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Texas Instruments SN74BCT541ADB
- Part No.:
- SN74BCT541ADB
- Manufacturer:
- Texas Instruments
- Package:
- -
- Datasheet:
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SN74BCT541ADB.pdf
- Description:
- BUFF/DVR TRI-ST 8BIT 20SSOP
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Product details
Overview
SN74BCT541ADB from Texas Instruments is an octal buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 5-V TTL-compatible systems. It operates from 4.5 V to 5.5 V, features BiCMOS technology, supports 128 mA low-level output current, and uses a data flow-through pinout with inputs and outputs on opposite package sides.
For engineers reviewing the SN74BCT541ADB datasheet, SN74BCT541ADB pinout, SN74BCT541ADB application, or SN74BCT541ADB equivalent, this device is selected for high-drive, low-ICCZ bus interface tasks requiring dual active-low 3-state enable control (OE1/OE2), P-N-P input structure for reduced DC loading, and compatibility with standard SOIC-20 layouts.
Technical Context
The SN74BCT541ADB implements two independent 3-state enable inputs (OE1 and OE2) wired as a 2-input AND gate with active-low logic: either OE high forces all eight Y outputs into high-impedance state. Its BiCMOS design integrates bipolar output stages for high current drive (128 mA sink) and CMOS input circuitry with P-N-P inputs to minimize DC loading on upstream sources.
Propagation delays are tightly specified: tPLH/tPHL ≤ 6.0 ns and tPZH/tPZL ≤ 10.7 ns at VCC = 4.5–5.5 V, CL = 50 pF. Input and output capacitances are 5 pF and 10 pF respectively, supporting clean signal integrity in dense PCB routing environments where input/output separation aids layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures compatibility with standard 5-V TTL and mixed-voltage backplane interfaces. |
| Low-Level Output Current | 64 mA per output - drives heavy capacitive bus loads without excessive voltage drop (VOL ≤ 0.55 V). |
| 3-State Enable Logic | Active-low 2-input AND (OE1 ∧ OE2) - enables flexible bus arbitration using either single or dual enable signals. |
| Propagation Delay | tPHL ≤ 8.2 ns - supports >100 MHz bus toggle rates in memory address or data path applications. |
| Input Structure | P-N-P input stage - reduces input DC loading to ≤ –0.6 mA (IIL), minimizing fanout burden on preceding logic. |
| Quiescent Supply Current | ICCZ ≤ 7 mA - significantly lower than bipolar-only equivalents, reducing system standby power. |
| Package | SOIC-20 (DW) - industry-standard 0.300″ wide body with 1.27 mm pitch, compatible with automated assembly. |
Pinout & Package
SN74BCT541ADB is supplied in a 20-pin SOIC (DW) package, 7.5 mm × 12.8 mm footprint, 2.65 mm max height, RoHS-compliant with NiPdAu lead finish and Level-1 moisture sensitivity rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs A1–A8 | True logic inputs accepting TTL/CMOS levels; P-N-P structure minimizes DC loading on source drivers. |
| 9 | GND | Ground reference for all internal circuitry and output stage return path. |
| 10, 20 | VCC | Primary power supply connection; decoupling required within 10 mm of both pins for noise immunity. |
| 11, 19 | OE1, OE2 | Active-low 3-state enable inputs; AND logic requires both low for output assertion - prevents bus contention during power sequencing. |
| 12, 13, 14, 15, 16, 17, 18, 20 | Outputs Y1–Y8 | Buffered, totem-pole outputs capable of sinking 64 mA; high-impedance state when either OE is high. |
Key Features
| Feature | Design Value |
|---|---|
| Data Flow-Through Pinout | Inputs (A1–A8) on left side, outputs (Y1–Y8) on right side - enables straight-layer PCB routing with minimal trace crossovers and stubs. |
| BiCMOS Output Stage | Combines bipolar saturation drive (128 mA sink) with CMOS input efficiency - achieves high-speed switching without excessive ICC. |
| Dual Active-Low 3-State Control | OE1 and OE2 form an AND gate - allows hierarchical bus enable schemes (e.g., local + global enable) without external logic. |
| P-N-P Input Structure | Reduces input current draw to –0.6 mA (IIL) - increases fanout capability and eases drive requirements from legacy TTL sources. |
| Low ICCZ Quiescent Current | 5–7 mA in 3-state mode - cuts standby power vs. standard BCT devices, critical in multi-driver bus systems. |
Applications
| Memory Address Buffering | Parallel Bus Driver |
|---|---|
Use Scenario: Buffering 8-bit address lines between microcontroller and SRAM or EPROM in embedded control systems. IC Role / Device Role / Timing Role: Level-shifting and fanout amplification for address latching; provides clean, low-skew transitions to meet memory setup/hold timing. Use Value: Enables reliable 8-bit address propagation across 10+ cm traces with 64 mA drive margin, eliminating signal degradation at 20 MHz access rates. | Use Scenario: Driving shared data/address buses in industrial PLC backplanes with multiple slot controllers. IC Role / Device Role / Timing Role: Bidirectional bus isolation element controlled by system arbitration logic via OE1/OE2. Use Value: Prevents bus contention through fast 3-state disable (tPZL ≤ 11.5 ns) and supports hot-swap-safe enable sequencing via pull-up biasing. |
| Legacy System Interface | TTL-to-Backplane Translator |
Use Scenario: Interfacing modern microcontrollers to legacy 5-V TTL peripherals such as parallel printers or instrumentation DACs. IC Role / Device Role / Timing Role: Voltage- and current-compatible buffer ensuring TTL logic thresholds and drive strength compliance. Use Value: Eliminates need for discrete resistor networks or level translators while maintaining <6 ns propagation delay for real-time I/O response. | Use Scenario: Driving long-haul 5-V parallel backplane traces (>15 cm) in test equipment mainframes. IC Role / Device Role / Timing Role: High-current line driver with controlled edge rates and low-output impedance to suppress reflections. Use Value: Sustains signal integrity over 50 Ω terminated lines with VOL ≤ 0.55 V at 64 mA, enabling error-free operation up to 30 MHz. |
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 |
|---|---|---|---|
| SN74LS244N | Bipolar TTL design; 24 mA output drive; higher ICC (44 mA typical); no BiCMOS ICCZ reduction. | Limited to lower-speed (<15 MHz), low-fanout systems due to slower tPLH (15 ns) and weaker drive. | Select when cost sensitivity outweighs speed/power needs and legacy LS compatibility is mandatory. |
| SN74LVC244APWR | 3.3-V CMOS; 24 mA drive; 3.6-V max VCC; different logic thresholds and enable polarity (active-high). | Requires level translation for 5-V bus use; unsuitable for direct replacement without redesign. | Choose only for new 3.3-V systems with strict low-voltage compliance; not a functional substitute for SN74BCT541ADB. |
Compared with SN74LS244N, SN74BCT541ADB delivers 2.7× higher output current and 40% lower quiescent power in 3-state mode; versus SN74LVC244APWR, it provides native 5-V operation and TTL-compatible inputs without external translation circuitry.
Availability
SN74BCT541ADB is available at Aetrix Electronics and suitable for memory address buffering, parallel bus driving, legacy system interfacing, and TTL backplane translation requiring stable component supply across industrial, test equipment, and embedded controller programs.
Supply support for SN74BCT541ADB 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 delivering analog, embedded processing, and logic solutions with emphasis on reliability, longevity, and industrial-grade performance.
The SN74BCT541ADB belongs to TI's BCT logic family, engineered specifically for high-drive, low-noise 5-V bus interface applications where TTL compatibility, fast enable/disable timing, and robust output stages are essential.
FAQ
What is the recommended power-up sequence for SN74BCT541ADB to avoid bus contention?
TI recommends tying OE1 and OE2 to VCC via pull-up resistors (value determined by driver sink capability) to ensure outputs remain in high-impedance state during power ramp. This prevents undefined states on shared buses. The SN74BCT541ADB datasheet specifies this as mandatory for safe power sequencing, especially when interfacing with microcontrollers lacking synchronized enable control.
Can SN74BCT541ADB drive a 50-Ω terminated transmission line directly?
Yes - SN74BCT541ADB can drive a 50-Ω line under DC conditions: its 64 mA low-level output current supports VOL ≤ 0.55 V into 50 Ω (0.55 V / 50 Ω = 11 mA), well within rating. For AC integrity, use series termination near the driver and maintain controlled impedance routing; the SN74BCT541ADB's 10 pF output capacitance and sub-8 ns delays support clean edges up to 30 MHz.
Does SN74BCT541ADB support mixed-voltage operation (e.g., 3.3-V inputs)?
No - SN74BCT541ADB is strictly a 5-V device. Its input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) are TTL-compatible but not guaranteed for 3.3-V logic families. Driving it from 3.3-V sources risks marginal VIH margins and increased static current; level-shifting is required. The SN74BCT541ADB datasheet defines operation only across 4.5–5.5 V VCC with TTL-level inputs.
What is the maximum capacitive load SN74BCT541ADB can drive while maintaining timing specs?
The SN74BCT541ADB switching characteristics are characterized at CL = 50 pF. While it can drive heavier loads, propagation and enable/disable delays increase linearly with capacitance. For designs requiring tPHL ≤ 8.2 ns, keep total load (trace + receiver + probe) ≤ 50 pF. At 100 pF, delays increase ~30%; derating curves in the SN74BCT541ADB datasheet confirm this trend.
Is SN74BCT541ADB pin-compatible with SN74BCT541AN or other variants?
Yes - SN74BCT541ADB shares identical pinout, function, and timing with SN74BCT541AN (PDIP-20) and SN74BCT541ADWR (SOIC-20 tape-and-reel). All variants use the same DW/N/NS/FK/J/W package mappings defined in the SN74BCT541ADB datasheet, enabling direct PCB footprint reuse across package types without layout changes.
SN74BCT541ADB 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:
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- Mounting Type:
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- Supplier Device Package:
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SN74BCT541ADB FAQ
1.How can I place an order for SN74BCT541ADB through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74BCT541ADB 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 SN74BCT541ADB reliable?
The price and inventory of SN74BCT541ADB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74BCT541ADB is usually 5 days.
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4.How is shipping managed for SN74BCT541ADB?
SN74BCT541ADB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74BCT541ADB 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 SN74BCT541ADB?
For technical support, including SN74BCT541ADB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74BCT541ADB requirements.
6.How does Aetrix verify that SN74BCT541ADB is sourced from the original manufacturer or authorized distributors?
All SN74BCT541ADB 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 SN74BCT541ADB meets industry standards.
7.What is the process for return or replacement of SN74BCT541ADB?
All SN74BCT541ADB units undergo pre-shipment inspection (PSI). If there is an issue with SN74BCT541ADB, 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 SN74BCT541ADB part is unused and in its original packaging.
Return procedure for SN74BCT541ADB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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