TLE 42794GM Infineon Technologies, TLE 42794GM Datasheet - Page 17

• Manufacturer Part Number: TLE 42794GM
• Manufacturer: Infineon Technologies

Specifications of TLE 42794GM

• Packages: PG-DSO-14
• Regulator Type: single output
• Output Voltage: 5V
• Accuracy: 2.0 %
• Max. Output Current: 100mA
• Dropout Voltage: 250mV

5.6
The reset function provides several features:
Output Undervoltage Reset:
An output undervoltage condition is indicated by setting the Reset Output RO to “low”. This signal might be used
to reset a microcontroller during low supply voltage.
Power-On Reset Delay Time:
The power-on reset delay time
from exceeding the reset switching threshold
“low” to “high”. The power-on reset delay time
charged by the delay capacitor charge current
If the application needs a power-on reset delay time
capacitor’s value can be derived from the specified values in
with
•
•
•
For a precise calculation also take the delay capacitor’s tolerance into consideration.
Reset Reaction Time:
The reset reaction time avoids that short undervoltage spikes trigger an unwanted reset “low” signal. The reset
reaction rime
capacitor
with
•
•
•
Data Sheet
C
t
t
t
t
t
rd,new
rr
rr,int
rd
rr,d
D
: reset reaction time
: power-on reset delay time specified in this datasheet
: capacitance of the delay capacitor to be chosen
: reset discharge
: internal reset reaction time
: desired power-on reset delay time
C
C
D
D
t
rr
Reset Function
(see typical performance graph for details). Hence, the total reset reaction time becomes:
t
=
rr
=
t
----------------
considers the internal reaction time
t
rd new
rd int
t
,
rd
,
+
×
t
47nF
rr d ,
t
rd
allows a microcontoller and oscillator to start up. This delay time is the time frame
V
RT
t
I
rd
D,ch
until the reset is released by switching the reset output “RO” from
is defined by an external delay capacitor
starting from
t
rr,int
t
17
rd
and the discharge time
different from the value given in
Block Description and Electrical Characteristics
Item 5.6.7
V
D
= 0 V.
and the desired power-on delay time:
t
rr,d
defined by the external delay
C
Rev. 1.1, 2008-10-09
Item
D
connected to pin D
5.6.7, the delay
TLE42794