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参数资料
| 型号： | LTC693CSW#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/20页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISRY CIRCUIT 16SOIC |
| 标准包装： | 47 |
| 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： | 4.4V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 管件 |
LTC692/LTC693
APPLICATIONS INFORMATION
The LTC693 provides 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 LTC693 has 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-
?gurations 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
EXTERNAL CLOCK
GND when OSC SEL is forced low. In these con?gura-
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 ?oating,
the internal oscillator is enabled and the reset active time
is ?xed at 140ms minimum. 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.
EXTERNAL OSCILLATOR
5V
3
V CC
OSC SEL
8
5V
3
V CC
OSC SEL
8
LTC693
LTC693
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
LTC693
LTC693
4
GND
OSC IN
7
FLOATING
OR HIGH
4
GND
OSC IN
7
692_3 ? F12
Figure 12. Oscillator Con?gurations
Table 2. LTC693 Reset Active Time and Watchdog Timeout Selections
WATCHDOG TIMEOUT PERIOD
IMMEDIATELY AFTER RESET
RESET ACTIVE TIME
OSC SEL
Low
OSC IN
External Clock Input
NORMAL (SHORT PERIOD)
1024 clks
(LONG PERIOD)
4096 clks
LTC693
2048 clks
Low
External Capacitor*
400ms
47pF
C
1.6 sec
47pF
C
800ms
47pF
C
Floating or High
Floating or High
Low
Floating or High
100ms
1.6 sec
1.6 sec
1.6 sec
200ms
200ms
*The nominal internal frequency is 10.24kHz. The nominal oscillator frequency with external capacitor is f OSC (Hz) = 184,000
C (pF)
0692fb
15
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