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Renesas 74HCT540FPV-E
- Part No.:
- 74HCT540FPV-E
- Manufacturer:
- Renesas
- Package:
- -
- Datasheet:
-
74HCT540FPV-E.pdf
- Description:
- IC BUFFER INVERT 5.5V
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
74HCT540FPV-E from Renesas Electronics is an octal inverting buffer with 3-state outputs, designed for bidirectional data bus interfacing and address/data latching in 5 V TTL-compatible digital systems. It features 8 independent inverting channels, dual 3-state enable inputs (G1/G2), 12 ns typical propagation delay at 50 pF load, ±6 mA output drive, and operates across 4.5–5.5 V supply with –40°C to +85°C industrial temperature range.
For engineers reviewing the 74HCT540FPV-E datasheet, 74HCT540FPV-E pinout, 74HCT540FPV-E application, or 74HCT540FPV-E equivalent, this device is selected for high-fanout bus driving, memory address buffering, and microcontroller peripheral interface isolation where logic inversion and precise 3-state control are required.
Technical Context
The 74HCT540FPV-E implements standard HCT logic with CMOS input characteristics and LSTTL-compatible output levels. Its dual NOR-gated 3-state control (G1 and G2) ensures all eight outputs enter high-impedance simultaneously when either enable is high - a critical feature for shared-bus arbitration.
It uses silicon-gate CMOS technology to achieve low static current (≤4 µA at 25°C) while maintaining robust noise immunity (VIH = 2.0 V min, VIL = 0.8 V max) and fast switching (tPLH/tPHL = 11–12 ns typ at VCC = 4.5 V, CL = 50 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Function | Inverting octal buffer with 3-state outputs - provides signal polarity inversion and bus contention prevention via high-impedance state. |
| Supply Voltage | 4.5–5.5 V - compatible with standard 5 V TTL/CMOS systems without level-shifting circuitry. |
| Propagation Delay | 12 ns typical (A→Y, CL = 50 pF) - enables reliable operation in 25 MHz+ synchronous bus environments. |
| Output Drive | ±6 mA (IOH/IOL) - supports fanout of 15 LSTTL loads, sufficient for driving multiple downstream ICs. |
| Input Thresholds | VIH ≥ 2.0 V, VIL ≤ 0.8 V - ensures robust noise margin (>0.4 V) against ground bounce and crosstalk in noisy PCB layouts. |
| Quiescent Current | ≤4 µA at 25°C - minimizes standby power in battery-backed or energy-sensitive control modules. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded applications including PLC I/O and motor control interfaces. |
Pinout & Package
SOP-20 package (JEITA standard PRSP0020DD-B, Renesas code FP-20DAV), 7.5 mm × 12.8 mm body, 1.27 mm pitch, Ni/Pd/Au-plated leads, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 (3-state enables) | NOR-gated dual enable: either high forces all Y outputs into high-Z - essential for multi-driver bus arbitration. |
| 2–9 | A1–A8 (inputs) | Inverting data inputs - each drives corresponding Y output with logic inversion (A1 → Y1 = NOT A1). |
| 11, 20 | GND, VCC | Power reference pins - require local 0.1 µF ceramic decoupling adjacent to pin 20 for stable high-speed switching. |
| 12–18, 10 | Y1–Y8 (outputs) | Active-low inverting outputs with 3-state capability - sink/source up to ±6 mA when enabled; high-Z when G1 or G2 high. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL Output Compatibility | VOH ≥ 4.13 V / VOL ≤ 0.33 V at 6 mA - directly replaces 74LS540 without pull-up resistors or level shifters. |
| Low Input Current | ≤1 µA max - eliminates loading concerns on upstream logic or microcontroller GPIO pins. |
| Wide Noise Margin | ΔVIN = 1.2 V (VIH–VIL) at VCC = 4.5 V - improves reliability in electrically noisy industrial enclosures. |
| Fast Enable/Disable Timing | tZH/tHZ ≤ 38 ns (max) - ensures clean bus release before next driver activates, preventing glitches during bus handoff. |
| ESD Protection | ≥2 kV HBM - meets IEC 61000-4-2 Level 2 for handling and board assembly in non-ESD-controlled environments. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Address Bus Buffering |
|---|---|
Use Scenario: Isolating and driving 8-bit parallel I/O expansion ports in programmable logic controllers under EMI-heavy factory floor conditions. IC Role / Device Role / Timing Role: Inverting buffer with 3-state control acts as direction-controlled data latch between CPU and isolated I/O modules. Use Value: Enables clean bidirectional data transfer using single 8-bit bus; dual enable inputs simplify timing-critical bus grant/release sequencing. |
Use Scenario: Buffering 8-bit address lines from an 8051-family microcontroller to external SRAM or EPROM memory devices. IC Role / Device Role / Timing Role: Inverting address driver that isolates MCU pins from memory bus capacitance while meeting strict tAA setup requirements. Use Value: 12 ns propagation delay ensures address valid time compliance; ±6 mA drive sustains signal integrity across 10 cm PCB traces. |
| Legacy ISA Bus Interface | Digital Panel Meter Data Latching |
Use Scenario: Interfacing modern microcontrollers to legacy ISA-compatible peripheral cards requiring inverted address/data strobes. IC Role / Device Role / Timing Role: Logic-level translator and bus driver providing inverted control signals (e.g., /IOR, /IOW) with precise 3-state timing. Use Value: Dual enable inputs synchronize with ISA bus grant cycles; high noise margin prevents false triggering from slot-edge coupling. |
Use Scenario: Capturing and holding 8-bit sensor readings (e.g., ADC output) for display on 7-segment LED panels in test equipment. IC Role / Device Role / Timing Role: Transparent latch buffer that freezes sampled data until display refresh cycle begins. Use Value: Low quiescent current (≤4 µA) extends battery life in portable meters; 3-state outputs allow multiplexed digit scanning without ghosting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer with 3-state applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT540N | DIP-20 package (not SOP); identical electrical specs and pinout except physical form factor. | Preferred for through-hole prototyping or legacy board rework where SOP reflow is unavailable. | Select when manual soldering or socket-based testing is required; no logic or timing change needed. |
| 74VHC540FT | Higher speed (tPD = 7.5 ns typ), wider VCC range (2–5.5 V), but lower output drive (±8 mA) and no LSTTL VOH compatibility. | Suitable for mixed-voltage 3.3 V/5 V systems but requires level-shifting if interfacing true LSTTL loads. | Choose only when operating below 4.5 V or needing sub-10 ns timing; verify VOH compatibility with downstream inputs. |
Compared with SN74HCT540N and 74VHC540FT, the 74HCT540FPV-E uniquely balances LSTTL output compatibility, industrial temperature range, and SOP-20 surface-mount packaging - making it optimal for volume-manufactured industrial controllers where pin-for-pin replacement of legacy DIP parts is unnecessary but board space and reflow compatibility are critical.
Availability
74HCT540FPV-E is available at Aetrix Electronics and suitable for industrial automation, test instrumentation, and legacy system upgrades requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for 74HCT540FPV-E 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and timing solutions for industrial, automotive, and infrastructure markets.
The HD74HCT540 product line was developed specifically for robust 5 V digital interfacing in industrial control and legacy system integration - emphasizing noise immunity, bus arbitration safety, and drop-in compatibility with TTL logic families.
FAQ
What is the logic function of the 74HCT540FPV-E?
The 74HCT540FPV-E is an octal inverting buffer with 3-state outputs. Each input (A1–A8) drives a corresponding inverted output (Y1–Y8), and both enable inputs (G1 and G2) operate as a NOR gate: if either is high, all outputs go high-impedance. This behavior is confirmed in the function table and pin description of the Renesas HD74HCT540 datasheet Rev.2.00.
Does the 74HCT540FPV-E support 3.3 V logic inputs?
No - the 74HCT540FPV-E is designed for 5 V operation only, with recommended VCC = 4.5–5.5 V. Its input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) are optimized for TTL-compatible signaling, not 3.3 V CMOS. Applying 3.3 V inputs may result in marginal or unreliable switching; level translation is required for mixed-voltage interfacing.
What is the maximum capacitive load the 74HCT540FPV-E can drive reliably?
The 74HCT540FPV-E is characterized up to 50 pF load (CL = 50 pF) in its switching specifications, with 12 ns typical propagation delay under those conditions. While it can drive higher capacitance, timing margins degrade beyond 50 pF - for >75 pF loads, derating or adding a repeater stage is advised per Renesas' application guidance in the HD74HCT540 datasheet.
Is the 74HCT540FPV-E pin-compatible with the 74HCT541FPV-E?
No - although both are SOP-20 octal buffers, the 74HCT540FPV-E is inverting while the 74HCT541FPV-E is non-inverting. Their pinouts are identical (same A1–A8, Y1–Y8, G1/G2, VCC/GND mapping), but logic polarity differs. Swapping them without adjusting upstream/downstream logic will invert functional behavior - verified by comparing their respective function tables in the Renesas HD74HCT540/541 datasheet.
What package type does the 74HCT540FPV-E use, and what are its key mechanical dimensions?
The 74HCT540FPV-E uses a SOP-20 package per JEITA standard PRSP0020DD-B (Renesas code FP-20DAV), measuring 7.5 mm × 12.8 mm with 1.27 mm lead pitch. Lead finish is Ni/Pd/Au, and mass is 0.31 g - full dimensions are specified on page 8 of the Renesas HD74HCT540 datasheet Rev.2.00.
74HCT540FPV-E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- 74HCT
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Buffer, Inverting
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
74HCT540FPV-E FAQ
1.How can I place an order for 74HCT540FPV-E through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT540FPV-E 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 74HCT540FPV-E reliable?
The price and inventory of 74HCT540FPV-E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT540FPV-E is usually 5 days.
3.What payment methods are accepted for 74HCT540FPV-E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT540FPV-E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT540FPV-E?
74HCT540FPV-E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT540FPV-E 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 74HCT540FPV-E?
For technical support, including 74HCT540FPV-E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT540FPV-E requirements.
6.How does Aetrix verify that 74HCT540FPV-E is sourced from the original manufacturer or authorized distributors?
All 74HCT540FPV-E 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 74HCT540FPV-E meets industry standards.
7.What is the process for return or replacement of 74HCT540FPV-E?
All 74HCT540FPV-E units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT540FPV-E, 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 74HCT540FPV-E part is unused and in its original packaging.
Return procedure for 74HCT540FPV-E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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