ne56632-xx NXP Semiconductors, ne56632-xx Datasheet - Page 11

• Manufacturer Part Number: ne56632-xx
• Description: Active-low System Reset With Adjustable Delay Time
• Manufacturer: NXP Semiconductors

Philips Semiconductors
APPLICATION INFORMATION
A typical application circuit for the NE56632-XX is shown in
Figure 24. Note that a pull-up resistor, R
output is an open collector. The value of RPU is calculated by the
following expression.
where:
Substituting these values into the expression and calculating, finds
R
Active-LOW level is sufficient, a value of 4.7 k is chosen in the test
and application examples.
Figure 25 (NE56632-20 C
(NE56632-44 C
delay or reset release delay time varies as a function of the external
delay capacitance, C
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, C
coefficient, d shown in Table 2.
For example, a NE56632-44 using an external capacitor,
C
Compare this to the value of t
extracted from Figure 26.
2003 Oct 14
PU
D
Active-LOW system reset with adjustable delay time
R
V
V
I
t
t
= 1 nF = 1000 pF yields:
OL
PLH
PLH
should be greater than or equal to 510
PU
CC
RESET
= 5 mA; minimum output current at T
= V
(ms)
(ms)
(V
TO V
S(min)
= 0.4 V (this is V
CC
CC
C
(1
– V
D
D
versus t
– 0.05 V (for a 3 V reset this is 2.905 V)
Figure 24. Typical application.
( F)
RESET
10
D
C
. From Figure 26, typical range of the delay
–3
D
) (1.85
5
1
) / I
PLH
d
D
NE56632-XX
versus t
OL(max)
OL
) show how t
PLH
R
PU
2
10
)
PLH
17 ms for C
4
)
) and Figure 26
4
3
PU
18.5 ms
PHL
is necessary since the
amb
D
, the “H” transmission
and the delay time
To ensure that the
SL01605
D
= 25 C
= 1000 pF that is
TO RESET
TERMINAL
OF CPU
11
Table 2. Delay time coefficient
Figure 25. NE56632-20 C
Figure 26. NE56632-44 C
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
1.0E–03
1.0E–04
1.0E–05
NE56632–46
NE56632–45
NE56632–44
NE56632–43
NE56632–42
NE56632–31
NE56632–30
NE56632–29
NE56632–28
NE56632–27
NE56632–20
NE56632–19
1.0E+00
1.0E+00
Device
1.0E+01
1.0E+01
D
D
1.0E+02
1.0E+02
C
C
versus t
versus t
D
D
(pF)
(pF)
NE56632-XX
PLH
PLH
1.0E+03
1.0E+03
1.95
1.90
1.85
1.80
1.75
1.20
1.15
1.10
1.05
1.00
0.65
0.60
characteristics.
characteristics.
d
10
10
10
10
10
10
10
10
10
10
10
10
1.0E+04
1.0E+04
4
4
4
4
4
4
4
4
4
4
4
4
Product data
SL01611
SL01612