This post explains for the TTL IC.
Part Number: 7408, DM7408
Function : Quad 2-Input AND Gates
Package: DIP, SOP 14 Pin Type
Manufacturer: Fairchild
See the preview image and the 7408 Datasheet file for more information.
7408 Pinout
Description
This device contains four independent gates each of which performs the logic AND function.
Fuction Table ( Y= AB )
A B Y
L L L
L H L
H L L
H H H
Recommended Operating Conditions
1. VCC : Supply Voltage = 4.75 5 5.25 V
2. VIH : HIGH Level Input Voltage = 2 V
3. VIL : LOW Level Input Voltage = 0.8 V
4. IOH : HIGH Level Output Current = −0.8 mA
5. IOL : LOW Level Output Current = 16 mA
6. TA : Free Air Operating Temperature = 0 70 °C
Absolute Maximum Ratings