TPS3631-01 Datasheet, PDF (1/19 Pages) Texas Instruments – ADJUSTABLE BATTERY-BACKUP SUPERVISOR FOR RAM RETENTION

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TPS3613Ć01
SLVS340D − DECEMBER 2000 − REVISED JULY 2008
ADJUSTABLE BATTERYĆBACKUP SUPERVISOR
FOR RAM RETENTION
FEATURES
D Supply Current of 40 µA (Max)
D Battery Supply Current of 100 nA (Max)
D Supply Voltage Supervision Range:
− Adjustable
− Other Versions Available on Request
D Backup-Battery Voltage Can Exceed V_DD
D Power-On Reset Generator With Fixed 100-ms
Reset Delay Time
D Active-High and Active-Low Reset Output
D Chip-Enable Gating: 3 ns (at V_DD = 5 V) Max
Propagation Delay
D 10-Pin MSOP Package
D Temperature Range: −40°C to 85°C
APPLICATIONS
D Fax Machines
D Set-Top Boxes
D Advanced Voice Mail Systems
D Portable Battery-Powered Equipment
D Computer Equipment
D Advanced Modems
D Automotive Systems
D Portable Long-Time Monitoring Equipment
D Point-of-Sale Equipment
DESCRIPTION
The TPS3613-01 supervisory circuit monitors and controls
processor activity by providing backup-battery switchover
for data retention of CMOS RAM.
During power-on, reset (RESET and RESET) is asserted
when the supply voltage (V_DD or V_BAT) becomes higher
than 1.1 V.
Thereafter, the supply voltage supervisor monitors V_DD at
the SENSE pin through external feedback resistors and
keeps reset active as long as SENSE remains below the
threshold voltage, V_IT.
An internal timer delays the release of the reset state to
ensure proper system reset. The delay time starts after
SENSE rises above the threshold voltage, V_IT.
When SENSE drops below V_IT, reset becomes active
again.
The TPS3613-01 is available in a 10-pin MSOP package
and is characterized for operation over a temperature
range of −40°C to +85°C.
Power
Supply
0.1 µF
Address
Decoder
CEIN CEOUT Backup
Rx ^VDD
VBAT ^Battery
SENSE
Ry
RESET
TPS3613
Address Bus
uC
RESET
Data Bus
CE
CMOS
RAM
VCC
8
16
CE
CMOS
RAM
VCC
8
Real−
Time
Clock
VCC
Manual
Reset
MR
VOUT
GND
Switchover
Capacitor
0.1 µF
VCC
GND
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PRODUCTION DATA information is current as of publication date. Products
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