ISL88042IRTEEZ-T 데이터 시트보기 (PDF) - Intersil
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ISL88042IRTEEZ-T Datasheet PDF : 8 Pages
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ISL88042
The ISL88042EVAL1Z and Applications
The ISL88042EVAL1Z supports all variants of the ISL88042
devices, enabling evaluation of basic functional operation and
common application implementations. Figure 10 illustrates the
ISL88042EVAL1Z in schematic and photographic forms. The
ISL88042EVAL1Z is populated with the ISL88042IRTEEZ
(VDD VTH1 and V2MON VTH2 = 2.90V).
With adequate bias on the two preset and the two adjustable
monitor inputs the RST output will release to pull high
indicating that all supplies are compliant for a minimum of
tPOR. For the ISL88042EVAL1Z as shipped, the VDD and
V2MON nominal thresholds are as previously noted with the
voltage thresholds being monitored by V3MON and V4MON
being left open for programming via the non populated
resistor dividers.
Typical Performance Curves
3.20
4.60
3.15
ISL88042IRTHF VDD
4.59
3.10
3.05 ISL88042IRTHF V2MON
4.58
3.00 ISL88042IRTEE V2MON
4.57
2.95
2.90 ISL88042IRTEE VDD
4.56
2.85
4.55
2.80 ISL88042IRTJJ V2MON
4.54
2.75 ISL88042IRTJJ VDD
2.70 -40 -20
4.53
0 25 50 85 100 125
TEMPERATURE (°)
FIGURE 4. VDD and V2MON Vth vs TEMPERATURE
Special Application Considerations
Using good decoupling practices on bias and other
monitoring inputs will prevent transients (i.e. due to switching
noises and short duration droops in the supply voltage) from
causing unwanted resets.
In unusually noisy environments or situations where
unwanted signals may be injected into the adjustable VMON
inputs, lowering the node impedance and/or positioning a
small valued filter capacitor as close to the pin as possible
can increase noise immunity.
Although the internal ISL88042 threshold references are
guaranteed over the full temp range, accuracy errors due to
external component tolerances and distribution losses will
occur. High tolerance resistors and layout for extreme
accuracy and critical performance must be considered.
610
605
ISL88042IRTHF ISL88042IRTEE V4MON
600
595
ISL88042IRTHF ISL88042IRTEE V3MON
590
ISL88042IRTJJ V4MON
585
580
575 ISL88042IRTJJ V3MON
570
-40 -20
0 25 50 85 100 125
TEMPERATURE (°C)
FIGURE 5. V3MON and V4MON Vth vs TEMPERATURE
120
115
110
105
100
95
90
85
80 -40 -20
0 25 50 85 100 125
TEMPERATURE (°C)
FIGURE 6. tpor vs TEMPERATURE
16
14
VDD = 5V
12
10
8
6
4
V2MON = 3.3V
2
0
-40 -20
0 25 50 85 100 125
TEMPERATURE (°C)
FIGURE 7. BIAS CURRENT vs TEMPERATURE
6
FN6655.2
July 26, 2010
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