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Texas Instruments SN64BCT541AN
- Part No.:
- SN64BCT541AN
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
-
SN64BCT541AN.pdf
- Description:
- BUS DRIVER, BCT/FBT SERIES
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Product details
Overview
SN64BCT541AN from Texas Instruments is an octal non-inverting 3-state buffer/line driver with dual active-low output-enable inputs (OE1, OE2), BiCMOS design, 64 mA low-level output drive, and data flow-through pinout for PCB layout optimization. It operates from 4.5 V to 5.5 V across −40°C to 85°C and is used in memory address buffering and bus line driving applications.
For engineers reviewing the SN64BCT541AN datasheet, SN64BCT541AN pinout, SN64BCT541AN application, or SN64BCT541AN equivalent, key selection criteria include its dual 3-state control logic, high-impedance state during power-up/down, P-N-P input structure reducing DC loading, and compatibility with 5-V TTL/CMOS bus systems.
Technical Context
The SN64BCT541AN implements a dual-gated 3-state control architecture: both OE1 and OE2 must be low for outputs Y1–Y8 to drive; either OE high forces all outputs into high-impedance. Its BiCMOS process enables low standby current while supporting TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and robust output drive (IOL = 64 mA).
Input and output pins are arranged on opposite sides of the 20-pin PDIP package to minimize trace crosstalk and simplify routing. The device enters high-Z during power transitions below ~3 V, preventing bus contention - a critical feature for hot-swap and system initialization integrity in memory and peripheral interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation within standard 5-V TTL supply tolerance bands. |
| IOL (Low-level Output) | 64 mA - drives heavy capacitive bus loads without signal degradation or excessive voltage drop. |
| tPLH / tPHL | 2.1 ns to 7.5 ns - supports high-speed address/data buffering in sub-10 ns timing-critical paths. |
| IOZH / IOZL | ±50 µA - guarantees minimal leakage in 3-state mode, preserving bus integrity during disable. |
| VIK (Input Clamp Voltage) | −1.2 V - protects inputs against negative transients up to 1.2 V below ground without damage. |
| Operating Temperature | −40°C to 85°C - qualified for industrial-grade embedded systems and memory subsystems. |
| Input Structure | P-N-P inputs - reduce DC loading on upstream drivers, lowering power consumption and fanout burden. |
Pinout & Package
SN64BCT541AN uses a 20-pin plastic DIP (N package), 300-mil width, with 0.1-inch lead pitch. Pin 1 is marked by a notch or dot; leads are numbered counter-clockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low 3-state enable inputs - AND logic: both must be low for output drive; either high disables all Y outputs. |
| 2–9 | A1–A8 | True (non-inverting) data inputs - directly connected to internal buffers with P-N-P input stage. |
| 11–18 | Y1–Y8 | True 3-state outputs - drive bus lines or memory address registers with 64 mA sink capability. |
| 10 | GND | Ground reference - common return for all signals and power. |
| 20 | VCC | Positive supply - powers BiCMOS output stage and input circuitry at 4.5–5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| BiCMOS design | Reduces standby current vs. pure bipolar, enabling lower static power in always-on address buffers. |
| Data flow-through pinout | Inputs (A1–A8, OE1/OE2) on left side, outputs (Y1–Y8) on right side - minimizes layer crossings and crosstalk on 2-layer PCBs. |
| Power-up/power-down high-Z | Outputs remain high-impedance while VCC < ~3 V - prevents bus contention during supply ramping or brownout. |
| P-N-P inputs | Lower input DC loading vs. standard TTL - reduces fanout burden and improves noise margin on shared address lines. |
| ESD protection | >2000 V per MIL-STD-883C Method 3015 - enhances handling robustness in manufacturing and field service environments. |
Applications
| Memory Address Buffering | Parallel Bus Interface |
|---|---|
|
Use Scenario: Buffering CPU-generated address signals before driving multiple RAM or ROM chips on a shared address bus. IC Role / Device Role / Timing Role: Non-inverting octal buffer with dual 3-state control, synchronizing address propagation while isolating source from bus capacitance. Use Value: Enables clean, low-skew address delivery to up to eight memory devices using single-cycle enable control via OE1/OE2. |
Use Scenario: Isolating and driving bidirectional data/control lines between microcontroller peripherals and external I/O expanders or display controllers. IC Role / Device Role / Timing Role: 3-state line driver managing direction-controlled bus segments with fast enable/disable timing (tPZH/tPLZ ≤ 10.7 ns). Use Value: Prevents signal contention during bus arbitration by ensuring deterministic high-Z transitions synchronized to control logic edges. |
| Industrial Control Backplane | Legacy System Upgrade Interface |
|
Use Scenario: Driving long-trace address/data buses in PLC backplanes where noise immunity and drive strength are critical. IC Role / Device Role / Timing Role: Robust octal driver with 64 mA sink capability and −40°C to 85°C qualification for harsh ambient conditions. Use Value: Maintains signal integrity over 10+ inch traces under EMI stress, eliminating need for additional repeaters or level shifters. |
Use Scenario: Interfacing modern microcontrollers with legacy 5-V TTL-based peripheral modules lacking native 3-state support. IC Role / Device Role / Timing Role: Level-shifting and bus-driving interface providing controlled enable sequencing and hot-swap-safe power transition behavior. Use Value: Allows safe integration without redesigning PCB layout - leverages existing pinout and flow-through routing compatibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74BCT541N | Same pinout and function but rated only for 0°C to 70°C industrial range; lacks −40°C low-temp qualification. | Suitable for commercial-grade systems without extended temperature requirements. | Select SN74BCT541N only if operating ambient stays above 0°C and cost sensitivity outweighs industrial reliability needs. |
| SN64F541N | FET-input TTL version - higher input impedance but lower drive (IOL = 20 mA) and slower propagation (tPHL up to 15 ns). | Acceptable for low-capacitance, low-speed address latching where power efficiency > speed. | Choose SN64F541N when interfacing high-impedance sources and bus loads < 30 pF; avoid for dense memory arrays or fast buses. |
Compared with SN74BCT541N and SN64F541N, the SN64BCT541AN provides full industrial temperature support, superior drive strength, and faster switching - making it the preferred choice for mission-critical memory and bus infrastructure where reliability and timing margin are essential.
Availability
SN64BCT541AN is available at Aetrix Electronics and suitable for memory subsystem design, industrial backplane interconnect, and legacy system interface applications requiring stable component supply and long-term obsolescence management.
Supply support for SN64BCT541AN 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 specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in industrial, automotive, and computing electronics.
The SN64BCT541AN belongs to TI's BCT (Bipolar-CMOS Transistor) logic family, designed specifically for high-drive, low-noise 5-V bus interfacing in memory and control systems where signal integrity and thermal robustness are critical.
FAQ
What is the operating voltage range for the SN64BCT541AN?
The SN64BCT541AN operates from 4.5 V to 5.5 V. This range ensures compatibility with standard 5-V TTL and CMOS logic families while maintaining stable output drive and input threshold performance. Operation outside this window - especially below 4.5 V - risks degraded noise margins and unreliable 3-state control, as confirmed in the recommended operating conditions table of the SCBS031B datasheet.
Does the SN64BCT541AN support hot-swap or power sequencing?
Yes, the SN64BCT541AN supports safe power sequencing: its outputs enter high-impedance automatically when VCC drops below approximately 3 V during power-down, and remain in high-Z until VCC rises above that threshold during power-up. This behavior prevents bus contention in systems with staggered supply ramps, as explicitly documented in the functional description and absolute maximum ratings section of the datasheet.
What is the purpose of the dual OE inputs (OE1 and OE2) on the SN64BCT541AN?
The SN64BCT541AN uses OE1 and OE2 as active-low inputs wired to an internal AND gate - both must be low for Y1–Y8 to drive; either high forces all outputs into high-impedance. This dual-control architecture allows flexible system-level enable logic, such as combining chip-select and write-enable signals, and is verified in the FUNCTION TABLE and logic diagram of the SCBS031B datasheet.
Can the SN64BCT541AN drive standard 50-pF bus loads at 10 MHz?
Yes, the SN64BCT541AN is characterized for CL = 50 pF in its switching characteristics table, with tPLH/tPHL ≤ 7.5 ns at VCC = 5 V. At 10 MHz (100 ns period), this leaves >90 ns of valid setup/hold margin per cycle, confirming reliable operation on typical 50-pF PCB traces and TTL-compatible loads - consistent with its intended use in memory-address and data-bus applications.
Is the SN64BCT541AN RoHS compliant?
The SN64BCT541AN is marked OBSOLETE in TI's packaging addendum with "TBD" for Eco Plan, indicating no formal Pb-Free or RoHS conversion was completed prior to discontinuation. As a legacy PDIP device manufactured before widespread RoHS enforcement, it contains leaded solder and is not RoHS compliant - confirmed by TI's Package Option Addendum dated 11-Apr-2013.
SN64BCT541AN 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:
- -
SN64BCT541AN FAQ
1.How can I place an order for SN64BCT541AN through Aetrix?
Please submit a Request for Quotation (RFQ) for SN64BCT541AN 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 SN64BCT541AN reliable?
The price and inventory of SN64BCT541AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN64BCT541AN is usually 5 days.
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4.How is shipping managed for SN64BCT541AN?
SN64BCT541AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN64BCT541AN 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 SN64BCT541AN?
For technical support, including SN64BCT541AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN64BCT541AN requirements.
6.How does Aetrix verify that SN64BCT541AN is sourced from the original manufacturer or authorized distributors?
All SN64BCT541AN 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 SN64BCT541AN meets industry standards.
7.What is the process for return or replacement of SN64BCT541AN?
All SN64BCT541AN units undergo pre-shipment inspection (PSI). If there is an issue with SN64BCT541AN, 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 SN64BCT541AN part is unused and in its original packaging.
Return procedure for SN64BCT541AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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