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TPS3617

更新时间： 2024-10-14 22:52:55
品牌 Logo 应用领域
德州仪器 - TI 电池
页数 文件大小 规格书
14页 310K
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BATTERY-BACKUP SUPERVISOR FOR RAM RETENTION

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TPS3617 数据手册

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TPS3617  
TPS3618  
www.ti.com  
SLVS339C–DECEMBER 2000–REVISED NOVEMBER 2004  
BATTERY-BACKUP SUPERVISOR FOR RAM RETENTION  
FEATURES  
DESCRIPTION  
•
•
•
Supply Current of 40 µA (Max)  
The TPS3617 and TPS3618 are battery-backup  
supervisors that monitor 5 V supplies. They provide a  
battery-backup function ideal for applications that  
require data retention of CMOS RAM during fault  
conditions. When the voltage at VDD drops below a  
preset threshold (VIT), the active low push-pull  
RESET output asserts, and VOUT switches from VDD  
to VBAT. When VDD rises above the trip threshold,  
Battery Supply Current of 100 nA (Max)  
Precision 5-V Supply Voltage Monitor, Other  
Voltage Options on Request  
•
•
•
Backup-Battery Voltage Can Exceed VDD  
Watchdog Timer With 800-ms Time-Out  
Power-On Reset Generator With Fixed 100-ms  
Reset Delay Time  
VOUT switches immediately from VBAT to VDD  
.
The RESET output remains low until the delay time  
(td) expires. During power on, RESET is asserted  
when the supply voltage (VDD or VBAT) goes higher  
than 1.1 V.  
•
Voltage Monitor for Power-Fail or Low-Battery  
Monitoring  
•
•
•
Battery Freshness Seal (TPS3617 Only)  
8-Pin MSOP Package  
The PFI and PFO pins are provided if additional  
voltage monitoring is needed. If the voltage at PFI is  
less than 1.15 V, the push-pull PFO pin will assert  
low. When the voltage at PFI exceeds the threshold  
voltage, PFO will go high.  
Temperature Range: -40°C to 85°C  
APPLICATIONS  
•
•
•
•
•
•
•
•
•
Fax Machines  
Set-Top Boxes  
Advanced Voice Mail Systems  
Portable Battery Powered Equipment  
Computer Equipment  
Advanced Modems  
Automotive Systems  
Portable Long-Time Monitoring Equipment  
Point-of-Sale Equipment  
These devices also feature a watchdog timer pin  
(WDI) that monitors processor activity and asserts  
RESET if the the processor is inactive longer than the  
watchdog timeout period. If the watchdog timer is not  
used, the WDI pin should be left floating.  
The TPS3617 and TPS3618 are available in an 8-pin  
MSOP package and are characterized for operation  
over a temperature range of -40°C to 85°C.  
Power  
Supply  
TPS3617  
TPS3618  
Microcontroller  
or  
Microprocessor  
MSOP (DGK) Package  
Backup  
Battery  
0.1 µF  
(TOP VIEW)  
V
V
BAT  
DD  
V
V
V
BAT  
RESET  
WDI  
OUT  
External  
Source  
DD  
GND  
PFI  
RESET  
I/O  
RESET  
WDI  
PFO  
R
R
x
PFI  
I/O  
PFO  
Switchover  
Capacitor  
y
ACTUAL SIZE  
3,05 mm x 4,98 mm  
V
OUT  
V
CC  
0.1 µF  
GND  
GND  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2000–2004, Texas Instruments Incorporated  
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