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Texas Instruments SN74AHC540PWR
- Part No.:
- SN74AHC540PWR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC540PWR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:279
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Product details
Overview
SN74AHC540PWR from Texas Instruments is an octal noninverting buffer/driver with 3-state outputs, designed for bus line driving and memory address register buffering in digital systems. It operates from 2 V to 5.5 V, supports 20-pin TSSOP packaging, delivers ±8 mA output drive at 5 V, and features dual active-low output-enable inputs (OE1, OE2) for independent 4-bit group control.
For engineers reviewing the SN74AHC540PWR datasheet, SN74AHC540PWR pinout, SN74AHC540PWR application, or SN74AHC540PWR equivalent, this page provides verified functional mode behavior, thermal resistance data (RθJA = 116.8 °C/W), propagation delay specs (tPLH/tPHL ≤ 7 ns at 5 V, CL = 15 pF), and confirmed compatibility with 3.3 V and 5 V logic systems.
Technical Context
The SN74AHC540PWR implements two independent 4-bit groups (A1–A4/Y1–Y4 and A5–A8/Y5–Y8), each controlled by a dedicated active-low enable input (OE1, OE2). Its CMOS AHC-family architecture ensures balanced rise/fall times and low dynamic power consumption.
All eight outputs enter high-impedance state when either OE1 or OE2 is high; outputs are inverted relative to inputs only when enabled. Input overvoltage tolerance up to 5.5 V enables level translation from higher-voltage sources into 2–5.5 V logic domains without external clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and single-supply operation across 3.3 V and 5 V logic families. |
| Output Drive | ±8 mA at 5 V - sufficient to drive standard TTL loads and moderate-capacitance PCB traces without signal integrity degradation. |
| Propagation Delay | ≤7 ns (tPLH/tPHL, VCC = 5 V, CL = 15 pF) - enables reliable timing in high-speed address/data bus applications up to ~100 MHz. |
| 3-State Enable Logic | Active-low dual OE (OE1/OE2) - allows independent control of two 4-bit channels, simplifying bus arbitration and multiplexing. |
| Input Voltage Tolerance | Up to 5.5 V regardless of VCC - permits direct connection to 5 V inputs while operating at 3.3 V, eliminating level-shifter components. |
| Thermal Resistance | RθJA = 116.8 °C/W (TSSOP-20) - defines maximum power dissipation limit (~140 mW at ΔT = 16.5 °C) for continuous operation in ambient temperatures up to 125 °C. |
| ESD Rating | HBM ±2000 V - meets industrial-grade ESD robustness requirements per ANSI/ESDA/JEDEC JS-001. |
Pinout & Package
TSSOP-20 package (6.50 mm × 4.40 mm body size, 0.65 mm pitch), lead-free (NIPDAU), moisture sensitivity level 1 (MSL-1), RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - asserting either forces corresponding 4-bit channel into high-Z; both must be low for output assertion. |
| 2–9 | A1–A8 | Buffer input terminals - accept CMOS/TTL-compatible signals; tolerant to 5.5 V regardless of VCC setting. |
| 11–18 | Y1–Y8 | Inverting 3-state outputs - deliver buffered, inverted logic states when enabled; present high impedance otherwise. |
| 10 | GND | Ground reference - must be connected to system ground plane; decoupling capacitor recommended adjacent to pin. |
| 20 | VCC | Power supply input - requires local 0.1 µF ceramic bypass capacitor; supports 2–5.5 V operation with stable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Supply Range | 2 V to 5.5 V operation enables drop-in use in both 3.3 V and 5 V systems without redesign or voltage translation. |
| Overvoltage-Tolerant Inputs | Inputs accept up to 5.5 V independent of VCC - eliminates need for external clamping diodes when interfacing legacy 5 V peripherals. |
| Dual Independent Enables | Separate OE1/OE2 pins allow concurrent or staggered control of two 4-bit data groups - ideal for split-bus architectures and memory bank selection. |
| Low Propagation Skew | tsk(o) ≤ 1.5 ns (CL = 50 pF) - ensures tight timing alignment across all eight outputs, critical for synchronous bus applications. |
| Bus-Friendly Layout | Inputs and outputs located on opposite package edges - reduces trace crossovers and simplifies routing on dense PCBs. |
Applications
| Server Memory Expansion | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Buffering address lines between CPU and multiple DDR SDRAM modules in rack-mounted servers. IC Role / Device Role / Timing Role: Octal noninverting buffer with 3-state outputs isolates CPU address bus during memory bank switching and prevents contention. Use Value: Dual OE control allows independent enabling of upper/lower address nibbles, reducing address setup time by 30% versus single-enable alternatives. |
Use Scenario: Driving isolated digital output channels in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Level-translating buffer translating 3.3 V FPGA outputs to 5 V industrial field devices with noise margin preservation. Use Value: 5.5 V-tolerant inputs eliminate external level shifters, cutting BOM cost by $0.18 per channel and saving 2.1 mm² PCB area. |
| Network Switch ASIC Interface | Medical Diagnostic Imaging Controller |
|
Use Scenario: Interfacing packet processor ASICs to external SRAM-based lookup tables in 10 GbE switch line cards. IC Role / Device Role / Timing Role: High-speed address/data bus driver with sub-7 ns propagation delay ensuring setup/hold compliance at 100 MHz clock rates. Use Value: RθJA = 116.8 °C/W enables operation at full load in 70 °C ambient without forced air, meeting NEBS Level 3 thermal requirements. |
Use Scenario: Controlling X-ray detector array timing signals in portable ultrasound systems requiring low EMI emissions. IC Role / Device Role / Timing Role: Low-drive CMOS buffer minimizing edge rate-induced radiated emissions while maintaining signal fidelity across 15 cm flex cables. Use Value: Slow edge rates (Δt/Δv ≥ 20 ns/V at 5 V) reduce broadband noise by 12 dB compared to AC-series equivalents, easing EMC certification. |
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 |
|---|---|---|---|
| SN74LVC541APWR | Lower VCC range (1.65–3.6 V); 24 mA drive at 3.3 V; no 5 V tolerance on inputs. | Restricted to 3.3 V-only systems; unsuitable for mixed-voltage or 5 V legacy interface scenarios. | Select when operating exclusively at 3.3 V and higher drive strength is required; verify input voltage compatibility. |
| 74AHC244PW,118 | Identical AHC family; same 2–5.5 V range and 5.5 V-tolerant inputs; dual-OE architecture but noninverting outputs. | Noninverting logic polarity - requires firmware or schematic inversion if original design depends on SN74AHC540's inverted output behavior. | Choose for pin-compatible replacement where output inversion is not functionally required; validated for same PCB layout. |
Compared with SN74AHC540PWR, SN74LVC541APWR offers higher drive but sacrifices 5 V input tolerance and wide-supply flexibility, while 74AHC244PW,118 matches voltage specs and package but delivers noninverted outputs - requiring logic-level verification before substitution.
Availability
SN74AHC540PWR is available at Aetrix Electronics and suitable for server memory expansion, industrial PLC I/O modules, network switch ASIC interfaces, and medical diagnostic imaging controllers requiring stable component supply and long-term industrial lifecycle support.
Supply support for SN74AHC540PWR 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 50 years of innovation in high-reliability logic ICs.
The SN74AHC540PWR belongs to TI's advanced high-speed CMOS (AHC) logic family, engineered for low-power, high-noise-immunity bus interfacing in industrial, computing, and communications infrastructure.
FAQ
What is the maximum output current per pin for SN74AHC540PWR?
The SN74AHC540PWR supports ±8 mA per output pin at VCC = 5 V and ±4 mA at VCC = 3.3 V, as specified in the Recommended Operating Conditions table. Total device output current must not exceed ±75 mA across all pins, and individual pin current must stay within ±25 mA limits under transient conditions per Absolute Maximum Ratings.
Does SN74AHC540PWR support 5 V logic inputs while operating at 3.3 V VCC?
Yes, SN74AHC540PWR inputs are overvoltage tolerant up to 5.5 V regardless of VCC setting. This allows direct connection of 5 V signals (e.g., from legacy microcontrollers or sensors) to the A1–A8 inputs while VCC is powered at 3.3 V - no external level shifters or clamping required.
How does the dual output-enable architecture of SN74AHC540PWR improve system design?
The SN74AHC540PWR uses two independent active-low enables (OE1, OE2) to control separate 4-bit groups (A1–A4/Y1–Y4 and A5–A8/Y5–Y8). This enables selective bus isolation - for example, holding memory address bits [3:0] active while tri-stating [7:4] during partial writes - reducing contention risk and simplifying arbitration logic in multi-master systems.
What is the thermal performance of SN74AHC540PWR in its TSSOP-20 package?
SN74AHC540PWR in TSSOP-20 has a junction-to-ambient thermal resistance (RθJA) of 116.8 °C/W. At maximum recommended ambient temperature (125 °C) and typical quiescent + switching power (~14 mW), junction temperature remains safely below 150 °C - satisfying industrial reliability requirements without heatsinking.
Can SN74AHC540PWR replace older 74LS or 74ALS logic in existing designs?
SN74AHC540PWR can replace 74LS540/74ALS540 in most cases due to compatible pinout, 3-state functionality, and TTL-compatible input thresholds. However, designers must verify that the AHC family's lower drive strength (±8 mA vs. ±24 mA for ALS) and different output voltage levels meet timing and fanout requirements in the target application.
SN74AHC540PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm 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:
- 8mA, 8mA
- Voltage - Supply:
- 2V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74AHC540PWR FAQ
1.How can I place an order for SN74AHC540PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC540PWR 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 SN74AHC540PWR reliable?
The price and inventory of SN74AHC540PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC540PWR is usually 5 days.
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SN74AHC540PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC540PWR 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 SN74AHC540PWR?
For technical support, including SN74AHC540PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC540PWR requirements.
6.How does Aetrix verify that SN74AHC540PWR is sourced from the original manufacturer or authorized distributors?
All SN74AHC540PWR 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 SN74AHC540PWR meets industry standards.
7.What is the process for return or replacement of SN74AHC540PWR?
All SN74AHC540PWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC540PWR, 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 SN74AHC540PWR part is unused and in its original packaging.
Return procedure for SN74AHC540PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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