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參數(shù)資料
| 型號(hào)： | AS1920-18-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類(lèi)： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 3x-Input Supervisory Push/Pull |
| 文件頁(yè)數(shù)： | 8/14頁(yè) |
| 文件大小： | 278K |
| 代理商： | AS1920-18-T |
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Revision 1.00
8 - 14
AS1920/AS1922
Datasheet - Application Information
9 Application Information
Supply Monitoring
The AS1920/AS1922 are low-power, high-accuracy triple-supply monitoring circuits with a single 200ms microproces-
sor reset output.
All V
CC
inputs (V
CC18
, V
CC3
, and V
CCA
) must be above their thresholds to prevent a reset from being asserted. The
AS1920/AS1922 will assert a reset during powerup, powerdown and brownout conditions on one or all of the V
CC
inputs.
Power Detect
The AS1920/AS1922 is powered from the 3V input pin (V
CC3
). The power detect circuitry ensures that the device pulls
pin RESETN low as soon as the primary input pin is
≥
1V or the secondary input pin is
≥
1V.
Powerup
The power detect circuitry ensures that RESETN will be low when either V
CC18
or V
CC3
≥
1V. As long as any one of the
V
CC
inputs is below its reset threshold, RESETN will stay at a logic low. When all V
CC
inputs have stabilized, an inter-
nal timer will be started and RESETN will be driven high after 200ms.
Powerdown
On powerdown, if any of the V
CC
inputs drop below its threshold, RESETN is held at a logic low (0.3V) and is guaran-
teed until V
CC3
and V
CC18
< 1V.
Override Functions
As the trip points for V
CC3
and V
CC18
will always be greater than the trip point for V
CCA
, if pin V
CCA
is not used, it
should be tied to V
CC3
or V
CC18
. In a similar manner if pin V
CC18
is not used it should be tied to V
CC3
. Tying V
CC3
to
V
CC18
and operating from a 1.8V supply will assure the continuous assertion of RESETN.
Note:
Pin V
CC3
must be used in all configurations.
Ensuring RESETN Valid for Supply Voltages < 1V
When the supplies drops below 1V the RESETN output current sink capability is greatly reduced. Stray currents and
stray capacitance to signals other than GND can cause the RESETN output to float. This is not relevant for most appli-
cations since most microprocessors and other circuits do not operate with a supply voltage < 1V.
In applications where the RESETN output must be valid down to 0V, a pulldown resistor from pin RESETN to ground
will ensure RESETN is held low
(see Figure 12)
.
Figure 12. Typical Application w/Resistor on RESETN Output to GND
The value of the pulldown resistor (R
3
) is a trade-off between pulldown strength and loading of the RESETN pin. If the
value of R
3
is too large RESETN may still float, and if the value of R
3
is too small it may load RESETN and also use
excess supply current, therefore a value of 100k
Ω
is recommended for the pulldown resistor.
R
3
100k
Ω
R
2
R
1
3V
1.8V
Adjustable
Supply
1
RESETN
3
V
CCA
2
GND
4
V
CC18
5
V
CC3
AS1920/
AS1922
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS1923A-BSTT-A | Quad-Input Supervisory Circuit; Package Type: SOT23-6; Reset Type: Open-Drain; Supervised Voltages (IN1): 5,00; Supervised Voltages (IN2): 3,30; Supervised Voltages (IN3): 2,50; Supervised Voltages (IN4): 1,2 - 5,5V |
| AS1923A-BSTT-C | Quad-Input Supervisory Circuit; Package Type: SOT23-6; Reset Type: Open-Drain; Supervised Voltages (IN1): 5,00; Supervised Voltages (IN2): 3,30; Supervised Voltages (IN3): 1,80; Supervised Voltages (IN4): ADJ. |
| AS1923A-BSTT-I | Quad-Input Supervisory Circuit; Package Type: SOT23-6; Reset Type: Open-Drain; Supervised Voltages (IN1): 5,00; Supervised Voltages (IN2): 3,30; Supervised Voltages (IN3): 2,50; Supervised Voltages (IN4): 1,80 V |
| AS1923A-BSTT-K | Quad-Input Supervisory Circuit; Package Type: SOT23-6; Reset Type: Open-Drain; Supervised Voltages (IN1): 1,20-5,50; Supervised Voltages (IN2): 3,30; Supervised Voltages (IN3): 2,50; Supervised Voltages (IN4): 1,2 - 5,5V |
| AS1923A-BSTT-O | Quad-Input Supervisory Circuit; Package Type: SOT23-6; Reset Type: Open-Drain; Supervised Voltages (IN1): 5,00; Supervised Voltages (IN2): 3,30; Supervised Voltages (IN3): 1,23-5,50; Supervised Voltages (IN4): -5 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS1922 | 制造商:AMSCO 制造商全稱(chēng):austriamicrosystems AG 功能描述:Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits |
| AS1922-18 | 制造商:AMSCO 制造商全稱(chēng):austriamicrosystems AG 功能描述:Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits |
| AS1922-18-T | 功能描述:IC SUPERVISOR OPEN-DRAIN SOT23-5 RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類(lèi)型:簡(jiǎn)單復(fù)位/加電復(fù)位 監(jiān)視電壓數(shù)目:1 輸出:開(kāi)路漏極或開(kāi)路集電極 復(fù)位:高有效 復(fù)位超時(shí):- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應(yīng)商設(shè)備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱(chēng):NCP301HSN18T1GOSCT |
| AS1923 | 制造商:AMSCO 制造商全稱(chēng):austriamicrosystems AG 功能描述:Quad-Voltage Microprocessor Supervisory Circuit |
| AS1923_04 | 制造商:AMSCO 制造商全稱(chēng):austriamicrosystems AG 功能描述:Quad-Voltage Microprocessor Supervisory Circuit |
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