仕様
| 属性 | 値 |
| Supplier | Texas Instruments |
| Package / Case | Tape & Reel (TR),Cut Tape (CT) |
| Series | 74AHC |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Output Type | 3-State |
| Current - Output High Low | 8mA, 8mA |
| Voltage - Supply | 2V ~ 5.5V |
| Operating Temperature | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount |
概要
Description
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.
Equivalent
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.
- 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.
Features
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.)
- 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.)
Pinout
- 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.
- 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
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.
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.
Application
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
- 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
Package
PowerPAD (thermally enhanced) package, 20-pin.
