Questions tagged [level-translation]

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Logic translator between different ground references

I need to translate a 1.8 V digital signal ("power good" from a DC-DC converter) from a "floating" voltage domain to a 3.3 V signal referenced to a fixed system ground. The source ...
mattmunee's user avatar
1 vote
1 answer
43 views

Does NCA9306 level translator need a power source that can sink current?

I wanted to use LSF0102 translator IC to translate 5V to 3.3V with TWI/I2C but I noticed in datasheet it says it needs the low voltage/side's power source to be able to sink current (about 15mA of ...
Christianidis Vasilis's user avatar
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1 answer
143 views

How can I find the maximum data rate of a voltage level translator IC?

I am planning to use the NVT2010 in my board for voltage level translation of the Ethernet RMII interface. We know that the speed of RMII interface is 10/100Mbps. After checking the datasheet, I am ...
Hari's user avatar
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1 vote
1 answer
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Bi-directional voltage translation with ESD and EMI protection

I plan to use the following circuit connected to a ESP32 GPIO line which is 3.3V to control stepper driver and, if needed, serve as a digital input (0V/5V). Diode is there for ESD protection and ...
Maxim Kachurovskiy's user avatar
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2 answers
52 views

Why PCA9306 2.9V coming at lower side even after removing the pullup

Below is my schematic for PC9306. The high side is connected to 5V and it is going to an Arduino Nano. SDA from our ASIC is coming to J113 (SMA connector marked in RED). The voltage at this side is 2....
Hari's user avatar
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Using SN74LVC245AN for 5V to 3v3 serial data translation is causing input to not go to 0V

Integrating a ESP32 with a device which outputs 5V serial signal. This is a device I have no control over and don't know much about (ie: CMOS vs TTL, etc?). All I know is that it has a 5V serial ...
jr.'s user avatar
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2 answers
204 views

Advice on translating a 3V3 PWM signal to a 6V PWM signal

I'm trying to control 3 20Kg servo motors powered by 6V (Link to servo motor datasheet here), using an STM32L5 microcontroller. Currently, the design uses an Arduino Pro Mini powered by 5V, and using ...
E.HP.S's user avatar
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1 answer
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Isolators and Level shifters - default to logic 1

I've been making my first boards to do some testing in power electronics. I'm testing unpowered circuits, and there's something that baffles me. I'm testing if pulses appear correctly on gate drives ...
Grigoris's user avatar
1 vote
1 answer
185 views

Level shifter is injecting noise to ground

I have a camera core with a DVP interface which has 2.5 V data logic and the system I am using is 3.3 V level. So I have used a TI SN74AVC20T245 level shifter to shift 2.5 V to 3.3 V. The image from ...
Tomin Jose's user avatar
-1 votes
1 answer
376 views

What's wrong with level shifter output? [closed]

I was trying to understand what wrong about the output of the level shifter, the level shifter is part of my circuit that I trying to bring-up and encountered difficulty in this issue. This is the ...
Knowledge's user avatar
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5 answers
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Is it legitimate to level shift down a logic input with just series resistance?

In this particular instance, I'm using a STWD100NYWY3F with a 3.3v Vcc and feeding it's !EN input from a 5v TTL signal (from a SN74LS00D). The absolute max input is Vcc + 0.3v. I propose to just put a ...
nsayer's user avatar
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0 votes
1 answer
220 views

Level translator as digital buffer

In the datasheet of the C12880MA (Mini-spectrometer) they recommend using a digital buffer on pins to and from the module (CLK, ST, EOS, TRG): I'm not sure why. In my case, I need level translation ...
Francois's user avatar
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1 answer
399 views

voltage translation 1.8V and 3.3V using passive/active components

I have a chip that operates on 1.8V Vcc and has a digital interface I2C that also obviously outputs 1.8V signals and receives 1.8V signals. The datasheet says anything above 2V on VCC or digital input ...
DEKKER's user avatar
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1 answer
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Output state is undefined

I am using SN74LVC1T45 for level translation of 1.8V to 5V. What is the output state when the input is floating/disconnected? Is it high, low or undefined ? I need output to be to at defined state ...
MightyBeard007's user avatar
0 votes
2 answers
128 views

Fixed-direction voltage translators (level shifters) input voltages

I have a circuit that outputs a digital signal to an FPGA on an XEM6310 board. To digitize the signal, a comparator is used with a reference/threshold voltage of +12 V, with its positive rail tied to +...
Cole Fehr's user avatar
1 vote
3 answers
152 views

Sticky/Intermittent Relay Driven by MCU and NPN Transistor

I have an MCU (1.8 V logic levels) driving an NPN transistor to turn an relay on/off. The relay has a 12 V DC coil with resistance of 1028R per datasheet. This would require a current of 12/1028 = 11....
RoyalAce's user avatar
2 votes
1 answer
1k views

Circuit for 4-20mA to I2C conversion

Hello I have a circuit that takes a 4-20mA reading from a pressure transmitter and converts it to analog 0-5V then to I2C. But it doesn't seem to be reading I just see about 0.5V on the serial ...
Feynman137's user avatar
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PCA9306 Level Translator Output is coming without providing Enable Signal

I am using PCA9306 board for level Translation .The schematic is given below.The board is purchased from third party not made by me.(https://www.sparkfun.com/products/15439) I need to control the ...
Hari's user avatar
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Hardware Design Question Related to IMU VDD, VDDIO and IO pins

I am working on a flight controller design using ICM-20789, an IMU from TDK. As most of the components are powered by 3V3 source, so I am thinking connect IMU_VDD to 3V3 and VDDIO to 1V8 source same ...
Sam C's user avatar
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0 votes
2 answers
372 views

Communication between two microcontrollers with different operating voltages (5 V and 3.3 V)

I want to communicate between two microcontrollers - one is PIC18F2550 and the other is STM32F103VET. They operate at different voltages: 5 V (PIC) and 3.3 V (STM32). I would prefer to use SPI ...
naasif's user avatar
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1 vote
2 answers
109 views

What happens when level translator input and output are shorted?

I am using a level translator in my design to interface between two systems. I also want an option to bypass the level translator by shorting a jumper resistor placed across terminals A and B. What ...
saikumarkanikatla's user avatar
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0 answers
32 views

Level translator 3.3 V logic to -7 V logic [duplicate]

I am trying to replace a circuit on an old device. I need to translate from 3.3 V logic to 0 to -7 V logic. And vice-a-versa. Any suggestions would be greatly appreciated. Circuit INPUT: 0 to 3.3 V ...
Keith Hines's user avatar
0 votes
3 answers
259 views

Level Translator 3.3V to -7V with drive

I am retrofitting a circuit in existing equipment. I need a circuit for each direction. Circuit 1: 3.3V logic input. Output is GND or -7V with a load of 20k to 200k and 2nF. 25kHz or less. Drive ...
Keith Hines's user avatar
0 votes
1 answer
177 views

Level Shifting - Signal Scaling - Scale Analog Signal Voltage

I have a variable voltage called Vreg (Voltage regulated) which is output of switching regulator (buck converter) and is less than 12v. Also there is ANALOG Signal ...
epsi1on's user avatar
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0 votes
1 answer
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Does this method of level shifting work?

I'm curious if this method of level shifting works fine or not; or it suits the design I manage to do. I want to extend the cable length of both an I2C, and an I2C-like, low clocked communication ...
Tirdad Sadri Nejad's user avatar
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1 answer
1k views

I2C Level translator 5 V to 1.8 V using MOSFET, output look weird

I am designing an I2C level translator using MOSFET. I am using BSS138 DATA SHEET. My clock can go up to 1 MHz. The output is not coming properly for fast mode plus (CLK = 1 MHz, RISE TIME = FALL TIME ...
Hari's user avatar
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1 vote
1 answer
40 views

Normal current flow in LSF010x level translators

I am reviewing the datasheet and design documents for a level translator. TI has a great video explaining the operation of this device. I understand how the device works but my only concern is with ...
joe's user avatar
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2 votes
2 answers
147 views

Self-adjusting analog signal translator

I think this question is best asked on concrete-ish terms, so, here it goes. Let's say we have 4 wires, all with common ground: A) ≈9V-20V, varying. B) ≈3V-6V, varying. C) A low frequency analog ...
Ben Tait's user avatar
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0 answers
78 views

Level Translation Clarification (LVPECL and LVDS)

I am trying to understand something about level translation. I am sure I am probably misunderstanding something basic, so I'm hoping you can help me understand. I am trying to convert a LVPECL signal ...
bchang32's user avatar
2 votes
2 answers
458 views

Can Bruce Abbott's inverting TTL to +/- 12V level shifter be improved to better frequency response and better matched impedance?

I am working with Bruce Abbott's awesome level shifter here. Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz) simulate this circuit – ...
Gunther Schadow's user avatar
3 votes
3 answers
776 views

Level transformation 0/+5 V TTL logic to +/-9V how to maximize gain and frequency range (DC to 4 MHz)

I see a lot of repeat answers and instructions how to convert dual supply levels to logic levels, but I have the inverse situation, converting 0/+5 V TTL logic to +/-9 V, and I don't see a lot of info ...
Gunther Schadow's user avatar
0 votes
1 answer
148 views

Single chip level shifter from LVCMOS to 12 V

I'm working on a nixie clock based on a STM32L476RG microcontroller and HV5530 chips. The microcontroller uses 3.3 V logic while the HV5530 really needs 12 V logic, which is a pain to implement. There ...
Stelian Saracut's user avatar
0 votes
5 answers
2k views

Sharpening rise and fall time of square wave

I have designed a custom PCB using SN74LVCT145. The board is providing desired results up to 4MHz of frequency. From 5MHz to 20MHz the output waveform is not as desired. Edit 4: Can someone suggest ...
MightyBeard007's user avatar
1 vote
3 answers
144 views

Can I Use an Isolated DC/DC Converter to Step Down a Switching Dynamic Signal?

I have a 24V device that takes a signal of either of 36V or 72V that will switch on and off at around 2Hz. This signal needs to be converted to 24V and I'm considering this isolated DC/DC converter ...
IntiEngineer's user avatar
0 votes
0 answers
39 views

Vias in the Input and output path

I have designed a custom level translator using SN74LVC1T45. I have placed chips on top and bottom to reduce the board size and because of this, I have used vias for the input and outputs for the ...
MightyBeard007's user avatar
0 votes
1 answer
96 views

Impedance matching for custom level translator board

I have designed a custom board using SN74LVC1T45. I have followed the schematic of EVM and added few 150R resistors at input and output for reducing the ringing effect. The custom board will be ...
MightyBeard007's user avatar
0 votes
0 answers
249 views

Stepping Down Logic Level of a Differential Signal

simulate this circuit – Schematic created using CircuitLab Suppose I have a unipolar, differential 24V signal, and I want to step it down for use with a 5V differential receiver (such as RS-422)...
19172281's user avatar
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0 answers
201 views

Significant noise observed on channels of TXB0108

We're working with a ADC chip test setup that uses the TXDB0108 to step up 1.8V data lines to 2.5V that are connected to Kintex7 FPGA. The pin-out is as follows: VCCA is 1.8V, while VCCB is on a 2....
MavenMerkel's user avatar
1 vote
2 answers
189 views

Odd level translator output waveform from 3MHz

I am using SN74LVC1T45 for level translation from 1.8V to 5V. I have designed a custom board for this. The problem I am facing here is that I am getting desired out from 10Hz to 2MHz but from 3MHz the ...
MightyBeard007's user avatar
1 vote
3 answers
1k views

How does an auto bidirectional voltage translator work?

I'm trying to understand how the auto bi-directional voltage translators work. Background: I have to choose a part that can translate signals in both ...
not2qubit's user avatar
  • 404
1 vote
2 answers
928 views

What does OE do on TXB0102 device

Can somebody explain in short terms whats means this from datasheet TXB0102: When the output-enable (OE) input is low, all outputs are placed in the high-impedance state. I dont know how I ...
asterix's user avatar
  • 101
0 votes
0 answers
85 views

Output impedance matching for SN74lvc1t45

We are using SN74LVC1T45 IC for level translation and we are feeding translated voltage through BNC connectors (75 ohms) to other peripherals, during this we want to achieve impedance matching of 75 ...
mightybeard's user avatar
2 votes
1 answer
314 views

Multiple ground planes, single point ground, and a level shifter

I'm using a level shifter to go from 3.3V to 5V (digital/analog). According to the datasheet, if I put 1 ground on the left side of the IC and the other on the right, it would tie the grounds together ...
Gswffye's user avatar
  • 136
0 votes
1 answer
86 views

Fixing incorrectly routed TXB0108

I have a PCB with incorrectly connected TXB0108 (TSSOP20), VCCa 3V3 > VCCb 1V8, that I wanted to use for UART communication between two ICs. I'm looking into various options for fixing it. Here's the ...
pbn's user avatar
  • 131
0 votes
1 answer
451 views

Using a dual bidirectional I2C bus voltage-level translator

I have a module that uses an ADC powered with 3.3 V (MCP3422). I would like to communicate with it over I2C using an Arduino Mega. The problem is that the Arduino's I2C is operating at 5 V and the I2C ...
H123321's user avatar
  • 197
1 vote
2 answers
134 views

How can I build a versatile high voltage translator with an output in the negative and positive range?

Looking for advice on how to build an adjustable voltage translator. Input is standard 1V8 logic, but output HIGH is in a selectable range of +3 to -3V, while output LOW is way down in a selectable ...
Shubham's user avatar
  • 6,134
1 vote
2 answers
458 views

Is my understanding of this level shifter correct?

I am considering using this TI LSF0102 level shifter in my circuit - but would like to understand, based upon its datasheet, if I have my understanding correct. My aim is to be able to supply 3.3V ...
RenegadeAndy's user avatar
0 votes
1 answer
402 views

LVPECL termination impedance

I'm designing a level converter PCB using a LVPECL driver (ADCMP573) and a LVPECL-to-LVTTL translator (SY89323L). I'm reading a document about LVPECL termination schemes and there's something unclear ...
herrpark's user avatar
0 votes
3 answers
214 views

Fast voltage translation from 3.3v to 5.7v

I need to translate a 3.3v signal to 5.7v with transition of around 60ns or less. Voltage translators such as the TXS0101 usually specify the logic high level for the input as VDD x ~0.65 (= 3.7v in ...
Charlie Skilbeck's user avatar
-1 votes
1 answer
178 views

Active analog attenuation with OPA2340

I wish to have active analog attenuation circuit. Following this page, I got myself some OPA2340. I use the B-side to keep the numbering somewhat intact. I go with the design on Figure 16-2 (p. 14/...
J. Doe's user avatar
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