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NXP Semiconductors 74ABT540DB,118
- Part No.:
- 74ABT540DB,118
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT540DB,118.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,304
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Product details
Overview
74ABT540DB,118 from NXP Semiconductors (formerly Philips) is an octal inverting 3-state buffer IC designed for high-speed bus interface applications. It features 8 data inputs (A0–A7), 8 inverted outputs (Y0–Y7), dual output enables (OE0/OE1), ±32mA/±64mA drive capability, and operates over –40°C to +85°C at 4.5V–5.5V supply. It is used in address/data bus driving where controlled signal direction and bus contention avoidance are required.
For engineers reviewing the 74ABT540DB,118 datasheet, 74ABT540DB,118 pinout, 74ABT540DB,118 application, or 74ABT540DB,118 equivalent, key selection criteria include propagation delay (≤4.3 ns), 3-state enable/disable timing (tPZH ≤ 6.4 ns), output drive asymmetry (+64mA sink / –32mA source), input/output capacitance (3 pF / 7 pF), and compliance with JEDEC latch-up (>500 mA) and ESD standards (2000 V HBM).
Technical Context
The 74ABT540DB,118 implements a BiCMOS architecture delivering low static and dynamic power dissipation while maintaining TTL-compatible logic thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) and fast edge rates (input transition rate ≤10 ns/V). Its dual enable inputs (OE0 and OE1) allow independent control of two groups of outputs, supporting flexible bus partitioning.
It supports live insertion/extraction and power-up 3-state behavior, ensuring outputs remain high-impedance during power ramp-up. The device's pinout places inputs on one side (pins 2–9) and outputs on the opposite side (pins 11–18), optimizing PCB trace routing for parallel bus layouts.
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 systems. |
| Propagation Delay (tPLH/tPHL) | Max 4.3 ns at CL = 50 pF - Enables reliable operation in high-speed digital buses up to ~100 MHz clock domains. |
| Output Drive (IOL/IOH) | +64 mA sink / –32 mA source - Supports heavy capacitive loads and fan-out to multiple TTL inputs without external buffering. |
| Input Capacitance | 3 pF - Minimizes loading on upstream drivers and preserves signal integrity in dense bus topologies. |
| 3-State Leakage (IOZL/IOZH) | ±50 µA max - Guarantees robust high-impedance isolation when outputs are disabled, preventing bus leakage current accumulation. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial-grade embedded control, instrumentation, and telecom line-card environments. |
Pinout & Package
74ABT540DB,118 is housed in a 20-pin plastic SSOP Type II package (SOT339-1), 5.3 mm body width, with gull-wing leads and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE0, OE1 | Dual active-low output enable controls - Allows selective activation of output groups for segmented bus management. |
| 2–9 | A0–A7 | Inverting data inputs - Each input drives corresponding inverted output when associated OE is asserted. |
| 11–18 | Y0–Y7 | Inverted 3-state outputs - Outputs reflect logical complement of A0–A7 only when OE0/OE1 = L; otherwise high-Z. |
| 10 | GND | Ground reference - Shared return path for all I/O and internal circuitry; must be low-inductance connection. |
| 20 | VCC | Positive supply - Powers internal BiCMOS logic and output stages; requires local 0.1 µF decoupling. |
Key Features
| Feature | Design Value |
|---|---|
| Octal inverting 3-state buffers | Enables bidirectional bus control with polarity inversion and contention-safe tri-state arbitration. |
| Live insertion/extraction support | Allows hot-swap replacement in backplane or modular systems without powering down adjacent circuitry. |
| Latch-up immunity >500 mA | Meets JEDEC JC40.2 - Prevents destructive latch-up under transient overvoltage or ESD events in real-world PCB environments. |
| Power-up 3-state behavior | Guarantees outputs remain high-impedance until VCC stabilizes - eliminates spurious bus glitches during power sequencing. |
Applications
| Microprocessor Address Bus Driver | Industrial PLC I/O Expansion Module |
|---|---|
Use Scenario: Driving 8-bit address lines from a microcontroller to multiple peripheral decoders in a compact industrial controller. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level-shifted, high-current drive with precise enable timing to prevent address bus contention. Use Value: Propagation delay ≤4.3 ns ensures setup/hold timing margins for 20+ MHz CPU address strobes; ±64 mA drive sustains signal integrity across 10 cm routed traces. | Use Scenario: Isolating and buffering digital I/O signals between a main PLC CPU board and hot-pluggable I/O daughter cards. IC Role / Device Role / Timing Role: Bus interface buffer enabling live insertion via dual OE control and power-up 3-state safety. Use Value: Live insertion support and >500 mA latch-up immunity allow safe field replacement without system shutdown; SSOP package fits space-constrained card-edge connectors. |
| Legacy ISA Bus Signal Repeater | Test Equipment Digital Pattern Generator |
Use Scenario: Repeating and inverting ISA bus control signals (e.g., IOR#, MEMR#) across a long backplane trace with impedance matching. IC Role / Device Role / Timing Role: High-speed inverting repeater with matched tPLH/tPHL and low COUT (7 pF) minimizing signal distortion. Use Value: 7 pF output capacitance reduces RC delay on 50 Ω terminated lines; 4.3 ns max delay preserves ISA timing budgets for 8 MHz operation. | Use Scenario: Generating synchronized, inverted stimulus patterns for DUT testing in automated test equipment (ATE) racks. IC Role / Device Role / Timing Role: Precision-controlled 3-state pattern driver with deterministic enable/disable timing (tPZH ≤ 6.4 ns). Use Value: Tight enable/disable skew (<0.5 ns typical) ensures simultaneous pattern assertion across 8 channels; ±32 mA sourcing supports TTL-level comparator inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT240N | Same ABT family, identical logic function and AC specs, but in 20-pin PDIP (SOT146-1) instead of SSOP. | Requires different PCB footprint and has higher thermal resistance; suitable for prototyping or through-hole assembly. | Select when manual soldering, breadboarding, or legacy through-hole manufacturing is required. |
| 74LVT540PW | Lower voltage operation (2.7–3.6 V), reduced drive (±24 mA), faster propagation (≤3.2 ns), TSSOP-20 (SOT360-1) package. | Not 5 V compatible; intended for mixed-voltage 3.3 V systems with tighter timing budgets. | Select only for 3.3 V designs requiring lower power and higher speed - not a drop-in replacement for 5 V operation. |
Compared with SN74ABT240N and 74LVT540PW, the 74ABT540DB,118 provides optimal 5 V bus drive strength and industrial temperature range in a space-saving SSOP package, making it preferred for volume production in industrial control and legacy computing interfaces where 5 V compatibility and layout density are critical.
Availability
74ABT540DB,118 is available at Aetrix Electronics and suitable for industrial PLCs, test equipment, legacy computer backplanes, and embedded bus interface modules requiring stable component supply and long-term lifecycle support.
Supply support for 74ABT540DB,118 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
NXP Semiconductors is a global semiconductor leader focused on secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering logic and analog product development.
The 74ABT series was engineered for high-speed, low-power 5 V TTL-compatible bus interfacing in industrial and computing systems - emphasizing robustness, timing precision, and mixed-technology interoperability.
FAQ
What is the maximum operating frequency supported by the 74ABT540DB,118?
The 74ABT540DB,118 does not specify a maximum clock frequency directly, but its 4.3 ns maximum propagation delay (tPLH/tPHL) at CL = 50 pF implies reliable operation in digital systems with signal periods ≥10 ns - supporting effective bus toggle rates up to approximately 100 MHz in well-terminated, low-skew configurations. Actual usable frequency depends on PCB layout, load capacitance, and system timing margins.
Does the 74ABT540DB,118 support hot-swap or live insertion?
Yes, the 74ABT540DB,118 explicitly supports live insertion and extraction per its datasheet features. This is enabled by its BiCMOS design, power-up 3-state behavior, and robust ESD/latch-up protection (2000 V HBM, >500 mA latch-up immunity), allowing safe insertion into powered-backplane systems without disrupting adjacent circuitry.
What is the function of pins 1 and 19 on the 74ABT540DB,118?
Pins 1 and 19 are OE0 and OE1 - active-low output enable inputs. When either is low, the corresponding group of four outputs (e.g., Y0–Y3 for OE0, Y4–Y7 for OE1) becomes active and inverted; when both are high, all eight outputs enter high-impedance state. This dual-enable structure allows granular bus segment control in the 74ABT540DB,118.
Can the 74ABT540DB,118 operate at 3.3 V supply?
No, the 74ABT540DB,118 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions. Supplying 3.3 V may result in undefined logic levels, excessive propagation delay, or failure to meet VOH/VOL specifications. For 3.3 V systems, consider the pin-compatible 74LVT540PW instead of the 74ABT540DB,118.
Is the 74ABT540DB,118 RoHS compliant?
Yes, the 74ABT540DB,118 is manufactured in accordance with EU RoHS Directive 2011/65/EU and subsequent amendments. As a legacy NXP part produced in modern facilities, it contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE above threshold limits - confirmed by NXP's official material declarations and Aetrix Electronics' traceable sourcing records for this 74ABT540DB,118 lot.
74ABT540DB,118 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-SSOP
74ABT540DB,118 FAQ
1.How can I place an order for 74ABT540DB,118 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT540DB,118 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 74ABT540DB,118 reliable?
The price and inventory of 74ABT540DB,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT540DB,118 is usually 5 days.
3.What payment methods are accepted for 74ABT540DB,118?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT540DB,118 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT540DB,118?
74ABT540DB,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT540DB,118 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 74ABT540DB,118?
For technical support, including 74ABT540DB,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT540DB,118 requirements.
6.How does Aetrix verify that 74ABT540DB,118 is sourced from the original manufacturer or authorized distributors?
All 74ABT540DB,118 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 74ABT540DB,118 meets industry standards.
7.What is the process for return or replacement of 74ABT540DB,118?
All 74ABT540DB,118 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT540DB,118, 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 74ABT540DB,118 part is unused and in its original packaging.
Return procedure for 74ABT540DB,118:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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