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參數(shù)資料
| 型號： | MAX822TUS-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 電源管理 |
| 英文描述： | 4-Pin レP Voltage Monitors with Pin-Selectable Power-On Reset Timeout Delay |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO4 |
| 封裝： | TO-253, SOT-143, 4 PIN |
| 文件頁數(shù)： | 6/8頁 |
| 文件大?。?/td> | 77K |
| 代理商： | MAX822TUS-T |
M
Ensuring a V alid
RESET
Output
Down to V
CC
= 0V
When V
CC
falls below 1V, the MAX821
RESET
output
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS logic inputs con-
nected to the
RESET
output can drift to undetermined
voltages. This presents no problem in most applica-
tions, since most
μ
P and other circuitry is inoperative
with V
CC
below 1V. However, in applications where the
RESET
output must be valid down to 0V, adding a pull-
down resistor to the
RESET
pin will cause any stray
leakage currents to flow to ground, holding
RESET
low
(Figure 2a). 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 MAX822 if RESET is required to remain valid for
V
CC
< 1V (Figure 2b).
Interfac ing to μPs with
Bidirec tional Reset Pins
μPs with bidirectional reset pins (such as the Motorola
68HC11 series) can contend with the MAX821 reset
output. For example, if the MAX821
RESET
output is
asserted high and the μP wants to pull it low, indetermi-
nate logic levels may result. To correct such cases,
connect a 4.7k
resistor between the MAX821
RESET
output and the μP reset I/O (Figure 3). Buffer the reset
output to other system components.
___________________Chip Information
TRANSISTOR COUNT: 492
4-Pin μP Voltage Monitors with Pin-S elec table
Power-On Reset T imeout Delay
6
_______________________________________________________________________________________
4.7k
V
CC
GND
RESET
MAX821
RESET
V
CC
GND
μ
P
BUFFER
BUFFERED RESET
TOOTHER SYSTEM
COMPONENTS
Figure 3. Interfacing to μPs with Bidirectional Reset I/O
R1
V
CC
V
CC
GND
MAX821
RESET
R1
V
CC
V
CC
GND
MAX822
RESET
a)
b)
Figure 2.
RESET/
RESET Valid to V
CC
= Ground Circuit
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