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参数资料
| 型号： | MIC2774H-26YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 5/8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
Functional Diagram
V DD
Micrel
V REF
ONE SHOT
R
Q
/RST*
IN
DELAY
LINE
S
/Q
RST*
V DD
/MR
I PU
V REF
MIC2774
GND
* PINOUT ANDPOLARITY VARY BY DEVICE TYPE.
SEE ORDERING INF FO RMATION TABLE .
Functional Description
IN, Under-Voltage Detector Input
The voltage present at the IN pin is compared to the internal
300mV reference voltage. A reset is triggered if and when V IN
falls below V REF . Typically, a resistor divider is used to scale
the input voltage to be monitored such that V IN will fall below
V REF as the voltage being monitored falls below the desired
trip-point. Hysteresis is employed to prevent chattering due
to noise. The comparator on the IN pin is relatively immune
to very brief negative-going transients.
V DD Input
The V DD pin is both the power supply terminal and a monitored
input voltage. The voltage at this pin is continually compared
against the internal reference. The trip-point at which a reset
occurs is factory programmed. A reset is triggered if and
when V DD falls below the trip-point. Hysteresis is employed
to prevent chattering due to noise. The comparator on the
V DD input is relatively immune to very brief negative-going
transients.
RST, /RST Reset Output
Typically, the MIC2774 is used to monitor the power supplies
of intelligent circuits such as microcontrollers and micropro-
cessors. By connecting the appropriate reset output of a
MIC2774 to the reset input of a μC or μP, the processor will
be properly reset at power-on and during power-down and
brown-out conditions. In addition, asserting /MR, the manual
reset input, will activate the reset function.
The reset output is asserted any time /MR is asserted or if V IN
or V DD drops below the corresponding threshold voltage. The
reset output remains asserted for t RST (min) after V IN and/or
V DD subsequently return above the threshold boundaries
and/or /MR is released. A reset pulse is also generated at
power-on. Hysteresis is included in the comparators to prevent
chattering of the output due to noise.
/MR, Manual Reset Input
The ability to initiate a reset via external logic or a manual
switch is provided in addition to the MIC2774’s automatic
supervisory functions. Driving the /MR input to a logic low
causes an immediate and unconditional reset to occur.
Assuming V IN and V DD are within tolerance when /MR is
released (returns high), the reset output will be de-asserted
no less than t RST later. /MR may be driven by a logic signal,
or mechanical switch. Typically, a momentary push-button
switch is connected such that /MR is shorted to ground when
the switch contacts close. Switch de-bouncing is performed
internally; the switch may be connected directly between
/MR and GND. /MR is internally pulled-up to V DD and may
be left open if unused.
October 2005
5
M9999-102605
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