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STMicroelectronics 74LCX541MTR
- Part No.:
- 74LCX541MTR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
74LCX541MTR.pdf
- Description:
- IC BUFFER NON-INVERT 3.6V 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,187
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Product details
Overview
74LCX541MTR from STMicroelectronics is a low-voltage CMOS octal non-inverting 3-state bus buffer with 5V-tolerant inputs and outputs, operating from 2.0V to 3.6V supply. It delivers tPD = 8.0 ns (max) at VCC = 3.0–3.6V, ±24 mA output drive, symmetrical IOH/IOL, and pin/function compatibility with standard 74-series 541. Used in 3.3V backplane and PCI bus interface applications where mixed-voltage signal translation is required.
For engineers reviewing the 74LCX541MTR datasheet, 74LCX541MTR pinout, 74LCX541MTR application, or 74LCX541MTR equivalent, key selection criteria include 5V tolerance on all I/Os, guaranteed PCI bus levels at 24 mA, balanced tPLH/tPHL propagation delays, power-down protection, and SO-20 package compatibility with legacy 74-series layouts.
Technical Context
The device implements dual active-low 3-state enable logic (G1 and G2 ANDed) to control all eight outputs simultaneously into high-impedance state. Inputs and outputs are physically segregated on opposite sides of the SO-20 package to simplify PCB routing and reduce crosstalk.
It uses sub-micron C2MOS technology with double-layer metal wiring, enabling AC/ACT-equivalent speed at 3.3V while consuming significantly less power. All I/O pins feature integrated ESD protection (HBM > 2000V, MM > 200V) and latch-up immunity exceeding 500 mA per JESD17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.0V to 3.6V - supports 3.3V systems with 1.5V data retention during sleep |
| tPD (Max) | 8.0 ns at VCC = 3.0–3.6V - enables high-speed data transfer on 3.3V buses up to ~125 MHz |
| IOL / IOH | ±24 mA at VCC = 3.0–3.6V - drives standard PCI loads without external buffers |
| Input Voltage Range | 0V to 5.5V - allows direct interfacing with 5V TTL/CMOS logic without level shifters |
| Output Skew | ≤1.0 ns - ensures tight timing alignment across all eight buffered signals |
| ICC (Quiescent) | 10 µA max - minimizes standby power in battery-backed or low-power embedded systems |
| CIN / COUT | 6 pF / 12 pF - reduces capacitive loading on driving sources and improves signal integrity |
Pinout & Package
74LCX541MTR is housed in a 20-pin Small Outline Package (SO-20), compliant with JEDEC MS-013, with body dimensions 12.60–13.00 mm × 10.00–10.65 mm and 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 | Active-low 3-state enable inputs - both must be LOW for outputs to drive; AND logic prevents accidental bus contention |
| 2–9 | A1–A8 | Data inputs - 5V-tolerant, with ±5 µA leakage and 6 pF capacitance for minimal loading |
| 11–18 | Y1–Y8 | Non-inverting buffered outputs - ±24 mA drive, 12 pF capacitance, 0.55 V VOL at 24 mA |
| 10 | GND | Ground reference - dedicated low-inductance return path for all I/O and supply currents |
| 20 | VCC | Positive supply - operates from 2.0V to 3.6V; decoupling required within 1 cm for stable high-speed switching |
Key Features
| Feature | Design Value |
|---|---|
| 5V-tolerant I/O | Supports direct connection to 5V logic without external level translators or clamping diodes |
| Symmetrical output drive | |IOH| = IOL = 24 mA min - eliminates skew-induced duty cycle distortion in clock/data distribution |
| Power-down protection | Inputs and outputs remain high-impedance and non-destructive when VCC = 0V - safe for hot-swap and partial-power-down systems |
| PCI bus compliance | Guaranteed 24 mA drive at 3.3V meets PCI Local Bus Specification Rev. 2.2 electrical requirements |
| Low dynamic power | CPD = 25 pF - enables efficient operation at high frequencies with predictable ICC(opr) = CPD × VCC × fIN + ICC/8 |
Applications
| PCI Bus Interface | 3.3V Backplane Buffering |
|---|---|
Use Scenario: Interfacing 3.3V microcontrollers or FPGAs to legacy 5V PCI slots in industrial control cards. IC Role / Device Role / Timing Role: Non-inverting 3-state bus buffer providing bidirectional 5V-tolerant signal translation and drive strength matching PCI spec. Use Value: Eliminates need for discrete level shifters and external pull-ups, reducing BOM count and layout area by ~30%. | Use Scenario: Driving parallel address/data lines across long traces on 3.3V industrial backplanes with mixed-voltage peripherals. IC Role / Device Role / Timing Role: Octal buffer isolating source logic from trace capacitance while maintaining signal integrity and timing margins. Use Value: 8.0 ns max propagation delay and ≤1.0 ns output skew ensure setup/hold compliance across 8-bit wide buses at 100+ MHz. |
| Hot-Swappable Module I/O | Low-Power Embedded Data Path |
Use Scenario: Enabling safe insertion/removal of mezzanine cards in powered 3.3V telecom chassis with live backplane. IC Role / Device Role / Timing Role: 3-state buffer with power-down protection preventing bus contention and latch-up during card insertion. Use Value: Input/output protection at VCC = 0V avoids damage from floating 5V signals during hot-swap transients. | Use Scenario: Isolating sensor ADC outputs or display controller data paths in portable medical devices running from 3.3V Li-ion supplies. IC Role / Device Role / Timing Role: Low-quiescent-current (10 µA) buffer enabling selective power gating of subsystems without signal corruption. Use Value: 1.5V data retention allows memory-mapped registers to retain state during deep-sleep modes, reducing wake-up latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74LVC541APW,118 (Nexperia) | Same SO-20 package, 1.65–3.6V VCC range, slightly higher ICC (40 µA), identical 5V tolerance and 24 mA drive | LVC family offers wider voltage range but lower noise margin at 2.0V; requires tighter VCC regulation below 2.3V | Preferred for new designs targeting 1.8V–3.3V multi-rail systems with tighter supply tolerance budgets |
| SN74LVC8T245RHLR (TI) | 8-bit dual-supply translator (VCCA=1.65–3.6V, VCCB=1.65–5.5V), not pin-compatible, requires separate enable per direction | Supports true bidirectional level translation (e.g., 1.8V ↔ 5V), unlike unidirectional 74LCX541 | Select only when bidirectional voltage translation is required; otherwise adds unnecessary complexity and cost |
Compared with 74LVC541APW and SN74LVC8T245RHLR, the 74LCX541MTR provides optimal balance of proven 5V-tolerant drive, SO-20 footprint compatibility, and ultra-low static current-making it ideal for cost-sensitive, high-reliability 3.3V-to-5V interface applications where unidirectional buffering suffices.
Availability
74LCX541MTR is available at Aetrix Electronics and suitable for PCI bus interface design, 3.3V backplane buffering, and hot-swappable module I/O requiring stable component supply and long-term industrial availability.
Supply support for 74LCX541MTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, power, and microcontroller solutions with vertical manufacturing and broad IP portfolio.
The 74LCX logic family was designed specifically for high-speed, low-voltage 3.3V system interfacing with legacy 5V infrastructure-emphasizing robustness, pin compatibility, and seamless integration into mixed-voltage PCB architectures.
FAQ
Can 74LCX541MTR operate with VCC = 2.0V while driving 5V-tolerant loads?
Yes. At VCC = 2.0V, the device maintains full 5V input tolerance and high-impedance output states, but output drive strength drops to ±12 mA (per datasheet, VCC = 2.7V). For reliable 24 mA drive, VCC must be ≥2.7V. Logic thresholds (VIH/VIL) remain valid across the full 1.5–3.6V range.
What is the maximum recommended input rise/fall time for reliable operation?
The datasheet specifies dt/dv ≤ 10 ns/V for input transitions. At VCC = 3.3V, this corresponds to a minimum edge rate of ~330 V/µs - meaning rise/fall times should not exceed ~10 ns for clean switching. Slower edges increase susceptibility to noise-induced glitches near logic thresholds.
Does 74LCX541MTR require external pull-up or pull-down resistors on G1/G2?
No. G1 and G2 have no internal pull resistors, but their logic thresholds (VIL = 0.8V, VIH = 2.0V at VCC = 3.0V) allow direct connection to 3.3V CMOS outputs. If driven from open-drain or high-impedance sources, external pull-downs (to GND) are recommended to ensure defined LOW state during power-up or reset.
How does the 74LCX541MTR handle simultaneous switching of all eight outputs?
Dynamic specifications (tPLH/tPHL, skew) are measured with "n−1" outputs switching while one remains LOW - reflecting worst-case ground bounce and supply droop. The 1.0 ns max skew and 8.0 ns max tPD guarantee timing integrity even under full-load switching, provided proper PCB decoupling (≥100 nF per VCC pin) is implemented.
74LCX541MTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74LCX
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Logic Type:
- Buffer, Non-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:
- 2V ~ 3.6V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
74LCX541MTR FAQ
1.How can I place an order for 74LCX541MTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74LCX541MTR 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 74LCX541MTR reliable?
The price and inventory of 74LCX541MTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74LCX541MTR is usually 5 days.
3.What payment methods are accepted for 74LCX541MTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74LCX541MTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74LCX541MTR?
74LCX541MTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74LCX541MTR 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 74LCX541MTR?
For technical support, including 74LCX541MTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74LCX541MTR requirements.
6.How does Aetrix verify that 74LCX541MTR is sourced from the original manufacturer or authorized distributors?
All 74LCX541MTR 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 74LCX541MTR meets industry standards.
7.What is the process for return or replacement of 74LCX541MTR?
All 74LCX541MTR units undergo pre-shipment inspection (PSI). If there is an issue with 74LCX541MTR, 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 74LCX541MTR part is unused and in its original packaging.
Return procedure for 74LCX541MTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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