[SI-LIST] Re: Level Shifter
- From: DrFWS@xxxxxxx
- To: sunil_bharadwaz@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Mon, 25 Jan 2010 19:10:34 EST
Sunil - take a look at the following TI translators
TXS0102/TXS0104/TXS0108 (2/4/8 bits per package)
1.65V - 3.6V on one side, 2.3V - 5.5V on the 2nd side
Bi-directional auto sensing
Regards - Bill
Dr. F. Williams Sarles
Consulting Engineer
FWS ENGINEERING
Lexington MA 02420-3449
Tel: 781-862-0607
Fax: 781-861-7518
Email: DrFWS@xxxxxxx
_FWSarles@xxxxxxxxxxxxx (mailto:FWSarles@xxxxxxxxxxxx)
In a message dated 1/25/2010 12:55:31 P.M. Eastern Standard Time,
sunil_bharadwaz@xxxxxxxxx writes:
Hi ,
I'am doing an application where a Microcontroller interacts with the rest
of the digital
circuitry working at 3.3 Volts (LVTTL).
The Microcontroller can operate from 2.0 Volts to 3.6 Volts.
The Supply to the Microcontroller can be any thing from 2.0 Volts to 3.6
Volts , where
as the rest of the circuitry operates at a fixed 3.3 Volts.
There is a bi-directional data flow between the uc & rest of the digital
logic.
The max logic high I/P, the uc can tolerate is 2.5 Volts , when operated
at 2.0 Volts supply (Supply + 0.5 Volts).The logic high O/P of the rest of
the circuitry is at almost 3.3 Volts.We require a level shifter to bring
down the level of this signal which is I/P to uc.
Similarly , the VIH of the rest of circuitry is 2.0 Volts.The VOH of uc at
2.0 Volts supply
is only about 1.8 Volts or less.This requires a level shifter to shift to
a higher level.
The problem here is a variable supply to uc , which can be any value from
2.0 Volts
to 3.6 Volts.
Pls suggest a proper level shifter here.Are there any bi-directional level
shifters for
these types of applications ?
Thanks in Advance !!
Regards
Sunil.B
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Regards - Bill
Dr. F. Williams Sarles
Consulting Engineer
FWS ENGINEERING
54 Ledgelawn Avenue
Lexington MA 02420-3449
Tel: 781-862-0607
Fax: 781-861-7518
Email: DrFWS@xxxxxxx
FWSarles@xxxxxxxxxxxx
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