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參數(shù)資料
| 型號： | MAX809R |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 復(fù)位半導(dǎo)體 |
| 英文描述： | 3-Pin Microprocessor Reset Circuits |
| 中文描述： | 3引腳微處理器復(fù)位電路 |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 136K |
| 代理商： | MAX809R |
M
ground, holding
RESET
low (Figure 2). R1’s value is not
critical; 100k
is large enough not to load
RESET
and
small enough to pull
RESET
to ground.
A 100k
pull-up resistor to V
CC
is also recommended
for the MAX810 if RESET is required to remain valid for
V
CC
< 1V.
Interfacing to μPs with
Bidirectional Reset Pins
Since the
RESET
output on the MAX803 is open drain,
this device interfaces easily with μPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the μP supervisor’s
RESET
output directly
to the microcontroller’s (μC’s)
RESET
pin with a single
pull-up resistor allows either device to assert reset
(Figure 3).
MAX803 Open-Drain
RESET
Output
Allows Use with Multiple Supplies
Generally, the pull-up connected to the MAX803 will
connect to the supply voltage that is being monitored at
the IC’s V
CC
pin. However, some systems may use the
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
(Figure 4). Note that as the MAX803’s V
CC
decreases
below 1V, so does the IC’s ability to sink current at
RESET
. Also, with any pull-up,
RESET
will be pulled
high as V
CC
decays toward 0. The voltage where this
occurs depends on the pull-up resistor value and the
voltage to which it is connected.
Benefits of Highly Accurate
Reset Threshold
Most μP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup-
ply voltages. This ensures a reset will
not
occur within
5% of the nominal supply, but
will
occur when the sup-
ply is 10% below nominal.
When using ICs rated at only the nominal supply ±5%,
this leaves a zone of uncertainty where the supply is
between 5% and 10% low, and where the reset may or
may not be asserted.
The MAX8__L/T/Z use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below
nominal.
3-Pin Microprocessor Reset Circuits
6
_______________________________________________________________________________________
RESET
GND
RESET
INPUT
R
PULLUP
MAX803
5V SYSTEM
GND
V
CC
+3.3V
+5.0V
V
CC
Figure 4. MAX803 Open-Drain
RESET
Output Allows Use with
Multiple Supplies
RESET
GND
RESET
INPUT
MAX803
MOTOROLA
68HCXX
μ
P
GND
V
CC
V
CC
V
CC
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
TRANSISTOR COUNT: 275 (SOT23)
380 (SC70)
___________________Chip Information
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX803L | 3-Pin Microprocessor Reset Circuits |
| MAX810T | 3-Pin Microprocessor Reset Circuits |
| MAX810Z | 3-Pin Microprocessor Reset Circuits |
| MAX810SEURT | IC-SM-SUPERVISORY CCT |
| MAX810L | 3-Pin Microprocessor Reset Circuits |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX809RCPA | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage Detector |
| MAX809RCUR | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Voltage Detector |
| MAX809RD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:3-pin microprocessor resets |
| MAX809RD,115 | 制造商:NXP Semiconductors 功能描述: |
| MAX809REUR | 制造商:Maxim Integrated Products 功能描述:3-PIN MICROPROCESSOR RESET CIRCUITS - Rail/Tube |
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