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參數(shù)資料
| 型號： | AS1926-BSTT-D07 |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Low Voltage, Manual Reset; Package Type: SOT23-5; Reset Type: Open-Drain Active Low; Timeout Period: 140,00; Supervised Voltages (IN1): 0,81 |
| 封裝： | SOT23-5 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大小： | 339K |
| 代理商： | AS1926-BSTT-D07 |
www.austriamicrosystems.com
Revision 1.00
8 - 12
AS1925/AS1926
Data Sheet - Application Information
9 Application Information
Figure 9. Typical Application Diagram
Fast Transient Immunity
The AS1925/AS1926 are virtually immune to fast, falling V
CC
transients.
Figure 8 on page 6
shows typical transient
duration versus reset comparator overdrive, for which the devices do not generate a reset pulse. The graph was gen-
erated using a falling pulse applied to V
CC
, starting 0.1V above the actual reset threshold and ending below it by the
magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width that a falling V
CC
transient can have without causing a reset pulse. As the magnitude of the transient goes further below the reset
threshold, the maximum allowable pulse width decreases.
Note:
For additional transient immunity, place a 0.1μF bypass capacitor as close as is practical to pin V
CC
.
Ensuring a Valid Reset Output Down to 0V
If V
CC
falls below 0.55V, the AS1925 push/pull RESETN output will no longer sink current and becomes an open cir-
cuit, which means that high-impedance CMOS-logic inputs connected to RESETN can drift to undetermined voltages.
This is not relevant for most applications since most microprocessors and other circuits do not operate with a supply
voltage < 0.55V.
In systems where RESETN must be valid down to 0V, adding a pulldown resistor to RESETN
(see Figure 10)
causes
any stray leakage currents to flow to ground, holding RESETN low. The value of the pulldown resistor is not critical; a
200k
Ω
resistor is large enough not to load RESETN and small enough to pull RESETN to ground.
Figure 10. Reset Valid to V
CC
= 0V
Note:
A 200k
Ω
pullup resistor to V
CC
is also recommended if the push/pull RESET is required to remain valid for V
CC
0.75V.
AS1926
External
Reset
CPU
RESETN
V
CC
I/O
Supply
0.9V
GND
DC/DC
Converter
+3.3V
GND 2
5
V
CC
1
RESETN
4
MRN
AS1925
R
PULLDOWN
GND 2
5
V
CC
1
RESETN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AS1972 | Dual Comparator, Push-Pull; Package Type: MSOP-8 |
| AS1974 | Quad Comparator, Push-Pull; Package Type: TSSOP-14 |
| AS1975 | Quad Comparator, Open-Drain; Package Type: TSSOP-14 |
| AS1970-T | Single Comparator, Push-Pull; Package Type: SOT23-5 |
| AS1973-T | Dual Comparator. Open-Drain; Package Type: MSOP-8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AS1926D07-T | 制造商:ams 功能描述:IC SUPERVISOR MAN RESET SOT23-5 |
| AS1927L-BTDT | 制造商:ams 功能描述:Supervisory Circuits |
| AS1927L-BTDT33S | 制造商:ams 功能描述:IC SUPERVISOR ACT LOW 6TDFN 制造商:ams 功能描述:T&R / TDFN 2x2 6 |
| AS1927L-BTDT-33s-1k | 功能描述:監(jiān)控電路 RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復(fù)位:Resettable 監(jiān)視器:No Watchdog 電池備用開關(guān):No Backup 上電復(fù)位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| AS1927LBTDT33S-1K | 制造商:ams 功能描述:TDFN 2x2 6 |
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