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參數(shù)資料
| 型號： | SP708TEP |
| 英文描述： | +3.0V/+3.3V Low Power Microprocessor Supervisory Circuits |
| 中文描述： | 3.0V / 3.3V低功耗微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 213K |
| 代理商： | SP708TEP |
13
Rev. 10-17-00 SP706 +3.0/ +3.3 Low Power Microprocessor Circuits Copyright 2000 Sipex Corporation
output is driven HIGH and the
μ
P wants to pull
it LOW, indeterminate logic levels may result.
To correct this, connect a 4.7k
resistor
between the RESET output and the
μ
P reset
I/O, as shown if
Figure 19
. Buffer the
RESET output to other system components.
Negative-Going V
CC
Transients
While issuing resets to the
μ
P during power-up,
power-down, and brownout conditions, these
supervisors are relatively immune to short-
duration negative-going V
transients (glitches).
It is usually undesirable to reset the
μ
P when V
CC
experiences only small glitches.
Figure 20
shows maximum transient dura-
tion vs. reset-comparator overdrive, for which
reset pulses are not generated. The data was gen-
erated using negative-going V
pulses, starting
at 3.3V and ending below the reset threshold by
Figure 18. Monitoring a Negative Voltage Supply
Figure 19. Interfacing to Microprocessors with
Bidirectional RESET I/O for the SP706
PFI
PFO
R
2
R
1
V
CC
+3.3V/+3.0V
GND
PFO
V-
+3.3V
V
TRIP
0V
0V
V
CC
- 1.25
1.25 - V
TRIP
R
1
R
2
V-
=
100k
100k
RESET
to
μ
P
2N3904
, V
TRIP
< 0
V-
MR
0V
+3.3V
MR
the magnitude indicated (reset comparator over-
drive). The graph shows the maximum pulse
width a negative-going V
transient may
typically have without causing a reset pulse to
be issued. As the amplitude of the transient
increases (i.e. goes farther below the reset
threshold), the maximum allowable pulse width
decreases. Typically, a V
transient that goes
100mV below the reset threshold and lasts for
40
μ
s or less will not cause a reset pulse to be
issued. A 100nF bypass capacitor mounted close
to the V
CC
pin provides additional transient
immunity.
Applications
The SP706P/R/S/T-SP708R/S/T series offers
unmatched performance and the lowest power
consumption for these industry standard de-
vices. Refer to
Figures 21
and
22
for supply
current performance characteristics rated against
temperature and supply voltages.
V
CC
+3.3V/+3.0V
GND
V
CC
+3.3V/+3.0V
GND
RESET
RESET
4.7K
μ
P
Buffered RESET connects to System Components
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|---|---|
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