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NXP Semiconductors 74ABT540D,623
- Part No.:
- 74ABT540D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74ABT540D,623.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,892
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Product details
Overview
74ABT540D,623 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 data path (A0–A7 → Y0–Y7), dual output enables (OE0/OE1), ±64mA/–32mA drive capability, 3.1ns typical propagation delay at 5V, and operates across –40°C to +85°C. It is used in address/data bus driving where controlled signal direction and high fan-out are required.
For engineers reviewing the 74ABT540D,623 datasheet, 74ABT540D,623 pinout, 74ABT540D,623 application, or 74ABT540D,623 equivalent, key selection criteria include 3-state output timing (tPZH/tPHZ ≤ 6.4ns), input/output voltage compatibility with 5V TTL/CMOS systems, dual-enable logic control, and SO20 package thermal and layout advantages.
Technical Context
The 74ABT540D,623 implements a BiCMOS architecture delivering low static current (ICCZ = 50µA in 3-state) while maintaining high-speed performance. Its dual independent output enables (OE0 and OE1) allow selective activation of two groups of outputs, supporting segmented bus control without external gating logic.
It supports live insertion/extraction and includes latch-up protection (>500mA per JEDEC JC40.2) and ESD robustness (>2000V HBM, >200V MM). The pinout places inputs (A0–A7) on one side and outputs (Y0–Y7) on the opposite side to minimize trace crosstalk on PCBs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with 3-state outputs; each Yn = NOT(An) when enabled |
| Propagation Delay (tPLH/tPHL) | 3.1ns typical at VCC = 5V, CL = 50pF - enables <30MHz bus operation |
| Output Drive | +64mA sink / –32mA source - drives heavy capacitive loads or multiple TTL inputs |
| Supply Voltage Range | 4.5V to 5.5V - compatible with regulated 5V systems; rejects ripple up to ±0.5V |
| Input Capacitance (CIN) | 3pF - minimizes loading on upstream drivers and preserves signal edge integrity |
| 3-State Leakage (IOZL/IOZH) | ±50µA max - ensures clean high-impedance state during bus sharing |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and computing environments |
Pinout & Package
74ABT540D,623 is housed in a 20-pin plastic small outline package (SO20, SOT163-1), 7.5 mm body width, surface-mount compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE0, OE1 | Dual active-low output enable controls; both must be LOW to activate outputs |
| 2–9 | A0–A7 | Inverting data inputs; logic HIGH yields LOW output when enabled |
| 11–18 | Y0–Y7 | Inverting buffered outputs; enter high-impedance (Z) when either OE is HIGH |
| 10 | GND | Ground reference for all I/O and internal circuitry |
| 20 | VCC | +5V supply rail; decoupling capacitor required near pin for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Live insertion/extraction support | Enables hot-swap capability in backplane or modular systems without power cycling |
| Efficient pinout layout | Inputs on left, outputs on right - reduces layer count and crosstalk in dense PCB routing |
| Power-up 3-state behavior | Outputs remain in high-impedance until VCC stabilizes, preventing bus contention at power-on |
| Latch-up immunity | Exceeds 500mA per JEDEC JC40.2 - withstands transient overcurrent events in noisy environments |
| ESD protection | 2000V HBM, 200V MM - meets industrial handling requirements without additional protection circuitry |
Applications
| Memory Address Bus Driver | Microprocessor Data Bus Isolator |
|---|---|
Use Scenario: Driving 16-bit address lines from a microcontroller to multiple SRAM/ROM chips in a shared-memory system. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control isolates address bus segments during DMA cycles or peripheral access. Use Value: Dual OE pins allow independent enabling of upper/lower address byte groups; ±64mA drive ensures signal integrity across 10+ cm traces. |
Use Scenario: Bidirectional data bus isolation between an 8051 MCU and external peripherals (ADC, display controller). IC Role / Device Role / Timing Role: Provides direction-controlled, inverting data path with precise tPZH/tPHZ timing to synchronize with CPU strobes. Use Value: 3.1ns propagation delay and sub-5ns enable/disable times meet tight 8051 read/write cycle timing budgets. |
| Industrial PLC I/O Expansion Module | Legacy ISA Bus Interface Adapter |
Use Scenario: Interfacing field I/O signals to a central controller via opto-isolated backplane with limited drive strength. IC Role / Device Role / Timing Role: Buffers and inverts digital status signals while providing noise-immune 3-state control for multiplexed diagnostics. Use Value: –40°C to +85°C rating and latch-up protection ensure reliability in uncontrolled cabinet environments. |
Use Scenario: Adapting modern logic-level peripherals to legacy ISA bus timing and voltage domains. IC Role / Device Role / Timing Role: Acts as level-shifting inverting buffer with precise 3-state timing to match ISA bus turnaround requirements. Use Value: SO20 footprint allows compact integration into retro-computing add-in cards without redesigning board layout. |
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 DIP-20 package only; no SO20 variant available | Requires through-hole assembly; unsuitable for space-constrained SMT designs | Select when legacy DIP layout or socketing is mandatory |
| 74LVT540PW,118 | Lower VCC range (2.7–3.6V); 3.3V-only operation; 2.8ns typical tPLH; not 5V-tolerant | Designed for 3.3V systems; incompatible with 5V buses without level translation | Select only for new 3.3V designs requiring lower power and faster speed |
Compared with SN74ABT240N and 74LVT540PW,118, the 74ABT540D,623 uniquely combines 5V operation, SO20 packaging, and dual OE control in a single industrial-qualified device - making it optimal for upgrading legacy 5V bus interfaces with surface-mount manufacturing.
Availability
74ABT540D,623 is available at Aetrix Electronics and suitable for industrial control systems, legacy computing upgrades, and embedded bus expansion modules requiring stable component supply and long-term obsolescence management.
Supply support for 74ABT540D,623 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 IC development.
The 74ABT540D,623 belongs to NXP's ABT-series advanced BiCMOS logic family, engineered specifically for high-speed, high-drive 5V bus interfacing in industrial and computing infrastructure where reliability and timing precision are critical.
FAQ
What is the operating voltage range for the 74ABT540D,623?
The 74ABT540D,623 operates within a recommended DC supply voltage range of 4.5V to 5.5V. Absolute maximum VCC is +7.0V, but sustained operation outside the 4.5–5.5V window may compromise timing accuracy, output drive, or long-term reliability. All AC and DC specifications in the datasheet are validated at VCC = 5.0V ±0.5V.
Does the 74ABT540D,623 support hot-plug or live insertion?
Yes, the 74ABT540D,623 explicitly supports live insertion and extraction per its product specification. This capability is enabled by its BiCMOS design, power-up 3-state behavior, and robust ESD/latch-up protection - allowing safe connection/disconnection in powered-backplane systems without disrupting bus operation.
How does the dual output enable (OE0/OE1) function in the 74ABT540D,623?
In the 74ABT540D,623, both OE0 and OE1 must be driven LOW simultaneously to enable all eight outputs (Y0–Y7). If either OE is HIGH, all outputs enter high-impedance (Z) state. This dual-input structure provides redundancy and noise margin - unlike single-OE variants - and prevents accidental bus activation due to floating or glitched enable lines.
What is the maximum capacitive load the 74ABT540D,623 can drive reliably?
The 74ABT540D,623 is characterized with CL = 50pF for AC timing (e.g., 3.1ns tPLH), and its ±64mA/–32mA output drive supports heavier loads. While not explicitly rated beyond 50pF in timing tables, real-world use confirms stable operation into ≥100pF with minor delay increase - provided proper VCC decoupling and trace impedance control are implemented.
Is the 74ABT540D,623 pin-compatible with other 74-series octal buffers like the 74LS540?
No, the 74ABT540D,623 is not pin-compatible with 74LS540. Although both are 20-pin octal inverting 3-state buffers, the 74ABT540D,623 uses a different pin configuration: OE0/OE1 are on pins 1/19, whereas 74LS540 uses a single OE on pin 1. Signal pin assignments (A0–A7, Y0–Y7) also differ - direct replacement requires PCB redesign.
74ABT540D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74ABT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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-SO
74ABT540D,623 FAQ
1.How can I place an order for 74ABT540D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74ABT540D,623 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 74ABT540D,623 reliable?
The price and inventory of 74ABT540D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74ABT540D,623 is usually 5 days.
3.What payment methods are accepted for 74ABT540D,623?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74ABT540D,623 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74ABT540D,623?
74ABT540D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74ABT540D,623 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 74ABT540D,623?
For technical support, including 74ABT540D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74ABT540D,623 requirements.
6.How does Aetrix verify that 74ABT540D,623 is sourced from the original manufacturer or authorized distributors?
All 74ABT540D,623 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 74ABT540D,623 meets industry standards.
7.What is the process for return or replacement of 74ABT540D,623?
All 74ABT540D,623 units undergo pre-shipment inspection (PSI). If there is an issue with 74ABT540D,623, 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 74ABT540D,623 part is unused and in its original packaging.
Return procedure for 74ABT540D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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