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| 型号： | MIC2776N-YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR ADJ MCRPWR SOT23-5 |
| 标准包装： | 1 |
| 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： | 最小为 140 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 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： | 标准包装 |
| 产品目录页面： | 1112 (CN2011-ZH PDF) |
| 其它名称： | 576-1103-6 |
V CORE
1.0V 5%
MIC2776
/RST
R2
MIC2776
MICROPROCESSOR
VCORE
VI/O
V I/O R1
2.5V 5% 676k
1% VDD /RESET GND
IN
324k
1%
/MR GND
Manual
Reset
Figure 1. MIC2776 Example Design
Interfacing to Processors With Bidirectional Reset Pins
Some microprocessors have reset signal pins that are bi-
directional, rather than input only. The Motorola 68HC11
family is one example. Because the MIC2776N’s output is
open-drain, it can be connected directly to the processor ’s
reset pin using only the pull-up resistor normally required.
See Figure 2.
Micrel, Inc.
Ensuring Proper Operation at Low Supply
At levels of V DD below 1.2V, the MIC2776L’s /RST output
driver cannot turn on suf?ciently to produce a valid logic-low
on the /RST output. In this situation, other circuits driven by
/RST could be allowed to ?oat, causing undesired opera-
tion. (In most cases, however, it is expected that the circuits
driven by the MIC2776L will be similarly inoperative at V DD
≤ 1.2V.)
If a given application requires that /RST be valid below V DD =
1.2V, this can be accomplished by adding a pull-down resis-
tor to the /RST output. A value of 100kΩ 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 4.
The statements above also apply to the MIC2776H’s RST
output. That is, to ensure valid RST signal levels at V DD <
1.2V, a pull-up resistor (as opposed to a pull-down) should
be added to the RST output. A value of 100kΩ is typical for
this application as well. See Figure 5.
V CC
MICROPROCESSOR
VCC
V CC
MICROPROCESSOR
VCC
R1
R2
MIC2776N
VDD /RST
IN
/MR GND
100k
/RESET GND
R1
R2
Manual
Reset
MIC2776L
VDD /RST
IN
/MR GND
/RESET GND
100k
Rpull-down
Figure 2. Interfacing to Bidirectional Reset Pin
Transient Response
Figure 4. MIC2776L Valid /Reset Below 1.2V
The MIC2776 is inherently immune to very short negative-
going “glitches.” Very brief transients may exceed the voltage
threshold without tripping the output.
As shown in Figure 3, the narrower the transient, the deeper the
threshold overdrive that will be ignored by the MIC2776. The
graph represents the typical allowable transient duration for a
given amount of threshold overdrive that will not generate a reset.
V CC
R1
R2
MIC2776H
VDD RST
IN
MICROPROCESSOR
VCC
100k
Rpull-up
RESET GND
/MR
GND
40
35
30
25
20
15
10
5
Typical INPUT
Transient Response
Manual
Reset
Figure 5. MIC2776H Valid Reset Below 1.2V
0
0
100
200
300
RESET COMP. OVERDRIVE, V REF –V IN (mV)
Figure 3. Typical INPUT Transient Response
November 2005
7
MIC2776
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2777-17BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2777-17BM5 TR | 功能描述:IC SUPERVISOR DUAL MCPWR SOT23-5 RoHS:否 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 |
| MIC2777-17YM5 TR | 功能描述:监控电路 Dual Voltage Supervisor with 0.3V and 1.69V Thresholds, Active-High and Active-Low Push-Pull Outputs, 140ms Reset Pulse, Manual Reset, SOT23-5 (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 |
| MIC2777-22BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC2777-22BM5 TR | 功能描述:IC SUPERVISOR DUAL MCPWR SOT23-5 RoHS:否 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 |
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