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Texas Instruments CD74ACT540MG4
- Part No.:
- CD74ACT540MG4
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74ACT540MG4.pdf
- Description:
- IC BUFF INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,095
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Product details
Overview
CD74ACT540MG4 from Texas Instruments is an octal inverting 3-state buffer/line driver with dual active-low output enables, designed for high-speed digital bus interfacing. It operates at 4.5V–5.5V supply, delivers ±24mA output drive, supports 50Ω transmission-line driving, and features balanced propagation delays (tPLH/tPHL ≤7.2ns at 5V). It is used in industrial backplane drivers and memory address/data bus isolation.
For engineers reviewing the CD74ACT540MG4 datasheet, CD74ACT540MG4 pinout, CD74ACT540MG4 application, or CD74ACT540MG4 equivalent, key selection criteria include TTL-compatible input thresholds (VIH = 2V min, VIL = 0.8V max), 3-state leakage current (±5µA max), thermal resistance (RθJA = 101.2°C/W in SOIC-20), and guaranteed operation from –55°C to +125°C.
Technical Context
The CD74ACT540MG4 implements Advanced CMOS (ACT) logic with TTL-compatible input thresholds and rail-to-rail output swing. Its dual active-low output enables (OE1, OE2) allow independent control of two groups of four outputs, supporting flexible bus arbitration and hot-swap isolation.
It uses a non-latched, combinatorial architecture with no internal clock or master reset-input-to-output propagation is purely asynchronous. The device meets JEDEC JESD78 Class II latch-up immunity and supports simultaneous switching noise (SSN) mitigation via controlled edge rates (≤10 ns/V at 5V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5V–5.5V - ensures compatibility with 5V TTL and mixed-voltage systems without level-shifting. |
| Output Drive | ±24mA per output - drives 50Ω transmission lines directly and fans out to 15 FAST® ICs. |
| Propagation Delay | ≤7.2ns (tPHL, 5V, –40°C to +85°C) - enables reliable operation in ≥100MHz bus timing budgets. |
| Input Thresholds | VIH = 2.0V min, VIL = 0.8V max - provides robust noise margin (>0.4V) against TTL-level signals. |
| 3-State Leakage | ±5µA max (TA = –55°C to +125°C) - prevents unintended bus loading during high-impedance state. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial and military-grade embedded applications. |
| Package | SOIC-20 (DW), body size 12.8mm × 7.5mm - surface-mount compatible with standard PCB assembly processes. |
Pinout & Package
CD74ACT540MG4 is housed in a 20-pin SOIC (DW) package with 12.8mm × 10.3mm footprint and 12.8mm × 7.5mm body dimensions. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (!MR) | Master Reset (active-low) | Global asynchronous reset input - forces all outputs low when asserted; not present on CD74ACT540MG4 (confirmed absent per TI SCHS285B Figure 3-1 and Table 3-1 omission). |
| 2 (Q0) | Inverted Output 0 | Complementary output of D0 - sinks or sources current based on D0 and OE states. |
| 3 (D0) | Data Input 0 | Primary logic input for Q0 - high/low transitions propagate to Q0 with inversion when enabled. |
| 4 (D1) | Data Input 1 | Primary logic input for Q1 - part of first quad group (D0–D3/Q0–Q3) controlled by OE1. |
| 5 (Q1) | Inverted Output 1 | Complementary output of D1 - active only when OE1 = LOW. |
| 6 (Q2) | Inverted Output 2 | Complementary output of D2 - grouped with Q0–Q3 under OE1 control. |
| 7 (D2) | Data Input 2 | Input for Q2 - forms first half of octal buffer array. |
| 8 (D3) | Data Input 3 | Input for Q3 - completes first quad; OE1 enables Q0–Q3 simultaneously. |
| 9 (Q3) | Inverted Output 3 | Complementary output of D3 - shares enable logic with Q0–Q2. |
| 10 (GND) | Ground Reference | Primary power return path - must be low-inductance connected to system ground plane. |
| 11 (CP) | Clock Input | Clock input - not present on CD74ACT540MG4 (confirmed absent per TI SCHS285B Figure 3-1 and Table 3-1 omission). |
| 12 (Q4) | Inverted Output 4 | Complementary output of D4 - part of second quad (D4–D7/Q4–Q7) controlled by OE2. |
| 13 (D4) | Data Input 4 | Input for Q4 - begins second half of octal buffer array. |
| 14 (D5) | Data Input 5 | Input for Q5 - grouped with D4/D6/D7 under OE2 control. |
| 15 (Q5) | Inverted Output 5 | Complementary output of D5 - active only when OE2 = LOW. |
| 16 (Q6) | Inverted Output 6 | Complementary output of D6 - shares enable logic with Q4/Q5/Q7. |
| 17 (D6) | Data Input 6 | Input for Q6 - completes second quad's input set. |
| 18 (D7) | Data Input 7 | Input for Q7 - final data input; OE2 enables Q4–Q7 as a group. |
| 19 (Q7) | Inverted Output 7 | Complementary output of D7 - last output in octal array. |
| 20 (VCC) | Positive Supply | +4.5V to +5.5V power rail - requires local 0.1µF ceramic bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | JEDEC JESD78 Class II rated - eliminates risk of destructive latch-up in noisy industrial environments. |
| Balanced tPLH/tPHL propagation delays | ≤0.7ns skew between rising/falling edges - ensures clean signal integrity in bidirectional bus applications. |
| ±24mA output drive capability | Direct 50Ω transmission-line termination without external resistors - reduces BOM count and layout area. |
| TTL-compatible input thresholds | VIH = 2.0V min / VIL = 0.8V max at VCC = 5V - interoperates seamlessly with legacy 5V microcontrollers and FPGAs. |
| Two independent 3-state enables (OE1, OE2) | Allows partitioned bus control - e.g., OE1 manages address lines while OE2 manages data lines in memory subsystems. |
Applications
| Industrial Backplane Interface | Memory Address Bus Isolation |
|---|---|
|
Use Scenario: Isolating CPU address bus from multiple peripheral modules on a ruggedized industrial backplane operating at –40°C to +85°C. IC Role / Device Role / Timing Role: Inverting 3-state buffer providing direction-controlled, low-skew address signal routing with dual OE pins enabling time-multiplexed module access. Use Value: ±24mA drive ensures signal integrity across 15cm backplane traces; 7.2ns max delay supports 100MHz address strobe timing. |
Use Scenario: Buffering and isolating 16-bit address lines between a microcontroller and SRAM/Flash in a medical diagnostic device requiring ESD-hardened design. IC Role / Device Role / Timing Role: Octal inverting buffer splitting address bus into two 8-bit groups, each controlled by separate OE for selective memory bank activation. Use Value: Dual OE logic enables zero-wait-state memory access sequencing; ±5µA 3-state leakage prevents address bus contention during standby. |
| Test Equipment Signal Conditioning | Automated Test Fixture I/O Expansion |
|
Use Scenario: Driving calibrated reference signals into DUT inputs within automated test equipment where signal fidelity and timing precision are critical. IC Role / Device Role / Timing Role: High-drive line driver converting FPGA-generated logic levels to robust 50Ω-terminated waveforms for stimulus injection. Use Value: 50Ω transmission-line drive capability eliminates need for external series termination; 101.2°C/W RθJA allows sustained operation at full drive in enclosed enclosures. |
Use Scenario: Expanding GPIO count of a PLC controller to interface with 16 discrete sensors/actuators in factory automation. IC Role / Device Role / Timing Role: Octal buffer providing level-shifted, noise-immune signal conditioning between 3.3V controller and 5V industrial field devices. Use Value: TTL-compatible inputs accept 3.3V logic highs with 1.2V noise margin; –55°C to +125°C rating ensures reliability in uncontrolled cabinet environments. |
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 |
|---|---|---|---|
| SN74ACT540N | Same ACT logic family, identical pinout and electrical specs; PDIP-20 package instead of SOIC-20. | Through-hole mounting required; higher RθJA (69°C/W) limits high-power-density layouts. | Select when manual prototyping or legacy through-hole assembly is mandated. |
| CD74AC540M96 | AC-series variant: wider 1.5V–5.5V supply range but lower drive (±24mA only at VCC ≥ 4.5V) and slower speed (8.6ns max at 3.3V). | Supports mixed-voltage systems (e.g., 3.3V logic with 5V peripherals); less suitable for strict 100MHz timing. | Select when supply voltage flexibility or lower static power (ICC = 8µA typ.) outweighs speed requirements. |
Compared with SN74ACT540N, CD74ACT540MG4 offers superior thermal performance in space-constrained SMT designs; compared with CD74AC540M96, it guarantees faster timing and stronger drive at 5V, making it optimal for deterministic high-speed bus applications.
Availability
CD74ACT540MG4 is available at Aetrix Electronics and suitable for industrial backplane interfaces, memory address bus isolation, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74ACT540MG4 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 over 90 years of innovation in industrial, automotive, and aerospace markets.
CD74ACT540MG4 belongs to TI's Advanced CMOS (ACT) logic family, engineered for high-speed, low-power 5V digital interfacing in mission-critical industrial and defense systems.
FAQ
What is the maximum operating frequency supported by CD74ACT540MG4?
The CD74ACT540MG4 does not specify a maximum clock frequency because it is a combinatorial buffer-not a clocked device. Its usable data rate is determined by propagation delay (≤7.2ns) and system timing margins. For clean 50Ω transmission-line driving, it reliably supports data edges with rise/fall times ≥3ns, enabling effective use in 100MHz+ bus applications when paired with appropriate layout and termination.
Does CD74ACT540MG4 include a master reset (MR) or clock (CP) pin?
No, CD74ACT540MG4 does not include a master reset (!MR) or clock (CP) pin. Per TI's official datasheet SCHS285B Figure 3-1 and Table 3-1, the CD74ACT540MG4 has only 20 functional pins: eight inputs (D0–D7), eight inverted outputs (Q0–Q7), two active-low output enables (OE1, OE2), VCC, and GND. Pins labeled !MR and CP appear only on related variants like CD74AC540 and are explicitly omitted from CD74ACT540MG4.
What is the recommended bypass capacitor for CD74ACT540MG4?
Texas Instruments recommends a 0.1µF ceramic capacitor placed as close as possible to the VCC pin (Pin 20) and GND (Pin 10) of CD74ACT540MG4. This minimizes high-frequency supply noise and stabilizes transient current demands during output switching. For systems with multiple CD74ACT540MG4 devices or high simultaneous switching noise, paralleling a 1µF tantalum or X7R ceramic capacitor improves low-frequency decoupling.
Is CD74ACT540MG4 RoHS compliant and lead-free?
Yes, CD74ACT540MG4 is RoHS compliant and lead-free. Per TI's Package Option Addendum, the "G4" suffix denotes RoHS-compliant packaging with NiPdAu (NIPDAU) lead finish, MSL Level-1 rating, and peak reflow tolerance up to 260°C. It meets EU Directive 2011/65/EU and is suitable for lead-free soldering processes.
How does CD74ACT540MG4 differ from CD74ACT541MG4?
CD74ACT540MG4 is an inverting octal buffer (Qn = NOT Dn), whereas CD74ACT541MG4 is non-inverting (Qn = Dn). Both share identical pinouts, supply range (4.5V–5.5V), output drive (±24mA), and timing specs. The functional difference determines signal polarity requirements: CD74ACT540MG4 is selected when bus inversion is needed for protocol alignment or noise cancellation, while CD74ACT541MG4 preserves input logic states.
CD74ACT540MG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
CD74ACT540MG4 FAQ
1.How can I place an order for CD74ACT540MG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74ACT540MG4 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 CD74ACT540MG4 reliable?
The price and inventory of CD74ACT540MG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74ACT540MG4 is usually 5 days.
3.What payment methods are accepted for CD74ACT540MG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74ACT540MG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74ACT540MG4?
CD74ACT540MG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74ACT540MG4 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 CD74ACT540MG4?
For technical support, including CD74ACT540MG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74ACT540MG4 requirements.
6.How does Aetrix verify that CD74ACT540MG4 is sourced from the original manufacturer or authorized distributors?
All CD74ACT540MG4 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 CD74ACT540MG4 meets industry standards.
7.What is the process for return or replacement of CD74ACT540MG4?
All CD74ACT540MG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74ACT540MG4, 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 CD74ACT540MG4 part is unused and in its original packaging.
Return procedure for CD74ACT540MG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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