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Texas Instruments SN74LS541DBR
- Part No.:
- SN74LS541DBR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
SN74LS541DBR.pdf
- Description:
- IC BUF NON-INVERT 5.25V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,027
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Product details
Overview
SN74LS541DBR from Texas Instruments is an octal buffer/line driver with 3-state outputs, designed for bidirectional data bus interface in TTL-based digital systems. It features 8 independent non-inverting buffers, ±24 mA output drive capability, 15 ns typical propagation delay (tPLH/tPHL), and operates over 0°C to 70°C. It is used in microprocessor address/data bus buffering and memory I/O interfacing.
For engineers reviewing the SN74LS541DBR datasheet, SN74LS541DBR pinout, SN74LS541DBR application, or SN74LS541DBR equivalent, key selection criteria include 3-state output control timing, DC drive strength at VCC = 5 V, SSOP-20 thermal and layout constraints, and compatibility with legacy LS-TTL logic families.
Technical Context
The SN74LS541DBR implements dual active-low output-enable controls (OE1̅, OE2̅) enabling independent gating of two groups of four buffers. Its bipolar TTL input structure ensures compatibility with standard LS, S, and ALS logic thresholds, while its totem-pole output stage supports wired-OR configurations when outputs are externally pulled up.
Designed for bus-oriented applications, it provides high-current sourcing (24 mA) and sinking (32 mA) capability to drive multiple TTL loads without external amplification. Input clamp diodes and internal current-limiting resistors enhance ESD robustness per MIL-STD-883 Class 3B.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | LS-TTL - ensures interoperability with legacy 74LS series devices and predictable noise margins at 5 V. |
| Output Type | 3-State non-inverting - enables bidirectional bus sharing without contention when OE is high. |
| Propagation Delay | 15 ns max (tPLH/tPHL at VCC = 5 V, TA = 25°C) - supports reliable operation in 33 MHz synchronous bus environments. |
| Output Drive | ±24 mA (IOH/IOL) - drives up to 40 LS-TTL loads per output, eliminating need for bus transceivers in medium-density systems. |
| Supply Voltage | 4.75 V to 5.25 V - matches standard TTL power rail tolerances and avoids level-shifting in mixed-logic designs. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and instrumentation applications. |
| Package | SSOP-20 (DB) - 0.65 mm pitch, 7.5 mm × 5.6 mm footprint, suitable for high-density PCB layouts with automated assembly. |
Pinout & Package
SN74LS541DBR is housed in a 20-pin Small-Outline Shrink Plastic (SSOP) package (drawing DB), measuring 7.5 mm × 5.6 mm with 0.65 mm lead pitch and maximum height of 2.0 mm. The package is RoHS-compliant with NiPdAu lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (A1–A8) | Active-high TTL-compatible data inputs; accept standard LS logic levels (VIL ≤ 0.8 V, VIH ≥ 2.0 V). |
| 9, 10, 11, 12, 13, 14, 15, 16 | Outputs (Y1–Y8) | 3-state totem-pole outputs; high-impedance when either OE1̅ or OE2̅ is high. |
| 17, 19 | Output Enables (OE1̅, OE2̅) | Active-low controls; OE1̅ enables Y1–Y4, OE2̅ enables Y5–Y8 - allows split-bus control without external logic. |
| 18 | GND | Ground reference for all I/O and internal circuitry; must be connected to system common ground plane. |
| 20 | VCC | +5 V supply; bypass capacitor (0.1 µF ceramic) required within 10 mm of pin for stable switching noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual 3-state control | OE1̅ and OE2̅ separately gate two 4-bit groups - simplifies partial bus isolation in multi-peripheral systems. |
| High-output current drive | 24 mA source / 32 mA sink per output - eliminates need for external bus drivers in LS-TTL backplanes. |
| Matched propagation delays | tPLH and tPHL differ by ≤ 3 ns - minimizes skew across 8-bit data paths critical for synchronous latch timing. |
| TTL-compatible input thresholds | VIL = 0.8 V max, VIH = 2.0 V min - ensures reliable interfacing with 74LS, 74S, and microcontroller GPIOs without level shifters. |
| SSOP-20 thermal performance | RθJA = 120°C/W - supports continuous operation at full drive in ambient up to 70°C with minimal copper area. |
Applications
| Microprocessor Address Bus Buffering | Industrial PLC I/O Expansion Module |
|---|---|
Use Scenario: Isolating and driving 16-bit address lines from a Z80 or 8085 CPU to multiple peripheral decoders and memory chips. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing fanout expansion and bus contention prevention during DMA cycles. Use Value: Eliminates timing-critical discrete transistor arrays; 15 ns delay ensures setup/hold compliance with 4 MHz CPU clock domains. |
Use Scenario: Interfacing 8-channel isolated digital input cards to a central controller's parallel I/O port in factory automation cabinets. IC Role / Device Role / Timing Role: Level-translating and current-boosting interface between optocoupler outputs and controller bus. Use Value: ±24 mA drive sustains signal integrity across 30 cm ribbon cables; dual OE pins enable staggered polling of input groups. |
| Legacy Test Equipment Data Acquisition | Avionics Maintenance Diagnostic Interface |
Use Scenario: Capturing parallel sensor data (e.g., 8-bit ADC outputs) into a GPIB-controlled test bench controller running vintage firmware. IC Role / Device Role / Timing Role: Unidirectional data latching buffer synchronizing asynchronous analog-to-digital conversion results to system clock. Use Value: LS-TTL compatibility ensures bit-for-bit fidelity with 1980s-era test hardware; SSOP package fits retro-refurbished PCB real estate constraints. |
Use Scenario: Adapting ground-vehicle diagnostic tools to legacy aircraft subsystems using MIL-STD-1553B auxiliary parallel interfaces. IC Role / Device Role / Timing Role: Signal conditioning and bus arbitration element in field-deployable interface adapters. Use Value: Dual OE control allows selective activation of maintenance-mode registers without resetting entire avionics bus. |
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 |
|---|---|---|---|
| SN74LS241N | Inverting outputs; identical pinout, timing, and drive strength. | Requires logic inversion in upstream/downstream logic; unsuitable where signal polarity must be preserved. | Select SN74LS241N only if system-level inversion is acceptable or already compensated. |
| SN74LS540DBR | Non-inverting like SN74LS541DBR but with single OE̅ (pins 1 & 19 tied); same SSOP-20 package and specs. | Lacks independent group control - cannot isolate upper/lower nibbles of a bus independently. | Choose SN74LS540DBR for simpler, lower-cost bus buffering where full 8-bit enable suffices. |
Compared with SN74LS241N and SN74LS540DBR, the SN74LS541DBR uniquely supports split-bus control via dual OE pins while preserving signal polarity - critical for partial-address decoding and modular I/O expansion where timing and functional partitioning are constrained.
Availability
SN74LS541DBR is available at Aetrix Electronics and suitable for industrial control panels, legacy test equipment refurbishment, and aerospace ground-support diagnostics requiring stable component supply and long-term obsolescence mitigation.
Supply support for SN74LS541DBR 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 with deep heritage in TTL and bipolar logic design.
The SN74LS541DBR belongs to TI's legacy 74LS logic family, engineered for reliability and interoperability in industrial, military, and test equipment applications where backward compatibility and deterministic timing are essential.
FAQ
What is the maximum clock frequency supported by SN74LS541DBR in bus applications?
The SN74LS541DBR does not operate on a clock; it is an asynchronous buffer. Its 15 ns typical propagation delay enables reliable use in systems with bus cycle times ≥ 30 ns - corresponding to effective data rates up to ~33 MHz in synchronous read/write protocols. Timing margins must account for worst-case loading and trace length.
Can SN74LS541DBR be used with 3.3 V logic systems?
No - SN74LS541DBR requires a 4.75 V to 5.25 V supply and is not 3.3 V tolerant. Its inputs exceed absolute maximum ratings below 4.5 V, and output VOH/VOL thresholds are specified only at VCC = 5 V. Use level translators such as SN74LVC245 for 3.3 V ↔ 5 V interfacing.
How are the two output-enable pins (OE1̅ and OE2̅) intended to be used in practice?
OE1̅ controls outputs Y1–Y4; OE2̅ controls Y5–Y8. They are typically driven by decoded address bits or peripheral select signals - e.g., OE1̅ = A0̅·CS1, OE2̅ = A0·CS1 - enabling half-bus access during 4-bit operations or reducing capacitive load during partial transfers. Both must be low for full 8-bit drive.
Is SN74LS541DBR pin-compatible with SN74LS541N or SN74LS541DWR?
Yes - SN74LS541DBR, SN74LS541N (PDIP-20), and SN74LS541DWR (SOIC-20) share identical pin assignments, electrical specifications, and logic function. Only package dimensions, thermal resistance, and moisture sensitivity differ - no PCB redesign is needed when migrating between these variants.
Does SN74LS541DBR include internal ESD protection diodes?
Yes - SN74LS541DBR incorporates input clamp diodes to VCC and GND per MIL-STD-883 Method 3015.7, rated for ±2 kV HBM. These protect against handling ESD but do not replace system-level TVS devices for board-level surge immunity.
SN74LS541DBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Buffer, Non-Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 15mA, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
SN74LS541DBR FAQ
1.How can I place an order for SN74LS541DBR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS541DBR 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 SN74LS541DBR reliable?
The price and inventory of SN74LS541DBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS541DBR is usually 5 days.
3.What payment methods are accepted for SN74LS541DBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS541DBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS541DBR?
SN74LS541DBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS541DBR 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 SN74LS541DBR?
For technical support, including SN74LS541DBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS541DBR requirements.
6.How does Aetrix verify that SN74LS541DBR is sourced from the original manufacturer or authorized distributors?
All SN74LS541DBR 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 SN74LS541DBR meets industry standards.
7.What is the process for return or replacement of SN74LS541DBR?
All SN74LS541DBR units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS541DBR, 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 SN74LS541DBR part is unused and in its original packaging.
Return procedure for SN74LS541DBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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