PEF2091 Siemens Semiconductor Group, PEF2091 Datasheet - Page 280

• Manufacturer Part Number: PEF2091
• Description: ICs for Communications(ISDN Echocancellation Circuit)
• Manufacturer: Siemens Semiconductor Group

Semiconductor Group
8.7.5
The timing of the undervoltage detection function is given below.
Figure 118
Table 55
Parameter
Upper threshold voltage
Lower threshold voltage
Length of reset pulse
Delay of the reset generation
after the threshold voltage has
been passed
Slope of the rise and fall time of
VDD at every point of time
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
Vdd
1.0V
RST
U
U
H
L
Undervoltage Detection Timing
UVD Timing Characteristics
Timing Parameters of UVD Function
T
d
T
U
T
Symbol
U
T
dV/dt
r
r
d
H
L
1)
280
Limit Values
min.
4.1
U
67
0
0
H
-0.11
typ.
4.3
U
10
H
-0.085
Electrical Characteristics
T
d
max.
4.5
U
20
10
H
4
Data Sheet 01.99
-0.05
PEB 2091
PEF 2091
V
V
ms
µs
V/s
Unit