N74F27D,623

Series:	74F
Packaging:	Tape & Reel (TR)
Part Status:	Obsolete
Logic Type:	NOR Gate
Number of Circuits:	3
Number of Inputs:	3
Features:	--
Voltage - Supply:	4.5 V ~ 5.5 V
Current - Output High, Low:	1mA, 20mA
Logic Level - Low:	0.8V
Logic Level - High:	2V
Max Propagation Delay @ V, Max CL:	5ns @ 5V, 50pF
Operating Temperature:	0°C ~ 70°C
Mounting Type:	Surface Mount
Supplier Device Package:	14-SO
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Base Part Number:	74F27

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N74F27D,623 Application Field and Working PrincipleThe N74F27D,623 is one type of device that falls into the category of Logic - Gates and Inverters. It is an integrated seven-input NAND gate as well as a driver for low power/high output sink applications. This device is suitable for use as a high speed, low current, single chip logic inverter or a high speed pulse amplifier.The main features of the N74F27D,623 include a wide voltage range of 3-15 V, low power supply current range of 0.8-15mA, a current transfer ratio of 400µA/IOL, and an output transition time of 4ns. It also has an open-drain output configuration, a wide speed range, short circuit protection and a low VCE clamp voltage to minimize power dissipation.The integrated circuit has three operating conditions, static, dynamic and short circuit. The static mode is when the device is inactive and the dynamic mode is when the device is in operation. In the static mode, the power supply current is low, thus providing ultra-low power consumption. In the dynamic mode, the currents are slightly higher but still provide high speed and low current requirements. In the short-circuit protection mode, the device shuts down and is protected from potential damage.To understand how the N74F27D,623 functions, it is important to understand how a NAND gate works. A NAND gate is an electronic circuit that consists of two or more logic gates with an ‘AND’ logic operation. It takes two or more high (1) or low (0) inputs and then produces a high (1) or low (0) output. The N74F27D,623 is a seven-input NAND gate, which means that it can take up to seven high (1) or low (0) inputs. The NAND gate produces a high (1) output if one or more of the input signals is low (0), and a low (0) output if all of the input signals are high (1).In terms of application fields, the N74F27D,623 finds its most common use in low power/high output sink applications. This includes such things as RF power amplifier cascades, microphone preamplifiers, digital signal processors, and image processors. The N74F27D,623 is also commonly used for pulse-width-modulated motors, audio switching, battery-powered applications, and light-emitting diode (LED) backlighting controllers.In terms of working principle, the N74F27D,623 is designed to transfer high-level current (the amount of current that drives the load element) with a low-level input. This is achieved by using a Darlington pair with two bipolar transistors acting as a current amplifier. The input base current is amplified by a factor of 500 to 600, allowing it to power the device. Other working principles of the N74F27D,623 include the Open-Drain Ouput Configuration, Wide Speed Range, and Short Circuit Protection.In conclusion, the N74F27D,623 is a seven-input NAND gate and a driver for low power/high output sink applications. It can be used in RF power amplifier cascades, microphone preamplifiers, digital signal processors, and image processors as well as pulse-width-modulated motors, audio switching, battery-powered applications, and LED backlighting controllers. It offers a wide voltage range, low power supply current range, a current transfer ratio of 400µA/IOL and an output transition time of 4ns, as well as open-drain output configuration, a wide speed range, and short circuit protection to minimize power dissipation. The N74F27D,623 works by using a Darlington pair with two bipolar transistors acting as a current amplifier and amplifying the input base current by a factor of 500 to 600.

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