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TPS3610U18 Datasheet(PDF) 9 Page - Texas Instruments

Part # TPS3610U18
Description  BATTERY-BACKUP SUPERVISORS FOR RAM RETENTION
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS3610U18 Datasheet(HTML) 9 Page - Texas Instruments

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TPS3610U18, TPS3610T50
BATTERY BACKUP SUPERVISORS FOR RAM RETENTION
SLVS327B – DECEMBER 2000 – REVISED DECEMBER 2002
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description (continued)
backup-battery switchover
In case of a brownout or power failure, it may be necessary to preserve the contents of RAM. If a backup-battery
is installed at VBAT, the device automatically switches the connected RAM to backup power when VDD fails. In
order to allow the backup-battery (e.g., a 3.6-V lithium cell) to have a higher voltage than VDD, these supervisors
do not connect VBAT to VOUT when VBAT is greater than VDD. VBAT only connects to VOUT (through a 15-Ω switch)
when VDD falls below VIT and VBAT is greater than VDD. When VDD recovers, switchover is deferred either until
VDD crosses VBAT, or until VDD rises above the reset threshold VIT. VOUT connects to VDD through a 1-Ω (max)
PMOS switch when VDD crosses the reset threshold.
FUNCTION TABLE
VDD > VBAT
VDD > VIT
VOUT
1
1
VDD
1
0
VDD
0
1
VDD
0
0
VBAT
Undefined
VBSW Hysteresis
VBAT Mode
VDD Mode
VIT Hysteresis
VBAT – Backup-Battery Supply Voltage – V
Figure 4. Normal Supply Voltage vs Backup-Battery Supply Voltage


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