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參數(shù)資料
| 型號： | MAX6723 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Replaced by TPL9201 : Microcontroller Power Supply and Low-Side Driver 20-PDIP -40 to 125 |
| 中文描述： | 雙/三路、超低電壓、SOT23封裝、微處理器監(jiān)控電路 |
| 文件頁數(shù)： | 11/19頁 |
| 文件大?。?/td> | 418K |
| 代理商： | MAX6723 |
providing an early power-fail warning so software can
conduct an orderly system shutdown. It can also be
used to monitor supplies other than V
CC
1 or V
CC
2 by
setting the power-fail threshold with a resistor-divider, as
shown in Figure 3. PFI is the input to the power-fail com-
parator. The typical comparator delay is 2μs from PFI to
PFO
. Connect PFI to ground of V
CC
1 if unused.
Ensuring a Valid Reset Output
Down to V
CC
= 0
The MAX6715
–
MAX6729 are guaranteed to operate
properly down to V
CC
= 0.8V. In applications that
require valid reset levels down to V
CC
= 0 use a pull-
down resistor at
RST
to ground. The resistor value used
is not critical, but it must be large enough not to load
the reset output when V
CC
is above the reset threshold.
For most applications, 100k
is adequate. This config-
uration does not work for the open-drain outputs of the
MAX6715/MAX6717/MAX6719/MAX6721/MAX6723/
MAX6725/MAX6727/MAX6728. For push-pull, active-
high RST output connect the external resistor as a
pullup from RST to V
CC
1.
Applications Information
Interfacing to μPs with Bidirectional
Reset Pins
Most microprocessors with bidirectional reset pins can
interface directly to open-drain
RST
output options.
Systems simultaneously requiring a push-pull
RST
out-
put and a bidirectional reset interface can be in logic
contention. To prevent contention, connect a 4.7k
resistor between
RST
and the μP
’
s reset I/O port as
shown in Figure 4.
Adding Hysteresis to the Power-Fail
Comparator
The power-fail comparator has a typical input hysteresis
of 3mV. This is sufficient for most applications where a
power-supply line is being monitored through an external
voltage-divider (see the
Power-Fail Comparator
section).
If additional noise margin is desired, connect a resistor
between
PFO
and PFI as shown in Figure 5. Select the
values of R1, R2, and R3 so PFI sees V
PFI
(626mV) when
V
EXT
falls to its power-fail trip point (V
FAIL
) and when VIN
rises to its power-good trip point (V
GOOD
). The hysteresis
window extends between the specified V
FAIL
and V
GOOD
thresholds. R3 adds the additional hysteresis by sinking
current from the R1/R2 divider network when
PFO
is logic
low and sourcing current into the network when
PFO
is
logic high. R3 is typically an order of magnitude greater
than R1 or R2.
The current through R2 should be at least 2.5μA to
ensure that the 25nA (max) PFI input current does not
significantly shift the trip points. Therefore, R2 <
V
PFI
/2.5μA < 248k
for most applications. R3 will provide
additional hysteresis for
PFO
push-pull (V
OH
= V
CC
1) or
open-drain (V
OH
= V
PULLUP
) applications.
M
Dual/Triple Ultra-Low-Voltage SOT23 μP
Supervisory Circuits
______________________________________________________________________________________
11
MAX6728/
MAX6729
R1
R2
PFI
GND
V
IN
PFO
V
TRIP
= V
PFI
R1 + R2
R2
(
)
MAX6728/
MAX6729
R1
R2
PFI
GND
V
CC
V
IN
PFO
V
TRIP
= R2
(V
PFI
)
[
1
R1
1
R2
+
-V
CC
R1
]
(
)
V
PFI
= 626.5mV
A
B
Figure 3. Using Power-Fail Input to Monitor an Additional
Power-Supply a) V
IN
is Positive b) V
IN
is Negative
MAX6715
–
MAX6729
GND
GND
V
CC
1 V
CC
2
V
CC
2
V
CC
1
RST
RESET TO OTHER SYSTEM COMPONENTS
RESET
μ
P
4.7k
Figure 4. Interfacing to μPs with Bidirectional Reset I/O
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6724 | Replaced by TPL9201 : Microcontroller Power Supply and Low-Side Driver 20-PDIP -40 to 125 |
| MAX6725 | Replaced by TPL9201 : Microcontroller Power Supply and Low-Side Driver 20-HTSSOP -40 to 125 |
| MAX6726 | Replaced by TPL9201 : Microcontroller Power Supply and Low-Side Driver 20-HTSSOP -40 to 125 |
| MAX6727 | Replaced by TPL9202 : Microcontroller Power Supply and Low-Side Driver 20-HTSSOP -40 to 125 |
| MAX6728 | Replaced by TPL9202 : Microcontroller Power Supply and Low-Side Driver 20-HTSSOP -40 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6723AUTLTD1+T | 功能描述:監(jiān)控電路 Triple uPower Supervisor 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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6723AUTLTD2+T | 功能描述:監(jiān)控電路 Triple uPower Supervisor 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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6723AUTLTD3+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.625V/3.075V/ADJV 15UA 6PIN SOT-23 - Rail/Tube |
| MAX6723AUTLTD3+T | 功能描述:監(jiān)控電路 Triple uPower Supervisor 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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX6723AUTLTD4+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(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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