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RNA51957APT0 Datasheet(PDF) 11 Page - Renesas Technology Corp

Part # RNA51957APT0
Description  Voltage Detecting, System Resetting IC Series
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

RNA51957APT0 Datasheet(HTML) 11 Page - Renesas Technology Corp

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RNA51957A, B
Preliminary
R03DS0010EJ0500 Rev.5.00
Page 11 of 13
Jun 19, 2012
Setting of Delay Capacity
Please use capacitor Cd for the delay within the range of 10
F or less.
When a value that is bigger than this is set, the problem such as following (1), (2), and (3) becomes remarkable.
t
VCC
Output
tpd
tPHL
Figure 9 Time Chart at Momentary Voltage-Decrease
(1) The difference at delay time becomes remarkable.
A long delay setting of tens of seconds is fundamentally possible. However, when set delay time is lengthened, the
range of the difference relatively grows, too. When a set value is assumed to be ‘tpd’, the difference occurs in the
range from 0.47
 tpd to 2.05  tpd. For instance, 34 seconds can be calculated at 100 F. However, it is likely to
vary within the ranges of 16-70 seconds.
(2) Difficulty to react to a momentary voltage decrease.
For example, the reaction time tPHL is 10 s when delay capacitor Cd = 0.1 F.
The momentary voltage-decrease that is longer than such tPHL are occurs, the detection becomes possible. When the
delay capacitance is enlarged, tPHL also becomes long. For instance, it becomes about 100 to 200 s in case of
circuit constant C1 = 100
F.
(Characteristic graph 1 is used and extrapolation in case of Cd = 100
F.)
Therefore, it doesn't react to momentary voltage-decrease that is shorter than this.
(3) Original delay time is not obtained.
When the momentary voltage-decrease time ‘t’ is equivalent to tPHL, the discharge becomes insufficient and the
charge starts at that state. This phenomenon occurs at large capacitance. And, original delay time tpd is not
obtained.
Please refer to characteristic graph 2. (Delay time versus input pulse width)
0.01
0.1
1
Delay Capacitance Cd (
μF)
10
100
1000
1
10
100
200
1
10
100
Pulse Width (
μs)
Characteristic Graph 2
Delay Time vs. Momentary Voltage Decrease Pulse Width
(Example data)
Characteristic Graph 1
Reaction Time vs. Delay Capacitance
(Example data)
1000
10000
10000
1000
100
10
1
0.01
μF
Delay Capacitance
0.033
μF
0.1
μF
0.33
μF
1
μF
2.2
μF
3.3
μF
Figure 10 Characteristic Graph


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