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参数资料
| 型号： | MIC809-5SU TR |
| 厂商： | Micrel Inc |
| 文件页数： | 5/6页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR 2.93V VTH SOT23-3 |
| 标准包装： | 3,000 |
| 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： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.93V |
| 工作温度： | -40°C ~ 85°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： | 带卷 (TR) |
| 其它名称： | MIC809-5SUTR MIC809-5SUTR-ND |
V = 2.932
MIC809-5
Applications Information
Microprocessor Reset
The /RESET pin is asserted whenever V CC falls below the
reset threshold voltage. The /RESET pin remains asserted
for a period of 30ms after V CC has risen above the reset
threshold voltage. The reset function ensures the micropro-
cessor is properly reset and powers up in a known condition
after a power failure. /RESET will remain valid with V CC as
low as 1V.
Transients on V CC
The MIC809-5 is inherently immune to very short “glitches”
on VCC. In the case of very brief transients, VCC may drop
below the reset-voltage threshold without triggering a reset.
As shown in the graph, the MIC809-5 is relatively immune
to transients with typical duration of 20μs. The lines on the
graph of Figure 1 represent the typical allowable transient
duration for a given amount of threshold overdrive that will
not generate a reset. The data was taken by adding nega-
tive-going square-wave pulse to a DC input voltage set at
0.5V above actual measured threshold for the part being
characterized.
Typical Transient
Response
25
TH
20
15
Micrel
V CC
V CC
V IN
MIC809
/RESET /RESET INPUT
Microcontroller
GND or
R PULL-DOWN Microprocessor
100k
GND
Figure 2. Ensuring a Valid
/RESET Signal at Low Voltage
Interfacing to Processors with Bidirectional Reset Pins
Some microprocessors have reset signal pins that are bidi-
rectional, rather than input only. The Motorola 68HC11 fam-
ily is one example. To prevent excessive current ?ow when
the processor asserts its reset output, a series resistor is
employed between the MIC809-5’s output and the reset pin.
This limits the current that will ?ow between the MIC809-5
and the reset pin to a theoretical maximum of V CC /R SERIES .
Because this resistor also limits the drive capability of the
supervisor ’s output, a buffer may be required to drive ad-
ditional circuitry. See Figure 3.
10
5
0
0 200 400 600 800 1000
RESET COMP. OVERDRIVE, V TH –V CC (mV)
V CC
V IN
BUFFER
V CC
RESET SIGNAL
to OTHER CIRCUITS
/RESET
RESET I/O
or
Figure 1. Comparator Overdrive
vs. Duration
Ensuring Proper Operation at Low V CC
At levels of V CC below 1V, the MIC809-5’s output driver cannot
always turn on suf?ciently to produce a valid logic-low. In this
situation, other circuits driven by /RESET could be allowed to
?oat, causing undesired operation. (In most cases, however,
it is expected that the circuits driven by the MIC809-5 will be
similarly inoperative at V CC =1V.)
If a given application requires that /RESET be valid below
V CC = 1V, this can be accomplished by adding a pull-down
resistor to the output. A value of 100k ? is recommended, as
this is usually an acceptable compromise of leakage current
and pull-down current. The resistor ’s value is not critical,
however. See Figure 2.
MIC809
4.7k
Microcontroller
GND
Microprocessor
GND
Figure 3. Interfacing to Processors
with Bidirectional Reset Pins
July 2005
5
M9999-071305
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC809-5SUY | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC809-5SUY TR | 功能描述:监控电路 3-Pin Microprocessor Reset Circuit with Push-Pull Active-Low Output, 2.93V Threshold, 30ms reset pulse in SOT23-3 - Lead Free RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MIC809-5SUY-TR | 功能描述:Supervisor Push-Pull, Totem Pole 1 Channel SOT-23-3 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 类型:简单复位/加电复位 受监控电压数:1 输出:推挽式，图腾柱 复位:低有效 复位超时:最小为 140 ms 电压 - 阈值:2.93V 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:TO-236-3，SC-59，SOT-23-3 供应商器件封装:SOT-23-3 标准包装:1 |
| MIC809-5SYC3 | 功能描述:IC SUPERVISOR 2.93V VTH SC70 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:低有效 复位超时:标准传输延迟为 60 µs 电压 - 阀值:3V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:Digi-Reel® 其它名称:LM8364BALMF30DKR |
| MIC809-5SYC3 TR | 功能描述:监控电路 3-Pin Microprocessor Reset Circuit with Push-Pull Active-Low Output, 2.93V Threshold, 30ms reset pulse in SC70-3 - Lead Free RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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