参数资料
| 型号： | MAX6369KA-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/10页 |
| 文件大小： | 0K |
| 描述： | IC WATCHDOG TIMER SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 监视器电路 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 可调节/可选择 |
| 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： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 剪切带 (CT) |
| 其它名称： | MAX6369KA-TCT |
MAX6369–MAX6374
Pin-Selectable Watchdog Timers
completion of the startup delay period, and no watch-
dog output pulses are asserted during the startup
delay. When the startup delay expires, the watchdog
begins counting its normal watchdog timeout period
and waiting for WDI transitions. The startup delay
allows time for the μP system to power up and fully ini-
tialize before assuming responsibility for the normal
watchdog timer updates. Startup delay periods vary
between the different devices and may be altered by
the logic control set pins. To ensure that the system
generates no undesired watchdog outputs, the routine
watchdog input transitions should begin before the
selected minimum startup delay period has expired.
The normal watchdog timeout period countdown is initi-
ated when the startup delay is complete. If a valid logic
transition is not recognized at WDI before the watchdog
timeout period has expired, the supervisor asserts a
watchdog output. Watchdog timeout periods vary
between the different devices and may be altered by
the logic control set pins. To ensure that the system
generates no undesired watchdog outputs, the watch-
dog input transitions should occur before the selected
minimum watchdog timeout period has expired.
The startup delay and the watchdog timeout period are
determined by the states of the SET0, SET1, and SET2
pins, and by the particular device within the family. For
the MAX6369 and MAX6370, the startup delay is equal
to the watchdog timeout period. The startup and
watchdog timeout periods are pin selectable from 1ms
to 60s (minimum).
For the MAX6371 and MAX6372, the startup delay is
fixed at 60s and the watchdog timeout period is pin
selectable from 1ms to 60s (minimum).
The MAX6373/MAX6374 provide two timing variations
for the startup delay and normal watchdog timeout.
Five of the pin-selectable modes provide startup delays
from 200μs to 60s minimum, and watchdog timeout
t WD
delays from 3ms to 10s minimum. Two of the selectable
modes do not initiate the watchdog timer until the
device receives its first valid watchdog input transition
(there is no fixed period by which the first input must be
received). These two extended startup delay modes
are useful for applications requiring more than 60s for
system initialization.
All the MAX6369–MAX6374 devices may be disabled
with the proper logic control pin setting (Table 1).
Applications Information
Input Signal Considerations
Watchdog timing is measured from the last WDI rising
or falling edge associated with a pulse of at least 100ns
in width. WDI transitions are ignored when WDO is
asserted, and during the startup delay period (Figure
2). Watchdog input transitions are also ignored for a
setup period, t SETUP , of up to 300μs after power-up or
a setting change (Figure 3).
Selecting Device Timing
SET2, SET1, and SET0 program the startup delay and
watchdog timeout periods (Table 1). Timeout settings
can be hard wired, or they can be controlled with logic
gates and modified during operation. To ensure smooth
transitions, the system should strobe WDI immediately
before the timing settings are changed. This minimizes
the risk of initializing a setting change too late in the
timer countdown period and generating undesired
watchdog outputs. After changing the timing settings,
two outcomes are possible based on WDO . If the
change is made while WDO is asserted, the previous
setting is allowed to finish, the characteristics of the
new setting are assumed, and the new startup phase is
entered after a 300μs setup time (t SETUP ) elapses. If
the change is made while WDO is not asserted, the
new setting is initiated immediately, and the new start-
up phase is entered after the 300μs setup time elapses.
WDI
WDO
*
*
*
t WD
*
*
t WD
SET_
t SETUP
t DELAY
t WD
t SETUP
t DELAY
t WD
*IGNORED EDGE
Figure 3. Setting Change Timing
Maxim Integrated
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX636AC/D | 功能描述:直流/直流开关调节器 Preset/Adjustable Output CMOS Inverting Switching Regulators RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX636ACJA | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX636ACPA | 功能描述:直流/直流开关调节器 Preset/Adjustable Invert Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX636ACPA+ | 功能描述:直流/直流开关调节器 Preset/Adjustable Invert Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX636ACSA | 功能描述:直流/直流开关调节器 Preset/Adjustable Invert Switching Reg RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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