SN74HCS126: SN74HCS126

C S

Prodigy 100 points

Part Number: SN74HCS126
Other Parts Discussed in Thread: SN74AHCT1G125, UCC27517, SN74AHCT125

Tool/software:

Dear TI team,

I am going to use IC- SN74HCS126 to buffer uC 3.3V PWM (Freq- 50 kHz to 500 kHz) to 5V logic level.

I need to confirm below points;

1. Can this IC work on PWM with mentioned freq? As I am using this between uC and Driver IC of Mosfet, to feed 5V PWM to the Mosfet driver.(3.3v PWM from uC buffered to 5V via this IC- SN74HCS126)

2. What is the minimum Pulse width required in input side to have output ??

Please help with this.

4 months ago

0 Clemens Ladisch 4 months ago

Guru 316440 points

HCS devices do not support 3.3 V input signals with a 5 V supply. You need a level shifter, or a device with TTL-compatible inputs like the SN74AHCT1G125.

If you do not have better information, then the minimum pulse width is the worst-case propagation delay.

Consider using a gate driver with 3.3 V-compatible inputs like the UCC27517.

0 C S 4 months ago in reply to Clemens Ladisch

Prodigy 100 points

Thanks for response,

Please confirm, will this PN suitable?? - SNx4AHCT125

I need to confirm below points;

1. Can this IC work on PWM with 20kHz to 100 kHz freq? As I am using this between uC and Driver IC of Mosfet, to feed 5V PWM to the Mosfet driver.(3.3v PWM from uC buffered to 5V via this IC- SNx4AHCT125 )

2. What is the minimum Pulse width required in input side to have output ??

0 Clemens Ladisch 3 months ago in reply to C S

Guru 316440 points

1. Yes, both the SN74AHCT1G125 and SN74AHCT125 will work.

2. The minimum pulse width is the worst-case propagation delay.

0 C S 3 months ago in reply to Clemens Ladisch

Prodigy 100 points

Thanks for the quick resolution.

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SN74HCS126: SN74HCS126