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Texas Instruments SN74ABT540N
- Part No.:
- SN74ABT540N
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
SN74ABT540N.pdf
- Description:
- IC BUFFER INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:575
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Product details
Overview
SN74ABT540N from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in 5-V TTL-compatible systems. It features dual active-low output-enable inputs (OE1, OE2), high-drive capability (–32 mA IOH / 64 mA IOL), and operates across –40°C to 85°C.
For engineers reviewing the SN74ABT540N datasheet, SN74ABT540N pinout, SN74ABT540N application, or SN74ABT540N equivalent, key selection criteria include 3-state bus contention control, output drive strength, thermal performance in PDIP packaging, and compatibility with legacy 5-V TTL logic families.
Technical Context
The SN74ABT540N implements a dual-input AND gate for 3-state control, where either OE1 or OE2 high forces all eight Y outputs into high-impedance. Its EPIC-IIB BiCMOS process enables low power dissipation while maintaining TTL-level input thresholds (VIH = 2 V, VIL = 0.8 V) and fast propagation delays (tPLH/tPHL ≤ 4.8 ns at 5 V).
It supports robust system-level reliability with ESD protection exceeding 2000 V (MIL-STD-883), latch-up immunity >500 mA (JESD-17), and ground bounce (VOLP) <1 V at 25°C - critical for noise-sensitive bus interfaces in industrial control and instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - ensures stable operation under typical 5-V rail tolerances in industrial power supplies. |
| IOH / IOL | –32 mA / 64 mA - drives heavy capacitive loads (e.g., 10+ TTL inputs or long PCB traces) without signal degradation. |
| tPLH / tPHL | ≤4.8 ns at 5 V - enables reliable timing in high-speed address/data buses up to ~100 MHz clock domains. |
| VOH / VOL | ≥2.0 V at –32 mA / ≤0.55 V at 64 mA - guarantees TTL-compatible logic levels under full load conditions. |
| Operating Temp | –40°C to 85°C - qualified for commercial and extended-temperature industrial environments. |
| θJA (PDIP) | 67°C/W - defines thermal derating limit for continuous operation at ambient temperatures up to 70°C with 100% output loading. |
| Input Clamp Current | –18 mA - protects against negative transients during hot-insertion or ESD events on address/control lines. |
Pinout & Package
SN74ABT540N uses a 20-pin plastic dual in-line package (PDIP-N), with 10 pins per side. Inputs (A1–A8, OE1, OE2) are on the left side; outputs (Y1–Y8), VCC, and GND are on the right. Pin 1 is index-marked at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Noninverting data inputs; accept standard TTL voltage levels and drive internal buffers. |
| 9 | GND | Ground reference for all logic and output stages; must be low-impedance connection to minimize noise coupling. |
| 10, 20 | VCC | Primary 5-V supply; decoupling capacitor (0.1 µF) required near pin 20 for transient current stability. |
| 11, 19 | OE1, OE2 | Active-low 3-state enable inputs; OR'ed internally - either high disables all outputs. |
| 12–18 | Y1–Y7 Outputs | High-drive buffered outputs; tri-state capable with controlled rise/fall times to reduce EMI. |
| 19 | Y8 Output | Same electrical characteristics as Y1–Y7; pin 19 is last output in left-to-right sequence. |
| 20 | VCC | Second VCC connection - improves power distribution uniformity across 20-pin DIP layout. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces static power consumption by >50% vs. standard bipolar TTL while retaining full drive strength. |
| Dual Active-Low OE Control | Enables flexible bus arbitration - e.g., OE1 tied to CPU write strobe, OE2 to peripheral select for hierarchical enable logic. |
| High-Drive Outputs | Supports fan-out of ≥10 standard TTL loads per output without external pull-ups or level shifters. |
| Output Ground Bounce Suppression | VOLP < 1 V ensures signal integrity during simultaneous switching of multiple outputs on shared ground paths. |
| MIL-STD-883 ESD Rating | 2000 V HBM rating allows safe handling and board-level integration in uncontrolled assembly environments. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address bus between microcontroller and SRAM/Flash memory in programmable logic controllers. IC Role / Device Role / Timing Role: Noninverting octal buffer isolating MCU address pins from memory load capacitance; enables clean edge transitions at 20-MHz access rates. Use Value: Prevents address skew and setup-time violations caused by trace capacitance, supporting deterministic memory read/write timing. | Use Scenario: Interfacing PLC CPU module to backplane I/O expansion slots with shared data/address lines. IC Role / Device Role / Timing Role: Bidirectional bus driver enabling time-multiplexed control of multiple I/O modules via 3-state enable sequencing. Use Value: Eliminates need for discrete bus switches; dual OE inputs allow independent gating of two functional bus segments. |
| Legacy System Upgrade | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74LS244 in aging test fixtures requiring higher drive strength and lower power. IC Role / Device Role / Timing Role: Pin-compatible upgrade path delivering 2× output current and 40% lower ICC at 5 V. Use Value: Extends fixture lifetime without PCB redesign; maintains identical footprint and logic behavior while improving signal fidelity. | Use Scenario: Conditioning digital stimulus signals from FPGA-based pattern generators before routing to DUT pins. IC Role / Device Role / Timing Role: Output buffer stage providing clean, slew-controlled edges and impedance matching to 50-Ω coaxial cabling. Use Value: Reduces overshoot/ringing on 100-MHz digital waveforms, improving measurement repeatability in ATE systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244N | Octal buffer with separate OE per 4-channel group; different pinout (dual OE per half); same drive strength and voltage specs. | Requires PCB layout change due to split-enable architecture; better suited for differential bus segment control. | Select when independent enable control of two 4-bit sub-buses is required over unified 8-bit gating. |
| SN74ACT540N | Same pinout and function but ACT-family CMOS; lower ICC (24 mA max vs. 30 mA), higher VIH (3.5 V min), no BiCMOS speed advantage. | Not drop-in compatible with TTL-driven OE inputs; requires level-shifting if driven by legacy 5-V TTL sources. | Choose only if system uses pure CMOS logic family and strict low-power operation is prioritized over TTL interoperability. |
Compared with SN74ABT540N, SN74ABT244N offers segmented enable control at the cost of layout compatibility, while SN74ACT540N trades TTL input compatibility for reduced quiescent current - making SN74ABT540N optimal for direct replacement in legacy 5-V bus systems.
Availability
SN74ABT540N is available at Aetrix Electronics and suitable for industrial automation, test equipment, and legacy system maintenance requiring stable component supply and long-term obsolescence management.
Supply support for SN74ABT540N 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 50 years of innovation in industrial and automotive electronics.
The ABT logic family, including SN74ABT540N, was engineered for high-speed, high-drive 5-V TTL-compatible bus interfacing in mission-critical industrial control and instrumentation systems.
FAQ
What is the maximum output current rating for SN74ABT540N at 5 V?
The SN74ABT540N supports –32 mA high-level output current (IOH) and 64 mA low-level output current (IOL) under recommended operating conditions. These values are specified at VCC = 4.5 V to 5.5 V and ensure reliable drive into standard TTL loads without violating VOH/VOL limits. Exceeding these currents risks parametric shift or thermal stress, especially in sustained operation.
Does SN74ABT540N require external pull-up resistors on its OE inputs?
Yes - to guarantee high-impedance state during power-up or power-down, OE1 and OE2 should each be tied to VCC through a pull-up resistor. The minimum resistance value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIOs. Leaving OE floating may cause undefined output states and bus contention.
Is SN74ABT540N pin-compatible with older 74LS244 devices?
No - although both are octal buffers with 3-state outputs, SN74ABT540N has a different pinout: OE1/OE2 are on pins 11 and 19, while 74LS244 uses single OE on pin 1. Additionally, SN74ABT540N places VCC on pins 10 and 20, unlike 74LS244's single VCC on pin 20. Direct replacement requires PCB modification.
What thermal derating applies to SN74ABT540N in its PDIP package?
With θJA = 67°C/W, SN74ABT540N dissipates up to 30 mA ICC (max) at full output loading. At 25°C ambient, this yields ~2°C junction rise - well within limits. However, at 70°C ambient, power dissipation must be limited to ~1.2 W to keep TJ ≤ 125°C. Derating curves in the datasheet confirm linear reduction above 65°C ambient.
Can SN74ABT540N safely interface with 3.3-V logic systems?
SN74ABT540N is not 3.3-V tolerant: its absolute maximum input voltage is 7 V, but VIH = 2 V and VIL = 0.8 V are TTL-defined, not LVTTL. Driving it from 3.3-V CMOS may cause marginal high-level recognition. For mixed-voltage systems, use level translators or select ABT devices with explicit 3.3-V input compatibility like SN74LVC541A instead of SN74ABT540N.
SN74ABT540N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 32mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-PDIP
SN74ABT540N FAQ
1.How can I place an order for SN74ABT540N through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT540N 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 SN74ABT540N reliable?
The price and inventory of SN74ABT540N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT540N is usually 5 days.
3.What payment methods are accepted for SN74ABT540N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT540N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT540N?
SN74ABT540N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT540N 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 SN74ABT540N?
For technical support, including SN74ABT540N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT540N requirements.
6.How does Aetrix verify that SN74ABT540N is sourced from the original manufacturer or authorized distributors?
All SN74ABT540N 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 SN74ABT540N meets industry standards.
7.What is the process for return or replacement of SN74ABT540N?
All SN74ABT540N units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT540N, 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 SN74ABT540N part is unused and in its original packaging.
Return procedure for SN74ABT540N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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