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參數資料
| 型號： | ADM709SAN |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 電源管理 |
| 英文描述： | Power Supply Monitor with Reset |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數： | 3/4頁 |
| 文件大小： | 224K |
| 代理商： | ADM709SAN |
ADM709
REV. 0
–3–
RESET
at Voltages < 1 V
The ADM709
RESET
output is guaranteed to operate with
supply voltages as low as 1 V. If it is desired that the
RESET
output remains low below 1 V, then a pull-down resistor should
be connected between the
RESET
output and GND. A resistor
of 100 k
is suitable. This is illustrated in Figure 5.
R1
RESET
ADM709
GND
Figure 5.
RESET
Valid @ V
CC
< 1 V
Glitch Immunity
The ADM709 is immune to short transients which may occur
on the V
CC
line. This is important so that spurious resets are not
generated as a result of minor glitches on the power supply.
Additional glitch immunity may be obtained by connecting a
capacitor (0.1
μ
F or greater) as close as possible to the V
CC
pin
on the device.
Microprocessors with Bidirectional I-O
Some microprocessors or microcontrollers such as the
MC68HC11 have bidirectional reset lines. In order to avoid
signal contention, a resistor of 4.7 k
should be connected
between the ADM709
RESET
output and the microcontroller
RESET
line. This arrangement is shown in Figure 6.
RESET
ADM709
GND
GND
μP
BUFFERED
RESET
+5V
RESET
V
CC
Figure 6. Interfacing to Microprocessors with
Bidirectional
RESET
V
CC
RESET
ADM709
V
TH
RESET
GENERATOR
GND
Figure 1. Functional Block Diagram
RESET
ADM709
GND
GND
μP
RESET
V
CC
V
CC
Figure 2. Typical Operating Circuit
CIRCUIT INFORMATION
RESET
Output
RESET
is an active low output which provides a reset signal to
the microprocessor whenever the V
CC
supply voltage is below
the reset threshold. An internal timer holds
RESET
low for
140 ms after the voltage on V
CC
rises above the threshold. This
is intended as a power-on reset signal for the processor. It allows
time for the power supply and microprocessor to stabilize after
power up. Similarly a power supply brownout will initiate a pro-
cessor reset. On power-down, the
RESET
output remains low
with V
CC
as low as 1 V. This ensures that the microprocessor is
held in a stable shutdown condition as the power supply drops.
VRT
VRT
t
RS
V
CC
RESET
Figure 3. Power Off/On
RESET
Timing
V
CC
RESET
400ms/DIV
Figure 4.
RESET
Output vs. V
CC
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