ELANSC310 datasheet(87/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

AC SWITCHING CHARACTERISTICS AND WAVEFORMS

The AC specifications provided in the AC characteris-

tics tables that follow consist of output delays, input

setup requirements, and input hold requirements. Fig-

ure 31 provides a key to the switching waveforms.

AC specifications measurement is defined by the fig-

ures that follow each timing table.

Output delays are specified with minimum and maxi-

mum limits, measured as shown. The minimum delay

times are hold times provided to external circuitry.

Input setup and hold times are specified as minimums,

defining the smallest acceptable sampling window.

Within the sampling window, a synchronous input sig-

nal must be stable for correct microcontroller operation.

Figure 31.

Key to Switching Waveforms

AC Switching Test Waveforms

Notes:

For AC testing, inputs are driven at 3 V for a logic 1 and 0 V for a logic 0.

WAVEFORMS

INPUTS

OUTPUTS

Must be Steady

Will be Steady

May Change from H to L

Will be Changing from H to L

May Change from L to H

Will be Changing from L to H

Don’t Care, Any Change Permitted

Changing, State Unknown

Does Not Apply

Center Line is High-Impedance “Off” State

VCC

÷ 2

VCC

÷ 2

VIH = VCC

Input

VIL = 0

Test Points

Output

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