ISL88042 Intersil Corporation, ISL88042 Datasheet - Page 6

• Manufacturer Part Number: ISL88042
• Description: Quadruple Voltage Monitor
• Manufacturer: Intersil Corporation

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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
(V
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
t
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
POR
DD
. For the ISL88042EVAL1Z as shipped, the V
FIGURE 4. VDD and V2MON Vth vs TEMPERATURE
V
3.20
3.15
3.10
3.05
3.00
2.95
2.90
2.85
2.80
120
105
100
115
110
TH1
95
90
85
80
ISL88042IRTHF V2MON
-40
and V2MON V
-40
FIGURE 6. t
ISL88042IRTHF VDD
ISL88042IRTEE V2MON
-20
-20
0
TEMPERATURE (°C)
0
TEMPERATURE (°C)
por
TH2
25
vs TEMPERATURE
25
ISL88042IRTEE VDD
6
= 2.90V).
50
50
85
85
100
100
125
DD
125
and
4.60
4.59
4.58
4.57
4.56
4.55
4.54
4.53
ISL88042
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.
FIGURE 5. V3MON and V4MON Vth vs TEMPERATURE
FIGURE 7. BIAS CURRENT vs TEMPERATURE
16
14
12
10
602
601
600
599
598
597
596
595
594
593
592
8
6
4
2
0
-40
-40
V2MON = 3.3V
-20
-20
V3MON
0
TEMPERATURE (°C)
0
TEMPERATURE (°C)
25
25
50
50
V4MON
85
85
VDD = 5V
100
100
June 8, 2009
125
125
FN6655.1