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参数资料
| 型号： | MAX791ESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/19页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 备用电池电路 |
| 监视电压数目： | 1 |
| 输出： | 推挽式，图腾柱 |
| 复位： | 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： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
Microprocessor Supervisory Circuit
+5V
V CC
RESET
THRESHOLD
V CC
CE IN
MAX791
CE OUT
15 μ s
100 μ s
100 μ s
50 ? DRIVER
CE IN
CE OUT
C LOAD
RESET
RESET
Figure 7. Reset and Chip-Enable Timing
enables the MAX791 to be used with most μPs.
Chip-Enable Input
CE IN is high impedance (disabled mode) while RESET
is asserted.
During a power-down sequence where V CC passes
4.65V, CE IN assumes a high-impedance state when
the voltage at CE IN goes high or 15μs after reset is
asserted, whichever occurs first (Figure 7).
During a power-up sequence, CE IN remains high
impedance, regardless of CE IN activity, until reset is
deasserted following the reset-timeout period.
In the high-impedance mode, the leakage currents into
this input are ±1μA max over temperature. In the low-
impedance mode, the impedance of CE IN appears as
a 75 ? resistor in series with the load at CE OUT.
The propagation delay through the CE transmission
gate depends on both the source impedance of the
drive to CE IN and the capacitive loading on CE OUT
(see the Chip-Enable Propagation Delay vs. CE OUT
Load Capacitance graph in the Typical Operating
Characteristics ). The CE propagation delay is produc-
tion tested from the 50% point on CE IN to the 50%
point on CE OUT using a 50 ? driver and 50pF of load
capacitance (Figure 8). For minimum propagation
delay, minimize the capacitive load at CE OUT and use
GND
Figure 8. CE Propagation Delay Test Circuit
a low output-impedance driver.
Chip-Enable Output
In the enabled mode, the impedance of CE OUT is
equivalent to 75 ? in series with the source driving CE
IN. In the disabled mode, the 75 ? transmission gate is
off and CE OUT is actively pulled to V OUT . This source
turns off when the transmission gate is enabled.
LOWLINE Output
The low-line comparator monitors V CC with a typical
threshold voltage 150mV above the reset threshold,
and has 15mV of hysteresis. LOWLINE typically sinks
3.2mA at 0.1V. For normal operation (V CC above the
LOWLINE threshold), LOWLINE is pulled to V OUT . If
access to the unregulated supply is unavailable, use
LOWLINE to provide a nonmaskable interrupt (NMI) to
the μP as V CC begins to fall (Figure 9a).
Power-Fail Comparator
The power-fail comparator is an uncommitted compara-
tor that has no effect on the other functions of the IC.
Common uses include monitoring supplies other than
5V (see the Typical Operating Circuit and the
Monitoring a Negative Voltage section) and early
power-fail detection when the unregulated power is
easily accessible (Figure 9b).
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX791EUE | 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 |
| MAX791EUE+ | 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 |
| MAX791EUE+T | 功能描述:监控电路 Microprocessor Supervisory Circuit 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 |
| MAX791EUE-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 |
| MAX791MJE | 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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