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| 型号： | MAX816ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/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： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
±1% Accuracy, Low-Power, +3V and +5V
μP Supervisory Circuits
t WP
t WD
t WD
t WDO
t WD
V CC
? V LL 60mV
V CC
V RT
V LLT
V RT
WDI
0V
t RS
t RS
MR
WDO
V CC
0V
RESET
RESET
V CC
0V
V CC
V CC
MR
0
RESET
0V
V CC
t MD
t MR
WDO
(MAX815)
Figure 8. MAX815 Watchdog Timing
where C HOLD is the capacitance (in Farads), I LOAD is
the current being drained from the capacitor (in
Amperes), and V LR is the low-line to reset threshold dif-
ference (in Volts).
Manual Reset
Many μP-based products require manual-reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts reset. Reset remains asserted while MR is low,
and for t RS (200ms) after MR returns high. This input
has an internal pullup resistor, so it can be left open if
not used. MR can be driven with TTL/CMOS-logic lev-
els or with open-drain/collector outputs.
Connect a normally open momentary switch from MR to
GND to create a manual-reset function; external
debounce circuitry is not required.
The watchdog circuit can be used to force a reset in
the MAX815 by connecting WDO to MR. If MR is driven
from long cables, or the device is used in a noisy envi-
ronment, connect a 0.1μF capacitor to ground to pro-
vide additional noise immunity.
0
V CC
LOW LINE
(MAX814)
0
Figure 9. Timing Diagram
__________Applications Information
Low-Voltage Operation
The LOW LINE, PFO, and WDO outputs will be locked to
logic low when the power supply drops below the lock-
out threshold (typically 1V below the reset threshold).
Ensuring a Valid
RESET Output Down to V CC = 0V
When V CC falls below 1V, the RESET output no longer
sinks current, but becomes an open circuit. High-
impedance CMOS-logic inputs can drift to undeter-
mined voltages if left undriven. If a pulldown resistor is
added to the RESET pin as shown in Figure 10, any
stray charge or leakage currents will be drained to
ground, holding RESET low. Resistor value R1 is not
critical. It should be about 100k ? —large enough not to
load RESET, and small enough to pull RESET to
ground.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX817 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V Microprocessor Supervisory Circuits |
| MAX817_CPA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V Microprocessor Supervisory Circuits |
| MAX817_CSA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V Microprocessor Supervisory Circuits |
| MAX817_CUA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V Microprocessor Supervisory Circuits |
| MAX817_EPA | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:+5V Microprocessor Supervisory Circuits |
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