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SN74LS00N

Quad 2-input NAND gate, LS TTL, 15ns, PDIP-14, universal gate

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Manufacturer Part：

SN74LS00N

Package：

PDIP-14 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

Brand：

Product Categories：

Integrated Circuits ICs, Interface ICs

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Description

Product Overview

The SN74LS00N from Texas Instruments is a quad 2-input NAND gate—the most fundamental and widely-used TTL logic IC—with 15ns propagation delay and industry-standard 7400 pinout in a 14-pin PDIP package.

Key Specifications

Number of Gates	4 (quad 2-input NAND)
Logic Family	LS (Low-power Schottky)
Supply Voltage	4.75V to 5.25V (5V nominal)
Propagation Delay	15ns typical @ 5V
Output Drive (IOL/IOH)	8mA / -0.4mA
Operating Temperature	0°C to +70°C
Package	PDIP-14 (19.3 x 6.35mm)

Features

Four independent 2-input NAND gates
LS TTL technology
15ns typical propagation delay
Industry-standard 7400 pinout
NAND is a universal logic gate

Applications

General-purpose logic gating
SR latch construction
Active-low signal combination
Logic function implementation
Glue logic in digital systems

Product Introduction:SN74LS00N Product Introduction

The SN74LS00N from Texas Instruments contains four independent 2-input NAND gates in a 14-pin PDIP package—the original and most iconic TTL logic IC. Each gate performs the Boolean function Y = NOT(A AND B); the output is LOW only when both inputs are HIGH. The NAND gate is a universal gate: any Boolean function can be implemented using only NAND gates. An inverter is a NAND with both inputs tied together; an AND is a NAND followed by an inverter (two NANDs); an OR is NAND gates with inverted inputs. Two NAND gates cross-coupled form an SR latch. The 74LS00 is the simplest and most versatile logic building block, found in virtually every digital system from the 1970s to today. The N suffix denotes the PDIP-14 through-hole package.

Working Principle:SN74LS00N Working Principle

Each NAND gate in the SN74LS00N performs Y = A NAND B = NOT(A AND B). The truth table is: 00→1, 01→1, 10→1, 11→0. The output is LOW only when ALL inputs are HIGH. As a universal gate, the NAND can implement any Boolean function: NOT(A) = A NAND A; A AND B = NOT(A NAND B) = (A NAND B) NAND (A NAND B); A OR B = (A NAND A) NAND (B NAND B). Two cross-coupled NAND gates form an SR latch: if S goes LOW, Q goes HIGH; if R goes LOW, Q goes LOW. When both S and R are HIGH, the latch holds its previous state. The LS (Low-power Schottky) technology uses Schottky-clamped transistors that prevent deep saturation, providing 15ns propagation delay—3× faster than standard 7400 TTL—while consuming only about 2mW per gate.

Pin Description:SN74LS00N Pin Definition and Functions

Pin	Name	Type	Description
1	1A	Input	Gate 1 input A
2	1B	Input	Gate 1 input B
3	1Y	Output	Gate 1 output (NAND)
4	2A	Input	Gate 2 input A
5	2B	Input	Gate 2 input B
6	2Y	Output	Gate 2 output (NAND)
7	GND	Power	Ground
8	3Y	Output	Gate 3 output (NAND)
9	3A	Input	Gate 3 input A
10	3B	Input	Gate 3 input B
11	4Y	Output	Gate 4 output (NAND)
12	4A	Input	Gate 4 input A
13	4B	Input	Gate 4 input B
14	VCC	Power	Supply (4.75V to 5.25V)

Application Scenarios:In which products and applications isSN74LS00N used

SR Latch: Two NAND gates cross-coupled; S=LOW sets Q=HIGH; R=LOW resets Q=LOW; simplest memory element
Inverter: Tie both inputs together; NAND(A,A) = NOT(A); saves using a 7404
Active-LOW AND: NAND combines two active-low inputs; output goes HIGH when EITHER input goes LOW
Glue Logic: General-purpose NAND for combinational logic; implements any Boolean function with enough gates
Oscillator: Three NAND gates in a ring (each output to next input) with RC delay; simple clock generator

Alternative Models:What chips are recommended as replacements for SN74LS00N

Model	Manufacturer	Key Difference	Package	Supply
74LS00N	TI/Nexperia	Original TTL version with 5V-only supply, typical propagation delay 10-15ns	DIP-14	5V TTL
74LS00D	TI/Nexperia	Surface-mount SOIC version of LS with identical logic function	SOIC-14	5V TTL
74HC00D	TI/Nexperia	CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity	SOIC-14	2-6V CMOS
74HC00N	TI/Nexperia	Through-hole DIP version of HC family for prototyping and repair	DIP-14	2-6V CMOS
74HCT00D	TI/Nexperia	CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V	SOIC-14	4.5-5.5V TTL-in
74HCT00N	TI/Nexperia	Through-hole DIP version of HCT family for prototyping and repair	DIP-14	4.5-5.5V TTL-in
74AC00D	TI/Nexperia	Advanced CMOS with 2-6V supply and higher output drive current (24mA vs 6mA for HC)	SOIC-14	2-6V CMOS
74AC00N	TI/Nexperia	Through-hole DIP version of AC family for prototyping and repair	DIP-14	2-6V CMOS
74LVC00D	TI/Nexperia	Low-voltage CMOS for 1.65-3.6V modern logic with 24mA output drive and bus-hold inputs	SOIC-14	1.65-3.6V CMOS
74LVC00N	TI/Nexperia	Through-hole DIP version of LVC family for prototyping and repair	DIP-14	1.65-3.6V CMOS
74AUP00D	TI/Nexperia	Ultra-low power CMOS with 0.8-3.6V supply for battery-powered and mobile applications	SOIC-14	0.8-3.6V CMOS
74AUP00N	TI/Nexperia	Through-hole DIP version of AUP family for prototyping and repair	DIP-14	0.8-3.6V CMOS

The 7400 is a Quad 2-Input NAND Gate. Family variants span from the original LS TTL (5V only) to modern LVC/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.