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STMicroelectronics M74HCT540RM13TR
- Part No.:
- M74HCT540RM13TR
- Manufacturer:
- STMicroelectronics
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HCT540RM13TR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,511
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Product details
Overview
M74HCT540RM13TR from STMicroelectronics is an octal inverting bus buffer with 3-state outputs, designed for high-speed TTL-compatible digital interfacing in industrial control and data acquisition systems. It features 12 ns typical propagation delay at 4.5 V, ±6 mA symmetrical output drive, and dual active-low enable inputs (G1, G2) that place all eight outputs in high-impedance state when asserted.
For engineers reviewing the M74HCT540RM13TR datasheet, M74HCT540RM13TR pinout, M74HCT540RM13TR application, or M74HCT540RM13TR equivalent, key selection criteria include guaranteed 3-state timing (tPZL/tPHZ ≤ 41 ns), low ICC of 4 µA max at 25°C, input compatibility with TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), and TSSOP20 package suitability for space-constrained PCB layouts.
Technical Context
The device implements silicon gate C2MOS technology to achieve TTL-level input compatibility while maintaining CMOS power efficiency. Its dual AND-gated 3-state control (G1 ∧ G2) ensures deterministic bus isolation, and balanced tPLH/tPHL delays support clean signal integrity in bidirectional data paths.
Input protection circuits guard against ESD and transient overvoltage, and the symmetrical output impedance (|IOH| = IOL ≥ 6 mA) enables matched rise/fall times and reduced signal distortion across all eight buffered channels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| tPD | 12 ns typical propagation delay at VCC = 4.5 V - enables reliable operation in 33 MHz synchronous bus systems |
| ICC | 4 µA maximum quiescent supply current at TA = 25°C - supports ultra-low-power standby modes |
| VIH / VIL | 2.0 V min / 0.8 V max - ensures robust recognition of TTL output logic levels |
| IOH / IOL | –6 mA / +6 mA minimum - delivers sufficient drive strength for fan-out to 10 LSTTL loads |
| tPZL / tPHZ | 19 ns / 27 ns typical disable time - guarantees fast bus release for time-critical arbitration |
| CIN | 5 pF typical input capacitance - minimizes loading on upstream drivers and preserves edge rate |
| Operating Temp | –55°C to +125°C - qualified for extended industrial and automotive under-hood environments |
Pinout & Package
Supplied in a 20-pin TSSOP (Thin Shrink Small Outline Package) with 0.65 mm pitch, body dimensions 6.5 × 6.4 × 1.05 mm, and exposed pad not present. Pin numbering follows JEDEC standard with Pin 1 marked by beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | G1, G2 | Active-low 3-state enable inputs - both must be LOW to activate outputs; OR function for bus arbitration |
| 2–9 | A1–A8 | Inverting data inputs - each drives corresponding Yn output with logical inversion |
| 11–18 | Y1–Y8 | Inverting 3-state bus outputs - high-impedance when G1 or G2 is HIGH |
| 10 | GND | Digital ground reference - decoupling capacitor placement critical for noise immunity |
| 20 | VCC | Positive supply (4.5–5.5 V) - requires local 100 nF ceramic bypass near Pin 20 |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state buffer architecture | Enables bidirectional bus sharing without external direction control logic |
| Pin- and function-compatible with 74LS540 | Allows drop-in replacement in legacy TTL designs with no layout change |
| Balanced tPLH ≅ tPHL propagation | Reduces duty cycle distortion in clock distribution and data strobe applications |
| Symmetrical |IOH| = IOL = 6 mA drive | Ensures matched rise/fall times and consistent signal thresholds across all channels |
| Input ESD protection | Withstands ±2 kV HBM per IEC 61000-4-2 - eliminates need for external TVS on control lines |
Applications
| Industrial PLC Backplane Interface | Automotive Body Control Module |
|---|---|
Use Scenario: Interfacing microcontroller GPIOs to modular I/O expansion cards via shared parallel backplane bus. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating MCU address/data lines from hot-swappable peripheral modules. Use Value: Dual enable inputs allow independent module activation; 12 ns tPD supports 25 MHz backplane clocking with margin. | Use Scenario: Driving multiplexed sensor readout lines (e.g., door latch, window position) in centralized BCM. IC Role / Device Role / Timing Role: Level-shifting and fan-out buffer between 3.3 V MCU and 5 V analog front-end subsystems. Use Value: TTL-compatible inputs accept direct connection to legacy 5 V sensors; –55°C to +125°C rating ensures under-dash reliability. |
| Test Equipment Digital Pattern Generator | Medical Diagnostic Data Acquisition |
Use Scenario: Generating synchronized stimulus patterns across 8-channel DUT interfaces using FPGA-controlled parallel bus. IC Role / Device Role / Timing Role: Output driver stage providing precise edge-aligned signals with controlled slew and termination matching. Use Value: 6 mA drive capability sustains signal integrity into 50 Ω coaxial loads; tPZL ≤ 41 ns enables sub-25 ns channel enable sequencing. | Use Scenario: Isolating ADC interface bus in portable ultrasound front-end where EMI immunity and low standby power are critical. IC Role / Device Role / Timing Role: Bus buffer enabling dynamic power gating of ADC subsystem during sleep cycles. Use Value: 4 µA ICC max extends battery life; input protection prevents latch-up from transducer coupling noise. |
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 |
|---|---|---|---|
| SN74HCT540PW | Same logic function and AC specs; 20-pin TSSOP but TI's package has different thermal pad design and moisture sensitivity level (MSL 1 vs MSL 3) | Requires requalification for humidity-sensitive reflow profiles in high-reliability medical assembly | Prefer for TI-centric BOMs or where MSL 1 handling simplifies manufacturing |
| 74VHC540FT | Higher speed (tPD = 7.5 ns typ), lower drive (±8 mA), but VIH/VIL thresholds differ (VIH = 3.5 V min at VCC = 5 V) | Not TTL-input compatible - requires level translation when interfacing legacy 5 V TTL sources | Select only when driving modern 3.3 V logic and speed > 100 MHz is required |
Compared with SN74HCT540PW and 74VHC540FT, the M74HCT540RM13TR uniquely combines guaranteed TTL input compatibility, industrial temperature range, and MSL3-compliant TSSOP packaging - making it optimal for cost-sensitive, mixed-voltage industrial retrofits.
Availability
M74HCT540RM13TR is available at Aetrix Electronics and suitable for industrial PLC backplanes, automotive body control modules, test equipment pattern generators, and medical diagnostic data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for M74HCT540RM13TR 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, and power management ICs with vertical manufacturing capabilities and AEC-Q100 qualification expertise.
The M74HCT540RM13TR belongs to ST's HCT logic family, engineered specifically for seamless interoperability between legacy TTL systems and modern CMOS controllers in harsh-environment industrial automation.
FAQ
What is the maximum recommended operating voltage for M74HCT540RM13TR?
The absolute maximum supply voltage is +7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per STMicroelectronics' datasheet. Operation outside this window risks exceeding input threshold margins, increasing ICC beyond specification, and violating AC timing guarantees - especially tPLH/tPHL and tPZL/tPHZ values measured at CL = 50 pF.
Can M74HCT540RM13TR drive a 50 Ω transmission line directly?
No - its 6 mA output drive is insufficient for proper 50 Ω termination. The device is rated for fan-out to standard LSTTL loads (≈ 200 Ω), not RF transmission lines. For 50 Ω systems, use a dedicated line driver (e.g., SN65LVDS1) or add series termination resistors and verify signal integrity with oscilloscope measurements at the load end.
Is the TSSOP20 package RoHS compliant and lead-free?
Yes - the M74HCT540RM13TR uses STMicroelectronics' standard RoHS-compliant, lead-free TSSOP20 package (package code RM13TR), verified per JEDEC J-STD-020D moisture sensitivity level 3 and fully compliant with EU Directive 2011/65/EU and China RoHS II.
How does the dual-enable (G1/G2) logic affect bus arbitration in multi-master systems?
G1 and G2 form a wired-AND enable: both must be LOW for outputs to drive. This allows hierarchical bus control - e.g., one master asserts G1 while another controls G2, enabling priority-based access without external logic. The 18 ns typical tPZL ensures rapid bus release, minimizing arbitration latency in real-time control loops.
M74HCT540RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
M74HCT540RM13TR FAQ
1.How can I place an order for M74HCT540RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HCT540RM13TR 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 M74HCT540RM13TR reliable?
The price and inventory of M74HCT540RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HCT540RM13TR is usually 5 days.
3.What payment methods are accepted for M74HCT540RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HCT540RM13TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HCT540RM13TR?
M74HCT540RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HCT540RM13TR 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 M74HCT540RM13TR?
For technical support, including M74HCT540RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HCT540RM13TR requirements.
6.How does Aetrix verify that M74HCT540RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HCT540RM13TR 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 M74HCT540RM13TR meets industry standards.
7.What is the process for return or replacement of M74HCT540RM13TR?
All M74HCT540RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HCT540RM13TR, 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 M74HCT540RM13TR part is unused and in its original packaging.
Return procedure for M74HCT540RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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