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| 型号： | MAX6705SKA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR MPU LV SOT23-8 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 类型： | 多压监控器 |
| 监视电压数目： | 2 |
| 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： | 2.93V，可调 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-8 |
| 供应商设备封装： | SOT-23-8 |
| 包装： | 标准包装 |
| 其它名称： | MAX6705SKA+TDKR |
Low-Voltage, SOT23 μP Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
t WDI
t WD
t WD
WDI
WDO
+5V
0V
+5V
0V
t WD
V EXTERNAL
R1
MAX6701(A)–
MAX6708
PFI, RST_IN1, OR RST_IN2
+5V
R2
( ) ( V 0.62 - 1 )
V EXT-TH = 1 + R1 x 0.62V
R1 = R2 x
RESET
(RESET)
MR
0V
+5V
0V
+5V
0V
t RP
0.62V
EXT-TH
R2
WHERE V EXT-TH IS THE EXTERNAL VOLTAGE TRIP LEVEL.
( ) ARE FOR MAX6702(A)/MAX6706(A) ONLY.
Figure 7. MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/
MAX6706(A)/MAX6707(A) Watchdog Timing
Reset Input
The MAX6701(A)/MAX6702(A)/MAX6703(A) include two
adjustable reset inputs for monitoring up to a total of
three system voltages (including V CC ). The thresholds
for the monitored RST_IN supplies are externally set
with resistor-divider networks (Figure 8). The reset out-
put is asserted if any of the monitored supplies (V CC ,
RST_IN1, or RST_IN2) go below its specified threshold
and remains asserted for the reset timeout period after
all supplies are above their thresholds.
Applications Information
Ensuring a Valid RESET
Output Down to V CC = 0
When V CC falls below 1V, the MAX6701 – MAX6708
RESET output no longer sinks current — it becomes an
open circuit. High-impedance CMOS logic inputs can
drift to undetermined voltages if left undriven. If a pull-
down resistor is added to the RESET pin as shown in
Figure 9, any stray charge or leakage currents are
drained to ground, holding RESET low. A resistor value
(R1) is not critical; 100k ? is large enough not to load
RESET and small enough to pull RESET to ground. This
application works for push-pull output only (not for
open-drain resets).
Figure 8. Calculating Adjustable Voltage Thresholds
Monitoring Other System Voltages
Other systems can be monitored by connecting a volt-
age-divider to PFI and adjusting the ratio appropriately.
In noisy systems, a capacitor between PFI and GND
reduces the power-fail circuit ’ s sensitivity to high-fre-
quency noise on the line being monitored. Reset can
be asserted on other voltages in addition to the V CC
supply line. Connect PFO to MR to initiate a reset out-
put pulse when PFI drops below 0.62V. Figure 10
shows the MAX6704 – MAX6708 configured to assert a
reset output when the secondary supply falls below the
reset threshold.
Generating a Reset
from Watchdog Overflow
Connect WDO to MR to force a watchdog timeout to gen-
erate a reset pulse for only the reset timeout period on the
MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/
MAX6706(A)/MAX6707(A). When the MAX6704 watch-
dog times out, reset outputs are automatically asserted
(no external connections required). For the MAX6701/
MAX6702/MAX6703/MAX6705/MAX6706/MAX6707 non-A
versions, do not connect WDO to MR ; this creates a
locked condition.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6705TKA | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 UP SUPERVISOR WITH POWER F - Bulk 制造商:Rochester Electronics LLC 功能描述: |
| MAX6705TKA+ | 制造商:Maxim Integrated Products 功能描述:MAXIM MAX6705TKA+ PROCESSOR SUPERVISORS - Tape and Reel 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:Maxim MAX6705TKA+ Processor Supervisors |
| MAX6705TKA+T | 功能描述:监控电路 Single uPower 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 |
| MAX6705TKA-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 |
| MAX6705YKA | 制造商:Maxim Integrated Products 功能描述:LOW-VOLTAGE SOT23 UP SUPERVISOR WI - Rail/Tube |
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