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NXP Semiconductors 74ABT540DB,112
- Part No.:
- 74ABT540DB,112
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74ABT540DB,112.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,393
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Product details
Overview
74ABT540DB,112 from NXP Semiconductors (formerly Philips) is an octal inverting 3-state buffer IC designed for high-speed bus interface applications. It features 8-bit inverting logic, ±64mA/–32mA output drive capability, 3.1ns typical propagation delay at 5V, and operates across –40°C to +85°C. It is used to isolate and drive data buses in industrial control backplanes and memory address latching circuits.
For engineers reviewing the 74ABT540DB,112 datasheet, 74ABT540DB,112 pinout, 74ABT540DB,112 application, or 74ABT540DB,112 equivalent, key selection criteria include 3-state enable timing (tPZH/tPHZ ≤ 6.4ns), BiCMOS-level drive strength, live insertion compatibility, and TSSOP-20 package thermal and layout advantages.
Technical Context
The 74ABT540DB,112 implements dual active-low output enables (OE0, OE1) controlling all eight inverted outputs simultaneously. Its BiCMOS architecture delivers low static current (ICCZ = 50µA) while sustaining high-speed switching (tPLH/tPHL = 4.3ns max) under 50pF load conditions.
It supports live insertion/extraction via latch-up protection (>500mA per JEDEC JC40.2) and ESD robustness (>2000V HBM, >200V MM). Input thresholds meet TTL-compatible levels (VIL = 0.8V, VIH = 2.0V), and power-up 3-state behavior prevents bus contention during supply ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with dual 3-state enables (OE0, OE1) |
| Propagation Delay | 4.3 ns max (An → Yn, CL = 50pF, VCC = 5.0V), enabling sub-230 MHz bus operation |
| Output Drive | +64 mA sink / –32 mA source, sufficient to drive multiple TTL loads or stubbed transmission lines |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5V logic rails and tolerant of ripple/noise |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and automation equipment |
| Input Capacitance | 3 pF - minimizes loading on upstream drivers and preserves signal integrity at high frequencies |
| 3-State Leakage | ±50 µA max (IOZL/IOZH) - ensures reliable high-impedance isolation during bus sharing |
Pinout & Package
74ABT540DB,112 is housed in a 20-pin plastic TSSOP (Thin Shrink Small Outline Package), Type I, body width 4.4 mm (SOT360-1), optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE0, OE1 | Dual active-low output enable inputs - both must be low for enabled (inverted) output; independent control not supported |
| 2–9 | A0–A7 | Inverting data inputs - logic high input yields logic low output; TTL-compatible voltage thresholds |
| 11–18 | Y0–Y7 | Inverted 3-state outputs - high-impedance when either OE is high; driven low/high only when both OEs are low |
| 10 | GND | Ground reference - dedicated pin for noise-sensitive return path; decoupling recommended adjacent to VCC |
| 20 | VCC | Positive supply - requires local 0.1 µF ceramic decoupling; supports 4.5–5.5 V operation |
Key Features
| Feature | Design Value |
|---|---|
| Live insertion/extraction support | Guaranteed by >500 mA latch-up immunity (JEDEC JC40.2), enabling hot-swap backplane modules without system reset |
| Efficient PCB layout pinout | Inputs (pins 2–9) and outputs (pins 11–18) placed on opposite sides - reduces trace crossovers and improves routing density |
| Power-up 3-state behavior | Outputs remain in high-impedance until VCC stabilizes above ~2.1 V - prevents bus contention during power sequencing |
| TTL-compatible input thresholds | VIL = 0.8 V max, VIH = 2.0 V min - ensures interoperability with legacy 5V microcontrollers, FPGAs, and ASICs |
| Low dynamic power consumption | Typical ICCZ = 50 µA in 3-state; ∆ICC = 0.5 µA per additional input at 3.4 V - extends system-level power budget headroom |
Applications
| Industrial Backplane Bus Driver | Memory Address Latch Interface |
|---|---|
Use Scenario: Driving parallel address/data buses across multi-slot industrial PLC backplanes with long trace runs and multiple receivers. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address lines from peripheral slots; enables time-multiplexed bus sharing between masters. Use Value: ±64mA drive strength maintains signal integrity over 15 cm FR4 traces; 4.3ns max tPLH supports 20+ MHz bus clocking without skew-induced setup violations. |
Use Scenario: Interfacing microcontroller address outputs to external SRAM or EPROM chips requiring inverted address strobes. IC Role / Device Role / Timing Role: Level-shifting and inverting address bits while providing bus contention protection during memory read/write transitions. Use Value: Dual OE inputs allow synchronized gating with memory control signals (e.g., RD/WR); power-up 3-state prevents spurious writes during boot. |
| Hot-Swappable I/O Module | Legacy System Logic Translation |
Use Scenario: Enabling field-replaceable I/O cards in modular automation controllers where cards may be inserted/removed while powered. IC Role / Device Role / Timing Role: Isolating module-local logic from shared backplane bus; provides controlled enable/disable during card insertion detection. Use Value: Live insertion rating and latch-up immunity (>500 mA) eliminate need for complex hot-swap controllers; simplifies mechanical design and firmware. |
Use Scenario: Bridging 5V TTL logic domains between aging industrial controllers and newer low-voltage peripherals. IC Role / Device Role / Timing Role: Signal inversion and drive boosting for interfacing 74LS-family outputs to modern 5V CMOS inputs with higher capacitive loads. Use Value: 3 pF input capacitance minimizes loading on legacy drivers; 7 pF output capacitance (disabled) avoids resonance with stubbed bus topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ABT540DBR | TI version in same TSSOP-20 (SOT360-1) package; identical AC/DC specs but different ESD rating (2000V HBM vs. 200V MM) | No functional difference in bus driving; TI part lacks explicit live insertion qualification language in datasheet | Select when sourcing from TI-authorized channels or requiring TI-specific compliance documentation |
| 74LVT540PW,118 | NXP 3.3V variant (SOT403-1, TSSOP-20); lower VCC range (2.7–3.6V), 3.5ns tPLH, ±32mA drive - not voltage-compatible with 5V systems | Requires level translation if interfacing with 5V buses; unsuitable as drop-in replacement without redesign | Choose only for new 3.3V-only designs prioritizing lower power and reduced EMI over 5V legacy compatibility |
Compared with SN74ABT540DBR and 74LVT540PW,118, the 74ABT540DB,112 uniquely combines 5V operation, live insertion certification, and BiCMOS drive strength in a space-efficient TSSOP package - making it the preferred choice for industrial backplane upgrades and mixed-voltage retrofit projects.
Availability
74ABT540DB,112 is available at Aetrix Electronics and suitable for industrial backplane bus drivers, memory address latch interfaces, hot-swappable I/O modules, and legacy system logic translation requiring stable component supply and long-term lifecycle assurance.
Supply support for 74ABT540DB,112 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 portfolio.
The 74ABT family was engineered for high-speed, low-power 5V bus interface applications in industrial control and telecommunications infrastructure - emphasizing robustness, timing precision, and compatibility with legacy TTL systems.
FAQ
What is the function of the dual output enable pins (OE0 and OE1) on the 74ABT540DB,112?
The 74ABT540DB,112 uses two active-low output enables (OE0 and OE1) that must both be asserted low to activate the inverting buffer outputs. If either OE is high, all eight outputs enter high-impedance state. This dual-enable structure provides redundancy and noise margin against false enable events, and is explicitly defined in the function table of the 74ABT540DB,112 datasheet.
Does the 74ABT540DB,112 support live insertion in backplane applications?
Yes, the 74ABT540DB,112 is qualified for live insertion/extraction per its latch-up protection rating (>500 mA per JEDEC JC40.2) and ESD robustness (>2000 V HBM). These specifications are confirmed in the official Philips/NXP product specification for the 74ABT540DB,112 and enable safe use in hot-pluggable industrial I/O modules without auxiliary protection circuitry.
What is the maximum operating frequency supported by the 74ABT540DB,112 when driving a 50 pF load?
With a 50 pF load and 5.0 V supply, the 74ABT540DB,112 exhibits a maximum propagation delay of 4.3 ns (tPLH/tPHL). This supports reliable operation up to approximately 230 MHz for single-edge signaling, assuming minimal interconnect delay - a value derived directly from the AC characteristics table in the 74ABT540DB,112 datasheet.
Can the 74ABT540DB,112 be used in a 3.3 V system?
No, the 74ABT540DB,112 is specified only for 4.5 V to 5.5 V operation per its Recommended Operating Conditions. Supplying 3.3 V violates the minimum VCC requirement and will result in undefined logic behavior and insufficient output drive. For 3.3 V systems, consider the pin-compatible 74LVT540PW,118 instead of the 74ABT540DB,112.
How does the power-up 3-state feature of the 74ABT540DB,112 prevent bus contention?
The 74ABT540DB,112 guarantees high-impedance outputs during power-up until VCC exceeds ~2.1 V, as verified in its DC electrical characteristics table (IPU/IPD parameter). This eliminates risk of conflicting drive states on shared buses during system startup - a critical reliability feature confirmed for the 74ABT540DB,112 in industrial control applications.
74ABT540DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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,112 FAQ
1.How can I place an order for 74ABT540DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT540DB,112 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,112 reliable?
The price and inventory of 74ABT540DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT540DB,112 is usually 5 days.
3.What payment methods are accepted for 74ABT540DB,112?
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4.How is shipping managed for 74ABT540DB,112?
74ABT540DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT540DB,112 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,112?
For technical support, including 74ABT540DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT540DB,112 requirements.
6.How does Aetrix verify that 74ABT540DB,112 is sourced from the original manufacturer or authorized distributors?
All 74ABT540DB,112 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,112 meets industry standards.
7.What is the process for return or replacement of 74ABT540DB,112?
All 74ABT540DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT540DB,112, 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,112 part is unused and in its original packaging.
Return procedure for 74ABT540DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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