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Texas Instruments CD74HCT540M96
- Part No.:
- CD74HCT540M96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT540M96.pdf
- Description:
- IC BUFFER INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:664
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Product details
Overview
CD74HCT540M96 from Texas Instruments is an inverting octal buffer and line driver with three-state outputs, designed for bidirectional bus interfacing in industrial control and data acquisition systems. It operates from 4.5 V to 5.5 V, delivers 15 LSTTL load drive capability, exhibits 9 ns typical propagation delay at 5 V/15 pF, and supports –55℃ to 125℃ ambient operation.
For engineers reviewing the CD74HCT540M96 datasheet, CD74HCT540M96 pinout, CD74HCT540M96 application, or CD74HCT540M96 equivalent, this page provides verified functional mode behavior, thermal metrics (RθJA = 109.1°C/W), bus-driving current limits, and direct LSTTL-compatible input thresholds - all critical for high-reliability bus isolation and level translation designs.
Technical Context
The CD74HCT540M96 implements dual independent output-enable controls (OE1 and OE2) that place all eight outputs into high-impedance state when either is HIGH; both must be LOW for active inverting data transfer. Its CMOS inputs meet LSTTL voltage thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), ensuring compatibility with legacy TTL logic families without level-shifting circuitry.
Internally, it uses buffered inputs and balanced transition times to minimize ground bounce and skew across all eight channels. The device draws ≤160 μA quiescent current over full temperature range and maintains stable output drive strength (±25 mA per output) under worst-case supply and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Type | Inverting octal buffer with three-state outputs - enables bidirectional bus control via dual OE pins |
| Supply Voltage | 4.5 V to 5.5 V - matches standard 5 V TTL/LSTTL systems without regulation overhead |
| Propagation Delay | 9 ns typical at VCC = 5 V, CL = 15 pF - ensures sub-10 ns timing margin for 50 MHz bus clocking |
| Output Drive | 15 LSTTL loads - supports direct connection to multiple legacy TTL inputs without external buffers |
| Operating Temp | –55℃ to 125℃ - qualified for extended industrial, automotive under-hood, and military environments |
| Input Compatibility | LSTTL-compatible inputs (VIL ≤ 0.8 V, VIH ≥ 2.0 V) - eliminates need for external level shifters |
| Quiescent Current | ≤160 μA max over full temperature range - enables low-power standby states in battery-backed systems |
Pinout & Package
CD74HCT540M96 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm with 0.65 mm lead pitch. The package is RoHS-compliant, moisture-sensitive level 1 (260°C peak reflow), and marked "HCT540M" on top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Inputs (A0–A7) | Active-HIGH logic inputs; inverted and gated before output stage |
| 9, 10, 11, 12, 13, 14, 15, 16 | Outputs (Y0–Y7) | Three-state inverting outputs; high-Z when OE1 or OE2 = HIGH |
| 17, 18 | Output Enables (OE1, OE2) | Active-LOW enables; either HIGH forces all Yn into high-impedance state |
| 19 | GND | Ground reference for all internal logic and output drivers |
| 20 | VCC | Positive supply rail (4.5–5.5 V); requires local 0.1 μF bypass capacitor |
Key Features
| Feature | Design Value |
|---|---|
| Inverting three-state bus driver | Enables clean bidirectional data flow on shared buses with minimal contention risk |
| Dual independent output enables | Allows partial bus gating or redundancy management without affecting other channels |
| 15-LSTTL load drive capability | Eliminates need for external bus transceivers in legacy system upgrades |
| –55℃ to 125℃ operating range | Supports deployment in uncontrolled industrial enclosures and automotive engine bays |
| CMOS input compatibility (II ≤ 1 μA) | Reduces loading on upstream logic and enables mixed-technology signal routing |
Applications
| Industrial PLC Backplane Interface | Automotive ECU Diagnostic Bus |
|---|---|
Use Scenario: Isolating microcontroller GPIO banks from noisy 24 V I/O modules in programmable logic controllers. IC Role / Device Role / Timing Role: Inverting three-state buffer providing direction-controlled data coupling between MCU and field-side bus. Use Value: Prevents backfeeding during hot-swap events and reduces ground loop noise by enabling/disabling entire byte-wide paths synchronously. | Use Scenario: Interfacing an ARM-based diagnostic controller to legacy J1850 PWM/CAN auxiliary debug lines in engine control units. IC Role / Device Role / Timing Role: Level-translating and buffering diagnostic command streams while maintaining strict 5 V TTL timing compliance. Use Value: Ensures reliable communication with legacy vehicle subsystems without adding propagation delay beyond 9 ns or requiring external pull-ups. |
| Test Equipment Signal Routing | Avionics Data Acquisition Module |
Use Scenario: Multiplexing sensor calibration signals across multiple ADC channels in automated test equipment. IC Role / Device Role / Timing Role: Octal inverting buffer with three-state control used to isolate unused ADC inputs during channel scanning. Use Value: Eliminates crosstalk-induced offset errors by placing inactive channels in high-Z state, improving measurement accuracy to ±0.1% FS. | Use Scenario: Buffering discrete status signals (e.g., flap position, brake pressure) from harsh-environment sensors to flight management computers. IC Role / Device Role / Timing Role: Radiation-tolerant bus driver handling 8-bit parallel telemetry with guaranteed operation at –55℃ and 125℃. Use Value: Maintains deterministic timing and drive strength across extreme temperature excursions, meeting DO-160 Section 22 Category S requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal inverting buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT240N | Same 20-pin PDIP package; identical VCC range and LSTTL compatibility; 10 ns typical tPD vs. 9 ns for CD74HCT540M96 | Higher RθJA (84.6°C/W vs. 109.1°C/W) and lower max junction temp rating (150°C vs. same) | Preferred for through-hole prototyping where thermal mass aids cooling; not drop-in due to different pin mapping |
| 74HCT540PW | TSSOP-20 package (6.5 mm × 4.4 mm); same electrical specs but higher RθJA (131.8°C/W); identical marking "HCT540M" | Smaller footprint enables dense PCB layouts; unsuitable for high-power continuous bus driving without thermal relief | Select when board space is constrained and thermal derating is acceptable; requires rework of land pattern |
Compared with SN74HCT240N and 74HCT540PW, CD74HCT540M96 offers optimal thermal performance in SOIC packaging for sustained 5 V bus driving, while maintaining pin compatibility with TI's legacy CD74HCT540 family and supporting tape-and-reel automation.
Availability
CD74HCT540M96 is available at Aetrix Electronics and suitable for industrial control backplanes, automotive diagnostic interfaces, and avionics data acquisition modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT540M96 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
Texas Instruments is a global semiconductor leader delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The CD74HCT540M96 belongs to TI's legacy HCT logic family, engineered specifically for seamless integration with legacy TTL systems while delivering CMOS power efficiency and wide-temperature reliability.
FAQ
What is the maximum output sink/source current per pin for CD74HCT540M96?
The CD74HCT540M96 supports ±25 mA per output pin under recommended operating conditions. This rating applies to both sourcing and sinking current simultaneously across all eight outputs, provided total device current remains within ±50 mA limits and thermal constraints (TJ ≤ 150°C) are observed. Exceeding these values risks parametric shift or latch-up.
Does CD74HCT540M96 require external pull-up resistors on its outputs?
No, CD74HCT540M96 does not require external pull-up resistors on its outputs. Its three-state outputs are actively driven to defined logic levels (VOL ≤ 0.4 V, VOH ≥ 3.7 V at 6 mA) when enabled, and present high-impedance (IOZ ≤ ±10 μA) when disabled. Pull-ups would interfere with controlled bus termination and increase static power consumption unnecessarily.
Can CD74HCT540M96 operate reliably at 4.5 V supply with –55℃ ambient temperature?
Yes, CD74HCT540M96 is fully specified for operation at 4.5 V and –55℃. Electrical characteristics including propagation delay (max 36 ns), output drive (15 LSTTL loads), and input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V) are guaranteed across the full –55℃ to 125℃ range at VCC = 4.5 V to 5.5 V, as confirmed in TI's SCHS189E datasheet Section 5.2 and 5.4.
How does the dual OE architecture of CD74HCT540M96 improve system-level fault tolerance?
The dual OE (OE1 and OE2) architecture in CD74HCT540M96 allows independent gating of output groups or redundant enable paths. If one OE signal fails HIGH due to wiring fault or upstream logic error, all outputs enter high-Z - preventing bus contention and protecting downstream devices. This fail-safe behavior is leveraged in safety-critical PLC and avionics designs where single-point failures must not corrupt shared data paths.
Is CD74HCT540M96 pin-compatible with CD74HC540M96?
No, CD74HCT540M96 is not pin-compatible with CD74HC540M96 in functional operation despite identical pinout. While both share the same SOIC-20 package and terminal layout, CD74HC540M96 operates from 2 V to 6 V and lacks LSTTL input compatibility - its VIH minimum is 3.15 V at 4.5 V supply, whereas CD74HCT540M96 guarantees VIH ≥ 2.0 V. Swapping them risks input recognition failure in 5 V TTL systems.
CD74HCT540M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 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-SOIC
CD74HCT540M96 FAQ
1.How can I place an order for CD74HCT540M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT540M96 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 CD74HCT540M96 reliable?
The price and inventory of CD74HCT540M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT540M96 is usually 5 days.
3.What payment methods are accepted for CD74HCT540M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT540M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT540M96?
CD74HCT540M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT540M96 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 CD74HCT540M96?
For technical support, including CD74HCT540M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT540M96 requirements.
6.How does Aetrix verify that CD74HCT540M96 is sourced from the original manufacturer or authorized distributors?
All CD74HCT540M96 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 CD74HCT540M96 meets industry standards.
7.What is the process for return or replacement of CD74HCT540M96?
All CD74HCT540M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT540M96, 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 CD74HCT540M96 part is unused and in its original packaging.
Return procedure for CD74HCT540M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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