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参数资料
| 型号： | MAX6701ALKA+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Low-Voltage, SOT23, µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer |
| 中文描述： | 3-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | MO176BA, ROHS COMPLIANT, SOT-23, 8 PIN |
| 文件页数： | 30/30页 |
| 文件大小： | 1191K |
| 代理商： | MAX6701ALKA+ |
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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 VCC). 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 (VCC,
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 VCC = 0
When VCC 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).
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 VCC
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.
MAX6701–08/MAX6701A–03A/05A–07A
Low-Voltage, SOT23 P Supervisors with Power-
Fail In/Out, Manual Reset, and Watchdog Timer
_______________________________________________________________________________________
9
tWD
+5V
0V
WDI
+5V
0V
WDO
+5V
0V
RESET
+5V
0V
(RESET)
tRP
+5V
0V
MR
( ) ARE FOR MAX6702(A)/MAX6706(A) ONLY.
tWDI
Figure 7. MAX6701(A)/MAX6702(A)/MAX6703(A)/MAX6705(A)/
MAX6706(A)/MAX6707(A) Watchdog Timing
R1
R2
0.62V
PFI, RST_IN1, OR RST_IN2
VEXTERNAL
0.62
R1 = R2 x
(
VEXT-TH
- 1
)
R2
VEXT-TH =
(1 + R1) x 0.62V
WHERE VEXT-TH IS THE EXTERNAL VOLTAGE TRIP LEVEL.
MAX6701(A)–
MAX6708
Figure 8. Calculating Adjustable Voltage Thresholds
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6701ALKA+T | Low-Voltage, SOT23, µP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6701ALKA+ | 制造商:Maxim from Components Direct 功能描述:MAXIM MAX6701ALKA+ PROCESSOR SUPERVISORS - Tape and Reel 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.63V/ADJV/ADJV 12UA 8PIN SOT-23 - Cut Tape Product 制造商:Maxim 功能描述:Maxim MAX6701ALKA+ Processor Supervisors |
| MAX6701ALKA+T | 功能描述:监控电路 Triple 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 |
| MAX6701ALKA-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 |
| MAX6701AMKA | 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product |
| MAX6701AMKA+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 4.38V/ADJV/ADJV 12UA 8PIN SOT-23 - Cut Tape Product |
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