74LS31 Hex Delay Element/Delay Line Generator IC

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74LS31 is a Hex Delay Element/Delay Line Generator IC belonging to the 74XXYY IC Series. The 74LS31 is a TTL (Transistor to Transistor Logic) which uses low power Shottky transistors to reduce the stored charge and get higher switching speeds than with conventional bipolar transistors. The 74LS31 delay elements are intended to provide well-defined delays across both temperature & Vcc ranges. when used in a cascade configuration, limitless gate delay range is possible.

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What is a Hex Delay Line Generator?

A Hex delay line generator is a piece of electronic test equipment that provides precise delays for triggering, syncing, delaying, and gating events. These generators are used in many types of experiments, controls, and processes where the electronic timing of a single event or multiple events to a common timing reference is needed.

74LS31 Key Features & Specifications

Technology Family: LS
VCC (Min): 4.75V
VCC (Max): 5.25V
No. of channels: 6
IOL (Max): 24mA
IOH (Max): -1.2mA
Input type: Bipolar
Output type: Push-Pull
Features: High speed (TPD 10-50ns), Input clamp diode
Data rate: 70Mbps
Rating: Catalog

74LS31 Pinout

Pin No.	Pin Name	Description
1	1A	Hex Inverter input 1
2	1Y	Hex Inverter output 1
3	2A	Buffer input 1
4	2Y	Buffer output 1
5	3A	NAND input 1
6	3B	NAND input 2
7	3Y	NAND Output 1
8	GND	Ground
9	4Y	NAND Output 2
10	4A	NAND input 2
11	4B	NAND input 1
12	5Y	Buffer Output 2
13	5A	Buffer Input 2
14	6Y	Hex Inverter Input 2
15	6A	Hex Inverter Output 2
16	6A	Chip Supply Voltage

Applications

The 74LS31 IC has a number of uses , some of them are listed as below:

A delay line generator can also be used to delay and gate high-speed photodetectors in high-speed imaging applications.
The chip provides TTL outputs that are needed in some systems.