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参数资料
| 型号： | MAX6722AUTSYD1+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| 中文描述： | 3-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封装： | LEAD FREE, MO-178AB, SOT-23, 6 PIN |
| 文件页数： | 2/43页 |
| 文件大小： | 948K |
| 代理商： | MAX6722AUTSYD1+T |
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Detailed Description
Supply Voltages
The MAX6715A–MAX6729A P supervisory circuits
maintain system integrity by alerting the P to fault con-
ditions. These ICs are optimized for systems that moni-
tor two or three supply voltages. The output-reset state
is guaranteed to remain valid while either VCC1 or VCC2
is above 0.8V.
Threshold Levels
Input-voltage threshold level combinations are indicat-
ed by a two-letter code in the Reset Voltage Threshold
Suffix Guide (Table 1). Contact factory for availability of
other voltage threshold combinations.
Reset Outputs
The MAX6715A–MAX6729A provide an active-low reset
output (RST) and the MAX6725A/MAX6726A also pro-
vide an active-high (RST) output. RST, RST, RST1, and
RST2 are asserted when the voltage at either VCC1 or
VCC2 falls below the voltage threshold level, RSTIN
drops below threshold, or MR is pulled low. Once reset
is asserted, it stays low for the reset timeout period
(see Table 2). If VCC1, VCC2, or RSTIN goes below the
reset threshold before the reset timeout period is com-
pleted, the internal timer restarts. The MAX6715A/
MAX6717A/ MAX6719A/MAX6721A/MAX6723A/
MAX6725A/MAX6727A/MAX6728A contain open-drain
reset outputs, while the MAX6716A/MAX6718A/
MAX6720A/MAX6722A/MAX6724A/MAX6726A/MAX6729A
contain push-pull reset outputs. The MAX6727A provides
two separate open-drain RST outputs driven by the same
internal logic.
Manual Reset Input
Many P-based products require manual reset capabil-
ity, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. A logic low on MR
asserts the reset output. Reset remains asserted while
MR is low for the reset timeout period (tRP) after MR
returns high. This input has an internal 50k
pullup
resistor to VCC1 and can be left unconnected if not
used. MR can be driven with CMOS logic levels, or with
open-drain/collector outputs. Connect a normally open
momentary switch from MR to GND to create a manual
reset function; external debounce circuitry is not
required. If MR is driven from long cables or if the
device is used in a noisy environment, connect a 0.1F
capacitor from MR to GND to provide additional noise
immunity.
Adjustable Input Voltage
The MAX6719A/MAX6720A and MAX6723A–MAX6727A
provide an additional input to monitor a third system volt-
age. The threshold voltage at RSTIN is typically 626mV.
Connect a resistor-divider network to the circuit as shown
in Figure 1 to establish an externally controlled threshold
voltage, VEXT_TH.
VEXT_TH = 626mV((R1 + R2) / R2)
Low-leakage current at RSTIN allows the use of large-
valued resistors resulting in reduced power consump-
tion of the system.
Watchdog Input
The watchdog monitors P activity through the watch-
dog input (WDI). To use the watchdog function, con-
nect WDI to a bus line or P I/O line. When WDI
remains high or low for longer than the watchdog time-
out period, the reset output asserts.
The MAX6721A–MAX6729A include a dual-mode
watchdog timer to monitor P activity. The flexible time-
out architecture provides a long period initial watchdog
mode, allowing complicated systems to complete
lengthy boots, and a short period normal watchdog
mode, allowing the supervisor to provide quick alerts
when processor activity fails. After each reset event
(VCC power-up/brownout, manual reset, or watchdog
reset), there is a long initial watchdog period of 35s
minimum. The long watchdog period mode provides an
extended time for the system to power-up and fully ini-
tialize all P and system components before assuming
responsibility for routine watchdog updates.
MAX6715A–MAX6729A
Dual/Triple, Ultra-Low-Voltage, SOT23 P
Supervisory Circuits
10
______________________________________________________________________________________
MAX6719A/
MAX6720A/
MAX6723A–
MAX6727A
VEXT_TH
R1
R2
RSTIN
GND
Figure 1. Monitoring a Third Voltage
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6722AUTSYD2+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTSYD3+ | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTSYD4+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTSYD5+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTSYD6+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6722AUTSYD2+T | 功能描述:监控电路 Dual 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 |
| MAX6722AUTSYD3+ | 制造商:Maxim Integrated Products 功能描述:PROCESSOR SUPERVISOR 2.925V/2.188V 15UA 6PIN SOT-23 - Rail/Tube |
| MAX6722AUTSYD3+T | 功能描述:监控电路 Dual 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 |
| MAX6722AUTSYD4+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 |
| MAX6722AUTSYD5+T | 功能描述:监控电路 Dual 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 |
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