SN74LVC1G07-Q1: how to achieve wire-or logic?

Hi Sebastian,

I just use BJT as an example. In my customer's case, they have internal pull-up resistor inside the chip for open-drain structure, but they want to realize "wire-or" logic. Is it achievable if they tie several pin together? Thanks.

BR,

Elec Cheng

Hi Elec,

What chip are you referring to? Can you provide a schematic? The device you tagged in your post SN74LVC1G07-Q1 is just an open drain buffer (no internal pull up resistor). Using the circuit in my previous reply you can achieve an OR function with all the outputs of the open-drain inverters tied together and pulled up to Vcc, then connect the output to an inverter. The circuit above would be a 5 input OR gate. 

Regards,

Sebastian 

Hi Sebastian，

sorry to make you confused. Actually the customer doesn't use the product from your BU. But it's related to open drain and wire-or. So I post this question. 

Assuming our customer is using SN74LVC06A-Q1, which is open-drain output. But the schematic design is as below. Can they achieve "wire-or" function? 

BR,

Elec Cheng

Hi Elec,

You must use an inverter after the pull up resistor to achieve an OR function as shown in the circuit in my first reply. 

Regards,

Sebastian 

Please note that you need only a single pull-up resistor.