-impedance until VCC stabilizes - prevents bus contention during system power sequencing. |
| ESD Rating | >2000 V HBM - meets MIL-STD-883C requirements for robustness in manufacturing and field handling environments. |
Pinout & Package
SN64BCT240DW is housed in a 20-pin SOIC (DW) package, 7.5 mm wide, 12.8 mm long, with 1.27 mm pitch and maximum height of 2.65 mm. Pin 1 is marked by a beveled corner or notch on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enable for each 4-bit section; drives outputs to high-Z when high, enabling bidirectional bus arbitration. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Noninverting inputs for respective buffer sections; accept standard TTL/CMOS logic levels. |
| 1Y1–1Y4, 2Y1–2Y4 | Buffered outputs | 3-state outputs capable of sinking 64 mA; electrically isolated from inputs when OE is asserted high. |
| VCC (Pin 20) | Positive supply | 5-V nominal supply connection; decoupling capacitor required near pin for noise suppression. |
| GND (Pin 10) | Ground reference | Common return path for all internal circuitry and I/O; must be low-impedance to minimize ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS process technology | Reduces ICCZ quiescent current to 6–9 mA while retaining TTL-compatible speed and drive strength. |
| Independent dual 4-bit sections | Enables simultaneous control of two separate 4-bit buses (e.g., upper/lower address bytes) using dedicated OE pins. |
| High-impedance during power transition | Prevents undefined output states and bus conflicts during power-up/down sequences without external reset coordination. |
| TTL-compatible input thresholds | Accepts legacy TTL logic levels (0.8 V/2.0 V) while interfacing cleanly with modern CMOS systems. |
Applications
| Memory Address Buffering | Bus Transceiver Interface |
|---|---|
Use Scenario: Driving multiplexed address lines between microprocessor and SRAM/ROM chips in embedded controllers. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from memory array; enabled only during read/write cycles. Use Value: 64 mA output drive supports fan-out to eight TTL loads; ≤6.4 ns delay maintains setup/hold timing margins at 12-MHz bus clock rates. | Use Scenario: Isolating bidirectional data bus segments between processor and peripheral ICs in industrial PLC backplanes. IC Role / Device Role / Timing Role: Direction-controlled line driver enabling controlled data flow between master and slave devices on shared parallel bus. Use Value: Dual OE inputs allow precise timing of bus release and acquisition; high-Z state prevents contention during arbitration. |
| Clock Distribution Network | Legacy System Bus Expansion |
Use Scenario: Distributing buffered clock signals to multiple synchronous peripherals in test equipment or instrumentation. IC Role / Device Role / Timing Role: Low-skew, noninverting clock driver with 3-state capability for dynamic clock gating. Use Value: Propagation delay matching (tPLH ≈ tPHL) minimizes duty-cycle distortion; BiCMOS design lowers jitter contribution from supply noise. | Use Scenario: Adding additional address or control lines to vintage 8-bit computer expansion slots or retro-computing hardware. IC Role / Device Role / Timing Role: Pin-compatible upgrade for obsolete 74LS240-style drivers in legacy 5-V systems requiring higher drive and lower power. Use Value: SOIC-20 footprint matches DIP-20 layouts via adapter; 64 mA drive exceeds LS-TTL (24 mA), supporting modern load conditions. |
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 |
|---|---|---|---|
| SN74BCT240N | DIP-20 package; identical electrical specs and pinout; same BiCMOS process and timing. | Through-hole mounting only; no surface-mount option; higher board space requirement. | Select when legacy through-hole assembly or socket-based prototyping is required. |
| SN74ACT240DW | ACT-family CMOS; 4.5–5.5 V supply; 24 mA output drive; faster tPLH/tPHL (≤5.5 ns); lower ICCZ (1 µA). | Lower drive strength limits fan-out to TTL loads; unsuitable for heavy bus termination or long traces. | Select when ultra-low static power and tighter timing margins are prioritized over drive capability. |
Compared with SN74BCT240N, SN64BCT240DW offers identical functionality in SOIC packaging for space-constrained PCBs; compared with SN74ACT240DW, it provides double the output current at the cost of higher quiescent power, making it preferable for legacy bus loading where drive strength is critical.
Availability
SN64BCT240DW is available at Aetrix Electronics and suitable for memory address buffering, bus transceiver interface, and clock distribution applications requiring stable component supply and proven industrial temperature performance.
Supply support for SN64BCT240DW 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 company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN64BCT240DW belongs to TI's BCT (BiCMOS Transistor-Transistor Logic) logic family, designed to bridge TTL performance with CMOS power efficiency for high-density bus interface applications in industrial control and computing systems.
FAQ
What is the operating temperature range for SN64BCT240DW?
The SN64BCT240DW is characterized for operation from −40°C to 85°C, meeting industrial-grade environmental requirements. This range is explicitly specified in the absolute maximum ratings and recommended operating conditions tables of the official Texas Instruments datasheet SCBS049A, and applies to the DW (SOIC) package variant of SN64BCT240DW.
Does SN64BCT240DW support hot insertion or live bus connection?
SN64BCT240DW does not feature explicit hot-swap or live-insertion protection circuitry. However, its high-impedance state during power-up/down and input/output voltage clamping (−0.5 V to 7 V on inputs, −0.5 V to 5.5 V on disabled outputs) provide limited tolerance for controlled live-bus scenarios-though system-level protection remains the designer's responsibility. The SN64BCT240DW datasheet confirms this behavior under "Absolute Maximum Ratings" and "Recommended Operating Conditions".
Can SN64BCT240DW drive standard TTL loads directly?
Yes, SN64BCT240DW can drive standard TTL loads directly: each output sinks 64 mA (exceeding the 16 mA typical requirement of one TTL unit load), and its VOH (≥2.4 V at IOH = −3 mA) and VOL (≤0.55 V at IOL = 64 mA) meet or exceed TTL voltage thresholds. These values are confirmed in the "Electrical Characteristics" table of the SN64BCT240DW datasheet SCBS049A.
Is SN64BCT240DW pin-compatible with SN74LS240?
SN64BCT240DW is functionally and pin-compatible with SN74LS240 in terms of logic function, pin numbering, and package outline (SOIC-20), but differs electrically: SN64BCT240DW offers higher output drive (64 mA vs. 24 mA), lower ICCZ, and BiCMOS speed/power trade-offs. The pinout diagram in the SN64BCT240DW datasheet SCBS049A matches the standard 20-pin octal buffer layout used by SN74LS240.
What is the maximum capacitive load SN64BCT240DW can drive reliably?
SN64BCT240DW is characterized for CL = 50 pF in its switching characteristics table, with guaranteed tPLH/tPHL up to 6.4 ns under those conditions. While not explicitly rated beyond 50 pF, its 64 mA output drive suggests capability to drive heavier loads (e.g., 100–150 pF) with acceptable delay increase-verified experimentally in TI application notes for BCT-family drivers. This behavior is consistent across SN64BCT240DW test conditions documented in SCBS049A.
SN64BCT240DW 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:
- -
SN64BCT240DW FAQ
1.How can I place an order for SN64BCT240DW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT240DW 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 SN64BCT240DW reliable?
The price and inventory of SN64BCT240DW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT240DW is usually 5 days.
3.What payment methods are accepted for SN64BCT240DW?
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4.How is shipping managed for SN64BCT240DW?
SN64BCT240DW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT240DW 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 SN64BCT240DW?
For technical support, including SN64BCT240DW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT240DW requirements.
6.How does Aetrix verify that SN64BCT240DW is sourced from the original manufacturer or authorized distributors?
All SN64BCT240DW 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 SN64BCT240DW meets industry standards.
7.What is the process for return or replacement of SN64BCT240DW?
All SN64BCT240DW units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT240DW, 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 SN64BCT240DW part is unused and in its original packaging.
Return procedure for SN64BCT240DW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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