mstechca
New Member
I just made a PCB for my new programmer, chedked the IC's pinouts, and according to logical thinking, the circuit works.
When I tested it with 5V, the 74LS245 was heating up, and the remaining chips did not heat up at all. This makes me think that there is something wrong with the 74LS245.
I make a ridiculously simple circuit (on a breadboard) with the 74LS245 using these connections:
Pin 19 to ground
Pin 10 to ground
Pin 20 to +5VDC
Pin 11 to +5VDC
Pin 2 to LED, LED to 470 ohm pull-down resistor.
I first connected pin 1 to ground, and then a few minutes later, connected it to +5VDC (ground and +5VDC are not connected together).
The LED indicates that the chip is working, but the chip is hot.
Is it just this particular chip?
I don't have these problems with other 74 series chips.
When I tested it with 5V, the 74LS245 was heating up, and the remaining chips did not heat up at all. This makes me think that there is something wrong with the 74LS245.
I make a ridiculously simple circuit (on a breadboard) with the 74LS245 using these connections:
Pin 19 to ground
Pin 10 to ground
Pin 20 to +5VDC
Pin 11 to +5VDC
Pin 2 to LED, LED to 470 ohm pull-down resistor.
I first connected pin 1 to ground, and then a few minutes later, connected it to +5VDC (ground and +5VDC are not connected together).
The LED indicates that the chip is working, but the chip is hot.
Is it just this particular chip?
I don't have these problems with other 74 series chips.