- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384693 > MAX6821LUK-T (MAXIM INTEGRATED PRODUCTS INC) 8-Bit Shift Registers With Output Latches 16-CFP -55 to 125 PDF資料下載
參數(shù)資料
| 型號： | MAX6821LUK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-Bit Shift Registers With Output Latches 16-CFP -55 to 125 |
| 中文描述： | 1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 5/9頁 |
| 文件大小： | 167K |
| 代理商： | MAX6821LUK-T |
M
Low-Voltage SOT23 μP Supervisors with
Manual Reset and Watchdog Timer
_______________________________________________________________________________________
5
Pin Description
PIN NUMBERS
MAX6821
MAX6822
MAX6823
MAX6824
MAX6825
PIN
NAME
FUNCTION
1
1
1
1
RESET
Active-Low Open-Drain or Push-Pull Reset Output.
RESET
changes from high to low when the V
CC
input drops below the
selected reset threshold,
MR
is pulled low, or the watchdog
triggers a reset.
RESET
remains low for the reset timeout period
after V
CC
exceeds the device reset threshold,
MR
goes low to
high, or the watchdog triggers a reset.
Active-High Push-Pull Reset Output. RESET changes from low to
high when the V
CC
input drops below the selected reset threshold,
MR
is pulled low, or the watchdog triggers a reset. RESET remains
high for the reset timeout period after V
CC
exceeds the device
reset threshold,
MR
goes low to high, or the watchdog triggers a
reset.
Ground
Active-Low Manual Reset Input. Internal 50k
pullup to V
CC
. Pull
low to force a reset. Reset remains active as long as
MR
is low
and for the reset timeout period after
MR
goes high. Leave
unconnected or connect to V
CC
if unused.
Watchdog Input. If WDI remains high or low for longer than the
watchdog timeout period, the internal watchdog timer runs out and
a reset is triggered for the reset timeout period. The internal
watchdog timer clears whenever reset is asserted, the manual
reset is asserted, or WDI sees a rising or falling edge. If WDI is
left unconnected or is connected to a three-stated buffer output,
the watchdog feature is disabled.
Supply Voltage and Input for Reset Threshold Monitor
1
3
3
RESET
2
2
2
2
2
GND
3
3
3
4
MR
4
4
4
4
WDI
5
5
5
5
5
V
CC
Detailed Description
RESET
/RESET Output
A μP
’
s reset input starts the μP in a known state. The
MAX6821
–
MAX6825 μP supervisory circuits assert a
reset to prevent code-execution errors during power-
up, power-down, and brownout conditions. Whenever
V
CC
falls below the reset threshold, the reset output
asserts low for
RESET
and high for RESET. Once V
CC
exceeds the reset threshold, an internal timer keeps the
reset output asserted for the specified reset timeout
period (t
RP
); after this interval, reset output returns to its
original state (see Figure 2).
Manual Reset Input
Many μP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. On the MAX6821/
MAX6822/MAX6823/MAX6825, a logic low on
MR
asserts a reset. Reset remains asserted while
MR
is
low, and for the timeout period (140ms min) after it
returns high.
MR
has an internal 50k
pullup resistor,
so it can be left open if not used. This input can be dri-
ven with CMOS logic levels or with open-drain/collector
outputs. Connect a normally open momentary switch
from
MR
to GND to create a manual reset function;
external debounce circuitry is not required. If
MR
is dri-
ven from long cables or the device is used in a noisy
environment, connect a 0.1μF capacitor from
MR
to
GND to provide additional noise immunity.
Watchdog Input
In the MAX6821
–
MAX6824, the watchdog circuit moni-
tors the μP
’
s activity. If the μP does not toggle (low to
high or high to low) the watchdog input (WDI) within the
watchdog timeout period (1.6s nominal), reset asserts
for the reset timoeout period. The internal 1.6s timer
can be cleared by either a reset pulse or by toggling
WDI. The WDI can detect pulses as short as 50ns.
While reset is asserted, the timer remains cleared and
does not count. As soon as reset is released, the timer
starts counting (see Figure 3).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX6821MUK-T | Low-Voltage SOT23 レP Supervisors with Manual Reset and Watchdog Timer |
| MAX6821RUK-T | Low-Voltage SOT23 レP Supervisors with Manual Reset and Watchdog Timer |
| MAX6821SUK-T | Low-Voltage SOT23 レP Supervisors with Manual Reset and Watchdog Timer |
| MAX6821TUK-T | 8-Bit Shift Registers With Input Latches 16-CDIP -55 to 125 |
| MAX6821VUK-T | 8-Bit Shift Registers With Input Latches 20-LCCC -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6821MUK | 制造商:Maxim Integrated Products 功能描述:LOW_VOLTAGE SOT23 MICROPROCESSOR SU - Cut Tape Product |
| MAX6821MUK+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX6821MUK+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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（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 |
| MAX6821MUK-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 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復位延遲（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 |
| MAX6821RUK | 制造商:Maxim Integrated Products 功能描述:LOW_VOLTAGE SOT23 MICROPROCESSOR SU - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。