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| 型号： | LTC694IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISORY CIRCUIT 8SOIC |
| 标准包装： | 100 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 4.65V |
| 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： | 管件 |
LTC690/LTC691
LTC694/LTC695
APPLICATIONS INFORMATION
The LTC691 and LTC695 provide an additional output
(Watchdog Output, WDO ) which goes low if the watchdog
timer is allowed to time out and remains low until set high
by the next transition on the WDI pin. WDO is also set high
when V CC falls below the reset voltage threshold or V BATT .
The LTC691 and LTC695 have two additional pins OSC SEL
and OSC IN, which allow reset active time and watchdog
timeout period to be adjusted per Table 2. Several con-
figurations are shown in Figure 12.
OSC IN can be driven by an external clock signal or an
external capacitor can be connected between OSC IN and
V CC = 5V
WDI
GND when OSC SEL is forced low. In these configura-
tions, the nominal reset active time and watchdog timeout
period are determined by the number of clocks or set by
the formula in Table 2. When OSC SEL is high or floating,
the internal oscillator is enabled and the reset active time
is fixed at 35ms minimum for the LTC691 and 140ms
minimum for the LTC695. OSC IN selects between the 1
second and 70ms minimum normal watchdog timeout
periods. In both cases, the timeout period immediately
after a reset is at least 1 second.
WDO
RESET
t 1
t 2
t 1 = RESET ACTIVE TIME
t 2 = NORMAL WATCHDOG TIME-OUT PERIOD
t 3 = WATCHDOG TIME-OUT PERIOD IMMEDIATELY
AFTER A RESET
t 3
t 1
690 F11
Figure 11. Watchdog Timeout Period and Reset Active Time
EXTERNAL CLOCK
EXTERNAL OSCILLATOR
5V
3
V CC
OSC SEL
8
5V
3
V CC
OSC SEL
8
LTC691
LTC695
LTC691
LTC695
4
GND
OSC IN
7
4
GND
OSC IN
7
INTERNAL OSCILLATOR
1.6 SECOND WATCHDOG
INTERNAL OSCILLATOR
100ms WATCHDOG
5V
3
V CC
OSC SEL
8
FLOATING
OR HIGH
5V
3
V CC
OSC SEL
8
FLOATING
OR HIGH
LTC691
LTC695
LTC691
LTC695
4
GND
OSC IN
7
FLOATING
OR HIGH
4
GND
OSC IN
7
690 F12
Figure 12. Oscillator Configurations
690ff
14
For more information www.linear.com/690
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相关代理商/技术参数 |
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