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| 型号： | SP691ACT-L |
| 厂商： | Exar Corporation |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LP 16WSOIC |
| 标准包装： | 41 |
| 类型： | 简单复位/加电复位 |
| 监视电压数目： | 1 |
| 输出： | 开路漏极，推挽式 |
| 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： | 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 W |
| 包装： | 管件 |
| 其它名称： | SP691ACT-L-ND |
+5V
V IN
* Minimum value of R P is 1k ? .
Maximum value of R P is dependent
on the connected number of RAMs, n.
V CC
R 1
CE IN
13
2
V OUT
R P *
PFI
R 3
*C 1
R 2
GND
4
12
CE OUT
CE
CE
RAM 1
GND
PFO
*optional
connect to μ P
CE
CE
RAM 2
V TRIP =
1.25
R 2
R 1 + R 2
+
=
Active-HIGH
CE Logic Lines
for Memory Devices
CE
CE
RAM 3
1.25
R 2
V L - 1.25 5.0 - 1.25
1.25
V H =
R 2 || R 3
R 1 R 3
CE
PFO
R 1 + R 2 || R 3
CE
RAM n
+5V
0V
0V
V L V TRIP V H
V IN
Figure 26. Alternate Chip Enable Gating
and connect CE OUT to the CE input of each
memory device as shown in Figure 26 . The CE
input of each part then connects directly to the
chip-select logic, which does not have to gated
by the SP691A/693A/800L/800M devices.
Adding Hysteresis to the Power-Fail
Comparator
Hysteresis adds noise margin to the power-fail
comparator and prevents repeated triggering of
PFO when V IN is near the power-fail comparator
trip point. Figure 27 shows how to add hysteresis
to the power-fail comparator. Select the ratio of
R1 and R2 such that PFI sees 1.25V when V IN
falls to the desired trip point (V TRIP ). Resistor
R3 adds hysteresis. It will typically be an order
of magnitude greater than R1 or R2. The
current through R1 and R2 should be at least
1 μ A to ensure that the 25nA (max) PFI input
current does not shift the trip point. R3 should
Figure 27. Adding Hysteresis to the Power-Fail
Comparator
be larger than 10k ? to prevent it from loading
down the PFO pin. Capacitor C1 adds additional
noise rejection.
Monitoring a Negative Voltage
The power-fail comparator can be used to monitor
a negative supply voltage using the circuit shown
in Figure 28 . When the negative supply is valid,
PFO is low. When the negative supply voltage
drops, PFO goes high. This circuit's accuracy is
affected by the PFI threshold tolerance, the V CC
voltage, and resistors R1 and R2.
Backup-Battery Replacement
The backup battery may be disconnected while
V CC is above the reset threshold. No precautions
are necessary to avoid spurious reset pulses.
Date: 4/18/05
SP691A/693A/800L/800M Low Power Microprocessor Supervisor with Battery Switch-Over ? Copyright 2005 Sipex Corporation
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP691ACT-L/TR | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV 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 |
| SP691AEN | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691AEN/TR | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Low Power Microprocessor Supervisory with Battery Switch-Over |
| SP691AEN-L | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV 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 |
| SP691AEN-L/TR | 功能描述:监控电路 LW PWR MICRO 5.5V 25mA-250mA BAT SW/OV 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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