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Texas Instruments SN74ABT540NSR
- Part No.:
- SN74ABT540NSR
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
SN74ABT540NSR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,690
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Product details
Overview
SN74ABT540NSR 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. Its SOP-20 (NS) package supports compact PCB layout with input/output separation.
For engineers reviewing the SN74ABT540NSR datasheet, SN74ABT540NSR pinout, SN74ABT540NSR application, or SN74ABT540NSR equivalent, key selection criteria include 3-state control logic, bus-driving current drive strength, thermal performance in SOP packaging, and compatibility with legacy ABT-family timing and voltage thresholds.
Technical Context
The SN74ABT540NSR implements a dual-input AND gate for 3-state control: both OE1 and OE2 must be low to enable outputs; either high forces all eight Y outputs into high-impedance. Its EPIC-IIB BiCMOS process enables low power dissipation while maintaining TTL-level input thresholds (VIL = 0.8 V, VIH = 2 V) and robust latch-up immunity (>500 mA per JESD17).
Propagation delays are tightly specified: tPLH/tPHL ≤ 4.8 ns at VCC = 5 V, CL = 50 pF; enable/disable times (tPZH/tPZL/tPHZ/tPLZ) range from 1.1 ns to 7.3 ns. Output ground bounce (VOLP) remains <1 V under switching load, critical for noise-sensitive bus environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5 V to 5.5 V - Ensures stable operation across standard 5-V supply tolerances without level-shifting. |
| IOH / IOL | –32 mA / 64 mA - Drives heavy capacitive loads (e.g., 10+ TTL inputs) without signal degradation. |
| Propagation Delay | tPLH/tPHL ≤ 4.8 ns - Supports >100 MHz bus toggle rates in point-to-point or lightly loaded configurations. |
| 3-State Enable Logic | Active-low 2-input AND - Enables flexible control via shared or independent OE signals; prevents partial enable glitches. |
| Operating Temperature | –40°C to 85°C - Qualified for industrial-grade embedded systems, not extended or automotive ranges. |
| VOL / VOH | 0.55 V max at 64 mA / 2.0 V min at –32 mA - Guarantees TTL-compatible logic margins under full drive conditions. |
| Input Clamp Current | –18 mA - Protects against transient overvoltage on inputs without external diodes. |
Pinout & Package
SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.27 mm lead pitch, 2.65 mm max height, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | A1–A8 Inputs | Noninverting data inputs; TTL-compatible thresholds ensure direct interfacing with 74-series logic. |
| 9, 10 | OE1, OE2 | Active-low 3-state enable inputs; AND logic prevents unintended output activation during power sequencing. |
| 11 | GND | Power return reference; dedicated pin minimizes ground bounce coupling to outputs. |
| 12, 13, 14, 15, 16, 17, 18, 19 | Y1–Y8 Outputs | High-drive 3-state outputs; pin placement opposite inputs simplifies layer routing and reduces crosstalk. |
| 20 | VCC | 5-V supply rail; decoupling capacitor placement adjacent to this pin is critical for noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| EPIC-IIB BiCMOS Process | Reduces static power vs. bipolar-only ABT while retaining speed and drive strength - ideal for thermally constrained boards. |
| Output Ground Bounce (VOLP) | <1 V at VCC = 5 V - Maintains signal integrity during simultaneous output switching on shared bus lines. |
| ESD Protection | >2000 V HBM, >200 V MM - Eliminates need for external ESD protection in controlled assembly environments. |
| Latch-Up Immunity | >500 mA per JESD17 - Prevents destructive failure during transient overvoltage or hot-insertion events. |
| Thermal Impedance (θJA) | 128°C/W (NS package) - Requires moderate copper pour and airflow for sustained 64-mA per-output operation. |
Applications
| Memory Address Buffering | Industrial Bus Interface |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM or Flash devices on a shared bus. IC Role / Device Role / Timing Role: Noninverting octal buffer with 3-state outputs isolates address drivers during memory access arbitration. Use Value: High-current drive (64 mA) ensures fast edge rates across long traces; dual OE inputs allow synchronized enable with chip-select logic. | Use Scenario: Interfacing a PLC CPU module to distributed I/O backplane with TTL-level signaling. IC Role / Device Role / Timing Role: Bus driver providing level-consistent signal amplification and isolation between controller and field-side peripherals. Use Value: Robust ESD/latch-up specs ensure reliability in electrically noisy factory environments; SOP-20 footprint fits dense backplane layouts. |
| Legacy System Upgrade | Test Equipment Signal Conditioning |
Use Scenario: Replacing obsolete 74F244 in aging instrumentation control boards requiring drop-in timing and drive compatibility. IC Role / Device Role / Timing Role: Pin-compatible octal buffer delivering identical logic function with improved power efficiency and noise margin. Use Value: Identical propagation delay (≤4.8 ns) and input thresholds guarantee no firmware or timing redesign; BiCMOS lowers board-level heat generation. | Use Scenario: Conditioning parallel digital stimulus signals in automated test equipment before routing to DUT interface connectors. IC Role / Device Role / Timing Role: Output driver stage that strengthens weak controller outputs and provides clean 3-state isolation during test vector changes. Use Value: Low VOLP (<1 V) prevents false triggering on sensitive measurement inputs; dual OE allows precise synchronization with pattern generator clocks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT244NSR | Octal buffer with separate A→Y and B→Y direction paths; noninverting only on one side; same drive strength and timing. | Requires directional control logic; unsuitable for pure bidirectional bus isolation without external gating. | Select when bidirectional data flow (e.g., shared data bus) is needed alongside 3-state control. |
| SN74LVC244APWR | 3.3-V CMOS device; lower drive (–24/24 mA); 1.65–3.6 V VCC; different input thresholds (VIH = 2.0 V @ VCC = 3.3 V). | Not TTL-compatible; requires level translation for 5-V systems; higher noise margin at 3.3 V. | Select for modern low-voltage designs where power efficiency and smaller package (TSSOP-20) outweigh 5-V compatibility needs. |
Compared with SN74ABT244NSR and SN74LVC244APWR, the SN74ABT540NSR uniquely delivers true octal noninverting buffering with dual active-low OE control in a 5-V TTL ecosystem - making it optimal for legacy bus expansion, memory interfacing, and industrial control where voltage and timing compatibility are non-negotiable.
Availability
SN74ABT540NSR is available at Aetrix Electronics and suitable for industrial bus interface, memory address buffering, and legacy system upgrade applications requiring stable component supply and long-term manufacturing continuity.
Supply support for SN74ABT540NSR 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 decades of heritage in industry-standard logic families.
The ABT logic family - including SN74ABT540NSR - was engineered for high-speed, high-drive 5-V TTL-compatible bus applications, targeting industrial control, test equipment, and computing infrastructure where reliability and timing predictability are critical.
FAQ
What is the recommended power-up sequence for SN74ABT540NSR to avoid bus contention?
To prevent undefined output states during power-up, tie OE1 and OE2 to VCC via pullup resistors (value determined by driver sink capability). This ensures all outputs remain in high-impedance until system firmware asserts valid enable signals. The SN74ABT540NSR datasheet specifies this as mandatory for glitch-free initialization. Do not leave OE pins floating.
Does SN74ABT540NSR support hot-swap or live-insertion into a powered backplane?
The SN74ABT540NSR has strong latch-up immunity (>500 mA per JESD17) and ESD protection (>2000 V HBM), but it is not rated for hot-swap operation. Its absolute maximum ratings do not cover powered insertion transients. For live-insertion, use dedicated hot-swap controllers upstream of the SN74ABT540NSR to manage inrush and fault currents.
Can SN74ABT540NSR drive a 50-pF load at 50 MHz without signal integrity issues?
Yes - with tPLH/tPHL ≤ 4.8 ns at CL = 50 pF and VCC = 5 V, the SN74ABT540NSR supports clean 20-ns period (50 MHz) toggling on individual outputs. However, simultaneous switching of all eight outputs increases ground bounce (VOLP <1 V) and supply current spikes; proper decoupling (≥100 nF ceramic + 10 µF bulk per VCC pin) is essential.
Is SN74ABT540NSR pin-compatible with older 74LS244 or 74F244 devices?
No - while functionally similar (octal noninverting buffer with 3-state), SN74ABT540NSR uses SOP-20 (NS) packaging with different pinout: inputs (A1–A8) occupy pins 1–8, outputs (Y1–Y8) occupy pins 12–19, and dual OE inputs are on pins 9–10. 74LS244/74F244 use DIP-20 or SOIC-20 with interleaved I/O. Board redesign is required for replacement.
What is the maximum continuous output current per Y pin on SN74ABT540NSR?
The SN74ABT540NSR supports up to 64 mA DC sink current (IOL) per output pin under recommended operating conditions (VCC = 4.5–5.5 V, TA = –40°C to 85°C). Exceeding this risks thermal overload or parametric shift. For sustained 64-mA loads, ensure θJA ≤ 128°C/W is met via PCB copper area and ambient cooling - verified in the NS package thermal characterization.
SN74ABT540NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SO
SN74ABT540NSR FAQ
1.How can I place an order for SN74ABT540NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ABT540NSR 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 SN74ABT540NSR reliable?
The price and inventory of SN74ABT540NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ABT540NSR is usually 5 days.
3.What payment methods are accepted for SN74ABT540NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ABT540NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ABT540NSR?
SN74ABT540NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ABT540NSR 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 SN74ABT540NSR?
For technical support, including SN74ABT540NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ABT540NSR requirements.
6.How does Aetrix verify that SN74ABT540NSR is sourced from the original manufacturer or authorized distributors?
All SN74ABT540NSR 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 SN74ABT540NSR meets industry standards.
7.What is the process for return or replacement of SN74ABT540NSR?
All SN74ABT540NSR units undergo pre-shipment inspection (PSI). If there is an issue with SN74ABT540NSR, 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 SN74ABT540NSR part is unused and in its original packaging.
Return procedure for SN74ABT540NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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