# How to implement HD74HC32 (quadruple 2-input positive-OR gate)?

I'm struggling to implement the HD74HC32 (quadruple 2-input positive-OR gate) package:

Notes:

• 1.8 volt power supply, sufficient according to the HD74HC32 datasheet
• 1A is located at the left bottom
• Vcc connected to [+] and GND connected to [-]
• 1Y connected to LED Anode
• LED cathode connected to [-]

I tried every possible combination, with and without resistors, but I cannot get the gate to work. The LED even stays on while 1A and 1B are disconnected.

How do I get this OR gate to work as expected?

The following question looks alike, but I just can't get it to work :(
Connecting AND Gate Chip to an Integrated Circuit

My reputation is too low to embed images, that's why linked directly, sorry!

• Can you link the datasheet? Why do you use 1.8V? – jippie Jun 7 '13 at 21:16
• Thanks for your edit and comment! The HD74HC32 datasheet. I choose the 1.8 volt because I ran out of proper resistors for the LED to work with 5 volt. I'm just "playing around" with logic gates for the first time! – Anne Jun 7 '13 at 21:38

• Thanks four your quick and clear answer, greatly appreciated! Works like a charm :) – Anne Jun 7 '13 at 21:35