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PDF NE56632-xx Data sheet ( Hoja de datos )
| Número de pieza | NE56632-xx | |
| Descripción | Active-LOW system reset | |
| Fabricantes | NXP Semiconductors | |
| Logotipo |  |
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INTEGRATED CIRCUITS
NE56632-XX
Active-LOW system reset
with adjustable delay time
Product data
2002 Mar 25
Philips
Semiconductors
1 page  
Philips Semiconductors
Active-LOW system reset with adjustable delay time
Product data
NE56632-XX
TYPICAL PERFORMANCE CURVES, NE56632-20
2.0050
2.0025
2.0000
1.9975
1.9950
1.9925
1.9900
Test Circuit 1
1.9875
1.9850
VCC = HIGH-to-LOW
RL = 4.7 kΩ
VOL ≤ 0.4 V
S1 = ON
–40 –20 0 20 40 60 80 100
AMBIENT TEMPERATURE, Tamb (°C)
SL01620
Figure 3. Detection threshold versus temperature.
0.225
0.220
0.215
0.210
0.205
0.200
0.195
0.190
0.185
–40
–20
0 20
Test Circuit 1
VCC1 = VS(min) – 0.05 V
RL = 4.7 kΩ
S1 = ON
40 60 80 100
AMBIENT TEMPERATURE, Tamb (°C)
SL01622
Figure 5. LOW-level output voltage versus temperature.
4.5
4.0
3.5
3.0
2.5
Test Circuit 1
RL = ∞
VCC1 = VS(typ)/0.85
2.0
–40 –20
0 20
40 60 80 100
AMBIENT TEMPERATURE, Tamb (°C)
SL01624
Figure 7. Supply current (OFF time) versus temperature.
100
90
80
70
60
50
Test Circuit 1
40
VCC = LOW-to-HIGH-to-LOW
RL = 4.7 kΩ
S1 = ON
30
–40 –20 0 20 40 60 80 100
AMBIENT TEMPERATURE, Tamb (°C)
SL01621
Figure 4. Hysteresis voltage versus temperature.
9
8
7
6
5
4 Test Circuit 1
VCC1 = VS(min) – 0.05 V
RL = ∞
3
–40 –20 0 20 40 60 80 100
AMBIENT TEMPERATURE, Tamb (°C)
SL01623
Figure 6. Supply current (ON time) versus temperature.
0.9
0.8
0.7
0.6
0.5
Test Circuit 1
0.4 RL = 4.7 kΩ
VOL ≤ 0.4 V
S1 = ON
0.3
–40 –20 0 20 40 60 80 100
AMBIENT TEMPERATURE, Tamb (°C)
SL01625
Figure 8. Min. operating threshold voltage versus temperature.
2002 Mar 25
5
5 Page 
Philips Semiconductors
Active-LOW system reset with adjustable delay time
Product data
NE56632-XX
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 Ω. To ensure that the
Active-LOW level is sufficient, a value of 4.7 kΩ is chosen in the test
and application examples.
TO VCC
RPU
54
TO RESET
TERMINAL
OF CPU
NE56632-XX
12 3
CD
SL01605
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 µs
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 (µF) × 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.
1.0E+00
1.0E–01
1.0E–02
1.0E–03
1.0E–04
1.0E–05
1.0E+00
1.0E+01
1.0E+02
CD (pF)
1.0E+03
1.0E+04
SL01611
Figure 25. NE56632-20 CD versus tPLH characteristics.
1.0E+00
1.0E–01
1.0E–02
1.0E–03
1.0E–04
1.0E–05
1.0E+00
1.0E+01
1.0E+02
CD (pF)
1.0E+03
1.0E+04
SL01612
Figure 26. NE56632-44 CD versus tPLH characteristics.
Table 2. Delay time coefficient
Device
NE56632–46
NE56632–45
NE56632–44
NE56632–43
NE56632–42
NE56632–31
NE56632–30
NE56632–29
NE56632–28
NE56632–27
NE56632–20
NE56632–19
d
1.95 × 104
1.90 × 104
1.85 × 104
1.80 × 104
1.75 × 104
1.20 × 104
1.15 × 104
1.10 × 104
1.05 × 104
1.00 × 104
0.65 × 104
0.60 × 104
2002 Mar 25
11
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