Description
BUY 74HC138 DIP-16 https://www.utsource.net/itm/p/8647202.html
| Pin Number |
Pin Name |
Description |
| 1 |
GND |
Ground |
| 2 |
E1 |
Enable Input 1 (Active Low) |
| 3 |
A |
Address Input A |
| 4 |
Y3 |
Output 3 (Active Low) |
| 5 |
Y2 |
Output 2 (Active Low) |
| 6 |
Y1 |
Output 1 (Active Low) |
| 7 |
Y0 |
Output 0 (Active Low) |
| 8 |
VCC |
Supply Voltage (+5V) |
| 9 |
Y7 |
Output 7 (Active Low) |
| 10 |
Y6 |
Output 6 (Active Low) |
| 11 |
Y5 |
Output 5 (Active Low) |
| 12 |
Y4 |
Output 4 (Active Low) |
| 13 |
B |
Address Input B |
| 14 |
C |
Address Input C |
| 15 |
E3 |
Enable Input 3 (Active Low) |
| 16 |
E2 |
Enable Input 2 (Active Low) |
Instructions for 74HC138 DIP-16:
- Power Supply: Connect pin 8 (VCC) to +5V and pin 1 (GND) to ground.
- Enable Inputs: To activate the decoder, set at least one of the enable inputs (E1, E2, E3) low. All three must be low for normal operation.
- Address Inputs: Apply binary input signals to pins A, B, and C to select which output line should go low. The outputs are active low.
- Outputs: The device has eight active-low decoded outputs (Y0-Y7). Only one output is low at any given time based on the address inputs and enable conditions. If an invalid or out-of-range address is applied, all outputs remain high.
- Handling Unused Outputs: Ensure that unused outputs are either left open or connected to a pull-up resistor if interfacing with logic that requires active-high signals.
(For reference only)
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