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參數(shù)資料
| 型號： | 935270986115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | 1.50 MM, PLASTIC, SOT-23, SOT-25, SO-5 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大?。?/td> | 174K |
| 代理商： | 935270986115 |
Philips Semiconductors
Product data
NE56632-XX
Active-LOW system reset with adjustable delay time
2002 Mar 25
11
APPLICATION INFORMATION
A typical application circuit for the NE56632-XX is shown in
Figure 24. Note that a pull-up resistor, RPU is necessary since the
output is an open collector. The value of RPU is calculated by the
following expression.
RPU ≥ (VCC – VRESET) / IOL
where:
VCC = VS(min) – 0.05 V (for a 3 V reset this is 2.905 V)
VRESET = 0.4 V (this is VOL(max))
IOL = 5 mA; minimum output current at Tamb = 25 °C
Substituting these values into the expression and calculating, finds
RPU should be greater than or equal to 510 . To ensure that the
Active-LOW level is sufficient, a value of 4.7 k
is chosen in the test
and application examples.
12
3
4
5
NE56632-XX
RPU
TO RESET
TERMINAL
OF CPU
SL01605
CD
TO VCC
Figure 24. Typical application.
Figure 25 (NE56632-20 CD versus tPLH) and Figure 26
(NE56632-44 CD versus tPLH) show how tPHL, the “H” transmission
delay or reset release delay time varies as a function of the external
delay capacitance, CD. From Figure 26, typical range of the delay
capacitance is 1 pF to 10 nF which yields typical delays from 200
s
to 200 ms.
The following formula can be used to find the approximate delay
time based on external delay capacitance, CD and the delay time
coefficient, d shown in Table 2.
tPLH (ms) ≈ CD (F) × d
For example, a NE56632-44 using an external capacitor,
CD = 1 nF = 1000 pF yields:
tPLH (ms) ≈ (1 × 10–3) (1.85 × 104) ≈ 18.5 ms
Compare this to the value of tPLH ≈ 17 ms for CD = 1000 pF that is
extracted from Figure 26.
SL01611
CD (pF)
t
PLH
(s)
1.0E+01
1.0E+02
1.0E+03
1.0E+00
1.0E+04
1.0E–01
1.0E–02
1.0E–03
1.0E–04
1.0E–05
Figure 25. NE56632-20 CD versus tPLH characteristics.
SL01612
CD (pF)
t
PLH
(s)
1.0E+01
1.0E+02
1.0E+03
1.0E+00
1.0E+04
1.0E–01
1.0E–02
1.0E–03
1.0E–04
1.0E–05
Figure 26. NE56632-44 CD versus tPLH characteristics.
Table 2. Delay time coefficient
Device
d
NE56632–46
1.95
× 104
NE56632–45
1.90
× 104
NE56632–44
1.85
× 104
NE56632–43
1.80
× 104
NE56632–42
1.75
× 104
NE56632–31
1.20
× 104
NE56632–30
1.15
× 104
NE56632–29
1.10
× 104
NE56632–28
1.05
× 104
NE56632–27
1.00
× 104
NE56632–20
0.65
× 104
NE56632–19
0.60
× 104
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