Rev 1.0
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38
Reference Guide
Signals and Indicators
Table 25. USR3500 Reset Status
(Serial
Port) Pin #
Signal
I/O
I/O Type
Voltage
Description
14
Reset
I/O
Open drain
1V8
USR3500 Reset
Table 26. Reset Electrical Characteristics for USR3500
Parameter
Minimum
Typical
Maximum
Unit
Input Impedance (R)*
10
k
Ω
Input Impedance (C)
20
nF
*
Internal pull-up
Table 27. Reset Operating Conditions
Parameter
Minimum
Typical
Maximum
Unit
~Reset time (Rt)
1
200
µ
s
~Reset time (Rt)
2
(at power up only)
20
40
100
ms
Cancellation time (Ct)
34
ms
V
H
*
0.57
V
V
IL
0
0.57
V
V
IH
1.33
V
*
V
H
= Hysterisis Voltage
1:
This reset time is the minimum to be carried out on the ~Reset signal when the power supply is stabilized.
2:
This reset time is internally carried out by the embedded module power supply supervisor only when the
embedded module power supplies are powered ON.
