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參數(shù)資料
| 型號： | MAX6468XS26D3 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset |
| 中文描述： | 微處理器監(jiān)控復(fù)位電路，帶有邊沿觸發(fā)，單發(fā)手動復(fù)位 |
| 文件頁數(shù)： | 5/9頁 |
| 文件大?。?/td> | 224K |
| 代理商： | MAX6468XS26D3 |
Detailed Description
Reset Output
The MAX6467 provides an active-low open-drain
RESET
output. The MAX6468 provides an active-low
push-pull
RESET
output.
RESET
asserts low if V
CC
drops below the selected threshold or if a falling edge
occurs on
MR
.
RESET
remains low for the V
CC
reset
timeout period after V
CC
increases above the threshold
voltage or is one-shot pulsed low for the
MR
timeout
period after a falling edge on
MR
.
Manual Reset Input
Many μP-based products require manual reset capability,
allowing the operator, a test technician, or external logic
circuitry to initiate a reset. A falling edge on
MR
asserts
RESET
low.
RESET
is one-shot pulsed low for the
MR
timeout period after a falling edge on
MR
. An internal
1.5k
pullup resistor to V
CC
allows MR to be left uncon-
nected if not used.
MR
can be driven with TTL or CMOS-
logic levels, or with open-drain/collector outputs. Connect
a normally open momentary pushbutton switch from
MR
to GND to realize a manual reset function. External
debounce circuitry is not required, as the MAX6467/
MAX6468 respond to the first falling edge on
MR
and
ignore subsequent falling edges within the reset timeout
period and during the
MR
debounce period (see Figure
1). After
MR
goes high for 150ms (t
DEB
), the manual reset
one-shot is ready to trigger a reset on the next
MR
falling
edge. Connect a 0.1μF capacitor from
MR
to GND when
using long cables to provide additional noise immunity
(Figure 2).
M
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
_______________________________________________________________________________________
5
Pin Description
PIN
1
NAME
GND
FUNCTION
Ground
Reset Output.
RESET
is an active-low open-drain (MAX6467) or push-pull (MAX6468) output.
RESET
asserts
low when V
CC
drops below the selected threshold and remains low for the V
CC
reset timeout period after
V
CC
rises above the threshold. The
RESET
one-shot asserts low for a fixed
MR
reset timeout period on the
falling edge of the manual reset input. The open-drain output requires an external pullup resistor.
Manual Reset Input. Drive
MR
low to initiate a reset output.
MR
controls an edge-triggered one-shot that
asserts
RESET
low for a fixed
MR
timeout period when
MR
is driven low. Internal timing circuitry ignores
switch close and open bounce to ensure proper one-shot reset timing.
2
RESET
3
MR
4
V
CC
Power-Supply Input. V
CC
provides power to the device and is also a monitored voltage. When V
CC
drops
below the selected threshold,
RESET
asserts low and remains low for the reset timeout period after V
CC
rises
above the threshold. For better noise immunity, bypass V
CC
to GND with a 0.1μF capacitor.
V
CC
GND
GND
MR
t
RP
GND
RESET
V
TH
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
t
MRP
t
MRP
t
DEB
Figure 1. Timing Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6468XS26D3+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.625V 7UA 4PIN SC-70 - Rail/Tube |
| MAX6468XS26D3+T | 功能描述:監(jiān)控電路 MPU Supervisory Reset Circuit 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 |
| MAX6468XS26D3-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 |
| MAX6468XS26D7 | 制造商:Maxim Integrated Products 功能描述:MICROPROCESSOR SUPERVISORY RESET CI - Rail/Tube |
| MAX6468XS26D7+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.625V 7UA 4PIN SC-70 - Rail/Tube |
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