SN74AHC540PWR-P Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The SN74AHC540PWR-P is a Texas Instruments 8-channel inverting buffer with 3-state outputs, operating from 2 V to 5.5 V supply in a 20-pin TSSOP package with propagation delay under 10 ns. Available in stock worldwide with competitive pricing.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- ACTIVE
- Datasheet
- SN74AHC540PWR-P Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 8-channel inverting buffer with 3-state outputs enabling bus isolation and direction control in multi-master designs
- 2 V to 5.5 V supply range for mixed-voltage logic interfacing between 3.3 V and 5 V digital systems
- AHC technology delivering sub-10 ns propagation delay with CMOS input levels for high-speed data bus buffering
Applications
The SN74AHC540PWR-P is used to buffer and invert 8-bit data bus signals between microcontrollers and memory or peripheral devices operating at different logic levels. Its 3-state outputs allow multiple bus masters to share a single data bus without contention when proper enable sequencing is applied. The device also serves as an address bus buffer in FPGA-based systems and as an output stage expander for GPIO-limited microcontrollers driving LED arrays.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for SN74AHC540PWR-P:
Bus Driver, AHC/VHC/H/U/V Series, 1-Func, 8-Bit, Inverted Output, CMOS, PDSO20
Frequently Asked Questions
What supply voltage range does SN74AHC540PWR-P support, and how does it enable 3.3 V to 5 V logic interfacing?
The SN74AHC540PWR-P operates from 2 V to 5.5 V, allowing it to be powered from a 3.3 V or 5 V rail while its CMOS input thresholds accept logic levels from either domain. When the device is powered at 5 V, it translates 3.3 V input signals to 5 V output levels, bridging the 8 data lines between a 3.3 V microcontroller and a 5 V peripheral in a single package.
How do the 3-state outputs of SN74AHC540PWR-P work in a shared data bus architecture with multiple bus masters?
The 3-state output enable pin (active low OE) places all 8 outputs into a high-impedance state when deasserted, disconnecting the buffer from the bus. In a system with 2 bus masters, each master drives one SN74AHC540PWR-P, and arbitration logic ensures only one OE is asserted at a time, preventing bus contention across all 8 data lines simultaneously.
What is the propagation delay of SN74AHC540PWR-P, and does it meet timing requirements for 50 MHz bus designs?
AHC-family buffers like the SN74AHC540PWR-P have a typical propagation delay of 5 ns to 8 ns at 3.3 V supply, well below the 10 ns half-period of a 50 MHz bus clock. This leaves over 2 ns of timing margin even after accounting for PCB trace delay of roughly 1.5 ns per 30 cm, making it suitable for 50 MHz address and data bus buffering in embedded systems.
For a 20-pin TSSOP PCB layout, how should decoupling be applied to SN74AHC540PWR-P to minimize switching noise on the supply rail?
Place a 100 nF ceramic capacitor as close as possible to the VCC pin, within 2 mm, to supply the instantaneous current drawn when all 8 outputs switch simultaneously. For high-speed designs above 20 MHz, adding a 10 nF capacitor in parallel further reduces high-frequency impedance above 100 MHz, keeping supply noise below 50 mV and preventing glitches on adjacent logic.
When should SN74AHC540PWR-P be chosen over SN74AHC244 in a data bus buffer design?
Choose SN74AHC540PWR-P when the application needs signal inversion along with buffering, since it inverts all 8 channels, while SN74AHC244 is a non-inverting buffer. If the downstream logic requires active-low data (for example, certain memory chips with inverted data bus conventions) and the upstream source drives active-high, the SN74AHC540PWR-P eliminates the need for separate inverter gates, saving 1 to 2 additional ICs in the design.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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