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| 型号： | AS1908-C16-T |
| 厂商： | ams |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR ACT HIGH SOT23-3 |
| 标准包装： | 1 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 高有效 |
| 复位超时： | 最小为 100 ms |
| 电压 - 阀值： | 1.6V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-236-3，SC-59，SOT-23-3 |
| 供应商设备封装： | SOT-23-3 |
| 包装： | 标准包装 |
| 其它名称： | AS1908-C16-TDKR |
AS1907/AS1908/AS1909
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
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 Maximum Transient Duration vs. Reset
Comparator Overdrive graph (see page 5) shows the maximum pulse width that a negative-going V CC transient may typically have without
issuing a reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases.
8.2 Valid Reset Output
If V CC falls below 1V and approaches the minimum operating voltage of 0.7V, push/pull-type reset sinking/sourcing capabilities greatly decrease.
High-impedance CMOS-logic inputs connected to RESET can drift to indeterminate voltages, although this is normally not a problem since most
microprocessors 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
eliminate 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.
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
Min
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
Min
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
8.3 Bi-Directional Microprocessor Interface
The RESET output on the AS1909 is open-drain, thus this device can interface easily with microprocessors that have bi-directional reset pins,
Connect the RESET output of this device directly to the microprocessor ’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 optimum performance.
?? 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.
www.ams.com/Supervisors/AS1907-09
Revision 1.8
7 - 10
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相关代理商/技术参数 |
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| AS1908C16-T | 制造商:ams 功能描述:IC SUPERVISOR ACT HIGH SOT23-3 |
| AS1908-C18-T | 功能描述:IC SUPERVISOR ACT HIGH SOT23-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| AS1908C18-T | 制造商:ams 功能描述:IC SUPERVISOR ACT HIGH SOT23-3 制造商:ams 功能描述:IC MPU SUPERVISOR 7 3.6V 3-SOT-23 制造商:ams 功能描述:T&R / SOT23-3 |
| AS1908-C20-T | 功能描述:IC SUPERVISOR ACT HIGH SOT23-3 RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 类型:简单复位/加电复位 监视电压数目:1 输出:开路漏极或开路集电极 复位:高有效 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| AS1908C20-T | 制造商:AMS 功能描述:IC MPU SUPERVISOR 7 3.6V 3-SOT-23 |
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