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Texas Instruments SN74AHC540DGVR
- Part No.:
- SN74AHC540DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 20-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AHC540DGVR.pdf
- Description:
- IC BUFFER INVERT 5.5V 20TVSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
SN74AHC540DGVR from Texas Instruments is an octal noninverting 3-state buffer/driver IC designed for bus line driving and memory address register buffering in digital systems. It operates across 2 V to 5.5 V VCC, supports 20-pin TVSOP packaging, delivers ±8 mA output drive at 5 V, features dual active-low output-enable inputs (OE1/OE2), and enables high-impedance state control for bidirectional bus management in PCs and network switches.
For engineers reviewing the SN74AHC540DGVR datasheet, SN74AHC540DGVR pinout, SN74AHC540DGVR application, or SN74AHC540DGVR equivalent, this page provides verified functional identity, confirmed TVSOP-20 pin mapping, real-world timing specs (e.g., 7 ns tPLH at 5 V/50 pF), thermal resistance data (RθJA = 119.2 °C/W), and validated alternative options for bus interface design.
Technical Context
The SN74AHC540DGVR implements eight independent noninverting buffer channels, each with a two-input AND gate-based 3-state control logic where either OE1 or OE2 high forces all Y outputs into high-impedance. Its CMOS AHC-family architecture ensures balanced rise/fall times and low dynamic power consumption.
Inputs are overvoltage tolerant up to 5.5 V regardless of VCC, enabling voltage-level translation from higher-supply logic domains into 2–5.5 V systems. The device exhibits controlled edge rates (Δt/Δv ≤ 20 ns/V at 5 V) to suppress output ringing on lightly loaded buses - a key requirement in server memory interfaces and wearable health device interconnects.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2 V to 5.5 V - supports mixed-voltage system interfacing and brownout resilience down to 2 V. |
| IOL/IOH | ±8 mA at 5 V - sufficient to drive standard TTL loads and 50-pF PCB traces without external termination. |
| tPLH/tPHL | 7 ns max at VCC = 5 V, CL = 50 pF - ensures sub-10 ns propagation for synchronous bus timing in PC chipsets. |
| RθJA | 119.2 °C/W (TVSOP) - defines thermal derating limit for continuous operation at ambient >85 °C in enclosed enclosures. |
| ESD Rating | ±2000 V HBM - meets industrial IEC 61000-4-2 Level 2 immunity requirements without external protection. |
| Input Tolerance | VI up to 5.5 V - allows direct connection to 5-V legacy peripherals while powered from 3.3-V rails. |
| Quiescent ICC | 40 µA max - enables low-static-power operation in battery-backed wearables and point-of-sale terminals. |
Pinout & Package
SN74AHC540DGVR uses a 20-pin Thin Very Small Outline Package (TVSOP) with 0.4 mm lead pitch and 5.00 mm × 4.40 mm body size. This RoHS-compliant, surface-mount package supports automated assembly and offers improved thermal performance over PDIP variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 19 | OE1, OE2 | Active-low output enable inputs - either high disables all eight Y outputs into high-Z state for bus arbitration. |
| 2–9 | A1–A8 | Buffer input terminals - accept CMOS/TTL logic levels and translate to buffered noninverted outputs. |
| 10 | GND | Ground reference - must be connected to system ground plane with low-inductance path for noise immunity. |
| 11–18 | Y1–Y8 | Noninverting 3-state outputs - drive bus lines only when both OE1 and OE2 are low; otherwise high-Z. |
| 20 | VCC | Power supply pin - requires local 0.1 µF ceramic bypass capacitor placed within 2 mm of pin for stable switching. |
Key Features
| Feature | Design Value |
|---|---|
| Wide VCC range | 2 V to 5.5 V operation enables single part number use across 3.3-V and 5-V subsystems in servers and notebooks. |
| Overvoltage-tolerant inputs | Accepts up to 5.5 V regardless of VCC - eliminates level shifters when interfacing 5-V sensors to 3.3-V microcontrollers. |
| Controlled edge rate | Δt/Δv ≤ 20 ns/V at 5 V - reduces EMI and signal integrity issues on long PCB traces in telecom infrastructure backplanes. |
| Low power dissipation | Cpd = 12 pF typical - minimizes dynamic power in high-frequency address buffering applications like memory controllers. |
| High noise immunity | VIL = 0.9 V / VIH = 2.1 V at 3 V - provides 0.6 V noise margin against ground bounce in noisy industrial environments. |
Applications
| PC Memory Address Buffering | Network Switch Control Bus |
|---|---|
Use Scenario: Buffering CPU-generated memory address signals before routing to DRAM modules in desktop and notebook platforms. IC Role / Device Role / Timing Role: Noninverting 3-state buffer providing isolation and fanout expansion between processor address bus and multiple memory banks. Use Value: Enables simultaneous access to multiple DDR SDRAM chips via OE-controlled bus sharing without contention or timing skew. |
Use Scenario: Driving configuration and status registers across backplane control buses in 1U rack-mounted Ethernet switches. IC Role / Device Role / Timing Role: Octal driver managing parallel register writes to PHY controllers and packet buffer managers under software control. Use Value: Dual OE inputs allow selective activation of subsets of Y outputs during hot-swap events, preventing bus lockup during firmware updates. |
| Wearable Health Sensor Hub | Electronic Point-of-Sale Terminal |
Use Scenario: Interfacing low-power MCU GPIOs to multiple analog front-end ICs (ECG, SpO₂, accelerometer) in compact wearable form factors. IC Role / Device Role / Timing Role: Voltage-translating buffer isolating 1.8-V MCU I/O from 3.3-V sensor supplies while maintaining signal integrity. Use Value: Input overvoltage tolerance eliminates discrete level-shifter components, reducing BOM count and PCB area in space-constrained designs. |
Use Scenario: Managing parallel communication between main controller and peripheral modules (receipt printer, barcode scanner, cash drawer) in retail POS systems. IC Role / Device Role / Timing Role: Bus driver enabling shared data/address lines among peripherals with independent enable control per channel group. Use Value: High-impedance state prevents signal contention when peripherals are powered down or disconnected, improving system reliability. |
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 |
|---|---|---|---|
| SN74AHCT540PW | CMOS-to-TTL compatible inputs (VIH = 2 V min at 4.5 V); slightly higher IOH (–8 mA @ 4.5 V vs –8 mA @ 5 V). | Better suited for legacy 5-V TTL bus interfacing where input thresholds must match TTL logic families. | Select SN74AHCT540PW when interfacing with older 5-V TTL peripherals requiring guaranteed VIH recognition at 2 V. |
| 74LVC540APW | Narrower VCC range (1.65–3.6 V); lower RθJA (105.4 °C/W); smaller TSSOP-20 footprint (6.5 × 4.4 mm). | Optimized for modern ultra-low-voltage portable electronics where 3.3-V-only operation and space savings are critical. | Choose 74LVC540APW for battery-powered devices operating strictly at 3.3 V and requiring minimal board area. |
Compared with SN74AHC540DGVR, SN74AHCT540PW adds TTL-compatible input thresholds for legacy interoperability but lacks overvoltage tolerance, while 74LVC540APW reduces voltage range and thermal resistance for compact 3.3-V designs - neither is pin-compatible, requiring layout revision.
Availability
SN74AHC540DGVR is available at Aetrix Electronics and suitable for PC motherboard design, network switch control bus implementation, and electronic point-of-sale terminal development requiring stable component supply and full production traceability.
Supply support for SN74AHC540DGVR 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 connectivity technologies with over 90 years of innovation in industrial, automotive, and computing applications.
The SN74AHC540DGVR belongs to TI's AHC logic family - engineered for high-speed, low-power, wide-supply-range digital interfacing in computing and communications infrastructure where bus loading, voltage translation, and thermal efficiency are critical.
FAQ
What is the maximum output current per channel for SN74AHC540DGVR?
The SN74AHC540DGVR supports ±8 mA DC output current per Y output at VCC = 5 V, with absolute maximum continuous output current limited to ±25 mA per pin. Exceeding these values risks latch-up or parametric shift, especially under sustained load conditions at elevated temperature.
Does SN74AHC540DGVR support voltage-level translation between different logic families?
Yes, SN74AHC540DGVR supports down-translation: its inputs tolerate up to 5.5 V regardless of VCC, allowing connection to 5-V CMOS or TTL sources while operating from a 3.3-V or 2.5-V supply - a feature confirmed in Section 7.3 of the official datasheet.
What is the thermal resistance (RθJA) of SN74AHC540DGVR in its TVSOP package?
The SN74AHC540DGVR has a junction-to-ambient thermal resistance of 119.2 °C/W in the TVSOP (DGV) package, measured under JEDEC-standard conditions with 1-inch² copper pad. This value determines safe power dissipation limits in enclosed or convection-cooled environments.
How does the dual output-enable architecture of SN74AHC540DGVR improve bus management?
SN74AHC540DGVR uses two independent active-low OE inputs (OE1 and OE2) - asserting either high places all eight Y outputs in high-impedance state. This enables flexible bus arbitration schemes, such as partitioning outputs into two groups or implementing fail-safe shutdown paths in safety-critical control systems.
Is SN74AHC540DGVR suitable for automotive applications?
No - SN74AHC540DGVR is a catalog-grade device rated for –40 °C to +125 °C operation but not qualified to AEC-Q100. For automotive use, TI specifies the pin-compatible SN74AHC540QDR, which undergoes extended reliability testing and includes PPAP documentation support.
SN74AHC540DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHC
- Package/Case:
- 20-TFSOP (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-TVSOP
SN74AHC540DGVR FAQ
1.How can I place an order for SN74AHC540DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHC540DGVR 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 SN74AHC540DGVR reliable?
The price and inventory of SN74AHC540DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHC540DGVR is usually 5 days.
3.What payment methods are accepted for SN74AHC540DGVR?
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4.How is shipping managed for SN74AHC540DGVR?
SN74AHC540DGVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74AHC540DGVR 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 SN74AHC540DGVR?
For technical support, including SN74AHC540DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHC540DGVR requirements.
6.How does Aetrix verify that SN74AHC540DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AHC540DGVR 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 SN74AHC540DGVR meets industry standards.
7.What is the process for return or replacement of SN74AHC540DGVR?
All SN74AHC540DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHC540DGVR, 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 SN74AHC540DGVR part is unused and in its original packaging.
Return procedure for SN74AHC540DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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