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參數(shù)資料
| 型號： | MAX6738XKTD3-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | Low-Power Dual-/Triple-Voltage SC70 UP Supervisory Circuits |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO5 |
| 封裝： | EIAJ, SC-70, 5 PIN |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 209K |
| 代理商： | MAX6738XKTD3-T |
M
Low-Power Dual-/Triple-Voltage SC70 μP
Supervisory Circuits
______________________________________________________________________________________
11
released. The manual reset detect function is internally
debounced for the t
DEB
timeout period, so the output
can be connected directly to a momentary pushbutton
switch, if desired (Figure 2).
Manual Reset Input
Many microprocessor-based products require manual
reset capability, allowing the operator, a test techni-
cian, or external logic circuitry to initiate a reset while
the monitored supplies remain above their reset thresh-
olds. The MAX6736
–
MAX6739 have a dedicated
active-low
MR
input. The
RESET
is asserted low while
MR
is held low and remains asserted for the manual
reset timeout period after
MR
returns high. The
MR
input has an internal 1.5k
pullup resistor to V
CC
1 and
can be left unconnected if not used.
MR
can be driven
with CMOS logic levels, open-drain/open-collector out-
puts, or a momentary pushbutton switch to GND to cre-
ate a manual reset function.
Adjustable Input Voltage
The MAX6738/MAX6739 and MAX6740/MAX6743 pro-
vide an additional input to monitor a second or third
system voltage. The threshold voltage at RSTIN is typi-
cally 488mV. Connect a resistor-divider network to the
circuit as shown in Figure 3 to establish an externally
controlled threshold voltage, V
EXT_TH
.
V
EXT_TH
= 0.488V((R1 + R2) / R2)
Low leakage current at RSTIN allows the use of large-
valued resistors, resulting in reduced power consump-
tion of the system.
Power-Fail Comparator
PFI is the noninverting input to an auxiliary comparator. A
488mV internal reference (V
TH
-
PFI
) is connected to the
inverting input of the comparator. If PFI is less than
488mV,
PFO
is asserted low.
PFO
deasserts without a
timeout period when PFI rises above the externally set
threshold. Common uses for the power-fail comparator
include monitoring for low battery conditions or a failing
DC-DC converter input voltage (see the
Typical
Application Circuits
). The asserted
PFO
output can place
a system in a low-power suspend mode or support an
orderly system shutdown before monitored V
CC
voltages
drop below the reset thresholds. Connect PFI to an exter-
nal resistor-divider network as shown in Figure 4 to set
the desired trip threshold. Connect PFI to V
CC
1 if unused.
Applications Information
Interfacing to the μP with
Bidirectional Reset Pins
Most microprocessors with bidirectional reset pins can
interface directly to open-drain
RESET
output options.
Systems simultaneously requiring a push-pull RESET
output and a bidirectional reset interface can be in
logic contention. To prevent contention, connect a
4.7k
resistor between
RESET
and the μP
’
s reset I/O
port as shown in Figure 5.
Figure 2. MAX6740/MAX6741/MAX6742 Manual Reset Timing Diagram
OPEN
CLOSED
t
DEB
GND
t
MRP
t
MRP
t
DEB
V
CC
1
RESET
PUSHBUTTON
SWITCH
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
MAX6738
MAX6739
MAX6740
MAX6743
RSTIN
GND
V
EXT_TH
R1
R2
Figure 3. Monitoring an Additional Voltage
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| MAX6738XKTD7 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER DUAL-/TRIPLE-VOLTAGE SC70 - Rail/Tube |
| MAX6738XKTD7+T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6738XKTD7-T | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 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 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6738XKVD3 | 制造商:Maxim Integrated Products 功能描述:LOW-POWER DUAL-/TRIPLE-VOLTAGE SC70 MICROPROC - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX6738XKVD3+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX6738XKVD3+ PROCESSOR SUPERVISORS - Boxed Product (Development Kits) 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:Maxim MAX6738XKVD3+ Processor Supervisors |
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