[SI-LIST] Re: Fw: 5V To 3V
- From: Wyland <dcwyland@xxxxxxxxxxxxx>
- To: weirsp@xxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Sat, 13 Dec 2003 09:57:50 -0800
Check out IDT (www.idt.com) for application notes on using Quickswitch
as a 5V to 3V
converter. It is bidirectional, has essentially zero delay and requires
no controls. Just
put it between the two devices and watch it work. Quickswitch was
invented by
Quality Semiconductor, which was bought by IDT.
For the Quickswitch device to work, the lopgic threshold should be below
~2.5 volts.
Threshold is not a problem for TTL compatible devices. TTL threshold is
1.4 volts.
Almost all I/O's are TTL compatible.
Dave Wyland
steve weir wrote:
>Steve, for the speeds you are dealing with you can use either a level
>translator of which many are widely available, or assuming the 5V side has
>a sufficiently low Vih threshold, a Quickswitch type device. TI, IDT,
>Fairchild, etc all have parts that are suitable.
>
>Steve.
>
>
>At 10:51 AM 12/13/2003 +0000, Steve GullWing UK wrote:
>
>
>
>
>>>Dear SI'ers,
>>> I am trying to interface a 5V micro-controller to a
>>>
>>>
>>3V
>>
>>
>>>LCD Controller IC. What is the easiest and cheapest way to do this.
>>>
>>>Regards
>>>Steve M
>>>GW Ltd
>>>
>>>
>>>
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