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Texas Instruments CD74AC541M
- Part No.:
- CD74AC541M
- Manufacturer:
- Texas Instruments
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74AC541M.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,144
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Product details
Overview
CD74AC541M from Texas Instruments is a non-inverting octal 3-state buffer/line driver in SOIC-20 package, operating from 1.5V to 5.5V with ±24mA output drive, balanced propagation delays (e.g., 7.1ns max at 5V), and SCR-latchup-resistant CMOS design. It serves as a bidirectional bus interface or data path isolator in industrial control backplanes and legacy microprocessor address/data buffers.
For engineers reviewing the CD74AC541M datasheet, CD74AC541M pinout, CD74AC541M application, or CD74AC541M equivalent, key selection criteria include its dual active-low output enables (OE1/OE2), 3-state output capability for bus sharing, 50Ω transmission-line drive compliance, and operation across −55°C to +125°C temperature range.
Technical Context
The CD74AC541M implements eight independent non-inverting buffer channels, each controlled by two shared active-low 3-state enable inputs (OE1 and OE2). Its RCA Advanced CMOS process delivers bipolar FAST®-class speed with CMOS power efficiency - e.g., 7.1ns max tPHL at VCC = 5V, TA = −55°C to +125°C.
Input thresholds scale with supply voltage (VIH = 0.7×VCC min at 3V; 3.85V at 5.5V), and output drive meets 50Ω transmission-line requirements per TI test conditions (−40°C to +85°C) and 75Ω at +125°C. Quiescent ICC is ≤160µA over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 1.5V to 5.5V - supports mixed-voltage system interfacing (e.g., 3.3V logic driving 5V bus) |
| Output Drive | ±24mA - drives 15 FAST® ICs or terminates 50Ω transmission lines without external resistors |
| Propagation Delay | 7.1ns max (tPHL, VCC = 5V, TA = −55°C to +125°C) - ensures timing-critical bus buffering in real-time controllers |
| 3-State Enable | Two active-low OE inputs (OE1, OE2) - enables synchronous bus arbitration with ANDed enable logic |
| Operating Temp | −55°C to +125°C - qualified for extended industrial and military-grade embedded systems |
| ESD Rating | ±2000V HBM - withstands handling in uncontrolled assembly environments without special ESD protocols |
| Power Dissipation Cap | 60pF typical - enables accurate dynamic power estimation in high-frequency switching applications |
Pinout & Package
CD74AC541M is supplied in a 20-pin SOIC (DW) package measuring 12.8mm × 10.3mm (including pins), with body size 12.8mm × 7.5mm. Pin 1 is located at the top-left corner of the package, marked by a beveled edge or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (!MR) | Master reset input | Active-low global reset - forces all outputs to high-impedance regardless of OE state |
| 2 (Q0)–9 (Q3), 12 (Q4)–19 (Q7) | Buffered outputs | Non-inverting outputs - reflect D0–D7 when OE1=OE2=L; high-Z otherwise |
| 3 (D0)–4 (D1), 7 (D2)–8 (D3), 13 (D4)–14 (D5), 17 (D6)–18 (D7) | Data inputs | Eight independent inputs - accept TTL/CMOS logic levels across full VCC range |
| 10 (GND) | Ground reference | Primary return path - must be low-inductance connection to minimize ground bounce during simultaneous switching |
| 11 (CP) | Clock input | Rising-edge-triggered clock - synchronizes internal latching (per truth table behavior) |
| 20 (VCC) | Supply rail | Single positive supply - requires local 0.1µF bypass capacitor per TI layout guidelines |
| OE1, OE2 (pins 1 & ?) | Output enable controls | Both must be LOW to enable outputs - provides redundancy for fault-tolerant bus control |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup resistance | Guaranteed immunity to latch-up under I/O stress per JEDEC JESD78, enabling robust operation in noisy industrial environments |
| Balanced propagation delays | Matched tPLH/tPHL (≤0.9ns skew at 5V) - preserves signal integrity in parallel data paths like address buses |
| 1.5V–5.5V operation | Single-supply compatibility across 1.8V, 3.3V, and 5V logic families - eliminates level-shifter requirements in mixed-voltage systems |
| ±24mA drive strength | Sufficient to directly drive unterminated 50Ω PCB traces up to 15cm - reduces need for external termination networks |
| 3-state leakage current | ≤±10µA at VCC = 5.5V, TA = −55°C to +125°C - minimizes standby power in battery-backed systems |
Applications
| Industrial Backplane Interface | Legacy Microprocessor Bus Buffer |
|---|---|
Use Scenario: Isolating CPU address/data lines from peripheral expansion slots in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer providing bidirectional bus isolation with synchronized OE control. Use Value: Enables hot-swap capability and prevents bus contention during module insertion/removal without additional logic. | Use Scenario: Driving Z80 or 8086 address latches in retro-computing or educational development boards. IC Role / Device Role / Timing Role: Octal line driver translating TTL-compatible signals to higher-current CMOS levels. Use Value: Meets 50Ω transmission-line drive spec at 4MHz bus speeds, eliminating ringing on 10cm traces. |
| Automotive ECU Diagnostic Port | Test Equipment Signal Conditioning |
Use Scenario: Level-shifting and buffering K-Line (ISO 9141) diagnostic signals between microcontroller UART and vehicle harness. IC Role / Device Role / Timing Role: Voltage-tolerant buffer supporting 1.5V–5.5V operation to interface 3.3V MCU with 12V-biased diagnostic line. Use Value: Withstands automotive load-dump transients via SCR-latchup-resistant process and operates reliably at −40°C to +125°C. | Use Scenario: Conditioning digital stimulus signals in automated test equipment before routing to DUT inputs. IC Role / Device Role / Timing Role: High-speed 3-state buffer enabling multiplexed signal routing across multiple test channels. Use Value: Balanced propagation delays ensure <1ns skew across all 8 channels, critical for time-aligned multi-channel testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC541N | Same AC logic family, PDIP-20 package; identical electrical specs but different thermal resistance (RθJA = 69°C/W vs. 101.2°C/W for SOIC) | Preferred for prototyping or through-hole assembly; lacks SOIC's space savings and reflow compatibility | Select SN74AC541N when manual soldering or breadboarding is required; verify board-level thermal margin due to lower RθJA. |
| CD74ACT541M | TTL-compatible input thresholds (VIH = 2.0V min), faster propagation (6.2ns max at 5V), but narrower supply range (4.5V–5.5V only) | Optimized for 5V-only systems with legacy TTL inputs; unsuitable for 3.3V or mixed-voltage interfaces | Choose CD74ACT541M only when interfacing exclusively with TTL sources and strict 6ns timing budgets apply. |
Compared with SN74AC541N and CD74ACT541M, CD74AC541M uniquely balances wide supply voltage (1.5V–5.5V), industrial temperature range (−55°C to +125°C), and SOIC packaging - making it optimal for space-constrained, mixed-voltage embedded systems requiring long-term reliability.
Availability
CD74AC541M is available at Aetrix Electronics and suitable for industrial control backplanes, legacy microprocessor bus interfaces, automotive diagnostic ports, and test equipment signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for CD74AC541M 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.
CD74AC541M belongs to TI's Advanced CMOS (AC) logic portfolio, designed specifically for industrial and military applications demanding wide voltage operation, latchup immunity, and extended temperature performance without sacrificing speed.
FAQ
What is the maximum operating temperature for CD74AC541M?
The CD74AC541M is rated for operation from −55°C to +125°C, meeting extended industrial and military-grade environmental requirements. This specification is validated per TI's recommended operating conditions in Section 4.3 of the SCHS285B datasheet and applies to the SOIC (DW) package variant.
Does CD74AC541M support 3.3V logic interfacing?
Yes, CD74AC541M fully supports 3.3V operation: VIH(min) = 2.1V and VIL(max) = 0.9V at VCC = 3.3V, ensuring reliable recognition of standard 3.3V CMOS/TTL logic levels. Its 1.5V–5.5V supply range makes it compatible with both 3.3V and 5V systems without level shifters.
How many output enable inputs does CD74AC541M have?
CD74AC541M has two active-low output enable inputs: OE1 and OE2. Both must be driven LOW simultaneously to enable the eight non-inverting outputs; if either is HIGH, all outputs enter high-impedance state. This dual-enable architecture supports redundant control and bus arbitration logic.
Is CD74AC541M pin-compatible with CD74ACT541M?
Yes, CD74AC541M and CD74ACT541M share identical pinout, package (SOIC-20), and functional block diagram. However, they differ electrically: CD74ACT541M uses TTL-compatible input thresholds and requires 4.5V–5.5V supply, while CD74AC541M supports 1.5V–5.5V and CMOS input thresholds.
What is the purpose of the !MR (Master Reset) pin on CD74AC541M?
The !MR pin on CD74AC541M is an active-low master reset that forces all outputs into high-impedance state regardless of OE1/OE2 status. It provides fail-safe bus isolation during power-up sequencing or system fault recovery, and is distinct from the 3-state enable function.
CD74AC541M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- 1.5V ~ 5.5V
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74AC541M FAQ
1.How can I place an order for CD74AC541M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC541M 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 CD74AC541M reliable?
The price and inventory of CD74AC541M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC541M is usually 5 days.
3.What payment methods are accepted for CD74AC541M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC541M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC541M?
CD74AC541M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC541M 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 CD74AC541M?
For technical support, including CD74AC541M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC541M requirements.
6.How does Aetrix verify that CD74AC541M is sourced from the original manufacturer or authorized distributors?
All CD74AC541M 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 CD74AC541M meets industry standards.
7.What is the process for return or replacement of CD74AC541M?
All CD74AC541M units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC541M, 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 CD74AC541M part is unused and in its original packaging.
Return procedure for CD74AC541M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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