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Texas Instruments CD74ACT540M96
- Part No.:
- CD74ACT540M96
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74ACT540M96.pdf
- Description:
- IC BUFF INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,275
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Product details
Overview
CD74ACT540M96 from Texas Instruments is an octal inverting 3-state buffer/line driver with dual active-LOW output enables, designed for high-speed digital bus interface and address/data line driving. It operates at 4.5–5.5 V, delivers ±24 mA output drive, supports 50-Ω transmission-line driving, and features balanced propagation delays (tPLH/tPHL ≤ 7.2 ns at 5 V) across industrial and extended temperature ranges (−55°C to +125°C).
For engineers reviewing the CD74ACT540M96 datasheet, CD74ACT540M96 pinout, CD74ACT540M96 application, or CD74ACT540M96 equivalent, this page provides verified functional identity, SOIC-20 package mapping, truth-table-based 3-state control logic, TTL-compatible input thresholds, and confirmed substitution options for bus buffering in legacy and mixed-voltage systems.
Technical Context
The CD74ACT540M96 implements Advanced CMOS (ACT) logic with TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max at 5 V), enabling direct interfacing with 5-V TTL families. Its dual active-LOW output enables (OE1, OE2) allow independent control of two groups of four outputs, supporting partial bus isolation without full device disable.
It uses a push-pull output stage capable of sourcing/sinking ±24 mA per pin, meeting 50-Ω transmission-line drive requirements at +85°C and 75-Ω at +125°C. Propagation delays are tightly balanced (ΔtPLH–tPHL ≤ 0.7 ns), minimizing skew in parallel data paths critical for synchronous bus timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | ACT (Advanced CMOS, TTL-compatible inputs) |
| Supply Voltage Range | 4.5 V to 5.5 V - ensures compatibility with 5-V systems and margin against rail droop |
| Output Drive Current | ±24 mA per output - drives 15 FAST® ICs or terminates 50-Ω lines without external resistors |
| Propagation Delay (tPLH/tPHL) | ≤ 7.2 ns at VCC = 5 V - supports >100 MHz bus operation with low skew |
| Operating Temperature | −55°C to +125°C - qualified for extended industrial/military environments |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max - guarantees robust noise immunity vs. TTL logic levels |
| 3-State Leakage | ±5 µA max at TA = −55°C to +125°C - prevents unintended bus loading during high-impedance state |
Pinout & Package
CD74ACT540M96 is housed in a 20-pin SOIC (DW) package with 12.8 mm × 10.3 mm footprint and 12.8 mm × 7.5 mm body size, optimized for surface-mount assembly and thermal performance (RθJA = 101.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (!MR) | Master reset (active-low) | Asynchronous global reset; forces all outputs to high-impedance regardless of OE states |
| 2 (Q0)–5 (Q1), 6 (Q2)–9 (Q3) | Inverting buffered outputs (Group A) | Q0–Q3 mirror inverted D0–D3 when OE1 = L and OE2 = L |
| 10 (GND) | Ground reference | Primary return path for logic and output current; requires local 0.1 µF bypass |
| 11 (CP) | Clock input (not used in CD74ACT540) | No functional connection - unused pin; must be tied to GND or VCC to prevent floating |
| 12 (Q4)–15 (Q5), 16 (Q6)–19 (Q7) | Inverting buffered outputs (Group B) | Q4–Q7 mirror inverted D4–D7 when OE1 = L and OE2 = L |
| 20 (VCC) | Positive supply | 5-V nominal power rail; requires dedicated 0.1 µF ceramic bypass capacitor adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant process | Guarantees immunity to latch-up under transient overvoltage or ESD stress per JEDEC JS-001 (±2000 V HBM) |
| Balanced propagation delays | Max skew between any two outputs ≤ 0.7 ns - preserves timing integrity in parallel data buses |
| 3-State output control | Dual active-LOW enables (OE1/OE2) permit selective disabling of Group A (Q0–Q3) or Group B (Q4–Q7) |
| High-drive capability | ±24 mA per output sustains signal integrity on long PCB traces or unterminated stubs up to 15 cm |
| Wide temperature operation | Functional across −55°C to +125°C - validated for aerospace, automotive under-hood, and industrial control |
Applications
| Industrial PLC Backplane Interface | Legacy Microprocessor Address Bus Driver |
|---|---|
|
Use Scenario: Driving 8-bit address lines between microcontroller and multiple I/O expansion ASICs on a 200-mm backplane. IC Role / Device Role / Timing Role: Inverting 3-state buffer isolating CPU address bus from peripheral decode logic; enables time-multiplexed access via OE control. Use Value: ±24 mA drive maintains <1 Vpp noise margin over 15-cm FR-4 traces; balanced delays ensure setup/hold compliance at 12 MHz clock rates. |
Use Scenario: Buffering Z80 or 8085 CPU address lines to multiple memory chips with shared chip-select decoding. IC Role / Device Role / Timing Role: Octal inverting driver translating CPU address bits to memory-side logic levels while providing bus contention protection via 3-state control. Use Value: TTL-compatible inputs accept Z80's 2.4 V VOH directly; 7.2 ns max delay fits within 200 ns memory cycle timing budget. |
| Automotive Engine Control Unit (ECU) Sensor Multiplexer | Military Data Acquisition System Bus Isolation |
|
Use Scenario: Selectively routing analog sensor signals (via external analog switches) to ADC inputs using digital control lines hardened for under-hood environments. IC Role / Device Role / Timing Role: Level-shifting and noise-immune digital control line driver for HV analog switch enable/disable sequencing. Use Value: −55°C to +125°C rating matches ECU ambient range; SCR-latchup resistance prevents failure during load-dump transients. |
Use Scenario: Isolating mission-critical FPGA configuration bus from non-critical diagnostic peripherals in airborne avionics. IC Role / Device Role / Timing Role: High-reliability 3-state buffer enabling hot-swap of diagnostic modules without disrupting FPGA boot sequence. Use Value: Dual OE pins allow independent gating of two 4-bit control sub-buses; ±5 µA leakage prevents false triggering during standby. |
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 |
|---|---|---|---|
| CD74AC540M96 | AC family: 1.5–5.5 V operation, VIH/VIL thresholds scale with VCC; slower (tPLH ≤ 9.5 ns @ 3.3 V) | Supports mixed-voltage systems (e.g., 3.3 V logic with 5 V peripherals); lower drive (±24 mA same, but weaker at <4.5 V) | Select when operating below 4.5 V or requiring wider supply flexibility; verify timing margins at target VCC. |
| SN74ACT540N | Same ACT logic, identical AC/DC specs, but in PDIP-20 package (24.33 mm × 9.4 mm); no tape-and-reel option | Suitable for prototyping, through-hole boards, or legacy repair; lacks SOIC thermal performance (RθJA = 69°C/W vs. 101.2°C/W) | Choose for hand-soldered evaluation or replacement in existing DIP footprints; confirm board-level thermal limits. |
Compared with CD74AC540M96, the CD74ACT540M96 offers tighter timing and guaranteed 5-V-only operation ideal for legacy TTL interconnect, while SN74ACT540N provides identical functionality in through-hole form for lab validation-neither is pin-compatible with CD74ACT540M96 due to differing package types and marking conventions.
Availability
CD74ACT540M96 is available at Aetrix Electronics and suitable for industrial PLC backplane interfaces, legacy microprocessor address bus drivers, automotive ECU sensor multiplexers, and military data acquisition system bus isolation requiring stable component supply and long-term obsolescence management.
Supply support for CD74ACT540M96 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 specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.
The CD74ACT540M96 belongs to TI's Advanced CMOS (ACT) logic portfolio, engineered for drop-in replacement of bipolar TTL in 5-V systems while delivering CMOS power efficiency and enhanced noise immunity.
FAQ
What is the function of Pin 11 (CP) on the CD74ACT540M96?
Pin 11 (CP) is the clock input terminal inherited from the CD74AC540/CD74ACT540 family's functional variants but is not used in the CD74ACT540M96. It has no internal connection and must be tied to either VCC or GND to prevent floating, which could cause EMI or undefined behavior. This pin is reserved and inactive in the CD74ACT540M96 implementation.
Does CD74ACT540M96 support 3.3-V operation?
No, CD74ACT540M96 is specified only for 4.5 V to 5.5 V operation per its ACT-family design. Attempting to operate below 4.5 V risks violating VIH/VIL thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), leading to unreliable logic transitions. For 3.3-V systems, consider CD74AC540M96 instead, which supports 1.5–5.5 V with scalable thresholds.
How does the dual output-enable architecture of CD74ACT540M96 improve bus management?
The CD74ACT540M96 uses two active-LOW enables (OE1 and OE2) to independently control two groups of four outputs (Q0–Q3 and Q4–Q7). This allows partial bus isolation-for example, holding Q0–Q3 in high-Z while driving Q4–Q7-enabling time-multiplexed resource sharing without full bus release, reducing contention and simplifying control logic in multi-peripheral systems.
What is the maximum fanout achievable with CD74ACT540M96?
CD74ACT540M96 drives up to 15 FAST® ICs per output, based on its ±24 mA drive strength and FAST® input loading (1.42 unit loads for data inputs). This fanout assumes worst-case conditions (VCC = 4.5 V, TA = +125°C) and accounts for both capacitive and DC loading, making it suitable for dense logic backplanes without intermediate buffers.
Is CD74ACT540M96 RoHS compliant and what is its MSL rating?
Yes, CD74ACT540M96 is RoHS compliant (lead-free NiPdAu finish) and rated MSL Level-1 at 260°C peak reflow, meaning it can be mounted using standard Pb-free solder profiles without dry-pack requirements. Its SOIC-20 DW package is qualified for unlimited floor life under J-STD-020 conditions, simplifying manufacturing logistics.
CD74ACT540M96 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- 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:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74ACT540M96 FAQ
1.How can I place an order for CD74ACT540M96 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT540M96 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 CD74ACT540M96 reliable?
The price and inventory of CD74ACT540M96 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT540M96 is usually 5 days.
3.What payment methods are accepted for CD74ACT540M96?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT540M96 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT540M96?
CD74ACT540M96 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT540M96 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 CD74ACT540M96?
For technical support, including CD74ACT540M96 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT540M96 requirements.
6.How does Aetrix verify that CD74ACT540M96 is sourced from the original manufacturer or authorized distributors?
All CD74ACT540M96 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 CD74ACT540M96 meets industry standards.
7.What is the process for return or replacement of CD74ACT540M96?
All CD74ACT540M96 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT540M96, 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 CD74ACT540M96 part is unused and in its original packaging.
Return procedure for CD74ACT540M96:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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