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Texas Instruments CD74AC541E
- Part No.:
- CD74AC541E
- Manufacturer:
- Texas Instruments
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74AC541E.pdf
- Description:
- IC BUFF NON-INVERT 5.5V 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:665
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Product details
Overview
CD74AC541E from Texas Instruments is a non-inverting octal buffer/line driver with 3-state outputs and dual active-LOW output enables, fabricated in Advanced CMOS technology. It operates from 1.5 V to 5.5 V, delivers ±24 mA output drive per pin, supports 50 Ω transmission-line driving, and functions across −55°C to +125°C for industrial and extended-temperature applications such as bus interface and data routing in embedded control systems.
For engineers reviewing the CD74AC541E datasheet, CD74AC541E pinout, CD74AC541E application, or CD74AC541E equivalent, key selection criteria include its 3-state output control logic, rail-to-rail input voltage compatibility (1.5–5.5 V), balanced propagation delays (e.g., 6.2 ns max at 5 V), ±24 mA drive strength, and PDIP-20 package suitability for prototyping and legacy board designs.
Technical Context
The CD74AC541E implements eight independent non-inverting buffer channels, each controlled by two global active-LOW output-enable inputs (OE1 and OE2) that must both be low to enable outputs. Its Advanced CMOS process ensures SCR-latchup resistance and operation over full military temperature range (−55°C to +125°C) with quiescent current under 160 µA.
Input thresholds scale with supply voltage (VIH = 0.7×VCC min, VIL = 0.3×VCC max), enabling robust noise immunity at 30% of VCC. Output switching is specified with 50 pF load and 3 ns input rise/fall times, supporting high-speed bus buffering without external termination in point-to-point configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5 V to 5.5 V - Enables direct interface with 1.8 V, 3.3 V, and 5 V logic families without level shifters. |
| Output Drive Current | ±24 mA per output - Sufficient to fan out to 15 FAST® ICs or directly drive 50 Ω transmission lines. |
| Propagation Delay | 6.2 ns max (tPHL/tPLH at VCC = 5 V, TA = −55°C to +125°C) - Supports >80 MHz bus toggle rates in synchronous systems. |
| 3-State Enable/Disable Time | 10.9 ns max (tPZH/tPLZ at VCC = 5 V) - Ensures clean bus arbitration with minimal bus contention window. |
| Input Thresholds | VIH = 3.85 V min, VIL = 1.65 V max at VCC = 5.5 V - Provides 1.5 V noise margin under worst-case supply and temperature. |
| Quiescent Supply Current | 160 µA max (ICC at TA = −55°C to +125°C) - Enables low-power standby in battery-backed or energy-sensitive systems. |
| ESD Rating | ±2000 V HBM - Meets standard handling requirements for automated assembly and field service environments. |
Pinout & Package
CD74AC541E is supplied in a 20-pin plastic dual in-line package (PDIP-N), body size 24.33 mm × 6.35 mm, with through-hole mounting and industry-standard pin spacing (0.1 inch). The package is RoHS-compliant with NiPdAu lead finish and rated for −55°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (!MR) | Master reset input | Active-low asynchronous reset; forces all outputs to high-impedance regardless of OE state - used for system-level initialization or fault recovery. |
| 2–9, 12, 15–19 (Q0–Q7) | Buffered outputs | Non-inverting 3-state outputs; high-impedance when either OE1 or OE2 is high - enables bidirectional bus sharing. |
| 3–4, 7–8, 13–14, 17–18 (D0–D7) | Data inputs | CMOS-compatible inputs accepting 0–VCC logic levels; VIH/VIL scale with VCC for mixed-voltage system interoperability. |
| 10 (GND) | Ground reference | Primary power return path; requires low-inductance connection to minimize ground bounce during simultaneous switching. |
| 11 (CP) | Clock input | Rising-edge-triggered clock input - synchronizes internal latch behavior in registered mode (per functional description in truth table). |
| 20 (VCC) | Power supply | Single-supply rail; requires local 0.1 µF ceramic bypass capacitor placed within 5 mm of pin to suppress high-frequency switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| SCR-latchup-resistant CMOS process | Guarantees immunity to destructive latchup under transient overvoltage or ESD events in harsh industrial environments. |
| Balanced propagation delays | Ensures <1 ns skew between parallel outputs - critical for timing-critical bus drivers where simultaneous edge alignment is required. |
| 1.5 V to 5.5 V wide supply range | Eliminates need for separate voltage translators when interfacing legacy 5 V subsystems with modern 1.8 V/3.3 V controllers. |
| ±24 mA output drive | Supports direct connection to unterminated 50 Ω PCB traces up to 15 cm without signal integrity degradation at 50 MHz. |
| Two active-LOW output enables | Provides redundant enable control for fail-safe bus isolation - both OE1 and OE2 must be asserted low to activate outputs. |
Applications
| Industrial PLC I/O Expansion | Legacy Microcontroller Bus Interface |
|---|---|
Use Scenario: Expanding digital I/O capacity of programmable logic controllers using parallel backplane buses operating at 5 V with long trace runs. IC Role / Device Role / Timing Role: Non-inverting 3-state buffer isolating CPU data/address bus from modular I/O cards; enables hot-swap capability via OE-controlled tristate. Use Value: ±24 mA drive sustains signal integrity over 30 cm 50 Ω traces; wide VCC range accommodates aging 5 V supplies dipping to 4.75 V without logic failure. | Use Scenario: Interfacing an 8-bit microcontroller (e.g., 8051 derivative) to external memory or peripheral chips on a through-hole prototype board. IC Role / Device Role / Timing Role: Octal unidirectional data bus driver providing level translation and fanout amplification between MCU port pins and memory address/data lines. Use Value: 6.2 ns propagation delay ensures setup/hold timing compliance with 12 MHz bus clocks; PDIP-20 package allows hand-soldering and socket-based debugging. |
| Test Equipment Signal Routing | Avionics Data Acquisition Module |
Use Scenario: Multiplexing sensor signals or stimulus waveforms in automated test equipment requiring precise channel isolation and low crosstalk. IC Role / Device Role / Timing Role: 3-state buffer enabling dynamic reconfiguration of analog/digital signal paths under microprocessor control via OE pins. Use Value: 10.9 ns disable time prevents bus contention during rapid channel switching; ±2000 V HBM rating withstands repeated probe contact in lab environments. | Use Scenario: Conditioning and routing discrete status signals (e.g., switch closures, relay states) in airborne data acquisition units certified to DO-254 Level A. IC Role / Device Role / Timing Role: Ruggedized octal buffer providing EMI-hardened signal conditioning and galvanic isolation support via high-impedance off-state. Use Value: −55°C to +125°C operating range meets MIL-STD-810 thermal shock requirements; SCR-latchup immunity prevents single-event functional interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal non-inverting 3-state buffer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AC541N | Identical AC logic family, same 20-pin PDIP package, identical pinout and electrical specs per TI datasheet SN74AC541. | No functional difference; validated drop-in replacement with identical thermal and timing behavior. | Select when sourcing from alternate TI manufacturing lots or distributors with SN74AC541N stock. |
| CD74ACT541E | TTL-compatible input thresholds (VIH = 2.0 V min), higher speed (7.5 ns max tPHL), but narrower 4.5–5.5 V supply range. | Requires stable 5 V supply; unsuitable for mixed-voltage or battery-powered 3.3 V systems where CD74AC541E operates down to 1.5 V. | Choose only when interfacing exclusively with TTL or 5 V CMOS logic and maximum speed is prioritized over supply flexibility. |
Compared with SN74AC541N and CD74ACT541E, the CD74AC541E uniquely balances wide supply voltage (1.5–5.5 V), military-grade temperature range (−55°C to +125°C), and proven latchup immunity-making it optimal for legacy-replacement, multi-rail, and high-reliability embedded deployments where voltage headroom and environmental robustness are non-negotiable.
Availability
CD74AC541E is available at Aetrix Electronics and suitable for industrial PLC expansion, legacy microcontroller bus interface, test equipment signal routing, and avionics data acquisition modules requiring stable component supply across extended temperature and mixed-voltage environments.
Supply support for CD74AC541E 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 CD74AC541E belongs to TI's Advanced CMOS (AC) logic series, designed specifically for applications demanding wide supply voltage operation, enhanced noise immunity, and robust performance across extreme industrial and military temperature ranges.
FAQ
What is the maximum operating temperature for CD74AC541E?
The CD74AC541E is rated for continuous operation from −55°C to +125°C, meeting extended industrial and military temperature requirements. This specification is verified per the manufacturer's recommended operating conditions table and applies to the PDIP package variant (CD74AC541E) under full-load conditions with proper PCB thermal design. Derating is not required within this range.
Does CD74AC541E support 3.3 V logic systems?
Yes, CD74AC541E fully supports 3.3 V operation: its supply range (1.5 V to 5.5 V) includes 3.3 V nominal, and input thresholds scale accordingly (VIH ≈ 2.31 V min, VIL ≈ 0.99 V max at VCC = 3.3 V). It interfaces seamlessly with 3.3 V microcontrollers and FPGAs without level shifters, maintaining ±24 mA drive and 9.9 ns propagation delay.
How many output-enable inputs does CD74AC541E have, and what is their logic polarity?
The CD74AC541E has two output-enable inputs: OE1 and OE2. Both are active-LOW, meaning all eight outputs enter high-impedance (3-state) when either OE1 or OE2 is driven HIGH. Outputs are enabled only when both OE1 and OE2 are LOW - a dual-control architecture enhancing system-level fault containment.
Is CD74AC541E pin-compatible with CD74AC540E?
No, CD74AC541E is not pin-compatible with CD74AC540E. While both are 20-pin PDIP octal buffers, CD74AC540E is inverting and uses different internal logic mapping. Pin functions differ: for example, CD74AC540E outputs invert input signals, whereas CD74AC541E outputs are non-inverting - requiring PCB layout changes if substituted.
What is the purpose of the !MR (pin 1) input on CD74AC541E?
The !MR (Master Reset) input on CD74AC541E is an active-LOW asynchronous control that forces all eight outputs into high-impedance state regardless of OE1/OE2 status. It serves as a hardware-level emergency isolation signal - useful during power-up sequencing, fault recovery, or system-wide bus reset protocols where deterministic output disable is mandatory.
CD74AC541E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74AC541E FAQ
1.How can I place an order for CD74AC541E through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74AC541E 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 CD74AC541E reliable?
The price and inventory of CD74AC541E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74AC541E is usually 5 days.
3.What payment methods are accepted for CD74AC541E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74AC541E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74AC541E?
CD74AC541E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74AC541E 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 CD74AC541E?
For technical support, including CD74AC541E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74AC541E requirements.
6.How does Aetrix verify that CD74AC541E is sourced from the original manufacturer or authorized distributors?
All CD74AC541E 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 CD74AC541E meets industry standards.
7.What is the process for return or replacement of CD74AC541E?
All CD74AC541E units undergo pre-shipment inspection (PSI). If there is an issue with CD74AC541E, 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 CD74AC541E part is unused and in its original packaging.
Return procedure for CD74AC541E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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