74LS38 Quad 2-input NAND Buffer (Open Collector)

The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. 74LS38 Quad 2-input NAND Buffer (Open Collector) containing four independent 2-input NAND buffer gates with open-collector outputs. The open-collector outputs require pull-up resistors to perform correctly. They may be connected to other open-collector outputs to implement active-low wired-OR or active-high wired-AND functions. Open-collector devices are often used to generate high VoH levels

74LS38 Features

• Four Independent NAND Buffer Gates
• Open Collector Outputs Require External Pull-Up Resistors
• Fast Switching Times
• Operating Temperature up to 70°C
• Standard TTL Switching Voltages

74LS38 Specifications

Supply Voltage	4.75 – 5.25Vdc
Maximum Clock Frequency	40Mhz
Power Dissipation	2mW/gate @100kHz
Minimum Output Current	8mA
Propagation Delay	10nS
Fan Out (TTL Loads)	20

74LS38 Pinout Diagram

74LS38 Pin Description

Pin No	Pin Name	Description
1	A1	NAND Buffer 1 Input 1
2	B1	NAND Buffer 1 Input 2
3	C1	NAND Buffer 1 Output
4	A2	NAND Buffer 2 Input 1
5	B2	NAND Buffer 2 Input 2
6	C2	NAND Buffer 2 Output
7	GND	Ground
8	C3	NAND Buffer 3 Output
9	A3	NAND Buffer 3 Input 2
10	B3	NAND Buffer 3 Input 2
11	C4	NAND Buffer 4 Output
12	A4	NAND Buffer 4 Input 1
13	B4	NAND Buffer 4 Input 2
14	VCC	Positive Supply

74LS38 Circuit

Applications

• Freezer warning buzzer
• Burglar alarm

74LS38 Alternative Equivalent

74LS37, 74LS30, 74LS20

Download 74LS38 Quad 2-input NAND Buffer (Open Collector) Datasheet from the link given below.