PEB 2091
PEF 2091
Electrical Characteristics
8.7.5
Undervoltage Detection Timing
The timing of the undervoltage detection function is given below.
Vdd
U
H
U
L
1.0V
RST
T
d
T
d
T
r
Figure 118 UVD Timing Characteristics
Table 55
Timing Parameters of UVD Function
Symbol Limit Values
Parameter
Unit
min.
4.1
typ.
4.3
max.
Upper threshold voltage
Lower threshold voltage
Length of reset pulse
UH
UL
Tr1)
4.5
V
UH -0.11
67
UH -0.085 UH -0.05
V
ms
µs
Delay of the reset generation Td
after the threshold voltage has
been passed
0
10
20
Slope of the rise and fall time of dV/dt
VDD at every point of time
0
104
V/s
1) Note that this specification holds only if stability of the 15.36 MHz clock is guaranteed. During power-up, the
reset pulse may therefor vary slightly from the value mentioned above due to instability of the oscillator during
start up
Semiconductor Group
280
Data Sheet 01.99
INFINEON [ Infineon ]
