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参数资料
| 型号： | TPS3305-18QDRQ1 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8 |
| 封装： | PLASTIC, SO-8 |
| 文件页数： | 12/16页 |
| 文件大小： | 458K |
| 代理商： | TPS3305-18QDRQ1 |
TPS330615Q1, TPS330618Q1, TPS330620Q1, TPS330625Q1, TPS330633Q1
DUAL PROCESSOR SUPERVISORY CIRCUITS WITH POWERFAIL
SGLS241 MARCH 2004
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
saving current while using the watchdog
The watchdog input is internally driven low during the first 7/8 of the watchdog time-out period, then momentarily
pulses high, resetting the watchdog counter. For minimum watchdog input current (minimum overall power consump-
tion), leave WDI low for the majority of the watchdog time-out period, pulsing it low-high-low once within 7/8 of the
watchdog time-out period to reset the watchdog timer. If instead WDI is externally driven high for the majority of the
time-out period, a current of 5 V/40 k
≈ 125 A can flow into WDI.
td
t(tout)
VDD
VIT
WDI
RESET
t
Figure 1. Watchdog Timing
power-fail comparator (PFI & PFO)
An additional comparator is provided to monitor voltages other than the nominal supply voltage. The power-fail-input
(PFI) will be compared with an internal voltage reference of 1.25 V. If the input voltage falls below the power-fail thresh-
old (VPFI) of typ. 1.25 V, the power-fail output (PFO) goes low. If it goes above 1.25 V plus about 10 mV hysteresis, the
output returns to high. By connecting 2 external resistors, it is possible to supervise any voltages above 1.25 V. The
sum of both resistors should be about 1 M
, to minimize power consumption and also to assure that the current in the
PFI pin can be neglected compared with the current through the resistor network. The tolerance of the external resis-
tors should be not more than 1% to ensure minimal variation of sensed voltage. If the power-fail comparator is unused,
connect PFI to ground and leave PFO unconnected.
PFI
PFO
VCC
GND
TPS3306
V(SENSE)
R1
1%
R2
1%
VPFI,trip = 1.25 V ×
R1 + R2
R2
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| TPS3305-25 | 制造商:TI 制造商全称:Texas Instruments 功能描述:双处理器监事 |
| TPS3305-25D | 功能描述:监控电路 Dual Processor 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 |
| TPS3305-25DG4 | 功能描述:监控电路 Dual Processor 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 |
| TPS3305-25DGN | 功能描述:监控电路 Dual Processor 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 |
| TPS3305-25DGNG4 | 功能描述:监控电路 Dual Processor 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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