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Toshiba Semiconductor and Storage TC74LCX540FT(EL)
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- Part No.:
- TC74LCX540FT(EL)
- Manufacturer:
- Toshiba Semiconductor and Storage
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TC74LCX540FT(EL).pdf
- Description:
- IC INVERTER 8-INPUT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,934
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Product details
Overview
TC74LCX540FT(EL) from Toshiba Electronic Devices & Storage Corporation is an inverting 3-state octal bus buffer optimized for 3.3-V systems with 5-V tolerant inputs and outputs. It features dual active-low output enables, 6.5 ns max propagation delay at 3.3 V, ±24 mA output drive, and operates across 1.65–3.6 V supply range. Used in memory address driving and mixed-voltage bus interfacing.
For engineers reviewing the TC74LCX540FT(EL) datasheet, TC74LCX540FT(EL) pinout, TC74LCX540FT(EL) application, or TC74LCX540FT(EL) equivalent, key selection criteria include 3.3-V core compatibility, 5-V I/O tolerance, dual OE control, high-speed 3-state switching, and JEITA SOP-20 package footprint.
Technical Context
The TC74LCX540FT(EL) implements a CMOS-based inverting buffer architecture with two independent active-low output enable inputs (1OE, 2OE), allowing selective 3-state control of two 4-bit groups (A1–A4 and A5–A8). Its input and output stages are designed with robust protection against static discharge and power-down leakage.
It supports mixed-voltage system interfacing by accepting 0–5.5 V input signals while powered from 1.65–3.6 V VCC, and delivering compatible 0–5.5 V output swing. Propagation delay (tpLH/tpHL) and output enable/disable timing are fully characterized across VCC = 1.8 V to 3.3 V, with skew ≤1.0 ns between outputs at 3.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 1.65–3.6 V: Enables direct integration into 3.3-V logic domains without level-shifting circuitry. |
| Propagation Delay | 6.5 ns max at VCC = 3.3 V: Supports >100 MHz bus operation in address/data path applications. |
| Output Drive | ±24 mA at VCC = 3.0 V: Sufficient to drive 50-Ω transmission lines or fan-out to ≥10 LVTTL loads. |
| I/O Voltage Tolerance | 0–5.5 V input/output range: Allows safe connection to 5-V peripherals without external clamping or resistors. |
| 3-State Enable Timing | tpZL/tpZH = 8.5 ns max at 3.3 V: Ensures clean bus arbitration with minimal contention window during direction switching. |
| Input Capacitance | 7 pF typical: Minimizes signal loading on upstream drivers and preserves edge integrity in high-speed buses. |
| Quiescent ICC | ≤10 µA: Reduces standby power in battery-backed or low-power embedded subsystems. |
Pinout & Package
TC74LCX540FT(EL) is supplied in JEITA-standard SOP-20 (Small Outline Package, 20-pin, 1.27 mm pitch), designated SOP20-P-300-1.27A, with typical weight 0.22 g.
| 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. |
| 2–9, 11–18 | A1–A8, Y1–Y8 | Inverting data path: Yn = NOT(An); pins 2–9 = inputs A1–A8, pins 11–18 = outputs Y1–Y8 (Y1=A1̅, etc.). |
| 10 | GND | Ground reference for all internal logic and I/O stages; requires low-impedance PCB connection. |
| 20 | VCC | Primary power supply (1.65–3.6 V); decoupling capacitor (0.1 µF ceramic) required adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| 5-V tolerant I/O | Enables seamless interface between 3.3-V logic and legacy 5-V peripherals without external voltage translators. |
| Dual independent OE control | Allows partitioned bus management-e.g., separate control of address vs. data lanes or memory bank selection. |
| Low dynamic power dissipation | CPD = 40 pF at 3.3 V enables predictable current consumption (ICC ≈ CPD × VCC × fIN) for thermal design. |
| ESD-protected inputs | Integrated protection circuits withstand ≥2 kV HBM, reducing need for external TVS diodes in industrial environments. |
| Pin-compatible with 74-series 540 | Direct drop-in replacement for 74AC/VHC/HC/F/ALS/LS 540 devices in existing designs using SOP-20 footprints. |
Applications
| Memory Address Buffering | Industrial PLC Backplane Interface |
|---|---|
Use Scenario: Driving 32-bit address bus from a 3.3-V microcontroller to multiple 5-V SRAM/ROM chips in a programmable logic controller. IC Role / Device Role / Timing Role: Inverting 3-state octal buffer providing level translation, bus isolation, and timing-controlled enable sequencing. Use Value: Eliminates discrete level shifters; 6.5 ns delay ensures setup/hold compliance with 5-V memory access cycles up to 80 MHz. | Use Scenario: Interfacing a 3.3-V FPGA I/O bank to legacy 5-V I/O modules on a modular automation backplane. IC Role / Device Role / Timing Role: Bidirectional voltage-tolerant bus buffer enabling hot-swap-safe communication with 5-V fieldbus nodes. Use Value: Dual OE allows per-module enable/disable without affecting other slots; 5-V tolerance prevents damage during insertion/removal. |
| Embedded System Power Sequencing | Test Equipment Signal Conditioning |
Use Scenario: Isolating boot ROM address lines during CPU reset in a low-power medical device with staggered 3.3-V/5-V rail startup. IC Role / Device Role / Timing Role: Controlled 3-state gate preventing bus contention during power-up/down transitions. Use Value: Power-down leakage <10 µA avoids unintended current paths; OE-controlled disable aligns with reset assertion timing. | Use Scenario: Conditioning digital stimulus signals from a 3.3-V pattern generator before injection into 5-V DUTs in automated test equipment. IC Role / Device Role / Timing Role: High-fidelity inverting buffer preserving signal edge rate and minimizing jitter via low CIN/COUT. Use Value: 7 pF input capacitance maintains >1 ns edge fidelity; 1.0 ns output skew ensures multi-channel timing alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC540APW,118 | Same 3.3-V VCC range and 5-V tolerant I/O, but uses different pinout (TSSOP-20) and has single OE (not dual). | Lacks independent control of two 4-bit groups; unsuitable where split-bus enable is required. | Select when board space is constrained and dual OE is unnecessary; verify PCB layout compatibility. |
| SN74LVCH16540ADGGR | 16-bit (dual-octal), 3.3-V only (no 5-V tolerance), LVCMOS input thresholds, different package (TSSOP-48). | Cannot interface directly to 5-V systems; requires external level shifting for legacy peripheral support. | Choose for higher-density 16-bit buffering in pure 3.3-V systems where footprint and channel count outweigh voltage flexibility. |
Compared with 74LVC540APW,118 and SN74LVCH16540ADGGR, the TC74LCX540FT(EL) uniquely combines dual active-low OE control, guaranteed 5-V I/O tolerance, and JEITA SOP-20 compatibility-making it optimal for retrofitting legacy 74-series designs with low-voltage operation and mixed-voltage robustness.
Availability
TC74LCX540FT(EL) is available at Aetrix Electronics and suitable for memory address buffering, industrial PLC backplane interfaces, embedded power sequencing, test equipment signal conditioning, and mixed-voltage bus isolation requiring stable component supply and long-term lifecycle support.
Supply support for TC74LCX540FT(EL) 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 experience in high-reliability industrial and automotive components.
The TC74LCX series targets low-voltage, high-speed logic interfacing in mixed-supply systems-designed specifically to replace legacy 74-series buffers while maintaining pinout compatibility and extending voltage tolerance beyond standard LVCMOS.
FAQ
What is the maximum operating frequency supported by the TC74LCX540FT(EL)?
The TC74LCX540FT(EL) does not specify a maximum clock frequency directly, but its 6.5 ns max propagation delay at 3.3 V implies reliable operation in bus systems with cycle times ≥13 ns (i.e., up to ~77 MHz for round-trip signaling). Actual usable frequency depends on load capacitance, trace routing, and system timing margins-notably, output-to-output skew remains ≤1.0 ns at 3.3 V, supporting synchronized multi-bit transfers in the TC74LCX540FT(EL).
Does the TC74LCX540FT(EL) require external pull-up or pull-down resistors on its OE pins?
No, the TC74LCX540FT(EL) OE inputs are CMOS-compatible with rail-to-rail logic thresholds and do not require external biasing. However, unused OE pins must be tied to either VCC or GND to prevent floating states that could cause undefined output behavior. The TC74LCX540FT(EL) datasheet explicitly mandates this practice to ensure deterministic 3-state control and avoid increased ICC or noise susceptibility.
Can the TC74LCX540FT(EL) safely drive a 50-Ω transmission line?
Yes-the TC74LCX540FT(EL) delivers ±24 mA output current at 3.0 V, sufficient to drive a 50-Ω line terminated at VCC/2 (requiring ~33 mA peak for full swing). While not a dedicated line driver, its output stage supports controlled-edge signaling into moderate-impedance loads. For best signal integrity with the TC74LCX540FT(EL), use series termination near the source and keep trace lengths under 15 cm at >50 MHz.
Is the TC74LCX540FT(EL) RoHS compliant and lead-free?
Yes, the TC74LCX540FT(EL) is RoHS compliant and lead-free. The "(EL)" suffix in the part number denotes Toshiba's lead-free, halogen-free packaging per JEDEC J-STD-020 and EU RoHS Directive 2011/65/EU. The device uses matte tin plating on SOP-20 leads and meets reflow profile requirements up to 260°C peak temperature, as confirmed in Toshiba's official environmental compliance documentation for the TC74LCX540FT(EL).
How does the TC74LCX540FT(EL) handle power-down conditions when VCC = 0 V?
When VCC = 0 V, the TC74LCX540FT(EL) exhibits power-off protection: input and output terminals tolerate up to 5.5 V while drawing ≤10.0 µA off-state current (IOFF), preventing back-driving or latch-up in partially powered systems. This feature allows safe "live insertion" into backplanes and enables hot-swap capability in modular systems using the TC74LCX540FT(EL) as an isolation buffer.
TC74LCX540FT(EL) Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- 74LCX
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Digi-Reel®
- 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:
- 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-TSSOP
TC74LCX540FT(EL) FAQ
1.How can I place an order for TC74LCX540FT(EL) through Aetrix?
Please submit a Request for Quotation (RFQ) for TC74LCX540FT(EL) 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 TC74LCX540FT(EL) reliable?
The price and inventory of TC74LCX540FT(EL) are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC74LCX540FT(EL) is usually 5 days.
3.What payment methods are accepted for TC74LCX540FT(EL)?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC74LCX540FT(EL) transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC74LCX540FT(EL)?
TC74LCX540FT(EL) orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC74LCX540FT(EL) 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 TC74LCX540FT(EL)?
For technical support, including TC74LCX540FT(EL) datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC74LCX540FT(EL) requirements.
6.How does Aetrix verify that TC74LCX540FT(EL) is sourced from the original manufacturer or authorized distributors?
All TC74LCX540FT(EL) 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 TC74LCX540FT(EL) meets industry standards.
7.What is the process for return or replacement of TC74LCX540FT(EL)?
All TC74LCX540FT(EL) units undergo pre-shipment inspection (PSI). If there is an issue with TC74LCX540FT(EL), 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 TC74LCX540FT(EL) part is unused and in its original packaging.
Return procedure for TC74LCX540FT(EL):
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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