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参数资料
| 型号： | MAX6865UK23D2L+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISOR 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： | 高有效 |
| 复位超时： | 最小为 40 ms |
| 电压 - 阀值： | 2.313V |
| 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) |
Nanopower μP Supervisory Circuits with
Manual Reset and Watchdog Timer
V CC
WDI
t WDI
t WD
t RP
OV
V CC
RESET*
OV
*RESET IS THE INVERSE OF RESET.
Figure 3. Detailed Watchdog Input Timing Relationship
Detailed Description
RESET /RESET Output
A μP’s reset input starts the μP in a known state. The
MAX6854/MAX6855/MAX6856/MAX6858/MAX6860 –
MAX6869 μP supervisory circuits assert a reset to prevent
code-execution errors during power-up, power-down, and
brownout conditions. The MAX6854/MAX6855/MAX6856/
MAX6858/MAX6860–MAX6869 reset output is guaranteed
to be valid for V CC down to 1.1V.
Whenever V CC falls below the reset threshold, the reset
output asserts low for RESET and high for RESET.
Once V CC exceeds the reset threshold, an internal
timer keeps the reset output asserted for the specified
reset timeout period, then after this interval the reset
output deasserts (see Figure 2).
Manual Reset Input
Many μP-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. The MAX6854/
MAX6855/MAX6856/MAX6861 –MAX6869 feature an
MR input. A logic low on MR asserts a reset. Reset
remains asserted while MR is low and for the timeout
period, t RP , after MR returns high. The devices provide
an internal 10k ? pullup from MR to V CC . Leave MR
unconnected or connect to V CC if unused. MR can be
driven with CMOS logic levels or with open-drain/col-
lector outputs. Connect a normally open momentary
switch from MR to GND to implement a manual reset
Watchdog Input
The MAX6864 –MAX6869 ’s watchdog timer circuitry
monitors the μP’s activity. If the μP does not toggle
(low-to-high or high-to-low) the watchdog input (WDI)
within the watchdog timeout period (t WDI ), reset asserts
for the reset timeout period (t RP ). The internal timer is
cleared when reset asserts, when manual reset is
asserted, or by a rising or falling edge on WDI. The
watchdog input detects pulses as short as 150ns.
While reset is asserted the watchdog timer does not
count. As soon as reset deasserts, the watchdog timer
resumes counting (Figure 3).
Applications Information
Selecting the Reset Timeout Period
The reset timeout period for the MAX6854/MAX6855/
MAX6856/MAX6858/MAX6860/MAX6864–MAX6869 is
fixed (see Table 4). The MAX6861/MAX6862/MAX6863
feature a reset timeout select input, CT. Connect CT
according to Table 1 to select between the available
10ms and 150ms (min) reset timeout periods. The time-
out period can be changed while a reset timeout period
is in progress, but will not update until the reset timeout
period has expired.
Table 1. MAX6861/MAX6862/MAX6863
Reset Timeout Period Selection
function; external debounce circuitry is not required. If
MR is driven by long cables or the device is used in a
noisy environment, connect a 0.1μF capacitor from MR
to GND to provide additional noise immunity.
CT CONNECTION
LOW
HIGH
MIN
10
150
TYP
15
225
MAX
25
300
UNITS
ms
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6865UK23D2S+T | 功能描述:监控电路 Single nPower Supervisor 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 |
| MAX6865UK23D2S-T | 功能描述:监控电路 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 |
| MAX6865UK23D3L+T | 功能描述:监控电路 Single nPower Supervisor 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 |
| MAX6865UK23D3L-T | 功能描述:监控电路 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 |
| MAX6865UK23D3S | 制造商:Maxim Integrated Products 功能描述:NANOPOWER MICROPROCESSOR SUPERVISOR - Cut Tape Product |
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