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參數(shù)資料
| 型號(hào)： | MAX6837FXSD0 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 8-Bit Identity/Magnitude Comparators 20-LCCC -55 to 125 |
| 中文描述： | 超低電壓SC70封裝電壓檢測(cè)器和レP復(fù)位電路 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大?。?/td> | 197K |
| 代理商： | MAX6837FXSD0 |
M
Detailed Description
Reset Output
A microprocessor
’
s (μP
’
s) reset input starts the μP in a
known state. The MAX6832
–
MAX6840 assert a reset to
prevent code-execution errors during power-up, power-
down, or brownout conditions. They also assert a reset
signal whenever the V
CC
supply voltage falls below a
preset threshold (MAX6832
–
MAX6837) or RESET-IN
falls below the adjustable threshold (MAX6838/
MAX6839/MAX6840), keeping reset asserted for a fixed
timeout delay (Table 2) after V
CC
or RESET-IN has risen
above the reset threshold. The MAX6832/MAX6835/
MAX6838 use a push-pull active-low output, the
MAX6833/MAX6836/MAX6839 have a push-pull active-
high output, and the MAX6834/MAX6837/MAX6840
have an open-drain active-low output stage. Connect a
pullup resistor on the MAX6834/MAX6837/MAX6840
’
s
RESET
output to any supply between 0 and 6V.
Manual Reset Input
Many μP-based systems require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while
MR
is low, and for a fixed timeout delay after
MR
returns high. This input has an internal 20k
pullup
resistor, so it can be left open if it is not used.
MR
can
be driven with CMOS logic level, or with open-drain/col-
lector outputs. To create a manual reset function, con-
nect a normally open momentary switch from
MR
to
ground; external debounce circuitry is not required. If
MR
is driven from long cables or if the device is used in
a noisy environment, connecting a 0.1μF capacitor from
MR
to ground provides additional noise immunity.
RESET-IN Information
The MAX6838/MAX6839/MAX6840 feature a RESET-IN
input for monitoring supply voltages down to 0.44V. An
external resistive-divider network can be used to set
voltage monitoring thresholds as shown in Figure 1. As
the monitored voltage falls, the voltage at RESET-IN
decreases and asserts a reset when it falls below the
RESET-IN threshold (V
RSTIN
). The low-leakage current
Ultra-Low-Voltage SC70 Voltage Detectors
and μP Reset Circuits
6
_______________________________________________________________________________________
MAX6838/
MAX6839/
MAX6840
RESET
TIMEOUT
PERIOD
RESET
OUTPUT
V
REF
= 444mV
RESET-IN
RESET/
RESET
GND
V
CC
V
CC
MAX6832–
MAX6837
RESET
TIMEOUT
PERIOD
MANUAL
RESET
DETECT
RESET
OUTPUT
V
REF
= 444mV
RESET/
RESET
GND
MR (MAX6835/MAX6836/MAX6837 ONLY)
MR
PULLUP
Functional Diagrams
V
MONITORED
R1
R2
RESET-IN
GND
RESET
(RESET)
V
CC
( ) ARE FOR MAX6839
MAX6838/
MAX6839/
MAX6840
R1 = R2 [(V
MONITORED
/V
REF
) -1]
WHERE V
MONITORED
IS THE DESIRED TRIP LEVEL,
V
REF
= 444mV
Figure 1. Setting the Adjustable Threshold Externally
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6837FXSD0-T | 8-Bit Identity/Magnitude Comparators 20-CDIP -55 to 125 |
| MAX6837FXSD3 | 8-Bit Identity/Magnitude Comparators 20-CFP -55 to 125 |
| MAX6837FXSD3-T | 8-Bit Identity/Magnitude Comparators (P=Q) with Enable 20-LCCC -55 to 125 |
| MAX6837VXSD0-T | 8-Bit Identity/Magnitude Comparators (P=Q) with Enable 20-CDIP -55 to 125 |
| MAX6837VXSD3 | 8-Bit Identity/Magnitude Comparators (P=Q) with Enable 20-CFP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6837FXSD0+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.05V 16UA 4PIN SC-70 - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6837FXSD0+T | 功能描述:監(jiān)控電路 Single uPower Reset Circuit 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(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX6837FXSD0-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(guò)電壓閾值: 輸出類(lèi)型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開(kāi)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 |
| MAX6837FXSD1 | 制造商:Maxim Integrated Products 功能描述:ULTRA-LOW-VOLTAGE SC70 VOLTAGE DETE - Cut Tape Product |
| MAX6837FXSD1+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 1.05V 16UA 4PIN SC-70 - Cut Tape Product |
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