Other Parts Discussed in Thread: SN74LVC1G79, , SN74HCS74
My customer want to default output low level,but when use SN74LVC1G80,it default output low level.Can I use SN74LVC1G79 to output low level by default?
Blow is the customer's circuit diagram
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My customer want to default output low level,but when use SN74LVC1G80,it default output low level.Can I use SN74LVC1G79 to output low level by default?
Blow is the customer's circuit diagram
Hey Zhengxin,
You will need a D flip flop with a clear pin so you can add a power on reset circuit. The easiest way to do this is to use the SN74HCS74 device which will allow you tie the RC circuit directly to the CLR pin. You can see an example of this in the application section of the datasheet.
I only need one output, I want to know whether pin four of SN74LVC1G79 can output low level by default (contrary to pin four of SN74LVC1G80)
Neither the SN74LVC1G79 nor the SN74LVC1G80 have a default output level; see [FAQ] What is the default output of a latched device? (Flip-Flop, latch, register)
Actually, what I mean is that I am using SN74LVC1G80, but I want to reverse the four-pin output, so should I replace SN74LVC1G79?
The output changes when the device detects a rising edge on the CLK input, i.e., when the voltage at the CLK pin crosses the switching threshold.
It is not allowed for CLK to rise slowly; see the Δt/Δv limit in the recommended operating condiions.