參數(shù)資料
型號(hào)： MAX808NESA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 電源管理
英文描述： Interface IC
中文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： 0.150 INCH, SO-8
文件頁(yè)數(shù)： 11/12頁(yè)
文件大小： 91K
代理商： MAX808NESA
Chip-Enable Output
In enabled mode,
CE
OUT’s impedance is equivalent to
75
in series with the source driving
CE
IN. In disabled
mode, the 75
transmission gate is off and
CE
OUT is
actively pulled to the higher of V
CC
or V
BATT
. The
source turns off when the transmission gate is enabled.
__________Applic ations Information
The MAX801/MAX808 are not short-circuit protected.
Shorting OUT to ground, other than power-up transients
such as charging a decoupling capacitor, may destroy
the device. If long leads connect to the IC’s inputs,
ensure that these lines are free from ringing and other
conditions that would forward bias the IC’s protection
diodes. Bypass OUT, V
CC
, and BATT with 0.1μF
capacitors to GND.
The MAX801/MAX808 operate in two distinct modes:
1) Normal Operating Mode, with all circuitry powered
up. Typical supply current from V
CC
is 68μA (48μA
for the MAX808), while only leakage currents flow
from the battery.
2) Battery-Backup Mode, where V
CC
is below V
BATT
and V
RST
. The supply current from the battery is typ-
ically less than 1μA.
Using S uperCaps or MaxCaps
with the MAX 801/MAX 808
BATT has the same operating voltage range as V
CC
, and
the battery-switchover threshold voltage is typically
V
BATT
when V
CC
is decreasing or V
BATT
+ 0.05V when
V
CC
is increasing. This hysteresis allows use of a
SuperCap (e.g., around 0.47F) and a simple charging
circuit as a backup source (Figure 8). Since V
BATT
can
exceed V
CC
while V
CC
is above the reset threshold, no
special precautions are needed when using these μP
supervisors with a SuperCap.
Bac kup-Battery Replac ement
The backup battery can be disconnected while V
CC
is
above the reset threshold, provided BATT is bypassed
with a 0.1μF capacitor to ground. No precautions are
necessary to avoid spurious reset pulses.
Negative-Going V
CC
T ransients
While issuing resets to the μP during power-up, power-
down, and brownout conditions, these supervisors are
relatively immune to short-duration, negative-going V
CC
transients (glitches). It is usually undesirable to reset
the μP when V
CC
experiences only small glitches.
The Typical Operating Characteristics show a graph of
Maximum Transient Duration vs. Reset Threshold
Overdrive, for which reset pulses are not generated.
The graph was produced using negative-going V
CC
pulses, starting at 5V and ending below the reset
threshold by the magnitude indicated (reset compara-
tor overdrive). The graph shows the maximum pulse
width that a negative-going V
CC
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
CC
transient that
goes 40mV below the reset threshold and lasts for 3μs
or less will not cause a reset pulse to be issued. A
0.1μF bypass capacitor mounted close to the V
CC
pin
provides additional transient immunity.
M
8-Pin μP S upervisory Circ uits
with ±1.5% Reset Ac c urac y
______________________________________________________________________________________
11
MAX808
CE IN
50pF C
LOAD
CE OUT
GND
V
RST
(max)
50
DRIVER
V
CC
Figure 7. MAX808 CE Gate Test Circuit
MAX801
MAX808
0.47F
1N4148
+5V
V
CC
GND
BATT
OUT
Figure 8. Using the MAX801/MAX808 with a SuperCap
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MAX808NESA+ 功能描述:監(jiān)控電路 8-Pin uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX808NESA+T 功能描述:監(jiān)控電路 8-Pin uPower Supervisor RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX808NESA-T 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX808NMJA 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測(cè)電壓數(shù): 監(jiān)測(cè)電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel
MAX809 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Very Low Supply Current 3-Pin Microprocessor Reset Monitors
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