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Toshiba Semiconductor and Storage TC74LCX540F(EL,K,F

Name: TC74LCX540F(EL,K,F
Brand: Toshiba Semiconductor and Storage
SKU: TC74LCX540F(EL,K,F
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC74LCX540F(EL,K,F

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Buffers, Drivers, Receivers, Transceivers

Package:: 20-SOIC (0.209", 5.30mm Width)

Datasheet:: TC74LCX540F(EL,K,F.pdf

Description:: IC BUFFER INVERT 3.6V 20SOP

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Product details

Overview

TC74LCX540F(EL,K,F) from Toshiba Electronic Devices & Storage Corporation is an inverting 3-state octal bus buffer designed for 3.3-V logic systems with 5-V tolerant inputs and outputs. It delivers 6.5 ns max propagation delay at VCC = 3.3 V, ±24 mA output drive, and operates across 1.65–3.6 V supply range - enabling voltage-level translation between 3.3-V controllers and legacy 5-V peripherals in memory address/data bus interfaces.

For engineers reviewing the TC74LCX540F(EL,K,F) datasheet, TC74LCX540F(EL,K,F) pinout, TC74LCX540F(EL,K,F) application, or TC74LCX540F(EL,K,F) equivalent, key selection criteria include dual active-low output enables, high-impedance state control timing (tpZL/tpZH ≤ 8.5 ns), 5-V tolerance without external level shifters, and JEITA SOP-20 package compatibility with legacy 74-series footprints.

Technical Context

The TC74LCX540F(EL,K,F) implements a CMOS-based inverting buffer architecture with two independent active-low output enable inputs (1OE, 2OE), allowing selective tri-state control of two 4-bit groups (A1–A4 and A5–A8). Its 5-V tolerant I/Os use robust input protection circuits and power-down leakage suppression (IOFF ≤ 10 µA).

AC performance is characterized across VCC = 1.8–3.6 V, with propagation delay (tpLH/tpHL) guaranteed to 6.5 ns max at 3.3 V and output skew (tosLH/tosHL) ≤ 1.0 ns - ensuring tight timing alignment across all eight buffered channels in high-speed address latching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
VCC Range	1.65–3.6 V: Enables operation in modern low-voltage systems while maintaining backward compatibility with 5-V signal domains.
Propagation Delay	6.5 ns max (VCC = 3.3 V): Supports >100 MHz address/data bus toggling in memory interface designs.
Output Drive	±24 mA (VCC = 3.0 V): Sufficient to drive multiple TTL loads or long PCB traces without external buffers.
I/O Voltage Tolerance	0–5.5 V input/output: Allows direct connection to 5-V buses without level-shifting components.
Quiescent ICC	≤10 µA: Minimizes standby power in battery-backed or energy-sensitive embedded systems.
Input Capacitance	7 pF (VCC = 3.3 V): Reduces capacitive loading on upstream drivers, preserving signal integrity at high frequencies.

Pinout & Package

TC74LCX540F(EL,K,F) is packaged in JEITA-standard SOP-20 (SOP20-P-300-1.27A), 1.27 mm pitch, surface-mount plastic package with 0.22 g typical weight.

Pin/Terminal	Circuit Role	Design Meaning
1, 19	1OE, 2OE	Active-low output enable controls for A1–A4 and A5–A8 groups respectively; both must be low for valid output states.
2–9	A1–A8	Inverting data inputs; each drives corresponding inverted output (Y1–Y8) when respective OE is asserted.
11–18	Y1–Y8	Inverted buffered outputs; enter high-impedance state when either OE is high.
10	GND	Ground reference for all internal circuitry and I/O signaling.
20	VCC	Primary power supply (1.65–3.6 V); powers internal logic and output drivers.

Key Features

Feature	Design Value
5-V tolerant I/Os	Supports mixed-voltage system interfacing without external level translators - reduces BOM count and layout complexity.
Dual independent output enables	Enables partitioned bus control: e.g., separate enable for lower/upper address nibbles in memory-mapped peripherals.
Low dynamic power dissipation	CPD = 40 pF at 3.3 V enables predictable ICC(opr) calculation (ICC = CPD × VCC × fIN + ICC/8), simplifying thermal design.
ESD-protected inputs	Integrated input protection circuits withstand ≥2 kV HBM, improving board-level robustness during handling and operation.
Pin-compatible with 74-series 540	Direct drop-in replacement for legacy 74AC/VHC/HC/F/ALS/LS 540 devices in existing SOP-20 layouts - no PCB revision required.

Applications

Memory Address Buffering	Industrial PLC I/O Expansion
Use Scenario: Driving 3.3-V microcontroller address bus to 5-V SRAM or EPROM chips in industrial control modules. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level translation and bus isolation during memory read/write cycles. Use Value: Eliminates need for discrete level shifters while maintaining <6.5 ns propagation delay - preserves timing margins in 20+ ns memory access windows.	Use Scenario: Interfacing 3.3-V FPGA I/O banks to legacy 5-V digital input modules in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer isolating FPGA logic from noisy industrial field-side signals. Use Value: 5-V tolerant inputs accept direct connection to 24-V optocoupler outputs (via resistive divider), reducing component count per channel.
Automotive Body Control Unit	Test Equipment Signal Conditioning
Use Scenario: Isolating 3.3-V CAN controller address/data lines from 5-V diagnostic port peripherals in body control ECUs. IC Role / Device Role / Timing Role: Controlled-tri-state buffer enabling shared bus arbitration between microcontroller and external test/debug interfaces. Use Value: Dual OE pins allow synchronized disable of two 4-bit segments - prevents bus contention during firmware updates via JTAG/SWD.	Use Scenario: Level-shifting and buffering digital stimulus signals from 3.3-V pattern generators to 5-V DUT inputs in automated test equipment. IC Role / Device Role / Timing Role: High-speed inverting buffer with precise enable timing (tpZH ≤ 8.5 ns) for synchronized signal gating. Use Value: Low output skew (<1.0 ns) ensures simultaneous edge transitions across all 8 outputs - critical for parallel vector testing accuracy.

Memory Address Buffering

Industrial PLC I/O Expansion

Use Scenario: Driving 3.3-V microcontroller address bus to 5-V SRAM or EPROM chips in industrial control modules.

IC Role / Device Role / Timing Role: Inverting 3-state buffer providing level translation and bus isolation during memory read/write cycles.

Use Value: Eliminates need for discrete level shifters while maintaining <6.5 ns propagation delay - preserves timing margins in 20+ ns memory access windows.

Use Scenario: Interfacing 3.3-V FPGA I/O banks to legacy 5-V digital input modules in programmable logic controller backplanes.

IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant buffer isolating FPGA logic from noisy industrial field-side signals.

Use Value: 5-V tolerant inputs accept direct connection to 24-V optocoupler outputs (via resistive divider), reducing component count per channel.

Automotive Body Control Unit

Test Equipment Signal Conditioning

Use Scenario: Isolating 3.3-V CAN controller address/data lines from 5-V diagnostic port peripherals in body control ECUs.

IC Role / Device Role / Timing Role: Controlled-tri-state buffer enabling shared bus arbitration between microcontroller and external test/debug interfaces.

Use Value: Dual OE pins allow synchronized disable of two 4-bit segments - prevents bus contention during firmware updates via JTAG/SWD.

Use Scenario: Level-shifting and buffering digital stimulus signals from 3.3-V pattern generators to 5-V DUT inputs in automated test equipment.

IC Role / Device Role / Timing Role: High-speed inverting buffer with precise enable timing (tpZH ≤ 8.5 ns) for synchronized signal gating.

Use Value: Low output skew (<1.0 ns) ensures simultaneous edge transitions across all 8 outputs - critical for parallel vector testing accuracy.

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal inverting buffer applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
74LVC541APW	Non-inverting output polarity; identical VCC range (1.65–3.6 V), 5-V tolerant I/Os, and SOP-20 package.	Requires logic inversion in upstream firmware or external gate if inverting function is mandatory.	Select when non-inverting behavior aligns with system-level signal flow and board layout rework is acceptable.
SN74LVTH540PW	Higher drive strength (±32 mA), but requires minimum VCC = 2.7 V and lacks 1.65 V operation; same SOP-20 footprint.	Suitable only in 2.7–3.6 V systems where extra drive margin is needed for long traces or heavy capacitive loads.	Choose when driving >15 pF per line or >10 TTL loads - otherwise TC74LCX540F(EL,K,F) offers broader voltage flexibility.

Compared with 74LVC541APW and SN74LVTH540PW, TC74LCX540F(EL,K,F) uniquely supports 1.65 V operation and provides true inverting functionality in a pin-compatible 74-series package - making it optimal for low-voltage legacy interface upgrades requiring minimal firmware or hardware changes.

Availability

TC74LCX540F(EL,K,F) is available at Aetrix Electronics and suitable for memory interface buffering, industrial I/O expansion, and automotive body control unit designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TC74LCX540F(EL,K,F) 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

Toshiba Electronic Devices & Storage Corporation is a global semiconductor manufacturer specializing in power devices, logic ICs, and storage solutions, with decades of expertise in CMOS process technology and industrial-grade reliability.

The TC74LCX540F(EL,K,F) belongs to Toshiba's LCX low-voltage CMOS logic family, engineered for seamless voltage translation between 3.3-V logic and 5-V legacy systems in cost-sensitive, high-volume industrial and automotive applications.

FAQ

What is the operating voltage range for TC74LCX540F(EL,K,F)?

The TC74LCX540F(EL,K,F) operates over a VCC range of 1.65 V to 3.6 V, supporting low-power 1.8-V and standard 3.3-V systems. Its inputs and outputs tolerate 0–5.5 V regardless of VCC, enabling reliable interfacing with 5-V peripherals without external level shifters - a key capability confirmed in Toshiba's Electrical Characteristics table for VIN/VOUT.

Does TC74LCX540F(EL,K,F) support true 3-state operation?

Yes, TC74LCX540F(EL,K,F) provides full 3-state output control via two active-low enable inputs (1OE and 2OE). When either enable is high, the corresponding four outputs (Y1–Y4 or Y5–Y8) enter high-impedance mode - verified by the Truth Table and AC timing parameters tpZL/tpZH in the official Toshiba datasheet. This allows safe bus sharing in multi-driver configurations.

Is TC74LCX540F(EL,K,F) pin-compatible with standard 74-series devices?

Yes, TC74LCX540F(EL,K,F) is explicitly documented as pin- and function-compatible with 74AC/VHC/HC/F/ALS/LS 540-type octal inverters in SOP-20 packages. The Pin Assignment diagram matches standard 74540 pinouts, and Toshiba confirms mechanical and electrical interoperability - enabling drop-in replacement in legacy designs without PCB modification.

What is the maximum propagation delay of TC74LCX540F(EL,K,F) at 3.3 V?

The maximum propagation delay (tpLH/tpHL) for TC74LCX540F(EL,K,F) is 6.5 ns at VCC = 3.3 V ± 0.3 V, as specified in the AC Characteristics table under "Propagation delay time". This value is measured under standard load conditions (CL = 50 pF, RL = 500 Ω) and guarantees timing compliance in high-speed address/data bus applications up to ~100 MHz.

How does TC74LCX540F(EL,K,F) handle unused inputs?

Toshiba specifies that all unused inputs on TC74LCX540F(EL,K,F) must be tied to either VCC or GND to prevent floating nodes, which could cause excessive current draw or erratic switching. This requirement is stated in the Operating Ranges note and enforced by internal input protection circuitry - failure to comply risks increased ICC and potential device malfunction.

TC74LCX540F(EL,K,F Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: 74LCX

Package/Case:: 20-SOIC (0.209", 5.30mm Width)

Packaging:: Tape & Reel (TR)

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:: 24mA, 24mA

Voltage - Supply:: 1.65V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 20-SOP

TC74LCX540F(EL,K,F FAQ

1.How can I place an order for TC74LCX540F(EL,K,F through Aetrix?

Please submit a Request for Quotation (RFQ) for TC74LCX540F(EL,K,F 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 TC74LCX540F(EL,K,F reliable?

The price and inventory of TC74LCX540F(EL,K,F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX540F(EL,K,F is usually 5 days.

3.What payment methods are accepted for TC74LCX540F(EL,K,F?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX540F(EL,K,F transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC74LCX540F(EL,K,F?

TC74LCX540F(EL,K,F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC74LCX540F(EL,K,F 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 TC74LCX540F(EL,K,F?

For technical support, including TC74LCX540F(EL,K,F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX540F(EL,K,F requirements.

6.How does Aetrix verify that TC74LCX540F(EL,K,F is sourced from the original manufacturer or authorized distributors?

All TC74LCX540F(EL,K,F 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 TC74LCX540F(EL,K,F meets industry standards.

7.What is the process for return or replacement of TC74LCX540F(EL,K,F?

All TC74LCX540F(EL,K,F units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX540F(EL,K,F, 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 TC74LCX540F(EL,K,F part is unused and in its original packaging.

Return procedure for TC74LCX540F(EL,K,F:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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