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MAX708ESA-TG 数据手册 - ON Semiconductor（安森美）
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电源监控芯片
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SOIC-8
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MAX708ESA-TG数据手册
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若手册格式错乱，请下载阅览PDF原文件
MAX707, MAX708
http://onsemi.com
6
APPLICATIONS INFORMATION
Microprocessor Reset
To generate a processor reset, the manual Reset input
allows different reset sources. A pushbutton switch can be
one of these. It is effectively debounced by the 1.0 ms
minimum reset pulse width. As MR is TTL/CMOS logic
compatible, it can be driven by an external logic line.
V
CC
RESET
Figure 12. RESET and MR Timing
MR
V
TH
V
TH
t
RP
t
RP
t
MD
t
MR
V
CC
Transient Rejection
The MAX707/708 provides accurate V
CC
monitoring and
reset timing during power−up, power−down, and
brownout/sag conditions, and rejects negative glitches on
the power supply line. Figure 13 shows the maximum
transient duration vs. maximum negative excursion
(overdrive) for glitch rejection. For a given overdrive, the
point of the curve is the maximum width of the glitch
allowed before the device generates a reset signal. Transient
immunity can be improved by adding a capacitor (100 nF for
example) in close proximity to the V
CC
pin of the
MAX707/708.
300
250
150
200
100
50
0
Figure 13. Maximum Transient Duration vs.
Overdrive for Glitch Rejection at 255C
RESET COMPARATOR OVERDRIVE (mV)
MAXIMUM TRANSIENT DURATION (ms)
10 90705030 110 130 150
V
TH
V
CC
Duration
Overdrive
V
TH
= 4.90 V
V
TH
= 3.08 V
V
TH
= 1.60 V
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