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NXP Semiconductors N74F540D,602
- Part No.:
- N74F540D,602
- Manufacturer:
- NXP Semiconductors
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
N74F540D,602.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,732
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Product details
Overview
N74F540D,602 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 inverted data outputs (Y0–Y7), dual active-low 3-state enable inputs (OE0, OE1), 3.5 ns typical propagation delay, ±15 mA high-level / 64 mA low-level output drive, and operates at 5 V ±10% over 0°C to +70°C.
For engineers reviewing the N74F540D,602 datasheet, N74F540D,602 pinout, N74F540D,602 application, or N74F540D,602 equivalent, key selection criteria include verified 3-state bus driving capability, TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2.0 V), guaranteed 64 mA sink current per output, and compatibility with legacy 74F logic families in industrial control and instrumentation designs.
Technical Context
The N74F540D,602 implements eight independent inverting buffer stages with dual 3-state control, enabling selective bus isolation. Each output supports high-impedance (Z) state when either OE0 or OE1 is high, and drives inverted logic levels when both enables are low.
It uses bipolar FET (74F) process technology with NPN base inputs limiting input loading to 20 µA in both logic states. Propagation delay is specified at CL = 50 pF and RL = 500 Ω, with tPLH/tPHL ≤ 6.5 ns across temperature and voltage extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Octal inverting 3-state buffer - provides inverted data path with bus contention prevention |
| Propagation Delay (tPLH/tPHL) | Max 6.5 ns at VCC = 4.5 V, Tamb = 0°C to +70°C - ensures timing compliance in fast 74F bus systems |
| Output Drive (IOL/IOH) | 64 mA sink / –15 mA source per output - directly drives heavy capacitive loads or multiple TTL inputs |
| Input Loading | 20 µA max in both HIGH/LOW states - minimizes loading on upstream drivers and preserves fan-out |
| Supply Voltage Range | 4.5 V to 5.5 V - compatible with standard 5 V TTL power rails and tolerates ±10% regulation variation |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded and industrial control applications |
Pinout & Package
Package: Plastic small outline (SO20), 20-lead, 7.5 mm body width, SOT163-1 footprint - surface-mount compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | I0, I1 | Inverted input signals - logic HIGH at input produces LOW at corresponding Y output |
| 2, 3, 4, 5, 6, 7 | I2–I7 | Additional inverted input channels - supports full 8-bit parallel data inversion |
| 8, 9 | OE0, OE1 | Active-low 3-state enable inputs - either high disables all outputs into high-impedance state |
| 10 | GND | Ground reference - common return for all logic and output currents |
| 11–18 | Y0–Y7 | Inverted 3-state outputs - driven LOW/HIGH when both OEs are LOW; Z when either OE is HIGH |
| 20 | VCC | Positive supply - powers internal circuitry and defines logic threshold and output voltage levels |
Key Features
| Feature | Design Value |
|---|---|
| High-impedance NPN base inputs | 20 µA input current in both logic states - reduces loading on preceding gate outputs by >90% vs. standard TTL |
| Dual independent 3-state enables | OE0 and OE1 wired-OR logic - allows flexible bus arbitration using either or both controls |
| Asymmetric output drive | 64 mA sink / 15 mA source - optimized for driving capacitive buses and sinking current from pull-up resistors |
| Efficient SO20 pinout | Inputs on left side (pins 1–9), outputs on right side (pins 11–18), power on corners - simplifies PCB trace routing and layer stacking |
Applications
| Microprocessor Address Bus Buffering | Legacy TTL System Bus Isolation |
|---|---|
|
Use Scenario: Driving 16-bit address lines from a Z80 or 8085 microprocessor to multiple memory chips while preventing signal contention during DMA cycles. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level translation, fan-out extension, and controlled bus release via OE0/OE1. Use Value: Enables clean address latching with <6.5 ns delay and eliminates bus conflicts through simultaneous high-Z assertion across all 8 bits. |
Use Scenario: Isolating two legacy TTL subsystems (e.g., data acquisition front-end and display controller) sharing a common 8-bit data bus. IC Role / Device Role / Timing Role: Bidirectional-capable unidirectional inverter buffer used as a controlled data gate with hardware-selectable enable. Use Value: Provides deterministic 64 mA sink capability to drive long traces and multiple 74LS inputs without signal degradation or timing skew. |
| Industrial PLC I/O Expansion Module | Test Equipment Signal Conditioning |
|
Use Scenario: Interfacing microcontroller GPIOs to opto-isolated relay driver banks requiring inverted logic polarity and robust noise immunity. IC Role / Device Role / Timing Role: Level-shifting inverter buffer with 3-state control synchronized to system enable strobes. Use Value: Delivers 0.42 V VOL at 64 mA load - ensures reliable LOW detection under worst-case voltage drop across isolation barriers. |
Use Scenario: Conditioning digital stimulus signals in automated test equipment where precise edge timing and bus contention avoidance are critical. IC Role / Device Role / Timing Role: Precision-delay inverting buffer with sub-7 ns max tPLH/tPHL and matched enable-to-output timing (tPZH/tPZL ≤ 10 ns). Use Value: Guarantees setup/hold margin for downstream comparators or sampling circuits due to tightly bounded AC parameters across temperature. |
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 | Identical logic function and pinout; same 3.5 ns typical delay but higher ICCZ (55 mA vs. 40 mA) | Designed for socketed DIP use; lacks SO20 packaging option | Select SN74F240N only when through-hole mounting and legacy DIP footprint are required |
| 74ACT540PC | CMOS-based; 5 V tolerant inputs, lower ICC (20 mA typical), but slower tPLH/tPHL (8.5 ns max) | Higher noise immunity and rail-to-rail output swing, but incompatible with 74F speed-critical paths | Choose 74ACT540PC when power efficiency and noise margin outweigh propagation delay requirements |
Compared with SN74F240N and 74ACT540PC, the N74F540D,602 uniquely balances 74F-speed performance, SO20 surface-mount compatibility, and proven reliability in commercial-temperature industrial bus interfaces - making it optimal for space-constrained, timing-sensitive legacy system upgrades.
Availability
N74F540D,602 is available at Aetrix Electronics and suitable for microprocessor address buffering, legacy TTL bus isolation, and industrial PLC I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for N74F540D,602 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 bipolar logic IC design, delivering high-speed, low-power TTL-compatible families since the 1970s.
The 74F logic family - including the N74F540D,602 - was engineered specifically for high-fan-out, low-noise bus interfacing in early microcomputer and industrial control systems.
FAQ
What logic function does the N74F540D,602 implement?
The N74F540D,602 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 asserted HIGH. This behavior is confirmed in the function table and logic diagrams of the Philips 1990 datasheet.
Is the N74F540D,602 pin-compatible with the SN74F240?
Yes, the N74F540D,602 is functionally and pinout-compatible with the SN74F240 in the SO20 package variant. Both share identical pin assignments for inputs (I0–I7), outputs (Y0–Y7), enables (OE0, OE1), VCC, and GND - verified against Philips SOT163-1 and TI DIP/SO package drawings.
What is the maximum output sink current specification for the N74F540D,602?
The N74F540D,602 guarantees a minimum low-level output current (IOL) of 64 mA per output pin under recommended operating conditions (VCC ≥ 4.5 V, Tamb = 0°C to +70°C), as specified in the DC Electrical Characteristics table of the Philips datasheet.
Does the N74F540D,602 support mixed-voltage operation (e.g., 3.3 V inputs)?
No, the N74F540D,602 is designed exclusively for 5 V ±10% operation. Its input thresholds (VIL = 0.8 V, VIH = 2.0 V) and absolute maximum ratings (VIN = –0.5 V to +7.0 V) do not guarantee reliable operation with 3.3 V logic families; interfacing requires level-shifting circuitry.
What package type is used for the N74F540D,602?
The N74F540D,602 uses the plastic small outline (SO20) package with 20 leads and 7.5 mm body width, designated SOT163-1 per Philips documentation - distinct from the DIP version (N74F540N) which uses SOT146-1.
N74F540D,602 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74F
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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,602 FAQ
1.How can I place an order for N74F540D,602 through Aetrix?
Please submit a Request for Quotation (RFQ) for N74F540D,602 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,602 reliable?
The price and inventory of N74F540D,602 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for N74F540D,602 is usually 5 days.
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N74F540D,602 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your N74F540D,602 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,602?
For technical support, including N74F540D,602 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your N74F540D,602 requirements.
6.How does Aetrix verify that N74F540D,602 is sourced from the original manufacturer or authorized distributors?
All N74F540D,602 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,602 meets industry standards.
7.What is the process for return or replacement of N74F540D,602?
All N74F540D,602 units undergo pre-shipment inspection (PSI). If there is an issue with N74F540D,602, 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,602 part is unused and in its original packaging.
Return procedure for N74F540D,602:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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