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Texas Instruments SN64BCT240N
- Part No.:
- SN64BCT240N
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN64BCT240N.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Inventory:360
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Product details
Overview
SN64BCT240N 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 output drive, exhibits 3.5 ns typical propagation delay, and supports −40°C to 85°C industrial temperature range - used in memory address buffering and bus driving applications.
For engineers reviewing the SN64BCT240N datasheet, SN64BCT240N pinout, SN64BCT240N application, or SN64BCT240N equivalent, key selection criteria include its BiCMOS output stage for low ICCZ, high-impedance state during power-up/down, ESD protection >2000 V, and compatibility with TTL-level input thresholds and 5-V CMOS bus loads.
Technical Context
The SN64BCT240N implements dual 4-bit noninverting buffers with independent OE controls per section, enabling selective bus isolation. Its BiCMOS output stage combines bipolar pull-up and MOS pull-down transistors to achieve rail-to-rail swing, fast switching (tPHL ≤ 4.5 ns), and reduced quiescent current (ICCZ ≤ 9 mA).
Each buffer section passes A→Y when OE is low; outputs enter high-Z when OE is high. Input thresholds are TTL-compatible (VIL = 0.8 V, VIH = 2.0 V), and outputs drive standard 5-V CMOS loads with VOH ≥ 2.4 V at IOH = −15 mA and VOL ≤ 0.55 V at IOL = 64 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with 5-V TTL/CMOS systems and margin against supply droop. |
| Output Drive | ±64 mA - supports direct connection to heavily loaded data/address buses without external buffering. |
| Propagation Delay | 3.5 ns (tPHL, typical) - enables use in high-speed memory address and clock distribution paths up to ~100 MHz. |
| Input Thresholds | VIL = 0.8 V, VIH = 2.0 V - guarantees reliable interfacing with standard TTL logic families. |
| Power-Up Behavior | Outputs remain in high-impedance state - prevents bus contention during system reset or brown-out conditions. |
| ESD Protection | >2000 V HBM - meets MIL-STD-883C Method 3015, reducing risk of handling damage in manufacturing. |
| Operating Temperature | −40°C to 85°C - qualified for industrial-grade embedded control and instrumentation environments. |
Pinout & Package
SN64BCT240N is housed in a 20-pin plastic dual in-line package (PDIP-N), 300-mil width, with 0.1-inch lead pitch and through-hole mounting. Pin 1 is marked by a notch or dot; package height ≤ 4.95 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OE, 2OE | Active-low output-enable control | Independent enable for each 4-bit section; low = buffer enabled, high = outputs high-Z. |
| 1A1–1A4, 2A1–2A4 | Data inputs | Eight buffered inputs grouped into two 4-bit lanes; TTL-compatible voltage thresholds. |
| 1Y1–1Y4, 2Y1–2Y4 | Noninverting buffered outputs | Eight 3-state outputs with BiCMOS drivers capable of ±64 mA sink/source. |
| VCC (Pin 20) | Positive supply | 5-V nominal supply; must be decoupled locally to suppress switching noise on shared bus lines. |
| GND (Pin 10) | Ground reference | Common return for all inputs, outputs, and internal circuitry; critical for noise immunity and signal integrity. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS output architecture | Reduces ICCZ to ≤9 mA while maintaining TTL-compatible drive strength and speed. |
| Independent dual-section OE control | Enables selective activation of two 4-bit lanes - ideal for split-bus or multi-module address decoding. |
| Power-up/power-down high-Z | Prevents bus contention during system initialization or shutdown without external reset sequencing. |
| TTL-compatible input thresholds | Accepts standard 5-V TTL logic levels directly - eliminates need for level-shifting circuitry. |
| High ESD robustness | Exceeds 2000 V HBM - improves yield in automated assembly and field reliability in unshielded environments. |
Applications
| Memory Address Buffering | System Bus Driver |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or EPROM chips in an industrial PLC backplane. IC Role / Device Role / Timing Role: Noninverting 3-state buffer isolating CPU address bus from memory modules; enables time-multiplexed access via OE control. Use Value: Delivers 64 mA drive per output to meet setup/hold timing across long traces and multiple loads, with sub-5 ns propagation ensuring cycle-time compliance. |
Use Scenario: Interfacing a DSP's external memory interface to a shared data bus with multiple peripherals in test equipment. IC Role / Device Role / Timing Role: Bidirectional bus driver (with external direction control) providing level translation and load isolation between mismatched logic families. Use Value: High-impedance state during bus arbitration prevents signal contention; BiCMOS output reduces ground bounce versus pure bipolar alternatives. |
| Legacy ISA Bus Interface | Industrial I/O Expansion |
|
Use Scenario: Adding parallel I/O capability to an x86-based industrial controller using ISA slot signals. IC Role / Device Role / Timing Role: Address/data latch buffer for ISA address strobes and control signals, synchronized to BALE and IOR/IOW. Use Value: Meets ISA timing requirements with tPZH ≤ 9.2 ns and supports hot-insertion-safe high-Z behavior during slot enumeration. |
Use Scenario: Expanding GPIO count on a programmable logic controller (PLC) CPU module via parallel I/O daughterboard. IC Role / Device Role / Timing Role: Level-shifting and fanout buffer for digital input conditioning and output drive to relay drivers or optocouplers. Use Value: −40°C to 85°C rating ensures operation in cabinet-mounted enclosures; 2000 V ESD withstand protects against field wiring transients. |
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 | Same pinout and function but rated only for 0°C to 70°C; lower ICCZ (≤7 mA) and slightly slower tPHL (≤5 ns). | Restricted to commercial-temperature systems; not suitable for extended industrial ambient. | Select SN74BCT240N only if operating temperature stays within 0°C–70°C and lower quiescent current is prioritized. |
| SN64FCT240N | FCT-family CMOS variant; lower ICCZ (≤10 µA), faster tPHL (≤3.2 ns), but only 24 mA output drive and no BiCMOS rail-swing. | Better for low-power, high-speed bus gating where load current ≤24 mA suffices. | Choose SN64FCT240N when minimizing static power dominates over drive strength and full-rail output swing is not required. |
Compared with SN74BCT240N and SN64FCT240N, the SN64BCT240N uniquely balances industrial temperature range, 64 mA drive, and BiCMOS output swing - making it optimal for legacy 5-V bus systems requiring robust loading and thermal resilience.
Availability
SN64BCT240N is available at Aetrix Electronics and suitable for industrial control systems, legacy computer bus interfaces, and embedded memory expansion modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for SN64BCT240N 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 SN64BCT240N belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, engineered for high-speed, high-drive 5-V bus interface applications where TTL compatibility, low ICCZ, and industrial temperature operation are essential.
FAQ
What is the operating temperature range specified for the SN64BCT240N?
The SN64BCT240N is characterized for operation from −40°C to 85°C, meeting industrial-grade environmental requirements. This range is explicitly confirmed in the "recommended operating conditions" table of the SCBS049A datasheet and applies to all electrical specifications unless otherwise noted. The SN64BCT240N maintains full functionality-including propagation delay, drive strength, and high-impedance behavior-across this full span.
Does the SN64BCT240N support true 5-V TTL input compatibility?
Yes, the SN64BCT240N supports true 5-V TTL input compatibility with guaranteed VIL ≤ 0.8 V and VIH ≥ 2.0 V under recommended operating conditions. These thresholds match standard TTL logic families, allowing direct connection to 74LS, 74ALS, and other TTL outputs without level shifting. Input clamp current is also specified at −18 mA, supporting robust noise margin.
Is the SN64BCT240N pin-compatible with the SN74BCT240N?
Yes, the SN64BCT240N is pin-compatible with the SN74BCT240N in the PDIP-N package: both use identical 20-pin layouts, pin functions, and pin numbering. However, the SN64BCT240N extends the operating temperature range to −40°C to 85°C and specifies tighter ICCZ (≤9 mA vs. ≤7 mA), making it the preferred choice for industrial deployments where thermal resilience is critical.
What is the maximum output current the SN64BCT240N can sink or source per pin?
The SN64BCT240N can sink up to 64 mA per output pin (IOL = 64 mA) and source up to 15 mA (IOH = −15 mA), as verified in the "electrical characteristics" table of the SCBS049A datasheet. This asymmetry reflects its BiCMOS output structure optimized for driving capacitive bus loads with strong low-side pull-down, while maintaining sufficient high-side drive for TTL-compatible VOH.
How does the SN64BCT240N behave during power-up and power-down sequences?
The SN64BCT240N enters a high-impedance state on all outputs during both power-up and power-down, regardless of OE pin state, as confirmed in the device description and absolute maximum ratings section. This behavior is inherent to its BiCMOS design and prevents bus contention in systems with asynchronous power sequencing - a key requirement for reliable operation in industrial backplanes and modular controllers.
SN64BCT240N 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:
- -
SN64BCT240N FAQ
1.How can I place an order for SN64BCT240N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT240N 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 SN64BCT240N reliable?
The price and inventory of SN64BCT240N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT240N is usually 5 days.
3.What payment methods are accepted for SN64BCT240N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN64BCT240N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN64BCT240N?
SN64BCT240N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT240N 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 SN64BCT240N?
For technical support, including SN64BCT240N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT240N requirements.
6.How does Aetrix verify that SN64BCT240N is sourced from the original manufacturer or authorized distributors?
All SN64BCT240N 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 SN64BCT240N meets industry standards.
7.What is the process for return or replacement of SN64BCT240N?
All SN64BCT240N units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT240N, 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 SN64BCT240N part is unused and in its original packaging.
Return procedure for SN64BCT240N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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