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
cardmayhavearequirementforacleanresetfunctiontoinsureproperoperation. Thesystemmayormaynotprovide
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
intotheS93WD462/WD463anditinturncancleanupthesignalandprovideaknownentitytotheperipheral’scircuits.
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
2029 ILL 12.0
When planning your resistor pull-up and pull-down values, use the following chart to help determine min. resistances.
Worst Case RESET Sink/Source Capabilities at Various VCC Levels
Parameter
Symbol
Condition
Min
Typ
Max
0.3
0.3
0.3
0.3
0.3
0.4
0.4
0.4
0.4
0.4
Units
VCC = 1.0V, IOL=100µA
VCC = 1.2V, IOL=100µA
VCC = 3.0V, IOL=500µA
VCC = 3.6V, IOL=500µA
VCC = 4.5V, IOL=750µA
VCC = 1.0V, IOL=100µA
VCC = 1.2V, IOL=150µA
VCC = 3.0V, IOL=750µA
VCC = 3.6V, IOL=1mA
VCC = 4.5V, IOL=1mA
VCC = 1.0V, IOH=400µA
VCC = 1.2V, IOH=800µA
VCC = 3.0V, IOH=800µA
VCC = 3.6V, IOH=800µA
VCC = 4.5V, IOH=800µA
V
V
V
V
V
V
V
V
V
V
V
V
V
V
RESET Output
VOL
Voltage
RESET Output
VOL
Voltage
VCC-0.75
VCC-0.75
VCC-0.5
VCC-0.5
VCC-0.5
RESET Output
Voltage
VOH
V
2029 PGM T5.0
2029-01 4/14/98
11
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
