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参数资料
| 型号： | MAX696CPE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/15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
MAX697
The MAX697 is nearly identical to the MAX696. The
MAX697 lacks the battery-backup feature, so it does
not have the V BATT , V OUT , or BATT ON pins. This
allows the MAX697 to consume less than 250 microam-
peres, and it allows the inclusion of RAM write-protec-
tion pins. See Figure 2.
Detailed Description
Battery Switchover and V OUT (MAX696)
The battery-switchover circuit compares V CC to the
V BATT input, and connects V OUT to whichever is higher.
Switchover occurs when V CC is 50mV greater than
V BATT as V CC falls, and when V CC is 70mV more than
V BATT as V CC rises (see Figure 3). The switchover com-
parator has 20mV of hysteresis to prevent repeated,
rapid switching if V CC falls very slowly or remains near-
ly equal to the battery voltage.
When V CC is higher than V BATT , V CC is internally switched
to V OUT with a low-saturation pnp transistor. V OUT has
50mA output current capability. Use an external pnp pass
put current requirement at V OUT exceeds 50mA or if a
lower V CC - V OUT voltage differential is desired. The
BATT ON output can directly drive the base of the
external transistor.
It should be noted that the MAX696 need only supply the
average current drawn by the CMOS RAM if there is ade-
quate filtering. Many RAM data sheets specify a 75mA
maximum supply current, but this peak current spike
lasts only 100ns. A 0.1μF bypass capacitor at V OUT sup-
plies the high instantaneous current, while V OUT need
only supply the average load current, which is much
less. A capacitance of 0.1μF or greater must be connect-
ed to the V OUT terminal to ensure stability.
A 200 ? MOSFET connects the V BATT input to V OUT
during battery backup. This MOSFET has very low
input-to-output differential (dropout voltage) at the low
current levels required for battery backup of CMOS
RAM or other low-power CMOS circuitry. When V CC
equals V BATT , the supply current is typically 12μA.
When V CC is between 0V and (V BATT - 700mV), the typ-
ical supply current is only 600nA (typ), 1μA (max).
transistor in parallel with the internal transistor if the out-
V CC
+5V
TO CMOS
VCC
V OUT
RAM AND
REAL-TIME
CLOCK
BASE DRIVE
P
p-CHANNEL
MOSFET
0.1 μ F
V CC IN
3V
BATTERY
INPUT
V BATT
100mV
+
-
BATT ON
700mV
+
-
LOW IQ MODE SELECT
INTERNAL
SHUTDOWN
SIGNAL WHEN
V BATT CC + 0.7V
>V
Figure 3. MAX696 Battery-Switchover Block Diagram
8
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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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