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参数资料
| 型号： | MAX696CPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC MPU SUPERVISORY CIRCUIT 16DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 25 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 输出： | 推挽式，推挽式 |
| 复位： | 高有效/低有效 |
| 复位超时： | 最小为 35 ms |
| 电压 - 阀值： | 可调节/可选择 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 16-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 16-PDIP |
| 包装： | 管件 |
Microprocessor Supervisory Circuits
low for 50ms after LL IN rises above 1.3V. This prevents
repeated toggling of RESET even if the V CC power drops
out and recovers with each power line cycle.
The crystal oscillator normally used to generate the clock
for microprocessors takes several milliseconds to start.
Since most microprocessors need several clock cycles
to reset, RESET must be held low until the microproces-
sor clock oscillator has started. The power-up RESET
pulse lasts 50ms to allow for this oscillator startup time.
An inverted, active-high RESET output is also supplied.
Power-Fail Detector
The MAX696 issues a nonmaskable interrupt (NMI) to
the microprocessor when a power failure occurs. The
power line is monitored by two external resistors con-
nected to the power-fail input (PFI). When the voltage at
PFI falls below 1.3V, the power-fail output ( PFO ) drives
the processor’s NMI input low. An earlier power-fail
warning can be generated if the unregulated DC input
of the regulator is available for monitoring.
V BATT (MAX696)
Watchdog Timer
The microprocessor drives the watchdog input (WDI)
with an I/O line. When OSC IN and OSC SEL are uncon-
nected, the microprocessor must toggle the WDI pin
once every 1.6 seconds to verify proper software execu-
tion. If a hardware or software failure occurs so that WDI
is not toggled, the MAX696 will issue a 50ms RESET
pulse after 1.6 seconds. This typically restarts the micro-
processor’s power-up routine. A new RESET pulse is
issued every 1.6 seconds until WDI is again strobed.
The watchdog output ( WDO ) goes low if the watchdog
timer is not serviced within its timeout period. Once
WDO goes low, it remains low until a transition occurs
at WDI while RESET is high. The watchdog timer fea-
ture can be disabled by leaving WDI unconnected.
OSC IN and OSC SEL also allow other watchdog timing
options, as shown in Table 1 and Figure 7.
1
+
5
BATT ON (MAX696)
2
V CC
(MAX697) CHIP-ENABLE INPUT
LL IN
3
13
+
-
12
6
V OUT (MAX696)
CHIP-ENABLE OUTPUT (MAX697)
LOW LINE
-
15
RESET
16
7
RESET GENERATOR
RESET
OSC IN
TIMEBASE FOR RESET
OSC SEL
8
AND
WATCHDOG
WATCHDOG INPUT
11
WATCHDOG TRANSITION
WATCHDOG
TIMER
14
WATCHDOG OUTPUT
POWER-FAIL
INPUT
9
1.30V
+
-
DETECTOR
4
GROUND
10
POWER-FAIL OUTPUT
Figure 2. MAX696/MAX697 Block Diagram
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX696CPE+ | 功能描述:监控电路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX696CWE | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX696CWE+ | 功能描述:监控电路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX696CWE+T | 功能描述:监控电路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| MAX696CWE-T | 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
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