欢迎访问ic37.com |
会员登录 免费注册
发布采购

HA16117F 参数 Datasheet PDF下载

HA16117F图片预览
型号: HA16117F
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS看门狗定时器 [CMOS Watchdog Timer]
分类和应用:
文件页数/大小: 31 页 / 250 K
品牌: HITACHI-METALS [ HITACHI METALS, LTD ]
 浏览型号HA16117F的Datasheet PDF文件第2页浏览型号HA16117F的Datasheet PDF文件第3页浏览型号HA16117F的Datasheet PDF文件第4页浏览型号HA16117F的Datasheet PDF文件第5页浏览型号HA16117F的Datasheet PDF文件第6页浏览型号HA16117F的Datasheet PDF文件第7页浏览型号HA16117F的Datasheet PDF文件第8页浏览型号HA16117F的Datasheet PDF文件第9页  
HA16117F Series
CMOS Watchdog Timer
Description
The HA16117F Series of ICs make a micro-processor (MPU) system fail-safe by monitoring its power
supply to detect voltage drops, and monitoring a P-RUN (program running) pulse to detect system crashes.
Also referred to as watchdog timers, these devices are essential in systems that aim for high levels of crash
protection. Fabricated by a CMOS process, they consume little power and are ideally suited for battery-
operated systems.
These ICs are available in versions for industrial and communications equipment and automotive
applications, as well as for consumer products.
Functions
Power-on reset
Sends a
RES
signal to the MPU for a fixed time at power-on
Watchdog timer (WDT)
Monitors a P-RUN signal from the MPU and sends the MPU a
RES
signal if P-RUN departs from a
set frequency range
Auto-reset
Outputs
RES
signals to the MPU at clocked intervals while P-RUN remains abnormal
Supply voltage supervision
Outputs a low
RES
signal if the supply voltage (same as the MPU's V
CC
) falls below a low threshold
level (V
TL
). The threshold differs for different ICs in the series, allowing designers to choose an IC
matching system requirements (see ordering information)
Features
Low power consumption : Operating (ACC pin low) = 0.5 mW (Typ)
: Standby (ACC pin high) = 0.2 mW (Typ)
Watchdog timer on/off control by ACC input signal
Independent auto-reset high and low times (t
RH
and t
RL
)
Watchdog monitoring by frequency filtering (independent of duty cycle)
High-precision low voltage detection (±2%)
Space- and weight-saving 8-pin SOP package