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参数资料
| 型号： | MIC2774H-26YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR DUAL LV SOT23-5 |
| 标准包装： | 3,000 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 补充型 |
| 复位： | 高有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 2.67V，可调 |
| 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： | 带卷 (TR) |
| 其它名称： | MIC2774H-26YM5TR MIC2774H-26YM5TR-ND |
MIC2774
Micrel
T YPIC AL V
V CORE
1.0V 5%
MICROPROCESSOR
VCORE
100
DD
T RANS IENT R ES PONS E
V I/O
2.5V 5%
R1
676K
1%
R2
324K
1%
MIC2774L-23
VDD /RST
IN
VI/O
/RESET
GND
80
60
40
MANUAL
/MR
GND
20
0
500
1000
1500
2000
V CC
MIC2774N-
MIC2774N-X X
/RESET
GND
/MR
GND
RESET
Figure 1. MIC2774 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 MIC2774N’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.
MICROPROCESSOR
VCC
100K
VDD /RST
R1
IN
R2
Figure 2. Interfacing to Bidirectional Reset Pin
Transient response
0
RESET COMP. OVERDRIVE, V REF –V DD (MV)
Figure 3b. Typical V DD Transient Response
Ensuring Proper Operation at Low Supply
At levels of V DD below 1.2V, the MIC2774’s reset output can-
not turn on suf? ciently to produce a valid logic-low on /RST.
In this situation, circuits driven by /RST could be allowed to
? oat, causing undesired operation. (In most cases, however,
it is expected that the circuits driven by the MIC2774L 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 re-
sistor to the /RST output. A value of 100kΩ is recommended
as this is usually an acceptable compromise of quiescent
current and pull-down current. The resistor ’s value is not
critical, however. See Figure 4.
The statements above also apply to the MIC2774H’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.
The MIC2774 is inherently immune to very short negative-
going “glitches.” Very brief transients may exceed the voltage
thresholds without tripping the output.
V CC
MIC2774L-X X
MICROPROCESSOR
VCC
As shown in Figure 3a and 3b, in general the narrower the
transient, the deeper the threshold overdrive that will be
ignored by the MIC2774. The graphs represent the typical
allowable transient duration for a given amount of threshold
overdrive that will not generate a reset.
T YPIC AL IN
T RANS IENT R ES PONS E
40
MANUAL
RESET
R1
R2
VDD
IN
/MR
/RST
GND
/RESET
100K
RPULL-DO WN
GND
35
30
25
Figure 4. MIC2774L Valid /RST Below 1.2V
20
V CC
MICROPROCESSOR
15
10
5
0
0
100
200
300
R1
R2
MIC2774H-X X
VDD RST
IN
100K
RPULL-UP
VCC
RESET
GND
RESET COMP. OVERDRIVE, V REF –V IN (MV)
Figure 3a. Typical INPUT Transient Response
MANUAL
RESET
/MR
GND
Figure 5. MIC2774H Valid RST Below 1.2V
October 2005
7
M9999-102605
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