Overview
The SN74HC540NG4, produced by Texas Instruments, is an octal buffer and line driver with 3-state outputs. This device is part of the popular HC240 series and is designed to facilitate efficient printed circuit board layout with its data flow-through pinout, where all inputs are on one side of the package and all outputs are on the opposite side.
The SN74HC540NG4 operates over a wide voltage range of 2 V to 6 V, making it versatile for various applications. It features high-current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads, and it has low power consumption with a maximum ICC of 80 µA.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| VCC (Supply Voltage) | 2 | 5 | 6 | V |
| VIH (High-level Input Voltage) at VCC = 2 V | 1.5 | 1.5 | 1.5 | V |
| VIH (High-level Input Voltage) at VCC = 4.5 V | 3.15 | 3.15 | 3.15 | V |
| VIH (High-level Input Voltage) at VCC = 6 V | 4.2 | 4.2 | 4.2 | V |
| VIL (Low-level Input Voltage) at VCC = 2 V | 0.5 | 0.5 | 0.5 | V |
| VIL (Low-level Input Voltage) at VCC = 4.5 V | 1.35 | 1.35 | 1.35 | V |
| VIL (Low-level Input Voltage) at VCC = 6 V | 1.8 | 1.8 | 1.8 | V |
| IOH (Output Current) at VCC = 4.5 V, IOH = -6 mA | 3.98 | 4.3 | 3.7 | V |
| IOL (Output Current) at VCC = 4.5 V, IOL = 6 mA | 0.17 | 0.26 | 0.4 | V |
| ICC (Quiescent Current) at VCC = 6 V, IO = 0 | 8 | 160 | 80 | µA |
| tpd (Propagation Delay) at VCC = 6 V | 13 | 26 | 38 | ns |
Key Features
- Wide operating voltage range of 2 V to 6 V.
- High-current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads.
- Low power consumption with a maximum ICC of 80 µA.
- Typical propagation delay (tpd) of 8 ns at 5 V.
- ±6-mA output drive at 5 V.
- Low input current of 1 µA maximum.
- Data flow-through pinout with inputs and outputs on opposite sides of the package, facilitating printed circuit board layout.
- 3-state control gate is a 2-input NOR; if either output-enable (OE1 or OE2) input is high, all eight outputs are in the high-impedance state.
- Provides inverted data at the outputs).
Applications
- LED drivers and display systems.
- Servers and data centers.
- Personal computers and notebooks.
- Wearable health and wellness devices.
- Electronic points of sale (POS) systems.
- General-purpose buffering and line driving in digital circuits.
Q & A
- What is the operating voltage range of the SN74HC540NG4?
The operating voltage range is from 2 V to 6 V.
- What is the maximum quiescent current (ICC) of the SN74HC540NG4?
The maximum ICC is 80 µA.
- How many LSTTL loads can the SN74HC540NG4 drive?
The device can drive up to 15 LSTTL loads.
- What is the typical propagation delay (tpd) of the SN74HC540NG4 at 5 V?
The typical tpd is 8 ns at 5 V).
- What is the output drive capability of the SN74HC540NG4 at 5 V?
The device can drive ±6 mA at 5 V).
- How does the 3-state control gate work on the SN74HC540NG4?
The 3-state control gate is a 2-input NOR; if either output-enable (OE1 or OE2) input is high, all eight outputs are in the high-impedance state.
- What type of data does the SN74HC540NG4 provide at its outputs?
The device provides inverted data at the outputs).
- What is the benefit of the data flow-through pinout in the SN74HC540NG4?
The data flow-through pinout facilitates printed circuit board layout by having inputs and outputs on opposite sides of the package.
- What are some common applications of the SN74HC540NG4?
Common applications include LED drivers, servers, PCs, notebooks, wearable health devices, and electronic POS systems).
- What are the package options available for the SN74HC540NG4?
The device is available in various packages including PDIP, SOIC, SOP, SSOP, TSSOP, and CDIP).
