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参数资料
| 型号： | MAX6843UKD3+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/9页 |
| 文件大小： | 0K |
| 描述： | IC MPU DETECT RESET SOT23-5 |
| 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，图腾柱 |
| 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： | 带卷 (TR) |
Ultra-Low-Voltage μP Reset Circuits and
Voltage Detectors
Functional Diagrams
V CC
MR
V CC
MR
V REF
MR
PULLUP
MANUAL
RESET
DETECT
MAX6841
MAX6842
MR
PULLUP
V REF = 187.4mV
MANUAL
RESET
DETECT
MAX6843
MAX6844
MAX6845
RESET IN
RESET
TIMEOUT
PERIOD
RESET
OUTPUT
RESET
RESET
RESET
TIMEOUT
PERIOD
RESET
OUTPUT
RESET
RESET
GND
Detailed Description
Reset Output
A microprocessor’s (μP’s) reset input starts the μP in a
known state. The MAX6841–MAX6845 assert a reset dur-
ing power-up, power-down, and brownout conditions.
When the V CC supply voltage falls below a preset thresh-
old (MAX6841/MAX6842) or RESET IN falls below the
adjustable threshold (MAX6843/MAX6844/MAX6845),
reset asserts and stays asserted for a fixed timeout delay
(Table 2) after V CC or RESET IN has risen above the
reset threshold. The MAX6841–MAX6845 are available
with five typical timeout options for each part: 150μs
(voltage detector), 1.5ms, 30ms, 210ms, and 1.68s.
The MAX6841/MAX6842 have two reset outputs
(RESET and RESET ); one is the inverse of the other.
The MAX6841 has one active-high push-pull output and
one active-low push-pull output. The MAX6842 has one
GND
tion, connect a normally open momentary switch from
MR to ground; external debounce circuitry is not
required. If MR is driven from long cables or the device
is used in a noisy environment, connect a 0.1μF capac-
itor from MR to ground to provide additional noise
immunity.
RESET IN
The MAX6843/MAX6844/MAX6845 feature a RESET IN
input, which allows users to adjust the reset threshold
voltage. The internal reference voltage is 187.4mV with
respect to V CC . An external resistive-divider network
can be used to set voltage monitoring thresholds, as
shown in Figure 1. The resistive-divider network must
be referenced to V CC . As V CC falls, the voltage at
V CC
active-high push-pull output and one active-low open-
drain output. The MAX6843 features an active-low
push-pull output. The MAX6844 features an active-
R1
RESET IN
V CC
high push-pull output, and the MAX6845 has an active-
low open-drain output stage. Connect a pullup resistor
from the open-drain RESET output to any voltage
between 0 and 6V.
Manual Reset Input
Many μP-based systems require a manual reset capa-
R2
MR
MAX6843
MAX6844
MAX6845
GND
RESET
(RESET)
( ) ARE FOR
R1 =
V CC-TH MAX6844
bility, allowing the operator, a test technician, or exter-
nal logic circuitry to initiate a reset. Reset remains
asserted while MR is low, and for a fixed timeout delay
after MR returns high. This input has an internal 20k ?
pullup resistor, so it can be left open if it is not used.
MR can be driven with CMOS logic level or with open-
drain/collector outputs. To create a manual reset func-
R2
-1
V REF
WHERE V REF = 187.4mV (WITH RESPECT TO V CC ) AND
V CC-TH IS THE V CC THRESHOLD.
Figure 1. Setting the Adjustable Threshold Externally
_______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX6843UKD4 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6843UKD4+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR ADJV 8.1UA 5PIN SOT-23 - Rail/Tube |
| MAX6843UKD4+T | 功能描述:监控电路 NULL 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 |
| MAX6843UKD4-T | 功能描述:监控电路 NULL 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 |
| MAX6844UKD0 | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
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