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参数资料
| 型号： | LTC691CSW#TR |
| 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： | 1,000 |
| 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 35 ms |
| 电压 - 阀值： | 4.65V |
| 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： | 带卷 (TR) |
| 其它名称： | LTC691CSWTR |
LTC690/LTC691
LTC694/LTC695
APPLICATIONS INFORMATION
Table 2. LTC691 and LTC695 Reset Active Time and Watchdog Timeout Selections
WATCHDOG TIME-OUT PERIOD
RESET ACTIVE TIME
OSC SEL
Low
OSC IN
External Clock Input
NORMAL
(Short Period)
1024 clks
IMMEDIATELY
AFTER RESET
(Long Period)
4096 clks
LTC691
512 clks
LTC695
2048 clks
Low
External Capacitor*
400ms
70pF
? C
1.6sec
70pF
? C
200ms
70pF
? C
800ms
70pF
? C
Floating or High
Floating or High
Low
Floating or High
100ms
1.6 sec
1.6 sec
1.6 sec
50ms
50ms
200ms
200ms
*The nominal internal frequency is 10.24kHz. The nominal oscillator frequency with external capacitor is f OSC (Hz) =
Pushbutton Reset
184,000
C(pF) ? 1025
The LTC690 family does not provide a logic input for direct
connection to a pushbutton. However, a pushbutton in
series with a 100Ω resistor connected to the RESET output
pin (Figure 13) provides an alternative for manual reset.
Connecting a 0.1μF capacitor to the RESET pin debounces
the pushbutton input.
5V
V CC RESET
LTC690/LTC691
LTC694/LTC695
GND
0.1 μ F
100
RESET
MPU
(e.g. 6805)
690 F13
LTC1235
The 100Ω resistor in series with the pushbutton is required
to prevent the ringing, due to the capacitance and lead
inductance, from pulling the RESET pins of the MPU and
LTC69X below ground.
If a dedicated pushbutton reset input is desired, the
LTC1235 is a good choice (Figure 14). It has all the func-
tions of the LTC695 and provides pushbutton reset as an
extra feature. Its pushbutton is internally debounced and
invokes the normal 200ms reset sequence. This eliminates
the need for the 100Ω resistor and 0.1μF capacitor. It also
provides a more consistent reset pulse.
Figure 13. The External Pushbutton Reset
5V V CC RESET RESET
MPU
(e.g. 6805)
PBRST
GND 690 F14
Figure 14. The External Pushbutton Reset with the LTC1235
690ff
For more information www.linear.com/690
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC691I | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC691IN | 功能描述:IC MPU SUPERVISORY CIRCUIT 16DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 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 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC691IN#PBF | 功能描述:IC MPU SUPERVISORY CIRCUIT 16DIP RoHS:是 类别:集成电路 (IC) >> PMIC - 监控器 系列:- 标准包装:1 系列:- 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 复位超时:- 电压 - 阀值:1.8V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-TSOP（0.059"，1.50mm 宽）5 引线 供应商设备封装:5-TSOP 包装:剪切带 (CT) 其它名称:NCP301HSN18T1GOSCT |
| LTC691INPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
| LTC691IN-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Microprocessor Supervisory Circuits |
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