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參數(shù)資料
| 型號(hào)： | ASM1834DS |
| 廠商： | ALLIANCE SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | COIL 2.7UH 1800MA CHOKE SMD |
| 中文描述： | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | SO-8 |
| 文件頁(yè)數(shù)： | 4/10頁(yè) |
| 文件大小： | 256K |
| 代理商： | ASM1834DS |
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Notice: The information in this document is subject to change without notice
Dual 5V and 3.3V μP Power Supply Supervisor with Manual Reset
ASM1834/A/D
rev 1.3
April 2005
Manual Reset Operation
Push-button switch input, PBRST, allows the user to override
the internal trip point detection circuits and issue reset
signals. The pushbutton input is debounced and is pulled
HIGH through an internal 40k
resistor.
When at least one of the reset outputs is not asserted, a push
button initiated reset signal can be issued by holding PBRST
LOW for at least 2ms. When PBRST is held LOW, both resets
become active and remain active for approximately 350ms
after PBRST returns HIGH. (See figures 3 and 4).
Reset Output Signal
Reset output signals are valid as long as either voltage at
5V
IN
or 3.3V
IN
is above 1.2V. In addition, the ASM1834 has
push-pull outputs that can remain valid below a 1.2V input
level. To sink current below 1.2V, a resistor should be
connected from the RESET output to ground. This resistor
guarantees a valid reset signal down to 0V. A 100k
value is
suggested.
The AS1834A open drain reset outputs require pull-up
resistors and must be low enough in value to pull the output
into a HIGH state. Resistor value is not critical in most
applications and a value of 10k
is suggested. (See Figures
5 and 6).
The ASM1834A open drain reset outputs can be connected
to the same potential through a single pull-up resistor. In this
configuration a failure on either supply will generate an active
LOW reset. If the inputs are pulled-up to different voltages,
the reset outputs (pin 2 and pin 7) cannot be connected to
form a wired “AND” (see figure 7).
~
~
V
OH
V
OL
RESET
RESET
PBRST
t
PB
t
PDLY
V
IL
V
IH
t
RST
Figure 4: Timing Diagram: Pushbutton Reset
1
2
3
4
5
6
7
8
3.3V
5V
3.3V
IN
3.3V RESET
5VTOL
GND
PBRST
5V
IN
5V RESET
3.3VTOL
ASM1834
Figure 3: Pushbutton Reset
RESET
μP
Input
100k
Figure 5: ASM1834 RESET Valid to 0V
1
2
3
4
5
6
7
8
3.3V
5V
3.3V
IN
3.3V RESET
5VTOL
GND
PBRST
5V
IN
5V RESET
3.3VTOL
ASM1834
Figure 6: ASM1834A Open Drain Output Pull-Up Resistor
10k
10k
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| ASM1834DSF | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
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| ASM1834DU | 制造商:ALSC 制造商全稱:Alliance Semiconductor Corporation 功能描述:Dual 5V and 3.3V uP Power Supply Supervisor with Manual Reset |
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