ELANSC310 datasheet(88/119 Pages) AMD

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Élan™SC310 Microcontroller Data Sheet

PREL IMINARY

AC Switching Characteristics over Commercial Operating Ranges

Notes:

1. This parameter is dependent on the 32 kHz oscillator start-up time. The oscillator start-up time is dependent on the external

component values used, board layout, and power supply noise. For more information, see “Crystal Specifications” on page

84.

2. RESIN remains inactive during Micro Power Off mode and Micro Power Off mode exit.

3. The pulse width of RSTDRV is adjustable based on PLL start-up timing. See “Loop Filters” on page 86 for more information.

Voltage sequencing on power-up for the ÉlanSC310 microcontroller should be observed as follows:

–VCC

– All VCC clamp sources (VCC, VMEM, VSYS, VCC5, and AVCC)

– All VCCIO sources (VCC5, VMEM, VSYS, VCC1, VSYS2, and AVCC)

The reverse is true when powering down. For any particular I/O pin, the VCCIO may come up simultaneously with the VCC clamp,

but should never proceed the VCC clamp. Refer to the Pin Characteristics table (page 21) for detailed I/O information.

Table 45.

Power-Up Sequencing (See Figures 32–35)

Symbol

Parameter Description

Notes

Preliminary

Unit

Min

Typ

Max

All VCC valid to RESIN and IORESET inactive

1, 2

RESIN and IORESET inactive to RSTDRV inactive

2, 3

300

µs

IORESET active to RSTDRV active

VSYS2, VCC1, and VSYS valid delay from VCC5

VSYS2, VCC1, VSYS, and optionally VMEM valid to

IORESET inactive

µs

VCC5, VSYS2, VCC1, VSYS hold time from IORESET

active

µs

VCC5 hold time from VSYS2, VCC1, and VSYS inactive

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