SN74LV1T125: 5V -> 1.8V & 1.8V -> 5V Level shift,

GARETH OU

Part Number: SN74LV1T125
Other Parts Discussed in Thread: TXU0204, SN74AHCT244, SN74LXC8T245, TXS0108E, TXU0104, TXV0106, TXV0108, SN74AXC8T245

Tool/software:

In the previous product, the following was used:

SN74LV244APWR, 5V -> 3.3V Level shift

SN74AHCT244PWR, 3.3V -> 5V Level shift

But the new case is expected to use 5V -> 1.8V & 1.8V -> 5V Level shift,

Could you help me suggest suitable part?

9 months ago

0 Clemens Ladisch 9 months ago

Guru 316920 points

Use level shifters with two supplies, e.g., TXU0204. How many channels in each direction do you need?

0 Yuan Rao 9 months ago

TI__Intellectual 1150 points

Hello

The team is currently on Thanksgiving holidays. Pls expect response delay till Dec-2nd. Thank you for your patience.

-Yuan

0 GARETH OU 9 months ago in reply to Yuan Rao

Guru 11415 points

Customers need the 8 channel speed to be the same as or better than SN74LV244&SN74AHCT244.

0 Clemens Ladisch 9 months ago in reply to GARETH OU

Guru 316920 points

SN74LXC8T245

0 GARETH OU 9 months ago in reply to Clemens Ladisch

Guru 11415 points

Hi Clemens

Is there any one with 20pin TSSOP like TXS0108E, but with 5V to 1.8V?

0 Clemens Ladisch 9 months ago in reply to GARETH OU

Guru 316920 points

No; most buffered lever shifters are implemented as transceivers and need the additional DIR pin. Unidirectional shifters like the TXU0104 do not exist with eight channels.

0 Joshua Salinas 9 months ago in reply to GARETH OU

TI__Mastermind 22790 points

Hello Gareth,

I agree with Clemens, the SN74LXC8T245 would be the best option here. We don't have 8-ch unidirectional level shifters so +20pin TSSOP package don't exist.

Regards,

Josh

0 GARETH OU 9 months ago in reply to Joshua Salinas

Guru 11415 points

TXS0108E

1. Are you sure TXS0108E can operate from 1.8 to 5V?

2. The Simplified application Vccb output in SPEC is 3.3V, and the System controller is also connected to 3.3V. Is it OK if it is connected to 5V? If it can be connected to 5V, then VCCA should be connected to 1.8V, VCCB should be connected to 5V, and OE should be connected to GEN. In this way, can the 1.8V to 5V (A to B) Level shift be achieved normally?

3. Please provide the TXS0108E reference schematic

SN74LXC8T245:

1. VCCA is connected to 1.8V, VCCB is connected to 5V, and OE/DIR are connected to GND. Is it possible to achieve 5V to 1.8V (B to A) Level shift normally?

2. Please provide the SN74LXC8T245 reference schematic

0 Joshua Salinas 9 months ago in reply to GARETH OU

TI__Mastermind 22790 points

Hello Gareth,

TXS0108E:

1. Yes. Please take look at the recommended conditions on the datasheet.

2. The simplified application shows a typical use case. The device can work at VCCA = 1.8V and VCCB = 5V

3. We have an evaluation board you can take a look at, TXS-EVM

SN74LXC8T245

1. Yes. Please take a look at the recommended conditions on the datasheet. Just make sure DIR pin is set to Low

2. We have an evaluation board you can take a look at, AVCLVCDIRCNTRL-EVM

Regards,

Josh

0 GARETH OU 9 months ago in reply to Joshua Salinas

Guru 11415 points

Hi Josh

Are there any product recommendations for level shift 1.8V to 3.3V and 3.3V to 1.8V with speed up to 130MHz?

0 Joshua Salinas 9 months ago in reply to GARETH OU

TI__Mastermind 22790 points

Hello Gareth,

Could you also provide how many channels you need and what interface you are trying to level translate?

Regards,

Josh

0 GARETH OU 9 months ago in reply to Joshua Salinas

Guru 11415 points

Hi Josh

Is there any one with 6bit or above?

0 Clemens Ladisch 9 months ago in reply to GARETH OU

Guru 316920 points

TXV0106

0 Joshua Salinas 9 months ago in reply to GARETH OU

TI__Mastermind 22790 points

Hello Gareth,

Similar to what Clemens mentioned, we have the

TXV0106 (6Ch)
TXV0108 (8Ch)
SN74AXC8T245 (8Ch)

All of these devices operate from 1.8V <-> 3.3V and support 130MHz.

Regards,

Josh

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SN74LV1T125: 5V -> 1.8V & 1.8V -> 5V Level shift,