11

S93WD462/S93WD463

2029

2.2 1/23/01

SUMMIT MICROELECTRONICS, Inc.

Frequently the reset controller will be deployed on a PC board that provides a peripheral function to a system.

Examples might be modem or network cards in a PC or a PCMCIA card in a laptop. In instances like this the peripheral

card may have a requirement for a clean reset function to insure proper operation. The system may or may not provide

a reset pulse of sufficient duration to clear the peripheral or to protect data stored in a nonvolatile memory.

The I/O capability of the RESET pins can provide a solution. The system’s reset signal to the peripheral can be fed

into the S93WD462/WD463 and it in turn can clean up the signal and provide a known entity to the peripheral’s circuits.

The figure below shows the basic timing characteristics under the assumption the reset input is shorter in duration

When planning your resistor pull-up and pull-down values, use the following chart to help determine min. resistances.

Condition

Min

Typ

Max

Units

0.3

V

0.3

V

0.3

V

0.3

V

0.3

V

0.4

V

0.4

V

0.4

V

0.4

V

0.4

V

V

V

V

V

V

Parameter

Symbol

RESET# Output

Voltage

RESET# Output

Voltage

RESET Output

Voltage

2029 PGM T5.0

RESET#

Input

RESET#

Output

RESET

Output

2029 T fig09 2.0