SN74AHC540PWR

SN74AHC540PWR is an 8‑bit, noninverting buffer/line driver with two 4‑bit tri‑state enables (G1, G2). It provides eight buffers from D0–D7 to Q0–Q7. The enables allow bus sharing: when a group enable is active, its four outputs drive; when inactive, those outputs go to high impedance. It belongs to the AHC family—high‑speed CMOS with low power; it operates from 2.0 V to 5.5 V and accepts standard CMOS/TTL input levels. The device offers typical drive suitable for buffering data across microcontrollers, DSPs, or memory interfaces, with modest propagation delay. The PWR suffix indicates a PowerPAD package with an exposed thermal pad for improved heat dissipation (ground recommended). Common applications include data‑bus buffering, level shifting, and fan‑out expansion in mixed‑voltage systems.

Equivalents (8-bit buffer/3-state, noninverting):
- 74AHC540 (Nexperia), including 74AHC540PW/N variants
- SN74HC540, SN74HCT540, SN74ACT540 (TI)
- MC74AHC540 (ON Semiconductor)
- uPD74AHC540 (Renesas)
- 74LVC540 (Nexperia/ON Semi)
Note: check Vcc range, speed, and 3-state control behavior for your design; packaging/pinout may vary.

SN74AHC540PWR features:
- Octal (8-bit) noninverting buffer/driver with tri-state outputs
- Single output-enable (OE) controls all 8 outputs (3-state)
- Ioff support for partial-power-down (no back-powering when Vcc=0)
- Wide power-supply range: 2.0 V to 5.5 V
- High-speed CMOS (AHC) with low static power
- TTL/CMOS input level compatibility
- Pb-free, RoHS-compliant (PWR) variant
- Available in small-footprint packages (e.g., SOIC, TSSOP, etc.)

- Pin count: 20 pins (DIP-20 / SO-20 package)
- Function: Octal buffer/driver with 3-state outputs. It provides eight non-inverting buffers from A1–A8 to Y1–Y8, with a single output-enable input G that tri-states the outputs when not asserted. Includes Vcc and GND pins.

Manufacturer: Texas Instruments (TI).
TI is an American multinational semiconductor company that designs and manufactures integrated circuits and related products, with a focus on analog, embedded processing, and digital ICs. It is headquartered in Dallas, Texas, and is one of the world’s largest semiconductor manufacturers.

SN74AHC540PWR is an 8-bit buffer/driver with tri-state outputs (two enables). Common applications:
- Data/address bus buffering and isolation between CPUs/microcontrollers and peripherals or memory (RAM/ROM, ASICs)
- Bus sharing with tri-state control for multiple devices on a common line
- Level shifting between voltage domains (e.g., 3.3V/2.5V to 5V)
- Fan-out expansion to drive multiple inputs from one source
- General-purpose 8-bit buffer in digital interfaces, backplanes, and interconnects

PowerPAD (thermally enhanced) package, 20-pin.