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參數(shù)資料
| 型號： | AS1907C20-T |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Low-Volt. Active-Low Push/Pull; Package Type: SOT23-3; Reset Type: Push/Pull Active-Low; Timeout Period: 100,00; Supervised Voltages (IN1): 2,00 |
| 中文描述： | 低電壓微處理器復位電路 |
| 封裝： | SOT23-3 |
| 文件頁數(shù)： | 7/10頁 |
| 文件大小： | 116K |
| 代理商： | AS1907C20-T |
AS1907/AS1908/AS1909
Datasheet - Application Information
wwwams.com/Supervisors/AS1907-09
Revision 1.8
7 - 10
8 Application Information
8.1 Negative Going V
CC
Transients
All devices are effectively immune to short-duration, negative-going V
CC
transients (glitches). The MaximumTransient Duration vs. Reset
Comparator Overdrive graph
(see page 5)
shows the maximumpulse width that a negative-going V
CC
transient may typically have without
issuing a reset signal. As the amplitude of the transient increases, the maximumallowable pulse width decreases.
8.2 Valid Reset Output
If V
CC
falls below 1V and approaches the mnimumoperating voltage of 0.7V, push/pull-type reset sinking/sourcing capabilities greatly decrease.
High-impedance CMOS-logic inputs connected to RESET can drift to indetermnate voltages, although this is normally not a problemsince most
mcroprocessors do not operate at V
CC
< 1V.
For the AS1908, where RESET must be valid to V
CC
= 0, a 100k
Ω
pull-up resistor between RESET and V
CC
(see Figure 1 on page 1)
will hold
RESET high if V
CC
falls below 0.7V.
For the AS1907, where RESET must be valid down to 0V, add a pull-down resistor between RESET and GND
(see Figure 1 on page 1)
to
elimnate stray leakage currents and hold RESET low A pull-down resistor of 100k
Ω
is large enough not to load RESET yet small enough to pull
it low
Since the AS1909 has an open-drain, active-low output, it typically uses a pull-up resistor. With this device, RESET will most likely not maintain
an active condition, but will drift to a non-active level due to the pull-up resistor and the reduced sinking capability of the open drain device.
Therefore, this device is not recommended for applications where the RESET pin is required to be valid down to V
CC
= 0.
8.3 Bi-Directional Mcroprocessor Interface
The RESET output on the AS1909 is open-drain, thus this device can interface easily with mcroprocessors that have bi-directional reset pins,
such as the Motorola 68HC11.
Connect the RESET output of this device directly to the mcroprocessor’s RESET I/O pin with a single pull-up resistor to allow either device to
assert reset
(see Figure 1 on page 1)
.
8.4 Layout Considerations
The devices require proper layout and design procedures for optimumperformance.
Short, wide traces should be used to reduce stray inductance and capacitance.
Bypass capacitors should be as close to the device as possible.
Large ground planes should be used wherever possible.
Table 5. Reset Thresholds
Reset Thresholds
T
AMB
= +25oC
T
AMB
= -40 to +125oC
Suffix
25
24
23
22
21
20
19
18
17
16
Mn
2.478
2.378
2.279
2.180
2.081
1.982
1.883
1.784
1.685
1.586
Typ
2.50
2.40
2.30
2.20
2.10
2.00
1.90
1.80
1.70
1.60
Max
2.523
2.422
2.321
2.220
2.119
2.018
1.917
1.816
1.715
1.614
Mn
2.43
2.33
2.23
2.13
2.04
1.94
1.84
1.75
1.65
1.55
Max
2.58
2.47
2.37
2.27
2.18
2.06
1.96
1.85
1.75
1.65
相關PDF資料 |
PDF描述 |
|---|---|
| AS1907C23-T | Low-Volt. Active-Low Push/Pull; Package Type: SOT23-3; Reset Type: Push/Pull Active-Low; Timeout Period: 100,00; Supervised Voltages (IN1): 2,30 |
| AS1907C24-T | Low-Volt. Active-Low Push/Pull; Package Type: SOT23-3; Reset Type: Push/Pull Active-Low; Timeout Period: 100,00; Supervised Voltages (IN1): 2,40 |
| AS1913TZ-T | Dual, Manual Reset Watchdog; Package Type: SOT23-6; Reset Type: Active-Low Push/Pull; Supervised Voltages (IN1): 3,08; Supervised Voltages (IN2): 2,31 |
| AS1914TZ-T | Dual, Manual Reset Watchdog; Package Type: SOT23-6; Reset Type: Active-High Push/Pull; Supervised Voltages (IN1): 3,08; Supervised Voltages (IN2): 2,31 |
| AS1915TZ-T | Dual, Manual Reset Watchdog; Package Type: SOT23-6; Reset Type: Active-Low Open Drain; Supervised Voltages (IN1): 3,08; Supervised Voltages (IN2): 2,31 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AS1907-C22-T | 功能描述:IC SUPERVISOR ACT LOW SOT23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| AS1907C22-T | 制造商:ams 功能描述:IC SUPERVISOR ACT LOW SOT23-3 |
| AS1907-C23-T | 功能描述:IC SUPERVISOR ACT LOW SOT23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
| AS1907C23-T | 制造商:ams 功能描述:IC SUPERVISOR ACT LOW SOT23-3 |
| AS1907-C24-T | 功能描述:IC SUPERVISOR ACT LOW SOT23-3 RoHS:是 類別:集成電路 (IC) >> PMIC - 監(jiān)控器 系列:- 標準包裝:1 系列:- 類型:簡單復位/加電復位 監(jiān)視電壓數(shù)目:1 輸出:開路漏極或開路集電極 復位:高有效 復位超時:- 電壓 - 閥值:1.8V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-TSOP（0.059"，1.50mm 寬）5 引線 供應商設備封裝:5-TSOP 包裝:剪切帶 (CT) 其它名稱:NCP301HSN18T1GOSCT |
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