At 10:58 AM 1/24/03 -0800, you wrote:
>Can an input of a PIC be connected directly to VDD to set a High level ?
>What about other digital IC's such as 74HCXXX or FPGA's ?
>
>One of my guys here insists that input should be tied to VDD through a
>resistor.

Input-only can be tied to Vdd (except for old bipolar TTL parts).
Otherwise (bidirectional microcontroller pins) best to use a series
resistor.

Same with ground. You can safely tie an open drain output I/O to ground,
but other bi-di should be through an R.

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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