TI SN74HC164PWR output drive

John Russo

Other Parts Discussed in Thread: SN74HC595B

All,

One of my customers is planning on using multiple TI SN74HC164PWR to drive LEDs. The data sheet specs the output drive at +/- 4mA at 5V. He is running the chip at Vcc = 3.3V. What is the output drive at 3.3V? I checked the data sheet and it doesn't specify the Iout (high or low) with Vcc set to 3.3V

Thanks for your support,

John

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John T. Russo

Senior Field Applications Engineer

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over 9 years ago

0 ShreyasRao over 9 years ago

TI__Guru 62240 points

Hi John ,

I do not have the char data to support the 3.3V vs Iout case ,however , I see the Vout vs Iout data on 2V case which could source 2mA and maintain >1.7V at 25C .
what is the desired source current to be supported and the min voh to be maintained on this ?

PS : could you also consider sn74HC595B which was recently released in the X1QFN package .
we are also working on TI design using Hc595B and LVC244A used for LED display driving.