- 您现在的位置：买卖IC网 > PDF目录67811 > MAX6722AUTTED1+T (MAXIM INTEGRATED PRODUCTS INC) Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits PDF资料下载
参数资料
| 型号： | MAX6722AUTTED1+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： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO6 |
| 封装： | ROHS COMPLIANT, SOT-23, 6 PIN |
| 文件页数： | 3/18页 |
| 文件大小： | 186K |
| 代理商： | MAX6722AUTTED1+T |
MAX6715A–MAX6729A/MAX6797A
Dual/Triple, Ultra-Low-Voltage, SOT23 P
Supervisory Circuits
_
__
_
11
The normal watchdog timeout period (1.12s min)
begins after the first transition on WDI before the con-
clusion of the long initial watchdog period (Figure 2).
During the normal operating mode, the supervisor will
issue a reset pulse for the reset timeout period if the P
does not update the WDI with a valid transition (high-to-
low or low-to-high) within the standard timeout period
(1.12s min).
Leave WDI unconnected to disable the watchdog timer.
The WDI unconnected-state detector uses a small
(200nA typ) current source. Therefore, do not connect
WDI to anything that will source more than 50nA.
Power-Fail Comparator
PFI is the noninverting input to a comparator. If PFI is
less than VPFI (626.5mV), PFO goes low. Common uses
for the power-fail comparator include monitoring prereg-
ulated input of the power supply (such as a battery) or
providing an early power-fail warning so software can
conduct an orderly system shutdown. It can also be
used to monitor supplies other than VCC1 or VCC2 by
setting the power-fail threshold with a resistor-divider, as
shown in Figure 3. PFI is the input to the power-fail com-
parator. The typical comparator delay is 2s from PFI to
PFO. Connect PFI to ground of VCC1 if unused.
Ensuring a Valid Reset Output
Down to VCC = 0V
The MAX6715A–MAX6729A/MAX6797A are guaranteed
to operate properly down to VCC = 0.8V. In applications
that require valid reset levels down to VCC = 0V, use a
pulldown resistor at RST to ground. The resistor value
used is not critical, but it must be large enough not to
load the reset output when VCC is above the reset thresh-
old. For most applications, 100kΩ is adequate. This con-
figuration does not work for the open-drain outputs of the
MAX6715A/MAX6717A/MAX6719A/MAX6721A/
MAX6723A/MAX6725A/MAX6727A/MAX6728A. For push-
pull, active-high RST output connect the external resistor
as a pullup from RST to VCC1.
1.12s MAX
tWDI-NORMAL
1.12s MAX
tWDI-STARTUP
35s MAX
VTH
VCC
WDI
RST
tRP
Figure 2. Normal Watchdog Startup Sequence
MAX6728A/
MAX6729A/
MAX6797A
R1
R2
PFI
GND
VIN
PFO
VTRIP = VPFI
R1 + R2
R2
()
MAX6728A/
MAX6729A/
MAX6797A
R1
R2
PFI
GND
VCC
VIN
PFO
VTRIP = R2 (VPFI)
1
R1
1
R2
+-
VCC
R1
[]
()
VPFI = 626.5mV
A)
B)
Figure 3. Using Power-Fail Input to Monitor an Additional
Power-Supply a) VIN is Positive b) VIN is Negative
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6722AUTTED2+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTTED3+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTTED4+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTTED5+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
| MAX6722AUTTED6+T | Dual/Triple Ultra-Low-Voltage SOT23 µP Supervisory Circuits |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6722AUTTED2+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 |
| MAX6722AUTTED3+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 |
| MAX6722AUTTED4+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 |
| MAX6722AUTTED5+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 |
| MAX6722AUTTED6+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 |
发布紧急采购，3分钟左右您将得到回复。