S93WD462/S93WD463
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 than tPURST. The same reset output affect can be attained by using the active high reset input.
RESET#
Input
RESET#
Output
RESET |
|
Output | t PURST |
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2029 T fig09 2.0
When planning your resistor
Worst Case RESET Sink/Source Capabilities at Various VCC Levels
| Parameter | Symbol | Condition |
| Min | Typ | Max | Units |
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|
| VCC = 1.0V, IOL=100µA |
|
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| 0.3 | V |
| RESET# Output | VOL | VCC = 1.2V, IOL=100µA |
|
|
| 0.3 | V |
| Voltage |
| VCC = 3.0V, IOL=500µA |
|
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| 0.3 | V |
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| VCC = 3.6V, IOL=500µA |
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| 0.3 | V |
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| VCC = 4.5V, IOL=750µA |
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| 0.3 | V |
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| VCC = 1.0V, IOL=100µA |
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| 0.4 | V |
| RESET# Output | VOL | VCC = 1.2V, IOL=150µA |
|
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| 0.4 | V |
| Voltage |
| VCC = 3.0V, IOL=750µA |
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| 0.4 | V |
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| VCC = 3.6V, IOL=1mA |
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| 0.4 | V |
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| VCC = 4.5V, IOL=1mA |
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| 0.4 | V |
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| VCC = 1.0V, IOH=400µA |
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| V | |
| RESET Output | VOH | VCC = 1.2V, IOH=800µA |
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| V | |
| Voltage |
| VCC = 3.0V, IOH=800µA |
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| V | |
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| VCC = 3.6V, IOH=800µA |
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| V | |
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| VCC = 4.5V, IOH=800µA |
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| V | |
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| 2029 PGM T5.0 |
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SUMMIT MICROELECTRONICS, Inc. | 2029 2.2 | 1/23/01 |
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