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NXP Semiconductors N74F540D,623
- Part No.:
- N74F540D,623
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F540D,623.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,694
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Product details
Overview
N74F540D,623 from Philips Semiconductors is an octal inverting 3-state buffer IC designed for bus interface and memory address register buffering in TTL-compatible digital systems. It features 8 inverting data channels, 3-state outputs capable of sinking 64mA and sourcing 15mA, 3.5ns typical propagation delay at 5V, and operates across 0°C to +70°C commercial temperature range.
For engineers reviewing the N74F540D,623 datasheet, N74F540D,623 pinout, N74F540D,623 application, or N74F540D,623 equivalent, key selection criteria include its inverting logic function, dual active-low output enables (OE0/OE1), high-current 3-state drive capability, and compatibility with 20-pin SOIC (SOT163-1) layout constraints.
Technical Context
The N74F540D,623 implements eight independent inverting buffer stages, each with complementary output enable control via OE0 and OE1 - both active-low inputs that must be simultaneously low to activate outputs. Its TTL-compatible input structure draws only ±20µA in both logic states, minimizing bus loading.
Output drivers are optimized for capacitive bus driving: low-impedance pull-down (64mA sink) and moderate pull-up (15mA source) ensure fast edge rates into 50pF loads. Propagation delay is asymmetrically specified (tPLH/tPHL), reflecting inherent transistor-level asymmetry in the F-series bipolar implementation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting buffer with 3-state outputs |
| Propagation Delay (tPLH/tPHL) | Typical 3.5ns at VCC = 5V, CL = 50pF - enables sub-100MHz bus operation |
| Output Drive (IOL/IOH) | Sinks 64mA / sources 15mA - supports direct connection to multiple TTL loads without external buffers |
| Input Loading | 20µA max in both HIGH/LOW states - reduces fan-out burden on upstream logic |
| Supply Current (ICC) | 58mA typical total supply current - balances speed and power in dense bus interfaces |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded and industrial control applications |
| VCC Range | 4.5V to 5.5V - tolerates standard 5V rail variation without level-shifting |
Pinout & Package
Package: 20-lead plastic small outline (SOIC), SOT163-1, 7.5mm body width, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19–20 | I0–I7, VCC | Data inputs (inverting); positive supply rail - inputs placed opposite outputs to simplify PCB routing |
| 2–3, 18 | OE0, OE1, Y0 | Active-low 3-state enables; inverted output channel 0 - dual enables allow partial bus gating |
| 4–9, 11–17 | Y1–Y7, I1–I7, GND | Inverted outputs Y1–Y7; remaining inputs I1–I7; ground reference - symmetric pinout minimizes trace crossovers |
| 10 | GND | Ground reference - dedicated pin adjacent to VCC (Pin 20) for low-inductance decoupling |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state logic | Provides polarity-corrected bus isolation - essential for bidirectional address/data buses with master-slave arbitration |
| Dual active-low output enables | Enables hierarchical bus control - OE0 and OE1 can be driven by separate system signals for segmented access |
| High sink current (64mA) | Drives up to 16 standard TTL loads directly - eliminates need for external line drivers in legacy systems |
| Low input current (±20µA) | Reduces cumulative loading on clock or address drivers - critical for fan-out-limited microprocessor buses |
| Optimized SOIC pinout | Inputs and outputs segregated on opposing sides - simplifies 2-layer PCB layout with minimal vias |
Applications
| Microprocessor Address Bus Buffering | Legacy Memory Interface Isolation |
|---|---|
Use Scenario: Driving 16-bit address lines from a Z80 or 8086 CPU to multiple memory chips while preventing contention during DMA cycles. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing address signal integrity and bus turn-off timing control. Use Value: Dual OE inputs allow precise synchronization with CPU ALE and DMA acknowledge signals, eliminating address glitches during bus handoff. | Use Scenario: Isolating ROM/RAM address latches from shared data/address bus in industrial PLC backplanes. IC Role / Device Role / Timing Role: Octal inverter buffer enabling/disabling memory chip select paths based on I/O decode state. Use Value: 64mA sink capability ensures reliable low-level assertion across long backplane traces with >100pF capacitance. |
| Industrial Control Bus Transceiver | TTL-Level Signal Level Translation |
Use Scenario: Bidirectional bus conditioning between programmable logic controllers (PLCs) and sensor modules operating on shared 5V bus infrastructure. IC Role / Device Role / Timing Role: Direction-controlled inverting buffer managing signal flow and noise immunity on multi-drop control networks. Use Value: Asymmetric drive strength (64mA sink / 15mA source) matches typical TTL receiver input thresholds, reducing false triggering in noisy factory environments. | Use Scenario: Converting non-inverting logic outputs from CMOS peripherals to inverted TTL-compatible levels for legacy controller inputs. IC Role / Device Role / Timing Role: Level-shifting inverter buffer matching voltage thresholds and drive strength to 74F-series timing budgets. Use Value: 3.5ns propagation delay ensures setup/hold compliance with 25MHz microcontroller address strobes without added wait states. |
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 |
|---|---|---|---|
| SN74F240N | Same logic function and pinout; identical 3.5ns delay and 64mA sink, but packaged in 20-pin PDIP (SOT146-1) | Requires through-hole PCB assembly; lacks SOIC thermal and density advantages | Select when legacy through-hole manufacturing or socket-based prototyping is required |
| 74ACT540PC | CMOS version with 5V tolerance, lower ICC (4mA), faster tPLH (2.5ns), but only 24mA sink current | Not suitable for driving >8 TTL loads; requires careful VIH/VIL margin analysis in mixed-logic systems | Select when ultra-low power and higher noise immunity are prioritized over raw drive strength |
Compared with SN74F240N and 74ACT540PC, the N74F540D,623 uniquely combines SOIC packaging, full TTL drive strength, and proven reliability in commercial-temperature industrial bus interfaces - making it optimal where mechanical density and legacy compatibility coexist.
Availability
N74F540D,623 is available at Aetrix Electronics and suitable for microprocessor address buffering, legacy memory interface isolation, and industrial control bus transceiver applications requiring stable component supply and long-term obsolescence management.
Supply support for N74F540D,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
Philips Semiconductors (now NXP Semiconductors) is a pioneer in TTL and advanced logic families, delivering high-speed, low-power integrated circuits since the 1970s.
The 74F logic family - including the N74F540D,623 - was engineered specifically for high-frequency bus interfacing in microprocessor-based systems, emphasizing speed, drive strength, and layout efficiency in commercial-grade applications.
FAQ
What logic function does the N74F540D,623 implement?
The N74F540D,623 implements an octal inverting 3-state buffer function: each of its eight inputs (I0–I7) drives a corresponding inverted output (Y0–Y7), and all outputs enter high-impedance state when either OE0 or OE1 is high. This behavior is confirmed in the device's function table and logic diagrams within the Philips 1990 product specification.
Is the N74F540D,623 pin-compatible with the SN74F240N?
Yes, the N74F540D,623 is functionally and pinout-compatible with the SN74F240N - both share identical logic behavior, terminal assignments, and electrical specifications. The primary difference is package: N74F540D,623 uses SOIC (SOT163-1), while SN74F240N uses PDIP (SOT146-1). Pin mapping matches exactly per the Philips pin configuration diagram.
What is the maximum output sink current rating for the N74F540D,623?
The N74F540D,623 is rated for 64mA maximum low-level output current (IOL) per channel under recommended operating conditions (VCC = 4.5–5.5V, Tamb = 0°C to +70°C), as specified in the DC Electrical Characteristics table of the Philips datasheet. This value is validated across production lots and supports direct driving of multiple TTL inputs.
Does the N74F540D,623 support mixed-voltage operation?
No, the N74F540D,623 is specified only for 5V ±10% operation (4.5V to 5.5V). Its input thresholds (VIH = 2.0V min, VIL = 0.8V max) and output drive characteristics are optimized for TTL-compatible 5V systems. It does not support 3.3V or other supply voltages - attempting operation outside 4.5–5.5V violates Absolute Maximum Ratings and may cause permanent damage.
How are the output enable inputs OE0 and OE1 used in the N74F540D,623?
In the N74F540D,623, both OE0 and OE1 are active-low inputs; outputs Y0–Y7 go to high-impedance state if either is high, and become active (inverting) only when both are low. This dual-enable architecture allows flexible bus segmentation - for example, OE0 controlled by CPU and OE1 by DMA controller - ensuring no bus contention during resource handoff.
N74F540D,623 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- 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:
- 15mA, 64mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
N74F540D,623 FAQ
1.How can I place an order for N74F540D,623 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F540D,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 N74F540D,623 reliable?
The price and inventory of N74F540D,623 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F540D,623 is usually 5 days.
3.What payment methods are accepted for N74F540D,623?
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4.How is shipping managed for N74F540D,623?
N74F540D,623 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F540D,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 N74F540D,623?
For technical support, including N74F540D,623 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F540D,623 requirements.
6.How does Aetrix verify that N74F540D,623 is sourced from the original manufacturer or authorized distributors?
All N74F540D,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 N74F540D,623 meets industry standards.
7.What is the process for return or replacement of N74F540D,623?
All N74F540D,623 units undergo pre-shipment inspection (PSI). If there is an issue with N74F540D,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 N74F540D,623 part is unused and in its original packaging.
Return procedure for N74F540D,623:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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